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Mondal, S. K.
- PGE-Ag-Au Mineralization in a Cu-Fe-Ni Sulphide-Rich Breccia Zone of the Precambrian Nuasahi Ultramafic-Mafic Complex, Orissa, India
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Authors
Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN
2 Refractory Division, Central Glass & Ceramic Research Institute, Calcutta 700 032, IN
3 Geochemistry Group, National Geophysical Research Institute, Hyderabad 500 007, IN
4 Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, IN
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN
2 Refractory Division, Central Glass & Ceramic Research Institute, Calcutta 700 032, IN
3 Geochemistry Group, National Geophysical Research Institute, Hyderabad 500 007, IN
4 Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 5 (1999), Pagination: 473-482Abstract
The Precambrian ultramafic-mafic plutonic complex of Nuasahi, Orissa in the Eastern Indian Shield represents at least three suites of magmatic intrusion: (i) an interlayered sequence of enstatitite, websterite (± olivine), dunite, chromitite, harzburgite and orthopyroxenite; (ii) massive gabbroic suite with minor bodies of norite, anorthosite and bands of titaniferous magnetite and (iii) dykes and sills of dolerite and clinopyroxenite. A prominent breccia zone is developed near the interface of the first and second magmatic suites in the eastern part of the complex including the Shankar chromite lode and the ultramafic host of the first suite, and the gabbro-noritic rocks of the second suite. This breccia zone is enriched in Cu-Fe-Ni sulphides and has become the principal site for concentration of PGE, gold and silver. On a whole, Pd dominates over Pt in the sulphide-bearing Shankar chromite lode and the adjacent orthopyroxenite as well as gabbro in this breccia zone. The chromite-sulphide association is the most enriched part for PGE, gold and silver. Ag is positively correlated with Pd. The breccia zone which was developed prior to the gabbroic emplacement into the chromiferous ultramafics. represents a sulphide-rich metasomatic zone leading to maximum concentrations of PGE, Au, Ag in this zone alongwith formation of various sulphides, oxides and silicates. Both Pt and Pd are considerably higher and Ir is lower in the present area than in chromite-sulphide associations from ophiolitic complexes and Alpine-type massifs. Rather, Pt, Pd and Ir values compare better with the chromite-sulphide associations from layered intrusions.Keywords
Economic Geology, Ultramafic-Mafic Complex, Breccia Zone, Chromite-Sulphide Assemblage, PGE-Ag-Au, Nuasahi, Orissa.
- Identification of Active Seismicity by Fractal Analysis for Understanding the Recent Geodynamics of Central Himalaya
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Authors
P. N. S. Roy
1,
S. K. Mondal
1
Affiliations
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad, Jharkhand - 826 004, IN
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad, Jharkhand - 826 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 353-360Abstract
Seismicity along the Himalayan front is mostly attributed to the processes of collision between the Indian and the Eurasian plates resulting in the under-thrusting of the Indian Peninsula underneath the Himalaya. The dynamics of the region bears very complex components which require in-depth understanding. Here the overall rate of crustal shortening since ∼11 Ma is ∼21mm/yr, which is comparable to modern rate of under-thrusting of the northern Indian plate beneath the Himalaya. The region experienced a large number of great earthquakes for the last 100-120 years causing massive destruction. Here an attempt has been made to understand the seismicity pattern of the region using fractal correlation dimension and hence used for the detection of active seismicity. Some clusters of seismicity were found to be indicative of seismically very active zones. Such clusters may enlighten the understanding of recent complex dynamics of Himalayan zone.Keywords
Fractal Dimension, Geodynamics, Seismicity, Himalaya.References
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