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Study of calc-silicate rocks of Hammer-Head Syncline from southern Sandmata Complex, northwestern India: implications on existence of an Archaean protolith

Purohit, R; Papineau, D; Mehta, P; Fogel, M; Dharma Rao, CV; (2015) Study of calc-silicate rocks of Hammer-Head Syncline from southern Sandmata Complex, northwestern India: implications on existence of an Archaean protolith. Journal of the Geological Society of India , 85 (2) pp. 215-231. 10.1007/s12594-015-0208-5.

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Abstract

Existence of an Archaean protolith is suggested in present study from an ensemble of rocks named as Sandmata Complex from northwestern India which have a debatable stratigraphic status of Archaean vs. Proterozoic. Rocks of the Sandmata Complex are represented by a highly metamorphosed volcano-sedimentary complex with multiple cycles of deformation. The manifold tectono-thermal events have obscured the pristine character of the protoliths. In this work we present geochemical features of calc-silicate protolith that show consistent Archaean affinity in the Hammer-Head Syncline (HHS) from southern part of the Sandmata Complex. Notable geochemical characteristics of calc-silicate metasediments in the HHS include high Th/U, high Cr concentrations, high La/Th, moderate La/Yb, and weak positive Eu anomaly. Carbon and oxygen stable isotope compositions of these carbonate metasediments vary between -3.0 and -0.3‰ (δ13Ccarb),- 11.6 and -35.0 (δ13Corg) and -19.1 and -13.4‰, (δ18O) respectively. These geochemical observations are in conjunction with the recently published Neoarchaean ages from the HHS and the proximal Hooke syncline.

Type: Article
Title: Study of calc-silicate rocks of Hammer-Head Syncline from southern Sandmata Complex, northwestern India: implications on existence of an Archaean protolith
DOI: 10.1007/s12594-015-0208-5
Publisher version: http://dx.doi.org/10.1007/s12594-015-0208-5
Language: English
Additional information: The final publication is available at Springer via http://dx.doi.org/10.1007%2Fs12594-015-0208-5.
Keywords: Sandmata Complex, Archaean Protolith, Petrology, Geochemistry
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1474751
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