NDLI: Organic-rich shale in the Palaeoproterozoic Kajrahat Formation, Vindhyan Supergroup, Son Valley: implications and genesis

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Organic-rich shale in the Palaeoproterozoic Kajrahat Formation, Vindhyan Supergroup, Son Valley: implications and genesis

Content Provider	Birbal Sahni Institute of Paleobotany
Author	Jeevankumar, S. Banerjee, S.
Abstract	The paper attempts to interpret the textural attributes of the shelf-originated, organic-rich shale unit of the Kajrahat Formation in the Proterozoic Vindhyan Supergroup. The black shales, alternating with thinly laminated dolomite beds exhibit many textural features, indirectly indicating microbial mat growth on muddy siliciclastics. The microbial mat features are subdivided broadly into three different categories related to growth, destruction and diagenesis of microbialmat. Wavy and crinkly laminated fabric is very characteristic of the shales, thin mud drapes imparting the wavy laminae conspicuous. Pyrite, formed because of anaerobic decay of microbial mat follows the carbonaceous laminae, rather than being disseminated. Cohesive behaviour of the shales is manifested by the folded and contorted nature of the carbonaceous laminae at places. Sticky nature of the microbial mats possibly generated the quartz-silt aggregates and abundant scattered quartz silts within the carbonaceous laminae. The black shale unit of the Kajrahat Formation, thus, appears to have microbial mat origin like many other contemporaneous black shales reported from Precambrian black shales. Theoccurrence of microbially originated, organic-rich shale suggests curtailment of siliciclastic supply.
Starting Page	7
Ending Page	14
File Format	PDF
Volume Number	57
Language	English
Publisher Date	2008-01-01
Access Restriction	Open
Subject Keyword	Microbial mat Organic-rich shale Wavy laminae Palaeoproterozoic Vindhyan Supergroup Son Valley
Content Type	Text
Educational Use	Research Reading
Resource Type	Article
Education Level	Under Graduate Post Graduate
Subject	Paleobotany; fossil microorganisms

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