Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Prem Swarup ¹

Affiliations
1 Directorate of Geology and Mining, U.P., IN

Abstract

Deposits of bauxite were discovered by the Directorate of Geology & Mining, U.P. on the bed rock of Upper Vindhyan sandstone at Rajahuan, district Banda, Uttar Pradesh in the year 1965. This paper deals with the mineralogical studies done on the laterite profile of Rajahuan with the help of X-ray diffraction method. A brief description of the members of the profile along with the development and distribution of chemical constituents and minerals is given. In the bauxite, gibbsite is the chief mineral with subordinate boehmite, sometimes with minor diaspore. Anatase is fairly high. On the basis of field and laboratory data it is concluded that the Rajahuan laterite profile represents an in-situ residuum formed in a regular weathering profile with the bauxite forming in the zone of aeration, which is underlain by cavernous laterite developed in the zone of fluctuation of water table, and the basal lithomarge formed within the zone of saturation. It is suggested that the parent rocks of this residuum were a sandstone-shale sequence.

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Ravi Prakash ¹, Prem Swarup ¹, R. N. Srivastava ¹

Affiliations
1 Lucknow, U.P., IN

Abstract

The rocks of the Archaean basement complex and the overlying sedimentary sequences in the southern parts of the Bundelkhand in Lalitpur-Jhansi region, Uttar Pradesh are divided into tectonic blocks, within which broad but distinct stratigraphic units are recognised and classified. Recent mapping suggests that the entire area was subject to two major phases of sedimentary-volcanic process before regional granitisation during the Archaean. Granitisation, in preferred tectonic block, led to the development of an intra-cratonic belt controlled between lineaments, within which the younger Bijawar-Vindhyan basins developed.

The results of exploration done so far suggest that base-metals, gold, uranium and possible nickel mineralisation occurs within the different stratigraphic-tectonic environments recognised in this area.

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B. D. Shukla ¹, A. K. Singh ¹, Prem Swarup ¹

Affiliations
1 Lucknow, U. P., IN

Abstract

Presence of scheelite is reported in the panned concentrates prepared from stream sediments collected from certain tributaries of Pindar river in Chamoli district. Studies carried out so far show that scheelite mineralisation is strata-controlled occurring within a garnetiferous-mica schist member. The host rocks are (i) green coloured epidote-amphibole rich rock (amphibolite?) and (ii) light coloured quartz-epidotecalcite bodies (boudins ?). Associated minerals are calc-silicates namely, actinolite, diopside, garnet and epidote; calcite is also present mainly in boudins, The garnetiferous schist member has been traced in both the limbs of Almora-Dudatoli syncline, along with the mineralised host rocks. The study indicates possibility of tracing extensive scheelite deposits in the crystalline nappe rocks of Himalayas. The deposits are believed to be of volcano-sedimentary origin, where tungsten is derived from submarine volcanic processes that took place during the deposition of limy argillaceous sediments.

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