| Partial Melting and Its Implications for Understanding the Seismic Velocity Structure within the Southern Tibetan Crust |
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| 作者姓名： | YANG Xiaosong MA Jin JIN Zhenmin GAO Shan and MA Shengli Geology Institute China Seismological Bureau Beijing Laboratory of Tectonophysics China Seismological Bureau Beijing Faculty of Earth Sciences China University of Geosciences Wuhan Hubei |
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| 作者单位： | YANG Xiaosong，MA Jin，JIN Zhenmin，GAO Shan and MA Shengli Geology Institute，China Seismological Bureau，Beijing 100029;Laboratory of Tectonophysics，China Seismological Bureau，Beijing 100029 Faculty of Earth Sciences，China University of Geosciences，Wuhan，Hubei 430074 |
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| 基金项目： | the Key Basic Research and Development Program of China，国家自然科学基金，the Foundation of the Open Laboratory of Tectonophysics |
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| 摘 要： | In order to constrain the crustal wave velocity structure in the southern Tibetan crust and provide insight into the contribution of crustal composition, geothermal gradient and partial melting to the velocity structure, which is characterized by low average crustal velocities and widespread presence of low-velocity zone(s), the authors model the crustal velocity and density as functions of depth corresponding to various heat flow values in light of velocity measurements at high temperature and high pressure. The modeled velocity and density are regarded as comparison standards. The comparison of the standards with seismic observations in southern Tibet implies that the predominantly felsic composition at high heat flow cannot explain the observed velocity structure there. Hence, the authors are in favor of attributing low average crustal velocities and low-velocity zone(s) observed in southern Tibet mainly to partial melting. Modeling based on the experimental results suggests that a melting percentage
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Partial Melting and Its Implications for Understanding the Seismic Velocity Structure within the Southern Tibetan Crust |
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| Authors: | YANG Xiaosong MA Jin JIN Zhenmin GAO Shan and MA Shengli Geology Institute China Seismological Bureau Beijing Laboratory of Tectonophysics China Seismological Bureau Beijing Faculty of Earth Sciences China University of Geosciences Wuhan Hubei |
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| Institution: | Geology Institute, China Seismological Bureau, Beijing 100029;Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029;Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074 Geology Institute, China Seismological Bureau, Beijing 100029;Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029 Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074 Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074 Geology Institute, China Seismological Bureau, Beijing 100029;Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029 |
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| Abstract: | In order to constrain the crustal wave velocity structure in the southern Tibetan crust and provide insight into the contribution of crustal composition, geothermal gradient and partial melting to the velocity structure, which is characterized by low average crustal velocities and widespread presence of low-velocity zone(s), the authors model the crustal velocity and density as functions of depth corresponding to various heat flow values in light of velocity measurements at high temperature and high pressure. The modeled velocity and density are regarded as comparison standards. The comparison of the standards with seismic observations in southern Tibet implies that the predominantly felsic composition at high heat flow cannot explain the observed velocity structure there. Hence, the authors are in favor of attributing low average crustal velocities and low-velocity zone(s) observed in southern Tibet mainly to partial melting. Modeling based on the experimental results suggests that a melting percentage of 7-12 could account for the low-velocity zone(s). |
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| Keywords: | partial melting intracrustal low-velocity zone high-pressure and high-temperature experiments Tibetan plateau |
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