X-ray diffraction investigation of native Si-Fe alloy minerals from Luobusha, Tibet |
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| Authors: | Li Guowu Shi Nicheng Xiong Ming Ma Zhesheng Bai Wenji and Fang Qingsong |
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| Institution: | (1) Crystal Structure Laboratory, China University of Geosciences, Beijing, 100083, China;(2) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China |
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| Abstract: | The origin of native Si-Fe alloy mineral is thought to be related with mantle and aerolite. The native Si-Fe alloy minerals
from podiform chromites of the Luobusha ophiolite in the Yarlong Zangbo suture zone were examined by a new method for powder-like
diffractograms of small single crystals, using an SMART APEX-CCD area-detector X-ray diffractometer. The powder diffraction
pattern shows that the minerals are composed of FeSi, FeSi2, β-FeSi2 and native silicon. The association of these minerals suggests that the crystallization order of the mineral may be from
early to late FeSi→FeSi2→native silicon, accompanied by gradually increasing deoxidization.
Translated from Acta Petrologica et Mineralogica, 2005, 24(5): 453–456 译自: 岩石矿物学杂志] |
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| Keywords: | native Si-Fe alloy mineral X-ray diffraction crystal structure mantle mineral Tibet |
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