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P-Wave Velocity in Rocks of Dabieshan, china at High Pressure and High Temperature: Constraints for Composition of Lower Crust and Crust-Mantle Recycling

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Journal of Earth Science 1999年第4期18卷 295-298页

作者： Zhao Zhidan Zhou Wenge Xie Hongsen Guo Jie xu Zuming(institute of Geochemistry, chinese academy of sciences, Guiyang 550002)zhang zeming(institute of geology, chinese academy of geological sciences, beijing 100037) institute of Geochemistry Chinese Academy of SciencesGuiyang 550002 institute of geology Chinese Academy of Geological SciencesBeijing 100037

P-wave velocities in the rocks of Dabieshan, central china were measured at pressures up to 5.0 GPa and temperatures up to 1 300℃. The ultrahigh pressure eclogites have the highest density and P-wave velocity (Vp) and lower anisotropy. Pressure derivatives of the eclogites range from 0. 22 to 0. 33 km. s-1 GPa-1. Average temperature derivative of the eclogites is - 3. 41×10-4 km. s-1. °C -1. The density and VP of the eclogites imply that there will be two united possibilities related to crust-mantle recycling after the eclogite formed in the deep lithosphere. One is that some eclogites in the deep lithosphere were detached and sunk into deeper mantle due to their denser density. Another is that some eclogites returned to the crust and exposed to the *** amounts (<12%) of eclogites may be still exist in the deep crust beneath Dabieshan based on our calculation.

关键词： eclogite P-wave velocity density high pressure high temperature lower crust

Deformational History of Jiaonan UHP Terrane

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Continental Dynamics 1996年第2期 164-170页

作者： yang tiannan xu Huifen zhang Jianxin Zeng Lingsen (institute of geology, chinese academy of geological sciences, beijing 100037, china)Song Mingchun (Regional geological Survey Team, geological Bureau of Shandong Province,Jiaozhou 266300, china)

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关键词： Jiaonan terrane deformational history subduction detachment uplift-extension

Micro-area Chemical Composition and Preserved P-T Evolution Trace of Phengite in Albite Gneiss from the Donghai Ultrahigh-Pressure Metamorphic Area,East china

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 183-189页

作者： LIU Fulai zhang zeming xu zhiqin yang Jingsui xu Huifen institute of geology Chinese Academy of Geological SciencesBeijing 100037China

Study of micro-area chemical compositions indicates that phengite in albite gneiss from hole ZK2304 of the Donghai region has evident compositional zoning. SiO2 and tetrahedrally coordinated Si contents decrease, and Al2O3, AlIVand AlVIcontents increase gradually from core to rim. However, K2O, MgO and FeO contents basically remain unchanged from core to rim. According to P-T estimates obtained from geothermometers and barometers, combined with previous experimental data, the core belt (micro-area I) of phengite was formed at T=637–672°C and P=1.55–1.73 GPa, and the transitional belt (micro-area II) of the phengite were formed at T=594–654°C and P=1.35–1.45 GPa. Towards the rim belt (micro-area III), the temperature decreased slightly, but the pressure decreased rapidly with T=542–630°C and P=1.12–1.19 GPa. The P-T evolution path recorded by the compositional zoning of phengite is characterized by significant near-isothermal decompression, revealing that the gneiss has undergone high-pressure-ultrahigh-pressure metamorphism. The compositional zoning of the phengite in the albite gneiss may have formed in the geodynamic process of rapid exhumation in the Sulu ultrahigh-pressure metamorphic belt.

关键词： phengite compositional zoning gneiss genetic mechanism Donghai drill hole

Unusual high-density and saline aqueous inclusions in ultrahigh pressure metamor- phic rocks from Sulu terrane in eastern china

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chinese Science Bulletin 2003年第18期48卷 2018-2023页

作者： SHEN Kun zhang zeming A.M.van den Kerkhof XIAO Yilin xu zhiqin J.Hoefs institute of geological sciences of Shandong Jinan 250013China institute of geology CAGSBeijing 100037China Geoscience Center University GttingenGttingen 37077Germany

Primary high-density fluid inclusions were identified in garnet from ultrahigh pressure eclogite in the southern part of the Sulu terrane. They occur isolatedly or in cluster together with relatively low-density two-phase inclu-sions. The eutectic temperature of the inclusions is as low as ≤ -52℃. A bubble was nucleated in a liquid inclusion dur-ing the specific stage of cyclic cooling-heating runs, and the liquid-gas homogenization temperature was measured to be ≤-12.5℃. The composition of the inclusions modeled by the system CaCl2-NaCl-H2O, yields the fluid density of 1.27g/cm3 that corresponds to a pressure of ca. 2.4 GPa at thetemperature of peak eclogite-facies metamorphism, close tothe ultrahigh pressure metamorphic conditions. During theexhumation of the eclogite the inclusions reacted with thehost mineral, forming hydrous silicate minerals that resulted in lowering of the fluid density and its transformation to multi-phase inclusions.

关键词： ultrahigh pressure eclogite fluid inclusion microther-mometry isochore P-T path.

Geochemistry of UHP metamorphic rocks from the CCSD-main hole （0 - 2050 m）, Sulu orogenic belt, Eastern china

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Geochemistry of UHP metamorphic rocks from the CCSD-main hol...

Distinguishable Signature of UHP and Non-UHP Granitic Gneisses in the Sulu Terrane: Evidence from Mineral Inclusions in Zircons

2004年全国岩石学与地球动力学研讨会

作者： zhang zeming, xu zhiqin and Liu Fulai~1, Xiao Yilin~2, Liou J G ( Dept. of geological and Environmental sciences, Stanford University) and Jahn Bor-ming~3 (1. institute of geology, CAGS, beijing 100037 2. Geoscience Center, Geottingen University 3. Department of Geosciences, National Taiwan University)

＜正＞ The chinese Continental Scientific Drilling （CCSD） located near Maobei village, about 17 km southwest of Donghai, is targeted to drill a 5000-meter-deep main hole penetrating a tectonic slab of UHP metamorphic rocks. This project provides an advantageous and rare chance of collecting UHP rock samples continuously from the subsurface. The 0-2050 m of the CCSD-main hole consists of eclogite, orthogneiss, paragneiss, ultramafic rock and minor schist and quartzite. Eclogites are the principal lithological type, and mainly occur at

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Continental Dynamics 2001年第2期6卷 48-48页

作者： LIU Fulai xu zhiqin yang Jingsui zhang zeming S. MARUYAMA J. G. LIOU I.KATAYAMA S. MASAGO institute of geology Chinese Academy of Geological Science Beijing 100037 Dept. of Earth and Planetary sciences Tokyo Institute of Technology Tokyo Japan Dept. of geological and Environmental sciences Stanford University Stanford CA 94305

The pre-pilot drillhole CCSD-PP1 of the chinese Continental Scientific Drilling Project, with a depth of 432.08 m, is located in the Donghai area in the southeastern Sulu terrane. The core samples are comprised mainly of paragneiss, granitic gneiss and ultramafic rock with minor intercalated layers of phengite-bearing kyanite quartzite and eclogite.

关键词： UHP Distinguishable Signature of UHP and Non-UHP Granitic Gneisses in the Sulu Terrane Evidence from Mineral Inclusions in Zircons

再探青藏高原十大关键地学科学问题——《地质学报》百年华诞纪念

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地质学报 2022年第1期96卷 65-94页

作者：许志琴李广伟张泽明李海兵王岳军彭淼胡修棉易治宇郑碧海南京大学内生金属矿床成矿机制研究国家重点实验室南京大学地球科学与工程学院南京大学大陆动力学研究院江苏南京210043 中国地质科学院地质研究所北京100037 中山大学广东珠海510275 中国地质大学(北京) 北京100083

本文重新审视了青藏高原的关键科学问题,为解决板块构造理论的"登陆"难题提供新的线索,为理解板块汇聚边界的大陆岩石圈演化及其能源资源、地质灾害和全球环境效应提供新的思路。本文探讨了青藏高原如下十大关键地学问题:(1)印度大陆北... 详细信息

本文重新审视了青藏高原的关键科学问题,为解决板块构造理论的"登陆"难题提供新的线索,为理解板块汇聚边界的大陆岩石圈演化及其能源资源、地质灾害和全球环境效应提供新的思路。本文探讨了青藏高原如下十大关键地学问题:(1)印度大陆北漂模型;(2)印度-亚洲初始碰撞时限;(3)青藏高原的古特提斯造山作用;(4)古近纪喜马拉雅造山带的地壳缩短;(5)高喜马拉雅的深熔机制;(6)青藏高原隆升的时限和差异性;(7)构造-剥蚀-气候相互作用与南亚季风;(8)青藏高原关键矿产资源的分布与成因;(9)青藏高原的活动断裂带与孕震机制;(10)碰撞后的印度板块何去何从——深部动力学过程。这些问题可以作为当前研究青藏高原大陆动力学演化的重点方向。

关键词：青藏高原板块构造大陆动力学