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Bhairam, C. L.
- Peperite Occurrence and its Implications on Origin and Temporal Development of the Proterozoic Dhala Basin, Mohar Area, Shivpuri District, Madhya Pradesh
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1 Atomic Minerals Directorate for Exploration and Research, West Block VII, R.K. Puram, New Delhi - 110 067, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, 1-10-153/156, Begumpet, Hyderabad - 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, West Block VII, R.K. Puram, New Delhi - 110 067, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, 1-10-153/156, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 2 (2011), Pagination: 183-189Abstract
In the western part of Bundelkhand massif, a caldera with intra-caldera sediments, known as Dhala Formation, occurs as an outlier in and around Mohar village of Shivpuri district, Madhya Pradesh. For the first time, occurrence of peperite is being reported from the basal part of the Dhala sediment. Two types of peperites have been recognized: blocky and fluidal or globular with variable morphology. In peperitic zones, features like soft sediment deformations, presence of sediment into the rhyolite along cracks, vesiculation of the sediments and other evidences suggestive of sediment fluidization are some definite characteristics of interaction of hot magma with wet sediments forming peperite. The occurrence of peperites reflects the contemporaniety of deposition of the Dhala sediments and volcanism, which is well in accordance to the volcanic origin of Dhala structure. Further, the nature of unconformity between the Dhala and overlying Kaimur which is characterized by merely a few centimeter thick pebbly/conglomeratic bed does not appear to represent a large hiatus as expected between the Semri and Kaimur of Vindhyan Supergroup. So, the contemporaniety of the Dhala Formation (at least the lower part) as reflected by occurrence of peperites, coupled with the available age of the rhyolite and the nature of the unconformity between the Dhala and overlying Kaimur provide convincing evidence to correlate the Dhala Formation with the Lower part of the Kaimur and unlikely with the Semri Group or Bijawar as proposed earlier.Keywords
Caldera, Peperites, Dhala Sediment, Bundelkhand, Vindhyans, Madhya Pradesh.
- Clay Mineralogical Studies on Bijawars of the Sonrai Basin:Palaeoenvironmental Implications and Inferences on the Uranium Mineralization
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Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern Region, Delhi - 110 066, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern Region, Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 2 (2012), Pagination: 117-134Abstract
Clays associated with the Precambrian unconformity-related (sensu lato) uranium mineralization that occur along fractures of Rohini carbonate, Bandai sandstone and clay-organic rich black carbonaceous Gorakalan shale of the Sonrai Formation from Bijawar Group is significant. Nature and structural complexity of these clays have been studied to understand depositional mechanism and palaeoenvironmental conditions responsible for the restricted enrichment of uranium in the Sonrai basin. Clays (<2 μm fraction) separated from indurate sedimentary rocks by disaggregation, chemical treatment and centrifugation were examined using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Presence of tv-1M type illite is inferred from the Rohini and Bandai Members of the Sonrai Formation, indicative of high fluid/rock interaction and super-saturation state of the fluids available in proximity with the uranium mineralization. It is observed that the Sonrai Formation is characterized by kaolinite > chlorite > illite > smectite mineral assemblages, whereas, Solda Formation contains kaolinite > illite > chlorite clays. It has been found that the former mineral assemblage resulted from the alteration process is associated with the uranium mineralization and follow progressive reaction series, indicating palaeoenvironmental (cycles of tropical humid to semi-arid/arid) changes prevailed during maturation of the Sonrai basin. The hydrothermal activity possibly associated with Kurrat volcanics is accountable for the clay mineral alterations.Keywords
Clay Mineral Assemblages, Illite Crystallinity, Uranium Mineralization, XRD Patterns, Bijawar Group, Sonrai Basin.References
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