TY - JOUR
T1 - Geochemical and Sm-Nd isotopic characteristics of the Late Archaean-Palaeoproterozoic Dhanjori and Chaibasa metasedimentary rocks, Singhbhum craton, E. India
T2 - Implications for provenance, and contemporary basin tectonics
AU - De, S.
AU - Mazumder, R.
AU - Ohta, T.
AU - Hegner, E.
AU - Yamada, K.
AU - Bhattacharyya, T.
AU - Chiarenzelli, J.
AU - Altermann, W.
AU - Arima, M.
N1 - Funding Information:
This paper forms part of SD's doctoral dissertation under the supervision of RM and TB. SD gratefully acknowledges infrastructural facilities provided by the Geological Studies Unit, Indian Statistical Institute Kolkata and the Department of Geology, Calcutta University. SD and RM are grateful to the Department of Science and Technology, Government of India for financial support in form of a research fellowship and major research grant respectively. We are grateful to three anonymous reviewers, C. Fedo and R. Parrish for their critical but very helpful and constructive comments.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - In significant contrast to other cratonic blocks of India, the Singhbhum cratonic successions record continuous depositional record from the Palaeoarchaean to Mesoproterozoic. Although the sedimentary facies characteristics and mode of stratigraphic sequence building of the Dhanjori and Chaibasa Formations are well known, sedimentary geochemistry, provenance and tectonic milieu of deposition of these two formations are hitherto unknown. The current manuscript presents geochemical and Sm-Nd isotopic data from the Dhanjori and Chaibasa Formations for the first time and combine previous sedimentological data with the goal to expand the framework for understanding the depositional and tectonic setting of these two formations. The Sm-Nd isotopic data for the Chaibasa clastics is unambiguous with respect to provenance. Average e{open}Nd (t=2.2Ga)=-0.8±1.0 and average Nd model age (TDM)=2.51±0.08Ga with average 147Sm/144Nd ratios=0.1114±0.0041 for phyllites and quartzites indicate an extremely homogeneous source signature consistent with a late Archaean "juvenile" crustal provenance, possibly a dominantly upper crustal provenance. The Sm-Nd isotopic data from the older Dhanjori Formation also indicate broadly similar provenance as comparable lithologies in the younger Chaibasa Formation. Our Sm-Nd isotopic data is entirely consistent with the previous sedimentological data and confirms a terrestrial, rift-dominated tectonic setting for the Dhanjori Formation (proximal sources, poorly mixed provenance) and a marginal marine to offshore setting for the more homogeneous Nd isotopic signature of the Chaibasa Formation (distal sources, well mixed provenance).
AB - In significant contrast to other cratonic blocks of India, the Singhbhum cratonic successions record continuous depositional record from the Palaeoarchaean to Mesoproterozoic. Although the sedimentary facies characteristics and mode of stratigraphic sequence building of the Dhanjori and Chaibasa Formations are well known, sedimentary geochemistry, provenance and tectonic milieu of deposition of these two formations are hitherto unknown. The current manuscript presents geochemical and Sm-Nd isotopic data from the Dhanjori and Chaibasa Formations for the first time and combine previous sedimentological data with the goal to expand the framework for understanding the depositional and tectonic setting of these two formations. The Sm-Nd isotopic data for the Chaibasa clastics is unambiguous with respect to provenance. Average e{open}Nd (t=2.2Ga)=-0.8±1.0 and average Nd model age (TDM)=2.51±0.08Ga with average 147Sm/144Nd ratios=0.1114±0.0041 for phyllites and quartzites indicate an extremely homogeneous source signature consistent with a late Archaean "juvenile" crustal provenance, possibly a dominantly upper crustal provenance. The Sm-Nd isotopic data from the older Dhanjori Formation also indicate broadly similar provenance as comparable lithologies in the younger Chaibasa Formation. Our Sm-Nd isotopic data is entirely consistent with the previous sedimentological data and confirms a terrestrial, rift-dominated tectonic setting for the Dhanjori Formation (proximal sources, poorly mixed provenance) and a marginal marine to offshore setting for the more homogeneous Nd isotopic signature of the Chaibasa Formation (distal sources, well mixed provenance).
KW - Palaeoclimate
KW - Palaeoproterozoic
KW - Provenance
KW - Sediment geochemistry
KW - Singhbhum
KW - Tectonics
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U2 - 10.1016/j.precamres.2014.10.020
DO - 10.1016/j.precamres.2014.10.020
M3 - Article
AN - SCOPUS:84910003727
VL - 256
SP - 62
EP - 78
JO - Precambrian Research
JF - Precambrian Research
SN - 0301-9268
ER -
