Dehydration melting of solid amphibolite at 2.0 GPa: Effects of time and temperature |
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Authors: | Email author" target="_blank">Wenge?ZhouEmail author Hongsen?Xie Yonggang?Liu Xiaogang?Zheng Zhidan?Zhao Hui?Zhou |
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Institution: | 1. Laboratory of Material in the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Department of Geology, China University of Geosciences, Beijing 100083, China 3. Department of Geology, Peking University, Beijing 100871, China |
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Abstract: | Two sets of dehydration-melting with a natural solid amphibolite, collected from North Himalayan structure zone, Tibet, have
been carried out in multi-anvil apparatus at 2.0 GPa and 800–1000°C, for 12-200 h. One is keeping the pressure at 2.0 GPa
and the annealing time of 12 h, changing the temperature (800–1000°C). The other is keeping the pressure at 2.0 GPa and temperature
at 850°C, varying the annealing time (12–200 h). The products are inspected with microscope and electron probe. The results
indicate that at 2.0 GPa, annealing time of 12 h, garnets, melts and clinopyroxenes occur in amphibolite gradually with increasing
temperature and the chemical compositions of melt vary from tonalite to granodiorite, and then to tonalite. However, at 2.0
GPa and 850, with the annealing time increasing, the garnets, melts and clinopyroxenes also occur in amphibolite gradually
and the chemical compositions of melt vary from tonalite to granodiorite. In both cases, melts interconnect with each other
when the contents of melt are over the 5 vol.%. the viscosities of the melt produced in amphibolite at temperature higher
than 850 are on a level with 104 Pa·s. The interconnected melt with such a viscosity may segregate from the source rock and form the magma over reasonable
geological time. Therefore, it is believed that at the lower part of the overthickened crust, the tonlitic and granodioritic
magma may be generated through the dehydration melting of amphibolite. |
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Keywords: | solid amphibolite high pressure high temperature time partial melting |
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