Raza, M.; Casshyap, S.M.; Khan, A. (2002) Geochemistry of Mesoproterozoic Lower Vindhyan Shales from Chittaurgarh, Southeastern Rajasthan and its Bearing on Source Rock Composition, Palaeoweathering Conditions and Tectono-sedimentary Environments. Journal of the Geological Society of India, 60 (5). 505-518 doi:10.17491/jgsi/2002/600503
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Geochemistry of Mesoproterozoic Lower Vindhyan Shales from Chittaurgarh, Southeastern Rajasthan and its Bearing on Source Rock Composition, Palaeoweathering Conditions and Tectono-sedimentary Environments | ||
| Journal | Journal of the Geological Society of India | ||
| Authors | Raza, M. | Author | |
| Casshyap, S.M. | Author | ||
| Khan, A. | Author | ||
| Year | 2002 (November 1) | Volume | 60 |
| Page(s) | 505-518 | Issue | 5 |
| Publisher | Geological Society of India | Place | Bangaluru, India |
| URL | |||
| DOI | doi:10.17491/jgsi/2002/600503Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 19392380 | Long-form Identifier | mindat:1:5:19392380:7 |
| GUID | 0 | ||
| Full Reference | Raza, M.; Casshyap, S.M.; Khan, A. (2002) Geochemistry of Mesoproterozoic Lower Vindhyan Shales from Chittaurgarh, Southeastern Rajasthan and its Bearing on Source Rock Composition, Palaeoweathering Conditions and Tectono-sedimentary Environments. Journal of the Geological Society of India, 60 (5). 505-518 doi:10.17491/jgsi/2002/600503 | ||
| Plain Text | Raza, M.; Casshyap, S.M.; Khan, A. (2002) Geochemistry of Mesoproterozoic Lower Vindhyan Shales from Chittaurgarh, Southeastern Rajasthan and its Bearing on Source Rock Composition, Palaeoweathering Conditions and Tectono-sedimentary Environments. Journal of the Geological Society of India, 60 (5). 505-518 doi:10.17491/jgsi/2002/600503 | ||
| In | (2002, November) Journal of the Geological Society of India Vol. 60 (5). Geological Society of India | ||
| Abstract/Notes | Abstract: The western margin of the Vindhyan Basin of north Indian shield, is characterized by well developed Mesoproterozoic Lower Vindhyan succession. It contains thick units of shales and sandstone with minor conglomerate and limestone at different stratigraphic levels. Five shale units, namely Khardcola Shale (KHS), Palri Shale (PRS), Binota Shale (BNS), Bari Shale (BRS) and Suket Shale (SKS) occurring in chronological order, have been examined for their geochemistry to determine the composition of their source rocks, to understand the environments of weathering and sedimentation and the tectonic conditions at the time of their deposition. The Lower Vindhyan shales are characterized by high SiO2, low CaO and MgO, very low Na2O and very high K2O/ Na2O ratio relative to average Proterozoic shales. All the shale units are severely depleted in Ca, Na and Sr and slightly enriched in some trace elements such as Co and Nb, relative to the early Proterozoic upper continental crust. It appears that the high field strength and transition elements remained immobile throughout the sedimentary processes and represent the source rock composition. Geochemically, the individual shale units do not show any significant variation with age, excepting the Khardeola Shale that is relatively more enriched in ferromagnesian and large ion lithophile elements. Geochemical data suggest that sediments of Lower Vindhyan shales had their source in stable continental areas and deposited in intracratonic basin away from active plate boundaries. The immobile trace element data suggest that the source material of these shales have been derived from felsic and mafic components of Banded Gneissic Complex occurring to the west of the Great Boundary Fault in the proportion of about 4:1. Severe but non-steady-state weathering conditions in the source region having humid, and tropical climate appear to have prevailed throughout the sedimentation of Lower Vindhyan sequence. The sequence of events suggests passive type rifting environment during the Vindhyan Basin formation. | ||
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