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Banerjee, D. M.
- Genesis of Early Cambrian Phosphorite of Krol Belt, Lesser Himalaya
Abstract Views :283 |
PDF Views:103
Authors
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 25, Uttaranchal Apartments, 5, I.P. Extension, Patpargunj, Delhi 110 092, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 25, Uttaranchal Apartments, 5, I.P. Extension, Patpargunj, Delhi 110 092, IN
Source
Current Science, Vol 108, No 7 (2015), Pagination: 1247-1252Abstract
Early Cambrian phosphogenesis in the lesser Himalaya is represented by a well-developed sequence of phosphorite, black shale and black chert with interbedded phosphatic dolomite in the Krol Belt. Prevalence of shallow marine depositional structures support shallow subtidal to intertidal depositional environment. Similar shallow marine character for Late Vendian and Early Cambrian phosphorites have been recorded from Yangtze Basin (South China), Khubshugul Basin (Mongolia), Karatau Basin (Kazakhstan), Soltaniah Basin (Iran), Tal Basin (Lesser Himalaya, India), Hazara Basin (Pakistan) and Georgia Basin (Australia). We have characterized the Tal Phosphorites of Krol Belt, Lesser Himalaya in terms of mineralogy and petrography. The phosphogenic model for the modern Peru-Chile shelf-slope phosphorite is inadequate to explain the genesis of Cambrian phosphorite. Physicochemical characters of the Cambrian phosphorites demand a shallow marine phosphorous source. Based on the available early Cambrian oceanographic models, we envisage a repeated influx of P and 12C rich water on to the shallow platform. Amorphous calcium phosphate (ACP) precipitated from the shallow water column overlying the sediment water interface and subsequently modified to microsphorite (micritic phosphorite). Influx of P resulted in proliferation of algal mat and stromatolites, which are found in abundance in Tal phosphorites. The algal and mudstone phosphorites were the parent material for granular phosphorites.Keywords
Cambrian, Krol Belt, Phosphorite, Proterozoic, Tal Formation.Full Text
- Indra Bir Singh (1943–2021)
Abstract Views :146 |
PDF Views:69
Authors
Affiliations
1 25, Uttaranchal Apartments, 5, I.P. Extension, Patpargunj, Delhi 110 092, IN
1 25, Uttaranchal Apartments, 5, I.P. Extension, Patpargunj, Delhi 110 092, IN
Source
Current Science, Vol 120, No 4 (2021), Pagination: 728-729Abstract
No Abstract.Full Text
- Fate of Indian Geoheritage and GeoPark Bill
Abstract Views :295 |
PDF Views:80
Authors
Affiliations
1 25, Uttaranchal Apartments, 5, I.P. Extension, Delhi 110 092, IN
1 25, Uttaranchal Apartments, 5, I.P. Extension, Delhi 110 092, IN
Source
Current Science, Vol 121, No 2 (2021), Pagination: 183-184Abstract
No Abstract.Full Text
- A Monograph on Potential Geoparks of India
Abstract Views :173 |
PDF Views:81
Authors
Affiliations
1 Center of Advanced Studies in Geology, University of Delhi, Delhi 110 007, IN
1 Center of Advanced Studies in Geology, University of Delhi, Delhi 110 007, IN
Source
Current Science, Vol 122, No 2 (2022), Pagination: 218-219Abstract
No Abstract.Keywords
No Keywords.Full Text