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Bisht, B. S.
- Distribution of U-Th-K in Metamorphic Rocks of Siang Group in Parts of Baririjo-Maro-Gamkak-Kau-Darak Section, West Siang and Upper Subansiri Districts, Arunachal Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad-500016, IN
2 Regional Centre for Exploration and Research, AMD, Nagpur-440016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 5 (2000), Pagination: 537-545Abstract
Metamorphic rocks of the Siang Group in West Siang and Upper Subansiri districts, Arunachal Pradesh, have anomalous concentration of intrinsic radioelements (viz., U, Th and K). The study reveals that psammopelites comprising paragneiss, carbonaceous phyllite and quartzite/phyllite/mica schist (av. 8.2-27.3 ppm U, 19.7-42.8 ppm Th, 2.2-4.0 % K); volcano-sedimentary garnet amphibolite (av. 14.3 ppm U, 23.1 ppm Th, 1.8 %K), and intrusive feldspar porphyry (av. 12.7 ppm U, 26.3 ppm Th, 5.9 %K) have higher radioelement contents, particularly U, in comparison to pelitic graphite schist, iron formation and metabasics (av. <4.2-4.7ppm U, 18.5-60.2 ppm Th, 3.3-4.9 %K). All rock types, except feldspar porphyry, exhibit noticeable difference in mean U and Ra (eU) values. Variation in U content has been conspicuous in carbonaceous rocks, with phyllitic units more enriched than graphitic schists. U and Th contents appear to be independent of K concentration in all rock types. Such features of variable radioelement concentration indicate differences in the composition of precursor sedimentary rocks and also differential mobility during metamorphism.Keywords
Siang Group, Radioelements, Metamorphism, Arunachal Pradesh.- Geological Characteristics of the Iron-Uranium Mineralisation in the Lesser Himalayan Region of Arunachal Pradesh
Authors
1 Atomic Mineral Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad- 500 016, IN
2 Atomic Mineral Directorate for Exploration and Research, Department of Atomic Energy, Jaipur - 303 906, IN
3 Department of Geology, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 2 (2005), Pagination: 185-202Abstract
In the lesser Himalayan region of Arunachal Pradesh, northeastern India, iron-Uranium (Fe-U) mineralisation characterises the volcano-Sedimentary sequence belonging to the Middle-Late Proterozoic Siang Group. The host rocks metamorphosed in the greenschist to lower amphibolite facies are intensely deformed.The lithological, structural, petrological and geochemical parameters indicate involvement of three distinct processes resulting in the Fe-U mineralisation. These comprise early sedimentary deposition, mainly of Fe-Oxides, Fe-Sulphides and minor U, followed by local metamorphic redistribution of U, and lastly hydrothermal mineralisation leading to deposition of mainly uranium and REE bearing minerals and minor Fe-Cu sulphides.
Syngenetic iron oxide mineralisation occurs in the form of ironstone containing 44 to 63 wt percent Fe. The lithological association of ironstone and low contents of Ti, V, Cr, Co and Ni in magnetite support this contention. Sulphides, mainly pyrite with subordinate chalcopyrite and molybdenite form bands, stringers and veins. The sulphur isotopic ratios (δ34S) of pyrites in different formations exhibit a small range of +11.1 to +15.8 %. suggesting derivation of sulphur mainly from the seawater sulphate and hydrothermal sources.
Variation in the U-content of the rocks in the mineralisation zone is attributed to the differences in the composition of precursor sediments and also to differential mobility of uranium during progressive metamorphism.
Epigenetic U-Mineralisation related to quartzo-Feldspathic veins occurs along fractures and foliations and has caused wall rock alterations such as chloritisation, epidotisation, silicification, and sericitisation. Association of uraninite, brannerite, davidite, fluorite, tourmaline, albite, biotite and quartz characterise the uraniferous rocks. These rocks also contain significant REEs. The calc-Alkaline granitic magma of Cambro-Ordovician Period is considered to be the ultimate source of U.
Oxidation of host rocks resulted in extensive goethitisation and kaolinisation in the weathering zone.
Keywords
Fe-U Mineralisation, Himalayas, Arunachal Pradesh, India.- Geological Characteristics of the Iron-Uranium Mineralization in the Lesser Himalayan Region of Arunachal Pradesh
Authors
1 Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
2 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad- 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 6 (2005), Pagination: 773-776Abstract
No Abstract.- Fluid Inclusion Characteristics of Unconformity-Related Uranium Mineralisation, Lambapur-Peddagattu Area, Andhra Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research Department of Atomic Energy, Begumpet, Hyderabad- 500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 1 (2001), Pagination: 45-51Abstract
Aqueous bi-phase fluid inclusions in quartz from mineralised vein, granite and pebbly quartzite have been studied to decipher physico-chemical conditions of the unconformity-related uranium mineralisation at Lambapur- Peddagattu area in the northern fringe of Cuddapah basin. Fluid inclusions in vein- and granitic- quartz show significant similarity in phase ratios and homogenisation temperatures, though they differ in the mode of origin. main population of inclusions in vein quartz is of primary origin, while in granitic quartz it is of secondary origin. The size of fluid inclusions generally varies between lOpm to 20pm, with low gas to liquid ratios corresponding to high degree of fill (F=0.8 to 0.9). Inclusions in vein- and granitic- quartz homogenise to liquid phase between 140°C to 240°C (mode 150°C to 170°C) [TH]. Similar temperature of homogenisation has been obtained in quartz of pebbly quartzite. The ice melting temperatures in vein quartz are in the range of -2°C to - 10°C [TM] equivalent to salinity of 1-14 wt% eNaCl and in granitic quartz these are in the range of -6°C to -14"C[TM] corresponding to salinity values of 10-18 wt% eNaC1. The low temperature fluid inclusions homogenising at similar range of temperatures but showing variable salinity suggest mixing of isothermal fluids of contrasting salinity. It is likely that uranium precipitated from the interaction of cooling low saline hydrothermal solution at the temperatures of 150-170°C with high saline mineralising fluid transported by recirculating meteoric water.Keywords
Fluid Inclusions, Microthermometry, Uranium Mineralisation, Cuddapah Basin, Andhra Pradesh.- Compositional Characterisation of Biotite from the Gamkak and Jaiyor Areas in the West Siang District, Arunachal Pradesh with Implications on Uranium Mineralisation
Authors
1 Atomic Minerals Directorate of Exploration and Research, Department of Atomic Energy Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 5 (2006), Pagination: 784-788Abstract
Compositional Characterisation of biotite from two distinctly different geological domains of the Gamkak and Jalyor areas in the West Siang district, Arunachal Pradesh has been carried out. The environments of formation of biotite in the areas have been inferred from the compositional data Conspicuous differences in chemistry have been observed in biotite from metamorphic mica schist and hydrothermal uraniferous vein Compositionally vein biotite associated with uranium minerals, uraninite, branncrite and occasionally davidite contain significantly higher (mean) MgO (17 38%), F (7 33%) and Si02, (38 95%) and lower (mean) Al203 (12 78%) when compared to the biotite in Non-Uranifeious mica schist (mean) MgO (5 67%), F (1 53%) SiO2, (34 54%) and Al2O3 (17 58%). Minor differences do exist in the concentration of TIO2, FeO and Na2O in these biotite. The MgO-Fe0-Al2o3 , plot reveals that the biotite from uranifcrous vein is of calc-alkaline variety and that in mica schist is peialuminous.Keywords
Blotite, Mica Schist, Uraniterous Vein, Gamkak Jaiyor, Arunachal Pradesh.- Historical Journey with Amaranth
Authors
1 Uttarakhand State Council for Science & Technology, Science City, Dehradun 248007, Uttarakhand, IN
2 HNB, Garhwal University, SRT, Campus Badshahithoul, Tehri, 249199, Uttarakhand, IN
Source
Asian Agri-History, Vol 20, No 3 (2016), Pagination: 201-210Abstract
Amaranth is the common name for more than 60 different species of Amaranthus, which are usually 5-7 feet tall with broad green leaves and impressively bright purple, red, or golden flowers. It is said to be native of India and is most common summer leafy vegetable in the plains of Indian sub-continents. Three species Amaranthus cruenus, A. hypochondriacus, and A. caudatus are commonly grown for their edible seeds, while the A. tricolor L. and A. bilitum L. both are herbaceous annual grown for leaf purposes. Amaranth is a versatile warm-season, broad leaf plant that can be grown as a grain, ornamental, leafy vegetable, or forage crop. The seeds are high in lysine, fiber, and protein; low in saturated fats; and gluten-free. Amaranth can be ground into flour, popped like popcorn, or flaked like oatmeal. Because many of amaranth's uses are similar to that of cereal grasses, amaranth is often referred to as a pseudo-cereal. Products containing amaranth include breakfast cereals, granola, crackers, breads, cookies, and other flour-based products. The name for amaranth comes from the Greek amarantos, one that does not wither," or "the never-fading" true to form. Amaranth's bushy flowers retain their vibrancy even after harvesting and drying, and some varieties of ornamental amaranth forego the production of fancy flowers in favor of flashy foliage, sprouting leaves that can range from deep blood-red to light green shoot with purple veining. It isn't a true cereal grain in the sense that oats, wheat, sorghum, and most other grains are. "True cereals" all stem from the Poaceae family of plants, while amaranth (among others) is often referred to as a pseudo-cereal, meaning it belongs to a different plant species.References
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- Uranium Mineralization in Kappatralla Outlier of Gulcheru Quartzite Formation, Mesoproterozoic Cuddapah Supergroup, Kurnool District, Andhra Pradesh, India
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad 500 016, IN
Source
Current Science, Vol 116, No 8 (2019), Pagination: 1294-1298Abstract
In the eastern Dharwar craton, the crescent- shaped Cuddapah Basin forms a large intracratonic basin, comprising Meso–Neoproterozoic sedimentary sequence with volcanic rock components. The sedimentary environment of the Cuddapah Basin, in general, is comparable with peri-tidal complex with shallow marine carbonate shelf and beach environment. Systematic geological studies of the Cuddapah Basin are well documented1,2. The litho-units of the basin are mainly divided into older Cuddapah Supergroup and a younger Kurnool Group. The former is present throughout the basin, while the younger group is seen in its western and northeastern parts. The sediments of the basin overlie the Late Archaean–Lower Proterozoic granitoids intruded by basic and ultrapotassic dykes.References
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