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Geosciences, Multidisciplinary
Zhenzhen Wang, Zhidan Zhao, Xuping Li, Paul D. Asimow, Dong Liu, Xuanxue Mo, Ningyuan Qi, Yan Tang, Qing Wang, Di-Cheng Zhu, Liangliang Zhang, Lawangin Sheikh
Summary: The coexistence of Cretaceous adakitic and A-type granitoids in southern Tibet provides fundamental constraints on subduction of the Neo-Tethyan oceanic plate and crustal growth processes. The Chanang intrusive rocks show characteristics of mafic magma fractionation and mixing of mantle wedge and juvenile lower crust magmas, indicating an episode of rollback of the Neo-Tethyan slab in the late Cretaceous. The high-temperature and relatively H2O-rich environment in this region led to the formation of aluminous A(2)-type granites and adakitic rocks.
Article
Geosciences, Multidisciplinary
Xiaoshuang Chen, Haijin Xu, Qiang Liu, Shuyuan Xiang
Summary: This study presents a comprehensive investigation of the Mayum alkaline complex in the southern Lhasa subterrane, including whole-rock geochemistry, zircon U-Pb ages, and Sr-Nd-Hf isotopes. The results reveal that the alkaline rocks were generated through partial melting of the juvenile lower crust and experienced fractional crystallization. The associated mafic microgranular enclaves (MMEs) likely originated from a mantle source and underwent magma mixing with the host alkaline rocks. These findings provide insights into the timing and dynamic mechanism of the Neo-Tethyan oceanic slab breakoff at approximately 53 Ma.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Zeliang Ma, Guangwei Li, Zhiqin Xu, Barry Kohn, Yilong Zheng
Summary: The Xigaze fore-arc basin in southern Tibet provides crucial information on the subduction of the Neo-Tethys and subsequent collision between India and Asia. The new thermochronology dataset sheds light on the burial and exhumation history in the central part of the basin, offering insights into the Cenozoic collisional processes between the Indian and Asian plates.Variations in exhumation history, stratigraphic exposure, and structural characteristics between the eastern and central Xigaze fore-arc basin suggest spatially different responses along the southern Asian margin due to variations in compressional stresses within the India-Asia collisional zone.
Article
Geology
Wei Dan, Qiang Wang, William M. White, Xian-Hua Li, Xiu-Zheng Zhang, Gong-Jian Tang, Quan Ou, Lu-Lu Hao, Yue Qi
Summary: The study reports on a ca. 239 Ma mafic dike swarm intruded in the Southern Qiangtang terrane, central Tibet, generated on the passive continental margin. The dikes are tholeiitic basalts with unique geochemical characteristics, coeval with a back-arc basin formation due to Paleo-Tethys oceanic slab rollback. Enhanced slab-pull forces from ocean-ridge subduction are proposed as an unrecognized mechanism for lower-plate passive-margin magmatism.
Article
Geosciences, Multidisciplinary
Weiwei Xue, Xiumian Hu, Anlin Ma, Eduardo Garzanti, Wendong Liang, Lulu Hao, Qiang Wang
Summary: The controversial history of Indian subduction beneath Asia is crucial to understand the Himalayan orogeny and the geodynamic process of continental subduction in general. This study presents new information from the Oligocene-Pliocene Shiquanhe Basin in the Tibetan Plateau, indicating the development of an orogen-parallel rift in southern Tibet during the Oligocene Epoch. The subsidence of twin basins in this area may have been caused by the steepening subducting Indian continental slab or by the passage of a wave of dynamic topography during continued subduction.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Xiang Sun, Yongjun Lu, Qiang Li, Ruyue Li
Summary: The E-trending Gangdese porphyry copper belt in southern Tibet is influenced by subducted Indian continental materials, with mineralizing intrusions derived from subduction-modified Tibetan lower crust and contributions from fluids released by the Indian plate and mafic melts from mantle metasomatized by subducted Indian continental materials. The involvement of isotopically ancient Indian continental materials increased from east to west along the belt, reflecting a shallower angle of the downgoing Indian slab from east to west.
Article
Geosciences, Multidisciplinary
Chao Wang, Lin Ding, Fulong Cai, Liyun Zhang, Zhenyu Li, Yahui Yue
Summary: This study reports the tectonic setting of the Tethyan Himalaya in southern Tibet during the Triassic period and its relationship with the opening of the Neo-Tethys Ocean and the breakup of Gondwana. The researchers analyzed volcanic rocks in the region and found that they were formed in a passive continental margin setting. The findings support the hypothesis that the Neo-Tethys Ocean opened in a passive pattern and that the breakup of Gondwana was initiated by lithospheric thinning.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Wenbin Zhao, Zhengfu Guo, Guodong Zheng, Daniele L. Pinti, Maoliang Zhang, Jujing Li, Lin Ma
Summary: The role of the subducting Indian slab in carbon cycling and volcanic activity in the Lhasa terrane is examined through the analysis of hydrothermal gases. It is found that the continuous subduction of the Indian continental slab has led to high Th-U contents and increased mantle-helium input in the Lhasa terrane. The isotopic trends and carbon isotopic ratios suggest significant carbonate input from the mantle. The study highlights the control of subducting lithosphere on the distribution of volatiles in the Lhasa terrane.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geology
Qiushi Zhou, Rui Wang
Summary: The Gangdese belt in southern Tibet has uneven distribution of porphyry deposits, with the middle-east segment containing the majority of the deposits. However, recent discoveries in the eastern end have attracted attention. Seismic imaging shows different subduction angles in different parts of Tibet, with the eastern segment showing a shallow dip of subduction. Major and trace element data of Miocene and Oligocene rocks indicate a correlation between distance to the suture and zircon U-Pb ages, as well as differences in compatible elements and isotope signatures. The formation of the discovered deposits is suggested to be related to the reactivation of pre-enriched arc root materials.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Faqiao Li, Juxing Tang, Nan Wang, Zhibo Liu, Yang Song, Jing Zhang, Xudong Ma, Bin Fu, Haifeng Li, Songhao Han
Summary: This study reports the geochronology, geochemistry, and isotopic data of Early Cretaceous granitoids within the Baingoin batholith. The data suggest that these granitoids were derived from unbalanced melting in a heterogeneous source area and formed in an extensional tectonic setting produced by the initial and continuous rollback of a northward-subducting slab of the NTO.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2022)
Article
Geochemistry & Geophysics
Haibo Yang, Xiaoping Yang, Dickson Cunningham, Xiongnan Huang, Zongkai Hu, Huili Yang
Summary: The study reveals that the JJF system is a late Pleistocene to Holocene oblique sinistral-slip normal fault connecting two Quaternary left-lateral fault systems. The Jiujing Basin is the largest and best developed of three parallel NE-striking transtensional basins within an evolving sinistral transtensional duplex, beginning to form around 5.5 Ma.
Article
Geosciences, Multidisciplinary
Wei Wang, Qing-guo Zhai, Pei-yuan Hu, Yue Tang
Summary: By studying felsic rocks in central Tibet, we have summarized the subduction and closure history of the Meso-Tethys Ocean from the Early Jurassic to the Late Cretaceous. Our findings provide insight into the temporospatial variations in magmatism and the timing of ocean closure. This research is significant for understanding the geological evolution of the Meso-Tethys Ocean.
Article
Geochemistry & Geophysics
Xiang Sun, Pete Hollings, Yong-Jun Lu
Summary: The Zhunuo porphyry copper deposit in southern Tibet is characterized by complex intrusive rocks and multiple stages of mineralization, with different magmatic intrusions and ore deposition contributing to the formation of the copper mineralization zone. The diverse ages and types of various rocks and veins also show a multi-stage mineralization characteristic.
MINERALIUM DEPOSITA
(2021)
Article
Geochemistry & Geophysics
Ming Lei, Jianlin Chen, Chaopeng Li
Summary: This study investigates the crustal thickening in southern Tibet during the Eocene period by analyzing geochronological and geochemical data of Eocene granitic plutons. The results suggest that the thickened crust was mainly caused by melting of juvenile and ancient continental crust as well as underplating of mafic magmas. This thickened crust resulted in surface uplift in the region, which had a significant impact on the Cenozoic evolution of the Indian Monsoon system.
Article
Geochemistry & Geophysics
Duo Wang, Hong Chang, Gongming Yin, Fei Han, Zebin Mao, Jinhua Du, Wenjun Zheng, Xulong Wang
Summary: By using optically stimulated luminescence dating technique, it was found that the Gyaring Co fault experienced a southeastward decrease in slip rate during the late Quaternary period. Although the slip rate in the middle-west segment slowed down slightly, the overall slip rate remained relatively stable. This fault may contribute to distributed deformation in the Tibetan Plateau region.
Article
Geochemistry & Geophysics
Devon A. Orme, William R. Guenthner, Andrew K. Laskowski, Peter W. Reiners
EARTH AND PLANETARY SCIENCE LETTERS
(2016)
Article
Geochemistry & Geophysics
Fulong Cai, Lin Ding, Andrew K. Laskowski, Paul Kapp, Houqi Wang, Qiang Xu, Liyun Zhang
EARTH AND PLANETARY SCIENCE LETTERS
(2016)
Article
Geology
Devon A. Orme, Andrew K. Laskowski
JOURNAL OF SEDIMENTARY RESEARCH
(2016)
Article
Geochemistry & Geophysics
Andrew K. Laskowski, Paul Kapp, Jeff D. Vervoort, Lin Ding
Article
Geosciences, Multidisciplinary
Fulong Cai, Lin Ding, Wei Yao, Andrew K. Laskowski, Qiang Xu, Ji'en Zhang, Kyaing Sein
Article
Geochemistry & Geophysics
Andrew K. Laskowski, Paul Kapp, Lin Ding, Clay Campbell, XiaoHui Liu
Article
Geosciences, Multidisciplinary
Andrew K. Laskowski, Paul Kapp, Fulong Cai
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2018)
Article
Geochemistry & Geophysics
Andrew K. Laskowski, Peter G. DeCelles, George E. Gehrels
Article
Geochemistry & Geophysics
Alan D. Chapman, Andrew K. Laskowski
Article
Geology
Andrew K. Laskowski, Devon A. Orme, Fulong Cai, Lin Ding
Article
Geochemistry & Geophysics
Yaofei Chen, Lin Ding, Zhenyu Li, Andrew K. Laskowski, Jinxiang Li, Upendra Baral, Muhammad Qasim, Yahui Yue
Article
Geosciences, Multidisciplinary
William B. Burke, Andrew K. Laskowski, Devon A. Orme, Kurt E. Sundell, Michael H. Taylor, Xudong Guo, Lin Ding
Summary: The study presents new data from the Dajiamang Tso rift to investigate synchronous convergence extension dynamics in the Tibetan-Himalayan orogenic belt, showing the evolution of the India-Asia suture zone. Results indicate a switch from compression to extension around 16 Ma, with possible crustal thinning prior to India-Eurasia collision onset and subsequent crustal thickening until the early Miocene. Geophysical observations suggest modern crustal thickness is likely maintained by underthrusting Indian lithosphere and upper plate extension after E-W extension began around 16 Ma.
Article
Geosciences, Multidisciplinary
Andrew K. Laskowski, Lin Ding, Fu-Long Cai, Yao-Fei Chen, Song-Lin He
GEOSCIENCE FRONTIERS
(2018)