Late Paleozoic Foraminifers and Carbonate Petrography in Central Lao PDR: A Preliminary report

Thasinee Charoentitirat*, Sarawute Chantraprasert and Patcharaporn Champasa

*Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330 THAILAND

Lao-Thai Conference @Vientiane, Lao PDR 17-18 January 2013

Abstr. p.72

- Fossil Foraminifers in the area

will provide biostratigraphic

control for structural

interpretation.

- Petrography of the carbonate

samples will enable

classification of sedimentary

facies and interpretation of

palaeo-depositional

environment.

Rationale

C-P1 km

C1 bp

Sample locations

Fossils

Carbonate Petrology Structure interpretation

Khammouan Formation

“Khammouan Limestone” forms the core of a NW-SE trending anticlinal structure flanked by non-marine Mesozoic strata

Mississippian Foraminifers

Pennsylvanian Fusulinids

Early Permian fusulinids

KM1

KM45

KM30

KM46 Ooid shoal

KM35

KM11 KM24

Carbonates were accumulated on a

huge carbonate platform of shallow-

marine conditions with different sub-

environments

: very shallow marine in high-energy

settings or ooid shoals

: open marine and platform interior environment.

- More information data on biochronological significance:

Mississippian, Pennsylvanian and Early Permian.

- Orientation data and biochronological data obtained in this study

led to the interpretation of additional reverse faults.

- Depositional environment: huge carbonate platform of shallow-marine conditions with different sub-environments.

Conclusions