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Micro-Mineralogical Approaches in Discoveries of Natural High-Pressure Minerals

XIE Xian-de, CHEN Ming   

  1. Guangzhou Institute of Geochemistry, Academic Sinica, Wushan, Guangzhou, 510640
  • Received:2000-06-20 Revised:2000-06-20 Online:2000-06-20 Published:2000-06-20

Abstract: 11 high-pressure minerals have been found in naturally shocked chondrites.These minerals are main phases of the Earth mantle transition zone and the lower mantl e.Since the grain sizes of the high-pressure minerals are very small, only 1-2 to several tens microns, various micro-mineralogical techniques have been deve loped for study and identification of these tiny minerals,espicially the laser m icro-Raman spectroscopy and the Brucker in-situ micro analytical X-ray system become the key technical approaches for identification of fine-grained new min erals in general, and the tiny new high-pressure polymorph minerals in thin sec tions of meteorites in particular. Some examples in discovery of new mineral pha ses in shock melt veins of chondrites using these techniques are demonstrated by the authors in this paper.