| Water in granulites: implications for the nature and evolution of the lower continental crust |
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| 作者姓名： | YANG Xiaozhi XIA Qunke Etienne DELOULE FAN Qicheng HAO Yantao |
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| 作者单位： | 1. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China； 2. CRPG-CNRS, BP20, 54501 Vandoeuvre Cedex, France； 3. Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| 基金项目： | Supported by National Natural Science Foundation of China (Grant No. 40473007)，the Program for New Century Excellent Talents in University (NCET), the Science and Social Practice Fund for Graduate of CAS and the Innovation Fund for Graduate of University of Science and Technology of China |
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| 摘 要： | The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some long-standing debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.
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| 关 键 词： | continental lower crust， granulites， fluids， water， nominally anhydrous minerals. |
Water in granulites: implications for the nature and evolution of the lower continental crust |
| |
| Authors: | YANG Xiaozhi XIA Qunke Etienne DELOULE FAN Qicheng HAO Yantao |
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| Abstract: | The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some long-standing debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration. |
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| Keywords: | continental lower crust granulites fluids water nominally anhydrous minerals |
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