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.
Text
Purohit_et_al_2015_JGeolSocIndia_Hammer_syncline_carbonate.pdf - Published Version Access restricted to UCL open access staff Download (999kB) |
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 |
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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 UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/1474751 |
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