| Synchrotron radiation X-ray diffraction in situ study of fine-grained minerals in shock veins of Suizhou meteorite |
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| 作者姓名： | XIE Xiande SHU Jinfu & CHEN Ming . Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China . Geophysical Laboratory Carnegie Institution of Washington Washington DC USA Correspondence should be addressed to Xie Xiande |
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| 作者单位： | XIE Xiande1，SHU Jinfu2 & CHEN Ming1 1. Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China; 2. Geophysical Laboratory，Carnegie Institution of Washington，Washington，DC，20015，USA Correspondence should be addressed to Xie Xiande |
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| 摘 要： | The Suizhou meteorite is an L6chondrite,which fell on April15,1986in Dayanpo,12.5km in the southeast of Suizhou City,Hubei Province,China1].This meteorite is shock-metamorphosed to shock stage3—42].A few thin shock melt veins of0.02—0.09mm in width were observed in this chondrite1,2].Similar to many other L6chondrites3—5],the Suizhou shock veins contain two assemblages of high-pressure minerals2,6—8]:(i)the“coarse-grained”assemblage of ringwoodite+majorite+NaAlSi3O8-hollandite…
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Synchrotron radiation X-ray diffraction in situ study of fine-grained minerals in shock veins of Suizhou meteorite |
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| XIE Xiande,SHU Jinfu & CHEN Ming . Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, . Geophysical Laboratory,Carnegie Institution of Washington,Washington,DC,,USA Correspondence should be addressed to Xie Xiande.Synchrotron radiation X-ray diffraction in situ study of fine-grained minerals in shock veins of Suizhou meteorite[J].Science in China(Earth Sciences),2005,48(6). |
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| Authors: | XIE Xiande SHU Jinfu CHEN Ming |
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| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA |
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| Abstract: | The synchrotron radiation X-ray diffraction technique developed for in situ study at high pressure and temperature has also been used to investigate microscopic mineral inclusions in ultrahigh-pressure metamorphic rocks and deep-mantle samples. Present study added two more examples of successful utilization of synchrotron radiation X-ray diffraction technique for in situ investigations of fine-grained (0.5―30μm in size) minerals in very thin shock melt veins of the Suizhou meteorite: ( i ) X-ray diffraction measurement of extremely small-sized vein matrix minerals, and (ii) identification of the micron-sized new mineral tuite embedded in the vein matrix. It has been revealed that the fine-grained vein matrix consists of well crystallized garnet, kamacite and troilite, and the powder diffraction pattern consisting of 17 lines with d-values, intensities ( I ), relative intensities (I/Io) and Miller indices, as well as the cell parameters for the new mineral tuite has also been successfully obtained. The result of present investigations has enriched the content of dynamic high-pressure mineralogy and that of Earth's mantle geochemistry. |
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| Keywords: | synchrotron radiation X-ray diffraction fine-grained minerals Suizhou meteorite |
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