High-pressure hydrous mineral association in Hannuoba Iherzolite |
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| Authors: | Xie Hongsen Zhang Huifen Zhang Yueming Xu Huigang Zhuang Shijie |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China;(2) Institution of Mineral Resources and Geology, China National Non-ferrous Metal Industry Co., China |
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| Abstract: | A brown fine-grained mineral aggregate in the form of plate and stuffing was found in the Hannuoba spinel-lherzolite. A series
of measurements, including X-ray powder diffraction, infrared spectrometry, DTA and electron microprobe analysis, were made
on this aggregate. The results show that the aggregate consists of the following minerals: hydrous magnesio-silicate minerals,
metamorphic chrysotile, ringwoodite, spinel, rutile, forsterite etc. This is a high-pressure hydrous mineral aggregate never
reported in lherzolite elsewhere.
Based on the compositions and distribution features of the minerals, it is suggested that the fine-grained mineral aggregate
was derived from phlogopite, which had been formed early in the upper mantle and was hydrolyzed during partial melting. |
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