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| 1 | Collision Tectonics between the Tarim Block(Basin)and the Northwestern Tibet Plateau:New Observations from a Multidisciplinary Geoscientific Investigation in the Western Kunlun Mountains显示文摘New results from deep seismic reflection profiling, wide-angle reflection-refraction profiling and broadband seismic experiments reveal that a series of south-dipping reflectors occur on the southern margin of the Tarim block (basin). However, it is these south-dipping structures that are intercepted by another series of north-dipping reflectors at depths from 30 to about 150 km beneath the foreland of the W Kunlun Mountains. No evidence from the above geophysical data as well as geochemical and surface geological data indicate the southward subduction of the Tarim block beneath the W Kunlun Mountains (NW Tibet plateau), forming the so-called “two-sided subduction” model for the Tibet plateau as proposed by previous studies. So the authors infer that the tectonic interaction between the Tarim block and the W Kunlun block was chiefly affected by a “horizontal compression in opposite directions”, which brought about “face-to-face contact” between these two lithospheric blocks and led to the thickening, shortening and densifying of the lithosphere. Hence a “delamination” was formed due to the gravitational instability created by the thickening and densifying; then alkaline basic volcanic rocks (mainly shoshonite series) was erupted along the northern margin of the Tibet plateau owing to the delamination. This inference for the formation of the alkaline basic volcanics has been confirmed by recent geochemical and petrological studies in Tibet, indicating that different contacts control different magmatic activities: the alkali basalts are always developed in the “horizontal shortening boundary (contact)” on the northern margin of the Tibet plateau, while the muscovite granite and two-mica granite (leucogranite) in the “subductional contact” on the southern margin of the Tibet plateau. | XIAO Xuchang LIU Xun GAO Rui Houn KAO LUO Zhaohua | 2001 | Acta Geologica Sinica(English Edition)2001，75，2： | 19 |
| 2 | Petrological, geochemical and chronological constraints for the tectonic setting of the Dongco ophiolite in Tibet显示文摘The Dongco ophiolite occurred in the middle-western segment of the Bangong-Nujiang suture zone. The thickness of the ophiolite suite is more than 5 km, which is composed, from bottom to top, of the mantle peridotite, mafic-ultramafic cumulates, basic sills (dykes) and basic lava and tectoni- cally emplaced in Jurassic strata (Mugagongru Group). The Dongco cumulates consist of dunite- troctolite-olivine-gabbro, being a part of DTG series of mafic-ultramafic cumulates. The basic lavas are characterized by being rich in alkali (Na2O+ K2O), TiO2, P2O5 and a LREE-rich type pattern dip- ping right with [La/Yb]=6.94―16.6 as well as a trace elements spider-diagram with normal anomaly of Th, Nb, Ta, Hf. Therefore, the Dongco basic lavas belong to ocean-island basalt (OIB) and dis- tinctly differ from mid-ocean ridge basalt (MORB) and island-arc basalt (IAB) formed in the plate convergence margin. The basic lavas have higher 87Sr/86Sr (0.704363―0.705007), lower 143Nd/144Nd (0.512708―0.512887) and εNd(t ) from +2.7―+5.8, indicating that they derive from a two-components mixing mantle source of depleted mantle (DM) and enriched mantle (EMI). From above it is ready to see that the Dongco ophiolite forms in oceanic island (OIB) where the mantle source is replaced by a large amount of enriched material, therefore it distinctly differs from these ophiolites formed in island-arc and mid-oecan ridge. Newly obtained SHRIMP U-Pb dating for zircon of the cumulate troctolite is 132 ± 3 Ma and whole-rock dating of ^(39)Ar/^(40)Ar for the basalt is 173.4 ± 2.7 Ma and 140.9 ± 2.8 Ma, indicating that the Dongco ophiolite formed at Early Cretaceous and the middle-western segment of the Bangong-Nujiang oceanic basin was still in the developing and evolving period at Early Cretaceous. | BAO PeiSheng XIAO XuChang SU Li WANG Jun | 2007 | Science China Earth Sciences2007，50，5： | 16 |
| 3 | Petrology, geochemistry and geochronology of the Zhongcang ophiolite, northern Tibet: implications for the evolution of the Bangong-Nujiang Ocean显示文摘Ophiolites are widespread along the Bangong-Nujiang suture zone, northern Tibet. However, it is still debated on the formation ages and tectonic evolution process of these ophiolites. The Zhongcang ophiolite is a typical ophiolite in the western part of the Bangong-Nujiang suture zone. It is composed of serpentinized peridotite, cumulate and isotropic gabbros, massive and pillow basalts, basaltic volcanic breccia, and minor red chert. Zircon SHRIMP Ue Pb dating for the isotropic gabbro yielded weighted mean age of 163.4 ± 1.8 Ma. Positive zircon ε Hf(t) values(+15.0 to +20.2) and mantle-like σ^(18)O values(5.29 ±0.21)% indicate that the isotropic gabbros were derived from a long-term depleted mantle source. The isotropic gabbros have normal mid-ocean ridge basalt(N-MORB) like immobile element patterns with high Mg O, low TiO_2 and moderate rare earth element(REE) abundances, and negative Nb,Ti, Zr and Hf anomalies. Basalts show typical oceanic island basalt(OIB) geochemical features, and they are similar to those of OIB-type rocks of the Early Cretaceous Zhongcang oceanic plateau within the Bangong-Nujiang Ocean. Together with these data, we suggest that the Zhongcang ophiolite was probably formed by the subduction of the Bangong-Nujiang Ocean during the Middle Jurassic. The subduction of the Bangong-Nujiang Tethyan Ocean could begin in the Earlye Middle Jurassic and continue to the Early Cretaceous, and finally continental collision between the Lhasa and Qiangtang terranes at the west Bangong-Nujiang suture zone probably has taken place later than the Early Cretaceous(ca. 110 Ma). | Yue Tang Qingguo Zhai Peiyuan Hu Xuchang Xiao Haitao Wang | 2018 | Geoscience Frontiers2018，9，5： | 9 |
| 4 | The Yadong-Golmud Geoscience Transect in the Qinghai-Tibet Plateau显示文摘On the basis of abundant geological and geophysical data. 6 terranes have been distinguished on theQinghai-Tibet Plateau. The plateau is a single integrated lithospheric unit although it is divided into blocks.With Amdo as a boundary. the crust may be divided into two parts with different crustal structures. The struc-ture in the southern part is complex, while that in the northern part is simple. The current study has revealedthat 8 factors such as slab subduction. overthrust and superimposition are responsible for crustal shorteningand thickening in the region. The uplift of this region is possibly due to northward compression of the Indianplate and southward compression of the Eurasian plate with the former predominating. The compression led tothe asthenospheric movements which were also influenced by thermal activity caused by doming at the bound-ary between the core and mantle. | Wu Gongjian Xiao Xuchang Li Tingdong Chinese Academy of Geological Sciences, Beijing Jia Zhongpeng | 1990 | Acta Geologica Sinica(English Edition)1990，64，2： | 3 |
| 5 | The Beila Ophiolite from the Bangong-Nujiang Suture Zone, Northern Tibetan Plateau显示文摘The Beila ophiolite is located in the middle part of the Bangong-Nujiang suture zone,northern Tibetan plateau.It is a complete ophiolite suite,and plays a key role in understanding the evolution of the Bangong-Nujiang suture zone,as well as the Meso-Tethys Ocean.The Beila ophiolite was composed of peridotite,serpentinite,gabbro,pillow basalt,and minor rodingite.Peridotites comprisemainlymedium–tocoarse–grained serpentinized harzburgites and minor plagioclase-bearing lherzolites and dunites.There are some felsic-ultramafic dykes within the peridotite and they are mainlypegmatoidal pyroxenites,coarse to fine-grained gabbros,and diabases.Gabbros included isotropic and cumulate gabbros,and they commonly contain minor pegmatoidal gabbros veins.Pillow basalts and basaltic andesites overlaid on the margin of the serpentinized peridotites.Rodingite occurs as lenses and/or dykes within the host serpentinized peridotites.Zircon SHRIMP U–Pb dating for two rodingite samples yielded the ages ranging from172 to 164 Ma.Whole-rock geochemical and zircon Hf isotopic data show that the Beila ophiolite shows SSZ-type ophiolite affinity.Finally,we suggest that the Beila ophiolite was generated in an initial subduction process at the middle Jurassic(164–172 Ma). | ZHAI Qingguo TANG Yue HU Peiyuan XIAO Xuchang WANG Haitao | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 2 |
| 6 | Paleozoic tectonic evolution of the Tianshan Orgen, northwestern China 显示文摘 | Gao Jun LiM Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，： | 1 |
| 7 | Paleozoic tectonic evolution of the Tianshan orogen, northernwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，14： | 1 |
| 8 | Paleozoic tectonic evolution of the Tianshan Orogen,northwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，： | 1 |
| 9 | Post-collisional Plio-Pleistocene shoshonitic volcanism in the western Kurdun Mountains, NW China: Geochemical constraints on mantle source characteristics and petrogenesis 显示文摘 | Zhaochong Zhang Xuchang Xiao Jun Wang | 2008 | Journal of Asian Earth Sciences2008，31，： | 1 |
| 10 | P-T path of high pressure low temperature rocks and tectonic implications in the western Tianshan Mountains,NW China显示文摘 | Gao Jun Klemd R Zhang Lifei Wang Zongxiu Xiao Xuchang | | 0，，： | 1 |
| 11 | Distribution of the Permian Monodiexodina in Karakorum and Kunlun and its Geological Significance显示文摘二叠的 fusulinoidean 类 Monodiexodina 广泛地在东方 Tethys 被散布。类可能是为在西北的中国的 Gondwana 的北边缘的重要指示物,但是这被争论。忍受 Monodiexodina 区域能与在高纬度的、凉爽 / 冷的水之间的对称的分布作为在北或南部的中间的纬度被恢复气候的领域和 paleotropical,温暖的水领域。在古代蒙古帝国旧都遗迹, Muztag 梨,和东方 Kunlun 山的 Buka Daban 梨的二叠的阶层适用 Monodiexodina 能与对方一起被相关。动物区系的分析和忍受 Monodiexodina 阶层的地层学的位置显示古代蒙古帝国旧都遗迹,东方 Kunlun,和帕米尔高原在中间的纬度在北半球的一个凉爽的适度的海区域被形成在期间二叠,而非在 Gondwana 边缘。 | YAO Jianxin WANG Naiwen XIAO Xuchang JI Zhansheng WU Guichun WU Zhenjie LI Boqin WANG Jun WANG Yong ZHAI Qingguo | 2009 | Acta Geologica Sinica(English Edition)2009，83，2： | 1 |
| 12 | Structure and evolution of the Himalaya-Tibet orogenic belt 显示文摘 | Allegre C J Courtillot V Tapponnier L Him A Mattauer M Coulon C Jaeger J J Achache J Scharer U Marcoux J Burg J L Girardeau J Armijo R Gariepy C Gopel C Li Tindong Xiao Xuchang Chang Chenfa Li Guangqin Lin Baoyu Teng Jiwen Wang Naiwen Chert Guoming Hart Tonglin Wang Xibin Den Wanming Sheng Huaibin Cao Yougong Zhou Ji Qiu Hongrong Bao Peisheng Wang Songchan Wang Bixiang Zhou Yaoxiu RonghuaXu | 1984 | Nature1984，307，5946： | 1 |
| 13 | Paleozoic tectonic evolution of the Tianshan Orogen,northwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，： | 1 |
| 14 | Summary of deep seismic probing of the lithospheric structure across the west Kunlun-Tarim-Tianshan显示文摘 | Gao Rui Xiao Xuchang Gao Hong | | 地质通报0，，： | 1 |
| 15 | The crustal evolution and uplift mechanism of the Qinghai-Tibet plateau显示文摘 | LI Tingdong XIAO Xuchang LI Guangcen | 1986 | Tectonophysics1986，127，34： | 1 |
| 16 | Paleozoic tectonic evolution of the Tianshan Orogen, northwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang Tang Yaoqing He Guoqi | 1998 | Tectonophysics1998，，1： | 1 |
| 17 | Discovery of Enclaves from Cenozoic PuluVolcanic Rocks in West Kunlun Mountains and ItsGeological Implications显示文摘In this paper, we present the occurrence and mineral components of the enclaves firstly discovered in the Cenozoic Pulu volcanic rocks in west Kunlun Mountains, and propose that the enclave is accumulated by fractional crystallization within high-level magma chamber. In addition, the chemical compositions of its primary magma are calculated. The calculated compositions are similar to those of the Kangxiwa volcanic rocks that belong to the same volcanic belt in the Pulu volcanic region, suggesting their origin from the same source region. However, the temperatures and oxygen fugacity of magmas at high-level magma chamber decreased along with fractional crystallization. | Zhang Zhaochong Xiao Xuchang Wang Jun Wang YongInstitute of Geology , Chinese Academy of Geological Sciences, Beijing 100037 | 2002 | Journal of China University of Geosciences2002，13，1： | 1 |
| 18 | Paleozoic tectonic evolution of the Tianshan Orogen,northern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，： | 1 |
| 19 | Paleozoic tectonic evolution of the Tianshan Orogen,northwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang | 1998 | Tectonophysics1998，287，： | 1 |
| 20 | Paleozoic tectonic evolution of the Tianshan Orogen, northwestern China显示文摘 | Gao Jun Li Maosong Xiao Xuchang Tang Yaoqing He Guoqi | 1998 | Tectonophysics1998，，1： | 1 |
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