naa a22 4500 510754872 CHVBK 20180411083119.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s12594-013-0007-9 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0007-9 X-ray crystallography of uraninites associated with the albitite belt of western India: Evidence for the high-temperature origin of uranium and associated mineralisation [Elektronische Daten] [Yamuna Singh, R. Viswanathan, P. Parihar, P. Maithani] X-ray diffraction (XRD) studies on the radioactive ore samples from various parts of Rajasthan and Haryana have revealed the presence of several uranium and other atomic mineral occurrences in the albitite belt of western India. The primary uranium minerals (PUMs) are uraninite and brannerite, whereas, the secondary uranium minerals (SUMs) show considerable speciations: phosphate, silicate, hydrous oxide hydrate, and vanadate. Multiple oxides (MOs) are davidite, fergusonite, aeschynite-(Y), microlite, samarskite, euxenite, betafite, and columbite-tantalite. The thorium minerals are huttonite, thorite, uranoan-thorite, thorianite, thorutite, and brabantite. The yttrium and REE-bearing minerals are xenotime, britholite, allanite, chevkinite, tritomite, and monazite. It is noted that the measured unit cell dimension (a0) of the investigated uraninites ranges from 5.4110 Å to 5.4646 Å. The highest unit cell dimension (5.4646 Å) represents a composition (or oxidation grade) of UO2.05, whereas, the lowest one (5.4110 Å) corresponds to a composition of UO2.54. Furthermore, it is also apparent that, with increase in oxidation grade, there is a concomitant decrease in unit cell dimension. As most of the values of ao of uraninites from the albitite belt are high (> 5.45 Å), it may be inferred that the overall temperature of formation of uraninites of the albitite belt was higher (ca. 400°C). However, the low values of a0 in certain localities could be due to the prevalence of relatively low and fluctuating temperature regimes locally (ca. 400°-100° C). Numerous occurrences of refractory, multiple oxides, and REE minerals, in association with uranium mineralisation, also support a high-temperature origin for the investigated uraninites. Binary data plots of unit cell dimension (a0) versus oxidation grade/composition (UO2+x) of uraninites (n = 36) suggest that the gross uranium mineralisation in the albitite belt of western India is mainly linked to regional metamorphism, anatexis, granitic intrusion, metasomatism, and contact metamorphosed granite-pegmatite aureoles and granite-related vein type with hydrothermal overprints, including redistribution of intrinsic sedimentary uranium and its concentration along suitable structural locales. These interpretations are consistent with the known gross geologic features of the albitite belt. Furthermore, the presence of marialite (calcian) in many places in the albitite belt also supports such a contention, as this mineral is known to be restricted to metamorphic and metasomatic environments. The speciation of secondary uranium minerals could be due to the higher oxidation of U4+ to U6+ in surface to near-surface conditions and its (U6+) remobilisation as uranyl ions. The combination of moving uranyl ions with available cations and anions en route caused re-precipitation of U as diversified assemblages of low-temperature uranyl minerals under suitable physicochemical conditions. Geological Society of India, 2013 X-ray diffraction nationallicence X-ray crystallography nationallicence Uraninite nationallicence Secondary uranium minerals nationallicence Albitite. Western India nationallicence Singh Yamuna Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut Viswanathan R. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut Parihar P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut Maithani P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut Journal of the Geological Society of India Springer-Verlag 81/1(2013-01-01), 79-90 0016-7622 81:1<79 2013 81 12594 https://doi.org/10.1007/s12594-013-0007-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0007-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Singh Yamuna Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut NATIONALLICENCE 700 1- Viswanathan R. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut NATIONALLICENCE 700 1- Parihar P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut NATIONALLICENCE 700 1- Maithani P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Government of India, 500 016, Begumpet, Hyderabad, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/1(2013-01-01), 79-90 0016-7622 81:1<79 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer