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Microbial mat-induced sedimentary structures in siliciclastic sediments: Examples from the 1.6Ga Chorhat Sandstone, Vindhyan Supergroup, MP, India

DSpace at IIT Bombay

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Title Microbial mat-induced sedimentary structures in siliciclastic sediments: Examples from the 1.6Ga Chorhat Sandstone, Vindhyan Supergroup, MP, India
 
Creator SARKAR, S
BANERJEE, S
SAMANTA, P
JEEVANKUMAR, S
 
Subject south-africa
wrinkle structures
koldaha shale
evolution
deposits
sand
transition
dynamics
animals
life
microbial mat
proterozoic
siliciclastics
mat-induced structures
1.6 ga-old chorhat sandstone
 
Description This paper addresses macroscopic signatures of microbial mat-related structures within the 1.6 Ga-old Chorhat Sandstone of the Semri Group - the basal stratigraphic unit of the Vindhyan succession in Son valley. The Chorhat Sandstone broadly represents a prograding succession of three depositional facies ranging from shallow shelf to coastal margin with aeolian sandsheet. The mat-mediated structures were generated because of plastic or brittle deformation of sand, turned cohesive and even thixotropic because of microbial mat growth. Mat growth also favoured abundant preservation of structures that usually have low preservation potential. Prolific growth of microbial mat in the subtidal to intertidal zone of the Chorhat sea was facilitated due to lack of grazing and burrowing activities of organisms in the Precambrian. It further indicates low rate of sedimentation between the storms, as also attested by frequent superposition of storm-beds, even near the storm wave base. It also reduces erosion and that, in turn, would imply low sediment concentration in flows leading to development of bedforms that are likely to be smaller in size and isolated from each other in a single train in contrast to those that form in mat-free sands.
 
Publisher INDIAN ACADEMY SCIENCES
 
Date 2011-08-02T04:49:31Z
2011-12-26T12:53:42Z
2011-12-27T05:40:37Z
2011-08-02T04:49:31Z
2011-12-26T12:53:42Z
2011-12-27T05:40:37Z
2006
 
Type Article
 
Identifier JOURNAL OF EARTH SYSTEM SCIENCE, 115(1), 49-60
0253-4126
http://dx.doi.org/10.1007/BF02703025
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8665
http://hdl.handle.net/10054/8665
 
Language en