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Padhi, A. K.
- Effect of Dolerite Dyke on the Sediments of Motur Formation of Polapathar Area, Satpura Basin, Betul District, M.P. and its Implication for Uranium Mineralization
Abstract Views :191 |
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Authors
Affiliations
1 AMD, Department of Atomic Energy, Central Region, Nagpur - 440 001, IN
2 AMD, Department of Atomic Energy, Western Region, Jaipur - 302 030
1 AMD, Department of Atomic Energy, Central Region, Nagpur - 440 001, IN
2 AMD, Department of Atomic Energy, Western Region, Jaipur - 302 030
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1342-1350Abstract
Satpura Gondwana Basin around Polapathar contains feldspathic and subfeldspathic quartz arenites of the Motur Formation, with minor intercalations of shale and conglomerate, resting over the Barakar Formation. These sediments are intruded by a number of dolerite dykes trending NE-SW and E-W. The arenites, when close to the contact of dolerite dykes, are reddish brown coloured, rich in heavy minerals like ilmenite, monazite and zircon, have higher concentration of REE, especially LREE and devoid of uranium mineralization (<50 ppm uranium); hence, they are designated as non-mincralized arenaceous rocks (NMARs). The alteration of plagioclase to a mixture of sericite, calcite and clay minerals, and pronounced negative europium anomaly in these samples indicate europium fractionation in a high-temperature condition, possibly related to dolerite intrusion. The reddish grey coloured arenaceous rocks away from the contact of these dykes are rich in hematite, biotite and pyrite, host uranium mineralization (≥100 ppm U) and are termed as uranium mineralized arenaceous rocks (UMARs). These rocks contain a few grains of ilmenite, monazite and zircon, and, therefore, have low concentration of TiO2, and REE. The relatively flat chondrite-normalized REE pattern with slightly negative to positive europium anomaly in UMARs indicates preferential mobilization of other LREE in comparison to europium. Uraninite, brannerite, U-Ti complex, traces of coffinite and pitchblende are the uranium minerals. Besides, uranium is in adsorbed state on goethite, limonite and organic matter. The localized concentration of uranium in UMARs, confined between two NE-SW trending dykes, is suggestive of the re-mobilization of uranium from the sediments by heated groundwater and its concentration in suitable locales, with the dolerite dykes supplying the required thermal gradient for such re-mobilization.Keywords
U-mineralization, Satpura Basin, Motur Formation, Dolerite dykes, Thermal gradient, Polapathar, Madhya Pradesh.
- Serpentinized Peridotite-Hosted Uranium Mineralization (U–Cr–Ni–Mo–REE–Fe–Mg) in Kudada–Turamdih Area:A New Environment of Metallogeny in Singhbhum Shear Zone, India
Abstract Views :259 |
PDF Views:111
Authors
D. K. Sinha
1,
Shekhar Gupta
1,
K. Nautiyal
1,
V. R. Akhila
1,
V. K. Shrivastava
1,
A. K. Padhi
1,
M. B. Verma
1
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
Source
Current Science, Vol 117, No 5 (2019), Pagination: 830-838Abstract
Recent exploration efforts in Kudada-Turamdih area has brought to light, for the first time, serpentinizedperidotite- hosted uranium mineralization (up to 0.188% U3O8) of polymetallic nature (U–Cr—Ni–Mo–REE–Fe–Mg) in the domain of Singhbhum Shear Zone (SSZ). The peridotite has been emplaced into the Iron Ore Group (IOG) and represents late phase activity in the IOG. Exploratory drilling has established substantial lateral (600 m) and downdip (1000 m) continuity of the mineralization. Subhedral to anhedral disseminated uraninite grains (10–600 μm) with cell dimensions of 5.4498 to 5.4650 Å suggest crystallization in meso to hypo-thermal range (300– 500°C). Magnetite, chromite, molybdenite, cobaltite, nickeline, vaesite, cerussite, pyrite and chalcopyrite have also been identified in the REE enriched (Av. 1457 ppm) uraniferous peridotite. Presence of MgO (18–28%), Cr (295–3165 ppm), Ni (222–9530 ppm), Au (11–30 ppb), Pt (47–95 ppb) and As (15–755 ppm) suggests komatiitic parentage of host rock. Discovery of polymetallic mineralization in serpentinized peridotite, a hitherto unknown geological environment, opens up scope for further research and enhancement of uranium resources in the SSZ.Keywords
Polymetallic, Mineralization, Serpentinized Peridotite, Singhbhum Shear Zone, Uranium.Full Text
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