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

Yamuna Singh ¹, K. D. P. Singh ¹, A. K. Bhatt ²

Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Begumpet, Hyderabad- 500016, IN
2 J. L. N. Road, Jaipur-302004, IN

Abstract

X-ray powder diffraction data are presented for phurcalite [Ca₂(UO₂)₃ (PO₄)₂ (OH₄ 4H₂O], with orthorhombic symmetry, a very rare, yellow coloured, secondary uranium mineral, from Putholi (24°57'45":74"38'30"). The host rock is quartzite which contains fluorapatite, pyrite, goethite, hematite, magnetite, chlorite and mica as accessory minerals. Measured cell parameters of the phurcalite are: a₀ = 17.3416 Å,  b₀ = 16.1138 Å and c₀ = 13.5491 Å, with a cell volume of 3786.16 ų.

Keywords

Mineralogy, Phurcalite, Rajasthan.

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Yamuna Singh ¹, K. D. P. Singh ¹, R. N. Prasad ¹

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begump et, Hyderabad - 5000 16, IN

Abstract

Whole-rock Rb-Sr isochron dating of pink potassic (av.5% K₂O) granite from Dharmawaram, Karimnagar district, Andhra Pradesh, defines an isochron corresponding to an age of 2237±46 Ma with initial ⁸⁷Sr/⁸⁶Sr ratio of 0.71052±0.00084. The data suggest possible emplacement of potassic granite of Dharmawaram during early Proterozoic at ca. 2237 Ma. Further, high initial ⁸⁷Sr/⁸⁶Sr isotopic ratio of granite also indicates involvement of silicic crustal material in its genesis.

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Yamuna Singh ¹, K. D. P. Singh ¹, S. Srinivasan ¹, Jyotsna Chhabra ², R. K. Gupta ¹

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad- 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, West Block, R.K. Puram, New Delhi - 110 066, IN

Abstract

No Abstract.

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Yamuna Singh ¹, K. D. P. Singh ¹, Jyotsna Chhabra ², S. Srinivasan ¹, Y. C. Sharma ², R. K. Gupta ¹

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
2 R.K. Puram, West Block VII, New Delhi - 110 066, IN

Abstract

Koutekite and two polymorphs (i.e., alpha and beta) of domeykite (rare copper arsenide minerals) are reported for the first time from the uraniferous Lower Siwalik sandstones of the Romehra area, Hamirpur district, Himachal Pradesh. The calculated cell size of . alpha-domeykite (Cubic) is a₀ = 9.646 Å and that of betadomeykite (Hexagonal) is a₀ = 7.151 Å and c₀ = 7.304 Å. Koutekite (Hexagonal) has measured cell parameters of a₀ = 11.58 Å and c₀ = 14.55 Å. However, in koutekite of Romehra area an important interplanar spacing (d) at 2.081Å is merging with 'd' of beta dorneykite at 2.061Å and another interplanar spacing at 2.47Å exhibits comparatively higher intensity than the one published in JCPDS Data Card No.13-581. Association of domeykite with uraniferous sandstones points out that uranium mineralisation in Lower Siwaliks of the Romehra took place possibly below 90°C temperature.

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