Textural characteristics,distribution pattern and provenance of heavy minerals in glacial sediments of Schirmacher Oasis,east Antarctica |
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| Authors: | Ashok K Srivastava Pravin S Ingle Neloy Khare |
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| Institution: | (1) Department of Invertebrate Zoology, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden |
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| Abstract: | Heavy minerals of twenty sediment samples, belonging to polar ice sheet, lake, mainland area and shelf region of Schirmacher
Oasis, east Antarctica, have been studied for their textural characteristics, abundance and provenance determination. The
heavy crop is represented by zircon, tourmaline, rutile, garnet, hypersthene, hornblende, chlorite, enstatite, lawsonite,
kyanite, sillimanite, zoisite, andalusite, spinel, topaz and opaques. The assemblage, in general, is dominated by hornblende-hypersthene-garnet
assemblage, followed by kyanite-sillimanite-andalusite and zircontourmaline-rutile. The high concentration of specific minerals
of metamorphic origin reveals high-grade metamorphic terrain as the primary source. The ZTR ratio is low showing low mineralogical
maturity. An attempt has also been made to compare the trends of heavy minerals of various sub glacial regions with those
of the average values of entire area. |
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