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Nair, A. M.
- The Chromites of Byrapur, Karnataka
Abstract Views :159 |
PDF Views:2
Authors
K. C. Sahu
1,
A. M. Nair
2
Affiliations
1 Indian Institute of Technology, Powai, Bombay 400076, IN
2 Centre of Earth Sciences Studies, Trivandram, IN
1 Indian Institute of Technology, Powai, Bombay 400076, IN
2 Centre of Earth Sciences Studies, Trivandram, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 23, No 7 (1982), Pagination: 330-337Abstract
Chemical study on clean chromites reveals enrichment of chromium and iron due to alteration. Physico-chemical properties show that alteration has enhanced the cell-edge, reflectivity and specific gravity but reduced the microhardness of the mineral. The reemplacement and subsequent instability of tectonic conditions might be the ultimate cause for the shift of Byrapur chromites from aluminian to ferrian field of composition.- Studies on Zircon - Host Rock/Sediment Association along Manimala River Meanders in Kerala
Abstract Views :206 |
PDF Views:6
Authors
A. M. Nair
1,
Narayanaswamy
1
Affiliations
1 Centre for Earth Science Studies, Trivandrum, IN
1 Centre for Earth Science Studies, Trivandrum, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 5 (1984), Pagination: 277-285Abstract
Comparative morphometric analysis of zircons from sediments and charnockite-quartzo-feldspathic gneiss-pegmatite rock units along the Manimala river valley in Kottayam and Alleppey districts of Kerala has brought to light a unimodal-bimodal size frequency distribution of zircons transported via a major meander near Komalam in Alleppey district. The slope variation in the up-mid (meander)-downstream zircons is 25°28' to 30°17'. The trapping of heavy minerals (0.002%-0.004%) by the meander has also affected the anticipated coastward enrichment of zircons. RMA plots for the rocks reveal the self-nucleated origin of zircons and the dispersion of trend lines suggests phases of zircon crystallization. Heavy minerals released from the rocks as revealed from zircon morphometry, are not carried through to the coast. Nevertheless, the coastward enrichment of Cu-Pb-Zn concentration indicates a steady flow right up to the coast of only the fine sediment fraction with these absorbed elements.- Trace Element Studies of the Zircon Separates and the Related Host Rock/Sediment Assemblage Along Manimala River, Kerala
Abstract Views :186 |
PDF Views:2
Authors
Affiliations
1 Analytical Chemistry Division, BARC, Bombay 400085, IN
2 Geosciences Division, Centre for Earth Science Studies, Trivandrum, Kerala 695010, IN
1 Analytical Chemistry Division, BARC, Bombay 400085, IN
2 Geosciences Division, Centre for Earth Science Studies, Trivandrum, Kerala 695010, IN