NDLI: Two types of Archaean supracrustal belts in the Bundelkhand craton, India: Geology, geochemistry, age and implication for craton crustal evolution

Content Provider	Springer Nature Link
Author	Singh, Vinod K. Slabunov, Alexander
Copyright Year	2016
Abstract	Two Archaean supracrustal complexes are documented in the Bundelkhand craton viz. 1) the Central Bundelkhand greenstone complex (formed the Babina and Mauranipur belts), and 2) the Southern Bundelkhand metasedimentary (paragneisses, schists) complex (formed the Girar belt). The Central Bundelkhand greenstone complex consists of (i) an early assemblage composed of basic-ultrabasic, felsic volcanics, banded iron formation (BIF), and (ii) a late assemblage which contains felsic volcanics. The U-Pb zircon ages of felsic volcanics from the early assemblage, formed in an arc-type subduction setting, are 2813 Ma (Mesoarchaean). The U-Pb zircon ages of felsic volcanics from the late assemblage, which also occur in subduction settings as an active continental marginal type, are 2542 Ma (Neoarchaean). The Girar belt, located in the southern part of the craton, consists generally of metasedimentary rocks namely quartzites and BIFs. Quartzites are represented by fuchsite- and hematite- bearing quartz arenite and lesser quartz pebble conglomerates that have been subjected to low-grade metamorphism. BIF is represented by thinly-bedded quartz–hematite (±magnetite) rocks. Some lenses of marble and chlorite schist are present at the contact between the two formations. BIF is fairly rich in Cr and Ni, poor in Zr, Hf, Ba, Th, Sr, Yb and Lu, and displays a distinct positive Euanomaly (Eu/Eu* = 1.14-2.46). Zircons from quartzites give two U-Pb ages: 3432±9.7 Ma and 3252±6.4 Ma. The Sm-Nd isotope study of quartzite from the Girar belt shows that the T$_{DM}$ is 3.29 Ga. This T$_{DM}$ correlates well with the U-Pb ages of zircon and indicates that the continental crust in the Girar area began to form in the Paleoarchaean (3.4-3.2 Ga). The Central Bundelkhand greenstone complex was thus formed in a subduction-accretion setting in Mesoarchaean (ca 2.8 Ga) and Neoarchaean (2.54 Ga) time, and the Southern Bundelkhand metasedimentary complex originated in a sedimentary basin on the old continental crust apparently at ca ~ 2.7 Ga.
Starting Page	539
Ending Page	548
Page Count	10
File Format	PDF
ISSN	00167622
Journal	Journal of the Geological Society of India
Volume Number	88
Issue Number	5
e-ISSN	09746889
Language	English
Publisher	Geological Society of India
Publisher Date	2016-11-27
Publisher Place	Springer India
Access Restriction	Subscribed
Subject Keyword	Bundelkhand craton Archaean Greenstone belt Banded iron formation Zircon Crustal evolution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geology

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