1 Introduction Yangchun basin locates in the west of Guangdong Province,where more than 50 deposits have been discovered to date,including Xishan W-Sn deposit,Shilv Cu-Mo deposits,Tiantang Cu-Pb-Zn polymetallic
We have made careful field investigation and trench exploration to the Xishan fault system in west of Urumqi, and an integrated analysis in conjunction with data of deep seismic sounding. Our result suggests that unde...We have made careful field investigation and trench exploration to the Xishan fault system in west of Urumqi, and an integrated analysis in conjunction with data of deep seismic sounding. Our result suggests that under the SN-oriented compressive stress, the Xishan block moves steadily toward the Tianshan Mountains in south, resulting in southward thrust-slip and crustal shortening, particularly the southward thrust of the Xishan fault which serves as the main boundary in south. North of the Xishan fault are the Wangjiagou fault and Jiujiawan fault which are the secondary faults associated with the Xishan fault in generation. Both faults have slippage along horizons during the uplift of the Xishan block, and the Jiujiawan fault has also a component of normal faulting due to the influence of the Bogeda nappe structure. These two faults accommodate the fold deformation of the hanging wall of the Xishan fault, thus the Xishan fault-bounded swell is characterized by monocline. All secondary faults of the Xishan fault system constitute a common seismogenic structural system, so that their seismic hazards should be considered in an equal manner.展开更多
In mid-November, 2017, the project of New Energy Vehicle Engine Parts of Ching Ming （Wuxi） Metal Technology Co., Ltd. held a groundbreaking ceremony in Yangjian Town, Xishan District, Wuxi city. The project is inves...In mid-November, 2017, the project of New Energy Vehicle Engine Parts of Ching Ming （Wuxi） Metal Technology Co., Ltd. held a groundbreaking ceremony in Yangjian Town, Xishan District, Wuxi city. The project is invested by the renowned die-casting company - Hong Kong Ching Ming Group Limited, with a total investment of US$ 100 million. The project, covering an area of 84 thousand square meters （the building area is 80 thousand square meters）, will mainly focus its business on research, development, and production of key parts of new energy automotive engines.展开更多
The early Cretaceous trachytes of Donglingtai Formation in Xishan, Beijing are characterized by slight Eu negative anomaly and significant enrichment in LREE, LILE (Ba, K and Sr) and depletion of Nb-Ta-Ti, Th-U. These...The early Cretaceous trachytes of Donglingtai Formation in Xishan, Beijing are characterized by slight Eu negative anomaly and significant enrichment in LREE, LILE (Ba, K and Sr) and depletion of Nb-Ta-Ti, Th-U. These trachytes have been highly enriched by Sr and Nd isotopic signatures (87Sr/86Sr(t)= 0.70638～ 0.70672, εNd(t) = -16.3～ -15.7), overlapping Sr-Nd isotopic range of late Mesozoic mafic igneous rocks in the region. Taking into account Nb-Ta fractionation and high Zr/Sm ratio for these trachytes, we consider that the trachytes of Donglingtai Formation are derived from the garnet-bearing amphibolite in the lower crust composed of garnet + plagioclase ± amphibole ± pyroxene residual phases. On the basis of the melting experimental results of crustal materials and regional extensional tectonics during late Mesozoic, it is concluded that the thermal input from underplating basaltic melt results in the partial melting of lower continental crust to generate the trachytes of Donglingtai Formation. And the characteristics of high Sr and Ba for these trachytes suggest that part of underplating basalts should take a share in partial melting at least.展开更多
基金funded by the projects of the China Geological Survey [grant numbers 12120114005701 and No.DD20160029]
文摘1 Introduction Yangchun basin locates in the west of Guangdong Province,where more than 50 deposits have been discovered to date,including Xishan W-Sn deposit,Shilv Cu-Mo deposits,Tiantang Cu-Pb-Zn polymetallic
基金supported by Active Fault Detection and Earthquake Risk Estimation of Urumqi (1-4-31)Sub-topic of National Science and Technology Support Project (2006BAC13B010102)International Cooperation Key Project of Ministry of Science and Technology "Research on New Methods of Earthquake Prediction and Risk Estimation"(2004BFBA0005)
文摘We have made careful field investigation and trench exploration to the Xishan fault system in west of Urumqi, and an integrated analysis in conjunction with data of deep seismic sounding. Our result suggests that under the SN-oriented compressive stress, the Xishan block moves steadily toward the Tianshan Mountains in south, resulting in southward thrust-slip and crustal shortening, particularly the southward thrust of the Xishan fault which serves as the main boundary in south. North of the Xishan fault are the Wangjiagou fault and Jiujiawan fault which are the secondary faults associated with the Xishan fault in generation. Both faults have slippage along horizons during the uplift of the Xishan block, and the Jiujiawan fault has also a component of normal faulting due to the influence of the Bogeda nappe structure. These two faults accommodate the fold deformation of the hanging wall of the Xishan fault, thus the Xishan fault-bounded swell is characterized by monocline. All secondary faults of the Xishan fault system constitute a common seismogenic structural system, so that their seismic hazards should be considered in an equal manner.
文摘In mid-November, 2017, the project of New Energy Vehicle Engine Parts of Ching Ming （Wuxi） Metal Technology Co., Ltd. held a groundbreaking ceremony in Yangjian Town, Xishan District, Wuxi city. The project is invested by the renowned die-casting company - Hong Kong Ching Ming Group Limited, with a total investment of US$ 100 million. The project, covering an area of 84 thousand square meters （the building area is 80 thousand square meters）, will mainly focus its business on research, development, and production of key parts of new energy automotive engines.
基金This study is being financially supported by Chinese Academy of Science(KZCX1-107 and KZCX2-104)National Nature Science Foundation(No.40073011)
文摘The early Cretaceous trachytes of Donglingtai Formation in Xishan, Beijing are characterized by slight Eu negative anomaly and significant enrichment in LREE, LILE (Ba, K and Sr) and depletion of Nb-Ta-Ti, Th-U. These trachytes have been highly enriched by Sr and Nd isotopic signatures (87Sr/86Sr(t)= 0.70638～ 0.70672, εNd(t) = -16.3～ -15.7), overlapping Sr-Nd isotopic range of late Mesozoic mafic igneous rocks in the region. Taking into account Nb-Ta fractionation and high Zr/Sm ratio for these trachytes, we consider that the trachytes of Donglingtai Formation are derived from the garnet-bearing amphibolite in the lower crust composed of garnet + plagioclase ± amphibole ± pyroxene residual phases. On the basis of the melting experimental results of crustal materials and regional extensional tectonics during late Mesozoic, it is concluded that the thermal input from underplating basaltic melt results in the partial melting of lower continental crust to generate the trachytes of Donglingtai Formation. And the characteristics of high Sr and Ba for these trachytes suggest that part of underplating basalts should take a share in partial melting at least.
