ERRATA

for

Volume 147 of the Initial Reports of the Proceedings of the Ocean Drilling Program

After final pages had been printed for Vol. 147 of the Initial Reports of the ODPProceedings, the following error was found:

Section 3: CORESOn page 219, Core number 147-894G-19R-1:

The bottom 50 meters of the core photograph was not printed.If you would like a copy of the complete core photograph, please contact the ChiefProduction Editor of the Ocean Drilling Program.

PROCEEDINGSOF THE

OCEAN DRILLINGPROGRAM

VOLUME 147

INITIAL REPORTSHESS DEEP RIFT VALLEY

Covering Leg 147 of the cruises of the Drilling Vessel JOIDES Resolution,San Diego, California, to Balboa Harbor, Panama, Sites 894-895,

22 November 1992-21 January 1993

Kathryn M. Gillis, Catherine Mével, James F. Allan,Shoji Arai, Françoise Boudier, Bernard Célérier, Henry J.B. Dick,

Trevor J. Falloon, Qretchen Früh-Qreen, Qerardo J. Iturrino,Deborah S. Kelley, Paul Kelso, Lori A. Kennedy, Eiichi Kikawa,

Christophe M. Lecuyer, Christopher J. MacLeod, John Malpas, Craig E. Manning,Mark A. McDonald, D. Jay Miller, James Natland, Janet E. Pariso,

Rolf-Birger Pedersen Hazel M. Prichard, Harald Puchelt, Carl RichterShipboard Scientists

James F. AllanShipboard Staff Scientist

Prepared by theOCEAN DRILLING PROGRAM

TEXAS A&M UNIVERSITY

Jennifer A. Marin and Nancy K. McQuistionVolume Editors

in cooperation with theNATIONAL SCIENCE FOUNDATION

andJOINT OCEANOGRAPHIC INSTITUTIONS, INC.

This publication was prepared by the Ocean Drilling Program, Texas A&M University, as an accountof work performed under the international Ocean Drilling Program, which is managed by JointOceanographic Institutions, Inc., under contract with the National Science Foundation. Funding forthe program was provided by the following agencies at the time of this cruise:

Canada/Australia Consortium for the Ocean Drilling Program, Department of Energy, Mines andResources (Canada), and Department of Primary Industries and Energy (Australia)

Deutsche Forschungsgemeinschaft (Federal Republic of Germany)

European Science Foundation Consortium for Ocean Drilling (Belgium, Denmark, Finland, Iceland,Italy, Greece, The Netherlands, Norway, Spain, Sweden, Switzerland, and Turkey)

Institut Français de Recherche pour 1'Exploitation de la Mer (France)

National Science Foundation (United States)

Natural Environment Research Council (United Kingdom)

University of Tokyo, Ocean Research Institute (Japan)

Any opinions, findings, and conclusions or recommendations expressed in this publication are thoseof the author(s) and do not necessarily reflect the views of the National Science Foundation, theparticipating agencies, Joint Oceanographic Institutions, Inc., Texas A&M University, or Texas A&MResearch Foundation.

It is recommended that reference to the whole or to part of this volume be made in one of the followingforms, as appropriate:

Gillis, K., Mével, C , Allan, J., et al., 1993. Proc. ODP, Init. Repts., 147: College Station, TX (OceanDrilling Program).

Shipboard Scientific Party, 1993. Site 894. In Gillis, K., Mével, C , Allan, J., et al., 1993. Proc. ODP,Init. Repts., 147: College Station, TX (Ocean Drilling Program), 45-108.

Effective Publication Dates of ODP Proceedings

According to the International Code of Zoological Nomenclature, the date of publication of a workand of a contained name or statement affecting nomenclature is the date on which the publication wasmailed to subscribers, placed on sale, or when the whole edition is distributed free of charge, mailedto institutions and individuals to whom free copies are distributed. The mailing date, not the printeddate, is the correct one.

The mailing dates of recent Proceedings of the Ocean Drilling Program are as follows:

Volumes 142/143 (Initial Reports): April 1993Volume 144 (Initial Reports): July 1993Volume 145 (Initial Reports): July 1993Volume 130 (Scientific Results): April 1993Volume 131 (Scientific Results): April 1993Volumes 133/132 (Scientific Results): November 1993

Distribution

Copies of this publication may be obtained from Publications Distribution Center, Ocean DrillingProgram, 1000 Discovery Drive, College Station, Texas 77845-9547, U.S.A. Orders for copies willrequire advance payment. See current ODP publication list for price and availability of this publication.

Printed December 1993

ISSN 0884-5883Library of Congress 87-655-674

Printed in U.S.A. by Edwards Brothers Incorporated

The paper used in this publication meets the minimum requirements of American National Standard for InformationSciences-Permanence of Paper for Printed Library Materials, ANSI Z39.48-1984 ™

ForewordBy the National Science Foundation

The Ocean Drilling Program (ODP) is a major component of the National ScienceFoundation^ continuing commitment to the study of the geologic processes that have shapedour planet and modified its environment. The scientific problems being addressed range fromthe geologic history and structure of continental margins to the processes responsible for theformation and alteration of the ocean's crust. In a time of enhanced public and scientificinterest in problems of global change, ODP provides critical data on changes in oceancirculation, chemistry, and biologic productivity and their relation to changes in atmosphericcirculation and glacial conditions. The Ocean Drilling Program has a unique role in addressingthese problems, since it is the only facility for continuously sampling the geologic record ofthe ocean basins, which cover 70% of our planet.

The ODP is the successor to the Deep Sea Drilling Project (DSDP), which was a globalreconnaissance of the ocean basins. DSDP began operations in 1968 at Scripps Institution ofOceanography, using a 400-foot drillship, the Glomar Challenger. DSDP was supportedinitially by only the National Science Foundation, with extensive involvement of internationalscientists who were invited to participate on drilling cruises. As this international interestcontinued to grow in the early 1970's, formal participation in the project was offered to theinternational geoscience community. In 1975, five nations (France, the Federal Republic ofGermany, Japan, the United Kingdom, and the Soviet Union) accepted this commitment tojoint planning and conduct of the project, as well as to financial support for operations. ThisInternational Phase of Ocean Drilling (IPOD) continued to 1983. Although the Challengerhad reached the limits of her capabilities, the remarkable scientific success of the DSDP andthe new questions it had generated demanded a continuing capability for drilling in the oceans.

The Ocean Drilling Program was organized, international participation was coordinated, anew drillship (the JOIDES Resolution) was contracted and outfitted, and her first cruise sailedin early 1985, within 18 months of the retirement of the Challenger. This is a remarkableaccomplishment that reflects the efforts and excellence of the Joint Oceanographic Institu-tions, Inc. (prime contractor for ODP), Texas A&M University (science and ship operator),Lamont-Doherty Earth Observatory (logging operator), and the international science commu-nity in organizing and planning the new program. It was argued in planning for the ODP thata larger drillship was required to provide space for the increasing U.S. and internationaldemand for shipboard participation, improved and expanded laboratory capabilities, andimprovements in coring and logging systems. A larger and better equipped vessel would alsoprovide better stability and working conditions in high-latitude regions of the oceans. Thesuccess of the JOIDES Resolution has proven the wisdom of these early arguments.

ODP now has operated in all oceans except the ice-covered Arctic. We have drilled abovethe Arctic circle and within sight of the Antarctic continent. Over 1000 scientists from 25nations have participated in the initial ODP cruises. The larger scientific parties have allowedan increased emphasis on student participation and training aboard ship. The state-of-the-artlaboratories support rapid and complete initial analyses of samples that provide both scientificresults and guide subsequent shore-based studies. Nearly 1000 additional scientists have usedthese data and requested samples from the program's core and data archives for continuingstudy. The geochemical and geophysical logging capability is unsurpassed in either academiaor industry and has provided remarkable new data with which to study the Earth. Newexperiments to measure and monitor geologic processes have been deployed in ODP bore-holes.

The international commitment to ocean drilling has increased in the ODP. In addition toour four partners in IPOD—France, the Federal Republic of Germany, Japan, and the UnitedKingdom—two consortia have joined ODP: Canada-Australia and the European ScienceFoundation (representing Belgium, Denmark, Finland, Greece, Iceland, Italy, The Nether-lands, Norway, Spain, Sweden, Switzerland, and Turkey). The 19 countries of the ODPrepresent the community of nations that have a global interest in the geosciences andoceanography. This global scientific participation has assured the program's scientific excel-lence by focusing and integrating the combined scientific knowledge and capabilities of the

program's 19 nations. It has allowed problems of a global nature to be addressed by providingdatabases and background studies which are openly shared for planning and interpretingdrilling results. It has eased problems of access to territorial waters, allowing comparativestudies to be done among oceans. Finally, the international sharing of program costs hasallowed this important and large program to proceed without detrimental impact to theresearch budgets of any one nation.

The Ocean Drilling Program, like its predecessor, DSDP, serves as a model for planning,conducting, and financing research to address problems of global importance. The NationalScience Foundation is proud to have a leading role in this unique international program, andwe look forward to its continuing success.

JWalter E. MasseyDirectorNational Science Foundation

Washington, D.C.

ForewordBy Joint Oceanographic Institutions, Inc.

This volume presents scientific and engineering results from the Ocean Drilling Program(ODP). The papers presented here address the scientific and technical goals of the program,which include providing a global description of geological and geophysical structures includ-ing passive and active margins and sediment history, and studying in detail areas of majorgeophysical activity such as mid-ocean ridges and the associated hydrothermal circulations.

The Ocean Drilling Program, an international activity, operates a specially equippeddeep-sea drilling ship, the JOIDESResolution (Sedco/BP471), which contains state-of-the-artlaboratories, equipment, and computers. The ship is 471 feet (144 meters) long, is 70 feet (21meters) wide, and has a displacement of 18,600 short tons. Her derrick towers 211 feet (64meters) above the waterline, and a computer-controlled dynamic-positioning system stabilizesthe ship over a specific location while drilling in water depths up to 27,000 feet (8230 meters).The drilling system collects cores from beneath the seafloor with a derrick and drawworksthat can handle 30,000 feet (9144 meters) of drill pipe. More than 12,000 square feet (1115square meters) of space distributed throughout the ship is devoted to scientific laboratoriesand equipment. The ship sails with a scientific and technical crew of 51 and a ship's crew(including the drill crew) of 62. The size and ice-strengthening of the ship allow drilling inhigh seas and ice-infested areas as well as permitting a large group of multidisciplinaryscientists to interact as part of the scientific party.

Logging, or measurements in the drilled holes, is an important part of the program. ODPprovides a full suite of geochemical and geophysical measurements for every hole deeper than1300 feet (400 meters). For each such hole, there are lowerings of basic oil-industry tools:nuclear, sonic, and electrical. In addition, a borehole televiewer is available for imaging thewall of the hole, a 12-channel logging tool provides accurate velocity and elastic propertymeasurements as well as sonic waveforms for spectral analysis of energy propagation nearthe wall of the hole, and a vertical seismic profiler can record reflectors from below the totaldepth of the hole.

The management of the Ocean Drilling Program involves a partnership of scientists andgovernments. International oversight and coordination are provided by the ODP Council, agovernmental consultative body of the partner countries, which is chaired by a representativefrom the United States National Science Foundation. The ODP Council periodically reviewsthe general progress of the program and discusses financial plans and other managementissues. Overall scientific and management guidance is provided to the operators of the programby representatives from the group of institutions involved in the program, called the JointOceanographic Institutions for Deep Earth Sampling (JOIDES).

The Executive Committee (EXCOM), made up of the administrative heads of the JOIDESinstitutions, provides general oversight for ODP. The Planning Committee (PCOM), with itsadvisory structure, is made up of working scientists and provides scientific advice and detailedplanning. PCOM has a network of panels and working groups that screen drilling proposals,evaluate instrumentation and measurement techniques, and assess geophysical-survey dataand other safety and siting information. PCOM uses the recommendations of the panels andcommittees to select drilling targets, to specify the location and major scientific objectives ofeach two-month drilling segment or leg, and to provide the science operator with nominationsfor co-chief scientists.

Joint Oceanographic Institutions, Inc. (JOI), a nonprofit consortium of U.S. Oceanographicinstitutions, serves as the National Science Foundation^ prime contractor for ODP. JOI isresponsible for seeing that the scientific objectives, plans, and recommendations of theJOIDES committees are translated into scientific operations consistent with scientific adviceand budgetary constraints. JOI subcontracts the operations of the program to two universities:Texas A&M University and Lamont-Doherty Earth Observatory of Columbia University. JOIis also responsible for managing the U.S. contribution to ODP.

Texas A&M University (TAMU) serves as science operator for ODP. In this capacity,TAMU is responsible for planning the specific ship operations, actual drilling schedules, andfinal scientific rosters, which are developed in close cooperation with PCOM and the relevant

panels. The science operator also ensures that adequate scientific analyses are performed onthe cores by maintaining the shipboard scientific laboratories and computers and by providinglogistical and technical support for shipboard scientific teams. Onshore, TAMU managesscientific activities after each leg, is curator for the cores, distributes samples, and coordinatesthe editing and publication of scientific results.

Lamont-Doherty Earth Observatory (LDEO) of Columbia University is responsible for theprogram's logging operation, including processing the data and providing assistance toscientists for data analysis. The ODP Data Bank, a repository for geophysical data, is alsomanaged by LDEO.

Core samples from ODP and the previous Deep Sea Drilling Project are stored for futureinvestigation at three sites: ODP Pacific and Indian Ocean cores at TAMU, ODP and DSDPAtlantic and Antarctic cores at LDEO, and DSDP Pacific and Indian Ocean cores at the ScrippsInstitution of Oceanography.

Scientific achievements of ODP include new information on early seafloor spreading andhow continents separate and the margins evolve. The oldest Pacific crust has been drilled andsampled. We have new insights into glacial cycles and the fluctuations of ocean currentsthroughout geological time. Many of the scientific goals can be met only with new technology;thus the program has focused on engineering as well as science. To date, ODP engineers havedemonstrated the capability to drill on bare rock at mid-ocean-ridge sites and have developedtechniques for drilling in high-temperature and corrosive regions typical of hydrothermal ventareas. A new diamond coring system promises better core recovery in difficult areas.

In addition, ODP is cooperating closely with other geological and geophysical programs;for example, in 1991 the first hole was drilled by ODP for emplacement of a seismometer nearHawaii for the Ocean Seismic Network. JOI is pleased to have been able to play a facilitatingrole in the Ocean Drilling Program and its cooperative activities, and we are looking forwardto many new results to come.

D. James BakerPresidentJoint Oceanographic Institutions, Inc.

Washington, D.C.

OCEAN DRILLING PROGRAM

MEMBER ORGANIZATIONS OF THE JOINTOCEANOGRAPHIC INSTITUTIONS FORDEEP EARTH SAMPLING (JOIDES):University of California at San Diego, Scripps Institution

of Oceanography

Columbia University, Lamont-Doherty Earth Observatory

University of Hawaii, School of Ocean and Earth Scienceand Technology

University of Miami, Rosenstiel School of Marine andAtmospheric Science

Oregon State University, College of Oceanography

University of Rhode Island, Graduate School ofOceanography

Texas A&M University, College of Geosciences andMaritime Studies

University of Texas at Austin, Institute for Geophysics

University of Washington, College of Ocean and FisherySciences

Woods Hole Oceanographic Institution

Canada/Australia Consortium for the Ocean DrillingProgram, Department of Energy, Mines and Resources(Canada), and Department of Primary Industries andEnergy (Australia)

European Science Foundation Consortium for OceanDrilling, Belgium, Denmark, Finland, Iceland, Italy,Greece, The Netherlands, Norway, Spain, Sweden,Switzerland, and Turkey

Federal Republic of Germany, Bundesanstalt fürGeowissenschaften und Rohstoffe

France, Institut Français de Recherche pour 1'Exploitationde la Mer

Japan, University of Tokyo, Ocean Research Institute

United Kingdom, Natural Environment Research Council

PRIME CONTRACTORJoint Oceanographic Institutions, Inc.Washington, D.C.

Thomas E. PyleDirector, Ocean Drilling Programs

OPERATING INSTITUTIONCollege of Geosciences and Maritime StudiesTexas A&M UniversityCollege Station, Texas

Robert A. DuceDean

OCEAN DRILLING PROGRAMPhilip D. Rabinowitz

Director

Timothy J.G. FrancisDeputy Director

Richard G. McPhersonAdministrator

Jack G. Baldauf, ManagerScience Operations

Barry W. Harding, ManagerEngineering and Drilling Operations

Russell B. Merrill, Curator and ManagerScience Services

Robert E. Olivas, ManagerTechnical and Logistics Support

John C. Coyne, ManagerInformation Services

LOGGING OPERATORBorehole Research GroupLamont-Doherty Earth ObservatoryColumbia UniversityPalisades, New York

David Goldberg, Head

PARTICIPANTS ABOARD THE JOIDES RESOLUTION FOR LEG 147*

Kathryn M. GillisCo-Chief Scientist

Department of Geology and GeophysicsWoods Hole Oceanographic InstitutionQuissett CampusWoods Hole, Massachusetts 02543U.SA.

Catherine MévelCo-Chief Scientist

Laboratoire de PétrologieCNRS URA736Université Pierre et Marie Curie4, Place Jussieu75252 Paris Cedex 05France

James F. AllanODP Staff Scientist

Ocean Drilling ProgramTexas A&M University Research Park1000 Discovery DriveCollege Station, Texas 77845-9547U.S.A.

Shoji AraiIgneous Petrologist

Department of Earth SciencesKanazawa UniversityKanazawa 920-11IshikawaJapan

Françoise BoudierStructural Petrologist

Laboratoire de TectonophysiqueUniversité Montpellier IIPlace Eugene BataillonF-34095 Montpellier Cedex 5France

Bernard CélérierLDEO Logging Scientist

Laboratoire de Tectonique et GéochronologieUniversité de Montpellier IICase courrier 58F-34095 Montpellier Cedex 5France

Henry J.B. DickIgneous Petrologist

Department of Geology and GeophysicsWoods Hole Oceanographic InstitutionQuissett CampusWoods Hole, Massachusetts 02543U.SA.

Trevor J. FalloonIgneous Petrologist

Department of GeologyUniversity of BristolWills Memorial BuildingQueen's RoadBristol BS81RJUnited Kingdom

Gretchen Früh-GreenMetamorphic Petrologist

Institut für Mineralogie und PetrographieEidgenössische Technische HochschuleSonneggstrasse 5CH-8092 ZurichSwitzerland

Gerardo J. IturrinoPhysical Properties Specialist

Division of Marine Geology and GeophysicsRosenstiel School of Marine and Atmospheric ScienceUniversity of Miami4600 Rickenbacker CausewayMiami, Florida 33149-1098U.SA.

Deborah S. KelleyMetamorphic Petrologist

School of Oceanography, WB-10University of WashingtonSeattle, Washington 98195U.SA.

Paul KelsoPaleomagnetist

Institute for Rock Magnetism293 Shepard Laboratories100 Union Street S.E.Minneapolis, Minnesota 55455-0128U.SA.

Lori A. KennedyStructural Petrologist

Center for TectonophysicsTexas A&M UniversityCollege Station, Texas 77843U.SA.

Eiichi KikawaPaleomagnetist

Department of Marine GeologyGeological Survey of Japan1-1-3 HigashiTsukuba,Ibaraki 305Japan

* Addresses at time of cruise.

Christophe M. LecuyerMetamoΦhic Petrologist

Laboratoire de Géochimie IsotopiqueCNRS UPR4661Geosciences RennesUniversité de Rennes 1Campus de BeaulieuF-35042 RennesFrance

Christopher J. MacLeodStructural Geologist/JOIDES Logging Scientist

Institute of Oceanographic SciencesBrook RoadWormley, GodalmingSurrey GU8 5UBUnited Kingdom

John MalpasIgneous Petrologist

Centre for Earth Resources ResearchMemorial UniversitySt. John's, Newfoundland AlB 3X5Canada

Craig E. ManningMetamorphic Petrologist

Department of Earth and Space SciencesUniversity of California, Los AngelesLos Angeles, California 90024-1567U.S.A.

Mark A. McDonaldPhysical Properties/Geophysics Specialist

Scripps Institution of Oceanography, 0205University of California, San DiegoLa Jolla, California 92093U.SA.

D. Jay MillerIgneous Petrologist

Department of Earth and Atmospheric SciencesPurdue UniversityWest Lafayette, Indiana 47907-1397USA.

James NatlandIgneous Petrologist

Division of Marine Geology and GeophysicsRosenstiel School of Marine and Atmospheric ScienceUniversity of Miami4600 Rickenbacker CausewayMiami, Florida 33149-1098USA.

Janet E. ParisoPaleomagnetist

School of Oceanography, WB-10University of WashingtonSeattle, Washington 98195U.SA.

Rolf-Birger PedersenIgneous Petrologist

Geologisk InstituttUniversitetet i BergenAllegaten 41N-5007 BergenNorway

Hazel M. PrichardIgneous Petrologist

Department of Earth SciencesThe Open UniversityWalton HallMilton Keynes, MK7 6AAUnited Kingdom

Harald PucheltIgneous Petrologist

Institut ßr Petrographie und Geochemieder Universitàt Karlsruhe

Kaiserstrasse 12D-7500 Karlsruhe 1Federal Republic of Germany

Carl RichterPaleomagnetist/Structural Geologist

Department of Geological SciencesUniversity of Michigan1006 C.C. Little BuildingAnn Arbor, Michigan 48109-1063U.SA.

SEDCO OFFICIALS

Captain Edwin G. OonkMaster of the Drilling Vessel

Overseas Drilling Ltd.SEDCO Forex707 Texas Avenue South, Suite 103DCollege Station, Texas 77840-1917USA.

Kenneth D. HorneDrilling Superintendent

Overseas Drilling Ltd.SEDCO Forex707 Texas Avenue South, Suite 103DCollege Station, Texas 77840-1917USA.

ODP ENGINEERING AND OPERATIONS PERSONNEL

Eugene Pollard Operations SuperintendentMichael A. Storms Development Engineer

ODP TECHNICAL AND LOGISTICS PERSONNEL

Roger Ball Marine Electronics and Downhole Tools SpecialistBarry Cochran Marine Laboratory Specialist/PhotographyMary Ann Cusimano Marine Laboratory Specialist/X-rayEdwin Garrett Marine Computer Specialist/System ManagerTed ("Gus") Gustafson Marine Laboratory Specialist/Thin SectionBurney W. Hamlin Laboratory OfficerMichiko Hitchcox Marine Laboratory Specialist/YeopersonJoel Huddleston Marine Computer Specialist/System ManagerRobert Kemp Marine Laboratory Specialist/Underway GeophysicsJean Mahoney Marine Laboratory Specialist/Physical PropertiesEric Meissner Marine Electronics and Downhole Tools SpecialistClaudia Muller Marine Laboratory SpecialistChieh Peng Marine Laboratory Specialist/ChemistryPhilip Rumford Marine Laboratory Specialist/ChemistryDon Sims Senior Marine Laboratory SpecialistLorraine Southey Marine Laboratory Specialist/Curatorial RepresentativeMonica Sweitzer Marine Laboratory Specialist/Paleomagnetics

Ocean Drilling Program Publications Staff

Publications SupervisorWilliam D. Rose

Chief Editor

Ann Klaus

EditorsChryseis 0 . FoxEva M. MaddoxJennifer A. MarinNancy K. McQuistionSondra K. Stewart

Chief Production EditorJennifer Pattison Hall

Production EditorsJill K. ButlerMauri L. CoulterJaime A. Gracia (this volume)

Senior Publications CoordinatorJanalisa Braziel Soltis

Publications CoordinatorGudelia ("Gigi") Delgado

Publications Distribution SpecialistFabiola Munoz Byrne

Data Entry/Copier OperatorAnn Mitchell

Senior PhotographerJohn W. Beck

PhotographerBarry C. Cochran

Chief IllustratorDeborah L. Partain

IllustratorsMelany R. BorsackMichelle CadyMichelle CurtisGarnet D. GaitherT '—J.-, f~^ t~\ ri'

Linda C. Orsi

Production AssistantsCarrie R. CastillónMary Elizabeth MitchellAlexandra F. Moreno

TABLE OF CONTENTS

VOLUME 147—INITIAL REPORTS

Acknowledgments 1

SECTION 1: INTRODUCTION

1. Introduction and Principal Results 5

C. Mével, K. Gillis, and Shipboard Scientific Party

2. Explanatory Notes 15Shipboard Scientific Party

SECTION 2: SITE CHAPTERS

3. Site 894 45Shipboard Scientific Party

Principal results 46

Operations 47

Sediments 53

Petrography of Holes 894A-894E 55

Igneous Petrography of Holes 894F and 894G 56

Metamorphism 68

Structure 79

Geochemistry 88

Paleomagnetism 90

Physical Properties 98

Downhole Measurements 102

References 105

4. Site 895 109

Shipboard Scientific Party

Principal results 110

Operations I l l

Sediments 113

Igneous Petrology 114

Metamorphism 128

Structure 138

Geochemistry 143

Paleomagnetism 144

Physical Properties 150

References 157

SECTION 3: CORESCore descriptions and core photographs for:

Site 894 163

Site 895 225

SECTION 4: THIN SECTIONSThin-section descriptions for:

Site 894 309

Site 895 347

(For ODP Sample-Distribution Policy, please see ODP Proceedings, Initial Reports, Volume 145, pp. 1039-1040)

CD-ROM (in back pocket)Well-log data

Structure

The CD-ROM in the back of this volume is a "data-only" CD-ROM, containing depth-shifted andprocessed logging data collected during Legs 147, 148, and 140. Both processing and CD-ROMproduction were conducted by the Borehole Research Group at Lamont-Doherty Earth Observatory,Wireline Logging Operator for ODP.

The CD-ROM is structured as follows:GENERAL INFORMATION directory

Format documentation fileINDEX file (contents)Software documentation file

LOG DATA directoryREADME fileHOLE # subdirectory

Conventional logs subdirectoryIndividual tool data files

General information subdirectoryAcronyms and units fileProcessing history of log data fileProcessing history of FMS data file

FMS subdirectoryDIPASCII subdirectory

Dipmeter files in ASCII formatFMS images in PBM (portable bit map—8-bit binary) format subdirectory

Information about processing file1:1 ratio image raster files (every 10 m) subdirectory

Data filesRaster documentation file

1:10 ratio image raster files (every 100 m) subdirectoryData filesRaster documentation file

Temperature data subdirectoryTemperature data in ASCII format file

VSP data subdirectoryInternal velocity data in ASCII format file

CORE DATA directoryREADME documentSITE # subdirectory

GRAPE documentation fileMagnetic susceptibility documentation fileIndex properties documentation fileHOLE # subdirectory

GRAPE data fileMAGSUS data fileIndex properties data file

The preceding structure is identical in each hole.

The INDEX file contains a summary of all the files loaded on the CD-ROM.

The software documentation file in the GENERAL INFORMATION directory contains informationabout which software packages work best to import PBM (portable bit map—8-bit binary) raster files.It also includes network sources for the graphics software and data compression information. TheREADME file gives information on whom to contact with any questions about the production of or dataon the CD-ROM.

All of the ASCII files (basic log, dipmeter, GRAPE, index, and magnetic susceptibility files) are TABdelimited for compatibility with most spreadsheet and database programs. Holes that have more thanone logging pass with the same tools are labeled Pass 1, Pass 2, etc. Holes that have long logging runsare often divided into TOP, MIDDLE, and BOTTOM sections. This is noted by adding "top," "mid," or"bot" to the data file names where space permits or a "t," "m," or "b" where there is room for only onecharacter.

In the FMS-PBM format subdirectory there are two subdirectories, 1:1 ratio with maximum 10-m-longimage raster files and 1:10 ratio with maximum 100-m-long image raster files. The image raster files arenamed according to their depth interval. The raster documentation files contain image file parameterinformation necessary for use with most graphic software packages.

Summary of Leg 147 Log DataHole 894G:

Conventional logsFMS data

Summary of ODP Core DataSite 894:

Hole F:Index property data

Hole G:GRAPE dataIndex property dataMAGSUS data

Site 895:Hole B:

Index property dataMAGSUS data

Hole C:Index property dataMAGSUS data

Hole D:Index property dataMAGSUS data

Hole E:Index property dataMAGSUS data

Hole F:MAGSUS data

AppendixesAppendix A: Grain size spreadsheetAppendix B: Metamorphic mineral spreadsheetAppendix C: Vein spreadsheetAppendix D: Structural spreadsheet

ACKNOWLEDGMENTS

The scientific party of Leg 147 wishes to thank Captain Ed Oonk, the entire crewof the JOIDES Resolution (SEDCOIBP 471), and the Ocean Drilling Program (ODP)staff for making the tri-holiday cruise memorable. We would like to thank OperationsSuperintendent Eugene Pollard, Special Engineer Michael Storms, Drilling Superin-tendent Ken Horne, and the rig-floor crew for successfully pioneering the offsetdrilling strategy in an extremely challenging terrain.

The ODP technical staff, led by Burney Hamlin, provided crucial support through-out a difficult leg. The cores recovered during Leg 147 represent the first sections ofthe lower crust and shallow mantle associated with a fast-spreading ridge. Theexcitement of the scientific party toward these rocks peaked during our samplingparties as our curator bravely negotiated the pillaging of the cores.

We acknowledge with thanks Jean Francheteau and the scientific party of theNautile cruise NAZCOPAC for providing the geological observations on which thisdrilling leg was based. SeaBeam maps of the Hess Deep region were provided byHarald Puchelt, LeRoy Dorman, and Peter Lonsdale. Discussions with JeanFrancheteau, Roger Hekinian, LeRoy Dorman, John Hildebrand, Sean Wiggins, andPeter Lonsdale contributed greatly to our planning.