geology of san juan mountains by rob blair ......san juan mountains • extraordinary geologic...
TRANSCRIPT
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GEOLOGY OF SAN JUAN MOUNTAINSBy Rob Blair
Mountain Studies Institute
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INTRODUCTION
• Overview of geologic history• Key geomorphic features and processes• Why the San Juan Mountains are
geologically interesting
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USGS image
ColoradoPlateau
SouthernRocky Mountains
Great Plains
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Telluride
Durango
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Photo by Peter Runyon, from Mountain Sights Inc.
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C (volcanic)
C
M
M
PPC
Modified from USGS image
Durango
Silverton
Pagosa Springs
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PRECAMBRIAN
• t: 540-1,800 Ma• p: granite, diorite, gabbro, gneiss, quartzite,
slate• r: island arc, coastal plain, marine• cl: hot, CO2 , CH4 , H2 0, N2 , NH3 and later
cooler, N2 , Ar, O2 , CO2 , H2 O• o: evolution of procaryotes (bacteria) and
later eucaryotes
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Image by R. Blakey, NAU
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Ouray UnconformityPhoto by R. Blair
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PALEOZOIC
• t: 250-540 Ma• p: shale, limestone, sandstone,
conglomerate• r: coastal, plains, lowlands, mountains• cl: maritime to warm & dry, cool alpine• o: bacteria dominant, fish, brachiopods,
reptiles, ferns and other woody plants
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Image by R. Blakey, NAU
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Hermosa CliffsUSGS photo
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MESOZOIC
• t: 66-250 Ma, Triassic, Jurassic, Cretaceous • p: eolian and coastal sandstones, marine
shale, coal• r: interior lowlands and seaways• cl: hot and dry to hot and humid• o: bacteria dominant, evolution of
dinosaurs, early mammals, flowering plants
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Image by R. Blakey, NAU
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Mesa VerdePhoto by R. Blair
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CENOZOIC
• t: 66 Ma to present, Tertiary, Quaternary• p: sandstones, conglomerates, volcanic
rocks• r: floodplains, mountains• cl: Mediterranean to glacial environments• o: bacteria dominant, age of mammals,
evolution of grass
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Image by R. Blakey, NAU
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John Wiley & Sons, Inc., 1995
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Mount St. HelensCopyright Pevear/ Easterbrook
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Crater Lake, ORPhoto by J. Sheldon
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USGS image
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OphirPhoto by R. Blair
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Red Mountain 1 & 2, Ironton ParkPhoto by R. Blair
Au, Ag, Zn, Cu, Fe
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ENERGYRESOURCES
-Geothermal-Uranium-Coal-Oil-Natural gas-Coalbed methane-Helium-Carbon dioxide
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After Atwood & Mather, 1932
Mineral Creek and Bear Mountain
East GreenlandPhoto by Peter Knight
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SilvertonPhoto by R. Blair
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nt Sneffleso by R. Blair
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SAN JUAN MOUNTAINS
• Extraordinary geologic record (PC-Holocene)• Repository of Au, Ag, Zn, Cu, Fe• Outliers of coal, oil, natural gas, U, He, CO2
• Geothermal resources • Extensive glacial history• Outstanding scenery
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