MICROBIAL SIGNATURES IN LACUSTRINE AND FLUVIAL CARBONATES - GONDWANA (PERMIAN) AND HOLOCENE EXAMPLES, INDIA

Authors
Citation
M. Mohanti et S. Das, MICROBIAL SIGNATURES IN LACUSTRINE AND FLUVIAL CARBONATES - GONDWANA (PERMIAN) AND HOLOCENE EXAMPLES, INDIA, Facies, 36, 1997, pp. 234-238
Citations number
NO
Categorie Soggetti
Geology,Paleontology
Journal title
FaciesACNP
ISSN journal
01729179
Volume
36
Year of publication
1997
Pages
234 - 238
Database
ISI
SICI code
0172-9179(1997)36:<234:MSILAF>2.0.ZU;2-4
Abstract
Laminated microbial carbonates occur in the siliciclastic sequence of the Talchir Formation (Lower Permian) of Gondwana basin, Orissa State, India. The microbial mat largely thrived in a lake-deltaic setting in near-shore, very shallow part of the lake and in peri-lacustrine swam ps and marginal fluvial regime, Petrographic and stable isotope studie s suggest periodic saline (marine?) groundwater input and evaporation under semi-arid condition. A nearby marine setting seems probable. Lat e Holocene microbial travertines-tufas (dominantly of stromatolitic cr usts) occur in parts of Orissa State and appear to be constructed of p ossible Phormidium, Scytonema, Schizothrix and diatoms. Stable isotope s suggest dominantly an inorganic precipitation from freshwater in flu vial regime of streams and small river.