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Limestone xenolith in Siddanpalli Kimberlite, Gadwal granite-greenstone terrain, eastern Dharwar Craton, southern India; remnant of Proterozoic platformal cover sequence of Bhima/Kurnool age?

A. Dongre, N. V. Chalapathi Rao and G. Kamde
Limestone xenolith in Siddanpalli Kimberlite, Gadwal granite-greenstone terrain, eastern Dharwar Craton, southern India; remnant of Proterozoic platformal cover sequence of Bhima/Kurnool age?
Journal of Geology (March 2008) 116 (2): 184-191

Abstract

We report an interesting occurrence of a limestone xenolith in the Siddanpalli kimberlite that intrudes the Gadwal granite-greenstone terrain, Eastern Dharwar craton, southern India. The xenolith is unmetamorphosed, is extremely fine grained (micritic), and displays laminations characteristic of sedimentary carbonate rocks. Its mineralogy, major- and trace-element (including rare earth element) geochemistry, and stable isotopes (C and O) are also consistent with a sedimentary origin. However, no sedimentary rocks have ever been found in the immediate vicinity of the Siddanpalli kimberlite field. The Bhima and Kurnool basins that are widely considered to be homotaxial, having a terminal Neoproterozoic age, based on fossil evidences and lithostratigraphic correlation, are the closest ( approximately 50 km) known sedimentary rocks containing similar carbonate lithounits. Therefore, the Siddanpalli carbonate xenolith is inferred to be their preserved remnant. This implies that (i) the platformal sediments of the Bhima/Kurnool basins extended at least up to the Siddanpalli kimberlite cluster; (ii) these two basins were possibly interconnected at the time of kimberlite eruption; and (iii) in contrast to present consensus favoring a terminal Neoproterozoic age for the two basins, the carbonate xenolith and its source unit is of at least late Mesoproterozoic age because the kimberlite emplacement was at 1090 Ma. A recent proposal for an adjustment of approximately 500 Ma in the age of the "Neoproterozoic" Chattisgarh basin, elsewhere in central India, which was also long considered to be homotaxial with Kurnool/Bhima basins, finds support from our study in that many of the Proterozoic (Purana) sedimentary basins of peninsular India could be, in fact, not younger than the Mesoproterozoic.


ISSN: 0022-1376
EISSN: 1537-5269
Coden: JGEOAZ
Serial Title: Journal of Geology
Serial Volume: 116
Serial Issue: 2
Title: Limestone xenolith in Siddanpalli Kimberlite, Gadwal granite-greenstone terrain, eastern Dharwar Craton, southern India; remnant of Proterozoic platformal cover sequence of Bhima/Kurnool age?
Affiliation: Government Institute of Science, Postgraduate Department of Geology, Aurangabad, India
Pages: 184-191
Published: 200803
Text Language: English
Publisher: University of Chicago Press, Chicago, IL, United States
References: 37
Accession Number: 2008-071996
Categories: StratigraphyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N15°00'00" - N16°00'00", E76°30'00" - E78°00'00"
Secondary Affiliation: Banaras Hindu University, IND, IndiaRashtrasant Tukadoji Maharaj University, IND, India
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute.
Update Code: 200819
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