Heavy minerals of the Barakar Formation,Talchir Gondwana Basin,Orissa |
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| Authors: | Rabindra Nath Hota Wataru Maejima |
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| Institution: | 1.P.G. Department of Geology,Utkal University,Vani Vihar, Bhubaneswar,India;2.Department of Geosciences,Osaka City University,Osaka,Japan |
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| Abstract: | Heavy mineral analysis has been carried out in the Barakar Formation of the Talchir Gondwana Bbasin, Orissa. The characteristic
heavy minerals are garnet, zircon, tourmaline, rutile, biotite, chlorite, pyroxenes, hornblende, staurolite, sillimanite,
apatite, epidote, sphene, spinel and siderite including opaques and leucoxene. These heavy minerals are divisible into four
groups on the basis of principal component analysis and suggest derivation of Barakar sediments from pegmatite, acid and basic
igneous as well as low- and high-rank metamorphic rocks lying to the south of the Talchir Gondwana Basin. Though the heavy
mineral suites of all the sandstone samples are by and large similar, differences have been noticed in the frequencies of
many heavy minerals in vertical succession. Cyclic nature and vertical fluctuation of heavy mineral frequencies can be ascribed
to variation of the relief of the source area, sudden release of some of the minerals in the source region and/or existence
of favourable geochemical condition to escape partial dissolution. |
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