Unusual mantle mineral group from chromitite orebody Cr-11 in Luobusa ophiolite of Yarlung-Zangbo suture zone, Tibet

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• 作者：Xiangzhen Xu (1)
  Jingsui Yang (1)
  Songyong Chen (1)
  Qingsong Fang (1)
  Wenji Bai (1)
  Dengzhu Ba (2)
  
• 关键词：diamond ; chromitite ; Kangjinla ; Luobusa ; Tibet
• 刊名：Journal of Earth Science
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：20
• 期：2
• 页码：284-302
• 全文大小：3878KB
• 参考文献：1. Bai, W. J., Robinson, P. T., Fang, Q. S., et al., 2000a. The PGE and Base Metal Alloys in the Podiform Chromitites of the Luobusa Ophiolite, Southern Tibet. / Canadian Mineralogist, 38: 585-98 CrossRef
  2. Bai, W. J., Zhou, M. F., Robinson, P. T., et al., 2000b. Origin of Podiform Chromitites, Diamond and Associated Mineral Assemblage in the Luobusa Ophiolite, Tibet. Seismological Press, Beijing. 1-8 (in Chinese)
  3. Bai, W. J., Yang, J. S., Fang, Q. S., et al., 2003. An Unusual Mantle Mineral Group in Ophiolites of Tibet. / Geology in China, 30(2): 144-50 (in Chinese with English Abstract)
  4. Bai, W. J., Yang, J. S., Robinson, P. T., et al., 2001. Study of Diamonds from Chromitites in the Luobusa Ophiolite, Tibet. / Acta Geologica Sinica, 75(3): 404-09 (in Chinese with English Abstract)
  5. Bai, W. J., Zhou, M. F., Robinson, P. T., 1993. Possibly Diamond-Bearing Mantle Peridotites and Podiform Chromitites in the Luobusa and Dongqiao Ophiolites, Tibet. / Canadian Journal of Earth Sciences, 30(8): 1650-659
  6. Institute of Geology, Chinese Academy of Geological Sciences, 1981. The Discovery of Alpine-Type Diamond Bearing Ultrabasic Intrusions in Xizang (Tibet). / Geological Review, 27(5): 445-47 (in Chinese with English Abstract)
  7. Pearson, D. G., Davies, G. R., Nixon, P. H., et al., 1989. Graphitized Diamonds from a Peridotite Massif in Morocco and Implications for Anomalous Diamond Occurrences. / Nature, 338: 60-2 CrossRef
  8. Robinson, P. T., Bai, W. J., Malpas, J., et al., 2004a. Ultra-high Pressure Minerals in the Luobusa Ophiolite, Tibet and Their Tectonic Implications. / Geological Society of London, / Special Publication, 226: 247-71 CrossRef
  9. Robinson, P. T., Malpas, J., Zhou, M. F., et al., 2004b. Geochemistry and Origin of Listwanites in the Sartohay and Luobusa Ophiolites, China. In: Ernst, W. G., ed., Serpentine and Serpeninites. / Mineralogy, Petrology, Geochemistry, Ecology, Geophysics, and Tectonics, 8: 475-00
  10. Robinson, P. T., Trumbull, R., Schmitt, A., et al., 2008. Recycled Crustal Zircon from the Upper Mantle: Evidence from Ophiolites. 33rd IGC Abstract. http://www.cprm.gov.br/33IGC/1338218.html
  11. Wang, H. S., Bai, W. J., Wang, B. X., et al., 1983. Chromite Deposits in China and Their Origin. Science Press, Beijing. 1-27 (in Chinese)
  12. Wang, X. B., Bao, P. S., Deng, W. M., et al., 1987. Tibet Ophiolite. Geological Publishing House, Beijing. 1-36 (in Chinese)
  13. Yang, F. Y., Kang, Z. Q., Liu, S. C., 1981. A New Octahedral Pseudomorph of Lizardite and Its Origin. / Acta Mineralogica Sinica, 1: 52-6 (in Chinese with English Abstract)
  14. Yang, J. S., Bai, W. J., Fang, Q. S., et al., 2007a. Diamond and Unusual Minerals Discovered from the Chromitite in Polar Ural: A First Report. / EOS, Trans. AGU Fall Meet. Suppl., 88(52): V43E-05
  15. Yang, J. S., Dobrzhinetskaya, L., Bai, W. J., et al., 2007b. Diamond- and Coesite-Bearing Chromitites from the Luobusa Ophiolite, Tibet. / Geology, 35(10): 875-78 CrossRef
  16. Zhang, H. Y., Ba, D. Z., Guo, T. Y., et al., 1996. Study of Luobusa Typical Chromite Ore Deposit Qusong County, Tibet (Xizang). Xizang People Press, Lhasa. 1-81 (in Chinese)
  17. Zhang, R. Y., Yang, M. E., Hu, J. R., 1978. Discussion on Garnet in Kimberlite and Related Rocks. / Scientia Geologica Sinica, 2: 134-48 (in Chinese)
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• 作者单位：Xiangzhen Xu (1)
  Jingsui Yang (1)
  Songyong Chen (1)
  Qingsong Fang (1)
  Wenji Bai (1)
  Dengzhu Ba (2)
  
  1. Key Laboratory for Continental Dynamics of the Ministry of Land and Resources, Tibet Center for Continental Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
  2. The Second Field Team, Geology Bureau of Xizang, Lhasa, 850007, China
  
• ISSN：1867-111X

文摘

A wide variety of unusual mantle has been reported from podiform chromitite orebodies Cr-31 and Cr-74 in the Luobusa ( ophiolite, Tibet. A detailed investigation of chromitite orebody Cr-11, located in the Kangjinla ( district at the eastern end of the ophiolite, has revealed many of the same minerals, including diamond, moissanite, and some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates. This orebody is particularly rich in diamonds, with over 1 000 grains recovered from about 1 100 kg sample of chromitite. More detailed studies and experiments are needed to understand the origin and significance of these unusual minerals because they have not been found in situ. It is a great breakthrough in mineralogical research that we have picked up more than 40 kinds of minerals from the Kangjinla chromite deposit in Luobusa. It is notable that a large amount of diamonds were firstly discovered from the Kangjinla chromite deposit as well as many other unusual minerals, such as moissanites, rutiles, native irons, and metal alloys. Especially, that diamond was found again in different chromitites in the same ophiolite belt provided new key evidence for discussing the origin of the diamond and the hosted chromitite and ophiolite. The mantle mineral group in Tibet has great significance in mineralogy and geodynamics.