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Recycled detrital quartz grains are sedimentary rock fragments indicating unconformities; examples from the Chhattisgarh Supergroup, Bastar Craton, India

Abhijit Basu, Juergen Schieber, Sarbani Patranabis-Deb and Pratap Chandra Dhang
Recycled detrital quartz grains are sedimentary rock fragments indicating unconformities; examples from the Chhattisgarh Supergroup, Bastar Craton, India
Journal of Sedimentary Research (April 2013) 83 (4): 368-376

Abstract

Recycled detrital quartz grains are unequivocally identified if there are overgrowths on abraded overgrowths. We argue that the presence of such recycled grains even in small quantities in successions of quartz arenites indicates derivation from one or more sedimentary units from below an intrabasinal unconformity or an extrabasinal unroofing surface, as do detritus from characteristic rock fragments in polymict clastic rocks. In fact, detrital grains with inherited overgrowths are sedimentary rock fragments. We apply this petrographic criterion to evaluate the presumed unconformities that bound the Singhora, Chandarpur, Raipur, and the Kharsiya groups of the essentially Mesoproterozoic Chhattisgarh Supergroup in the Bastar craton - a critical Ur-craton vis a vis Columbia and Rodinia. Optical examination of about 6000 grains in 12 thin sections reveal few recycled quartz grains in sandstone samples of the Chandarpur Group but about 4% recycled quartz grains with inherited abraded overgrowths in a sandstone unit of the Raipur Group. Characteristic rock fragments from a tuffaceous unit at the top of the Raipur Group are found in the basal sandstone of the Kharsyia Group. The data indicate that the presumed unconformities below the Kharsyia Group and the Raipur Group are real but the one above the Singhora Group cannot be confirmed on the basis of recycled grains. Published age spectra of detrital zircons from these sandstones are compatible with the above inferences drawn from detrital-quartz and rock-fragment petrography.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 83
Serial Issue: 4
Title: Recycled detrital quartz grains are sedimentary rock fragments indicating unconformities; examples from the Chhattisgarh Supergroup, Bastar Craton, India
Affiliation: Indiana University, Department of Geological Sciences, Bloomington, IN, United States
Pages: 368-376
Published: 201304
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 64
Accession Number: 2013-041397
Categories: Sedimentary petrologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N21°18'00" - N21°18'00", E83°10'60" - E83°10'60"
Secondary Affiliation: Indian Statistical Institute, IND, India
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201326
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