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.
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References
Bai W J, Yang J S, Fang Q S, et al (2004a). Chemical composition of alloy from podifrom chromitites in the Luobusha ophiolite, Tibet. Acta Geologica Sinica, 78(5): 676–682 (in Chinese with English abstract)
Bai W J, Robinson P T, Fang Q S, et al (2004b). The PGE and base-metal alloys in the podiform chromitites of the Luobusha ophiolite, southern Tibet. Acta Geoscientifica Sinica, 25(4): 385–396 (in Chinese with English abstract)
Bai W J, Yang J S, Tao S F, et al (2003a). Si-Fe alloy assemblage in ophiolite of Tibet and their genesis. Acta Petrologica et Mineralogica, 22(3):279–284 (in Chinese with English abstract)
Bai W J, Yang J S, Fang Q S, et al (2003b). An unusual mantle mineral group in ophiolites of Tibet. Geology in China, 30(2): 144–150 (in Chinese with English abstract)
Hu X J (1995). Native fersilicite of China. Acta Petrologica et Mineralogica, 14(1): 71–77 (in Chinese with English abstract)
Knittle E, Jesnloz R (1991). Earth’s core-mantle boundary: Results of experiments at high pressure and temperatures. Science, 25: 1438–1443
Li G W, Shi N C, Ma Z S, et al (2005). A new method for powder-like diffractograms of small single crystals using an SMART APEX CCD detector. Acta Mineralogica Sinica, 25(1): 8–12 (in Chinese with English abstract)
Shi N C, Bai W J, Li G W, et al (2005). Crystal chemistry of metallic carbide minerals in the depths of earth. Earth Science Frontiers, 12(1): 29–35 (in Chinese with English abstract)
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Translated from Acta Petrologica et Mineralogica, 2005, 24(5): 453–456 [译自: 岩石矿物学杂志]
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Li, G., Shi, N., Xiong, M. et al. X-ray diffraction investigation of native Si-Fe alloy minerals from Luobusha, Tibet. Front. Earth Sci. China 1, 21–25 (2007). https://doi.org/10.1007/s11707-007-0003-8
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DOI: https://doi.org/10.1007/s11707-007-0003-8