Circa 1.7 Ga Rb - Sr Re - Setting in Two Huronian Paleosols, Elliot Lake, Ontario and Ville Marie, Quebec

Roscoe, S M; Thériault, R. J.; Prasad, N

doi:10.4095/134171

Cited by 5 publications

(1 citation statement)

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“…Potassium was enriched in GJ samples compared to DP samples. Elevated K concentrations are common in ancient sediments as compared to the modern sediments (Roscoe et al, 1992) and can indicate that the weathering profiles had a provenance enriched in K derived from granitoids. In the present case, it may suggest that the carbonates of the GJ series in the HHS had a proximal provenance and/or may be authigenic carbonates.…”

Section: Discussionmentioning

confidence: 99%

Study of Calc-Silicate Rocks of Hammer-Head Syncline from Southern Sandmata Complex, Northwestern India: Implications on Existence of an Archaean Protolith

Purohit¹,

Papineau

Mehta³

et al. 2015

Journal of the Geological Society of India

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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‰ (δ 13 C carb ),-11.6 and -35.0 (δ 13 C org ) and -19.1 and -13.4‰, (δ 18 O) respectively. These geochemical observations are in conjunction with the recently published Neoarchaean ages from the HHS and the proximal Hooke syncline.

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Section: Discussionmentioning

confidence: 99%