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The Nature of the West Junggar Basement:Evidence from Magmatic and Detrital Zircon U-Pb Ages

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 691-692页

作者： DUAN Fenghao LI Yongjun ZHI Qian yang gaoxue School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China School of Earth Science and Resources Chang'an UniversityXi'an 710054China Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits MNRXi'an 710054China

Objective West Junggar,which is located in the southwestern segment of the Central Asian Orogenic Belt(CAOB),is an important tectonic unit in the evaluation and examination of the largest continental accretion on Earth,playing a significant role in understanding the tectonic evolution and crustal growth within the orogenic belt(Xiao and Santosh,2014).However,no precise record of ancient continental blocks is found in West Junggar,owing to the extensive coverage and later structural reconstructions.

关键词： continental tectonic crustal

Geochronological and Geochemical Constrains on Petrogenesis of the Jietebutiao A-type Granite in West Junggar,Xinjiang

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 131-147页

作者： yang gaoxue LI Yongjun TONG Lili ZHANG Bing TIAN Zhixian yang Baokai Ministry of Education Key Laboratory of Western China's Mineral Resources and Geological EngineeringSchool of Earth Science and ResourcesChang'an University Number 7 Geological Brigade Xinjiang Bureau of Geology and Mineral Resource Exploration

Late Paleozoic post-collisional granitoids are widespread in West Junggar, as well as northern Xinjiang. As a representative of those intrusions, the Jietebutiao granite occurs in the southwestern margin of the West Junggar （northwest China）, and is mainly composed of mid-coarse- grained monzogranite and syenogranite. In the present study, we report the results of high-precision zircon laser-ablation-inductively-coupled plasma mass-spectrometry U-Pb dating on the Jietebutiao granite for the first time, and yield weighted mean 2~~pb/23SU ages of 287 ＋ 9 Ma and 278 ~ 3 Ma for monzogranite and syenogranite, respectively. The Jietebutiao granite has a pronounced A-type affinity; it is metaluminous to slightly peraluminous; has a high-K calc-alkaline composition; high concentrations of Na20 ＋ I（20, varying from 6.8 to 8.5 wt%; high FeOt/MgO; 10 000Ga/AI ratios, a low CaO, MgO, and TiO2 content; enriched in some large ion lithophile elements （LILE, such as Rb and Th） and high field strength elements （HFSE, such as Zr, Hf, and Y）; and depleted in Sr, Ba, and Ti. In addition, the granite has a relatively high rare earth element （REE） content （except for Eu）, with significant negative Eu anomalies （Eu/Eu＊ = 0.01-0.72）, and showing slight tetrad REE patterns and non-charge and radius controlled （CHARAC） trace element behavior. Petrographic, geochemical, and geochronological data suggest that the parental magma of Jietebutiao intrusions are of mixed origin, and are most probably formed by the interaction between the lower crust- and mantle-derived magmas in the Early Permian post-collisional tectonic setting. The basaltic magmas underplated and interacted with the lower crust that was dominated by deeply buried arc （and back-arc basin） series and the oceanic crust formed in the Paleozoic, and then triggered the partial melting of the juvenile lower crust, producing voluminous granitic melts and forming the Jietebutiao A2-type monzogranites, with the lithospheric mantle progres

关键词： A-type granite geochronology petrogenesis post-collisional West Junggar

A New Discovery of Early Carboniferous Gabbros in the Southern Chinese Altai: Evidence for Ridge Subduction

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1308-1309页

作者： WANG Zuopeng LI Yongjun yang gaoxue ZHANG Yuling CHAO Wendi School of Earth Science and Resources Chang'an UniversityXi'an 710054China Shaanxi Yanchang Petroleum(Group)Corp.Ltd. Yan'anShaanxi 716099China Northwest Geological Exploration Institute of China Metallurgical Geology Bureau Xi'an 710119China

Objective The Chinese Altai as a key part of the Central Asian Orogenic Belt is characterized by numerous outcrops of Paleozoic granitoids and minor mafic plutons (Fig. 1a). It is widely accepted that Devonian ridge subduction played an important role in the tectonic evolution of the Chinese Altai. However, Carboniferous magmatism related to ridge subduction has received little attention. Moreover。

关键词： Carboniferous Altai tectonic

The Discovery of ～310 Ma Back-Arc Basin Basalt in the West Junggar,Xinjiang,NW China and its Geological Significance

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Acta Geologica Sinica(English Edition) 2019年第2期93卷 496-498页

作者： ZHI Qian LI Yongjun yang gaoxue DUAN Fenghao TONG Lili School of Earth Science and Resources Chang'an University Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits MNR

Objective Mafic magmas can form in different tectonic settings with various geochemical characteristics depending on their mantle sources. Basalts generated in back-arc basins provide valuable perspectives on mantle s... 详细信息

关键词： Ma Back-Arc West Junggar Xinjiang Geological Significance

Oceanic Island Basalts from the Darbut and Karamay Ophiolitic Mélange in West Junggar(NW China): Product of a Middle Devonian Mantle Plume?

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 105-106页

作者： yang gaoxue LI Yongjun TONG Lili yang Baokai School of Earth Science & Resources Chang’an University

The Central Asian Orogenic Belt （CAOB） is an immense accretionary orogen and is an important site of Phanerozoic crustal growth （Fig. la; Sengor et al., 1993; Jahn, 2004; Windley et al., 2007; Xiao et al., 2008;Saf...

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Petrogenesis of Early Carboniferous Alkaline Basalt from the Wusun Mountain:Implications for Tectonic Evolution of the Western Yining Block,NW China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1128-1138页

作者： WANG Zuopeng LV Yan LI Hai LI Yongjun ZHOU Yanlong LI Ganyu yang gaoxue School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China School of Earth Science and Engineering Xi'an Shiyou UniversityXi'an 710054China School of Earth Science and Resources Chang'an UniversityXi'an 710054China Hebei GEO University Shijiazhuang 050031China

Late Paleozoic volcanic rocks are well exposed in the Yining Block,NW China,and are predominately composed of andesites,rhyolites and volcaniclastics as well as minor *** of the petrology,whole-rock geochemistry and zircon U-Pb dating for the Early Carboniferous alkaline basalts from Wusun Mountain,western Yining Block,constrains their petrogenesis and tectonic *** alkaline basalts consist mainly of plagioclases,mostly albite and labradorite,as well as clinopyroxenes and olivines;zircon U-Pb dating indicates their formation at ca.350 ***,the basaltic samples have low SiO_(2)contents,and high TiO_(2),Al_(2)O_(3)and alkaline contents,coupled with high Na_(2)O/K_(2)O ratios,displaying an alkaline basalt *** show remarkable LILE enrichment and HFSE ***,these samples have relatively high TFe_(2)O_(3),MgO,and Mg#values as well as Ni and Cr,relatively high Sm/Yb and U/Th,suggesting origination from a mantle source metasomatized by slab *** formed in a transitional tectonic setting from arc to intraplate,showing a typical affinity of back-arc basin *** alkaline basalts were likely generated in a nascent back-arc extension setting resulting from slab rollback of the southern Tianshan oceanic lithosphere.A bidirectional subduction model seems more reasonable for the evolution of the southern Tianshan *** new data will provide a new tectonic model for Late Paleozoic tectonic evolution of the western Yining Block.

关键词： petrology geochemistry isotopic dating alkaline basalt slab rollback Yining Block CAOB

LA-ICP-MS Zircon U-Pb Age of Newly Discovered Hatu Tectonic Mélange in the West Junggar, Xinjiang, NW China

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1317-1318页

作者： DUAN Fenghao LI Yongjun ZHI Qian yang gaoxue LUO Xin LI Yuhang State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Science and Resources Chang'an UniversityXi'an 710054China Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits MNRXi'an 710054China

Objective The West Junggar, situated in the southwestern segment of the Central Asian Orogenic Belt, is considered to be an important area for Phanerozoic crustal growth owing to the excellent exposures of diverse rock types and multiple generations of structures and magmatic rocks. Recently, a new tectonic mélange has been identified in the southern West Junggar during geological mapping at a scale of 50000.

关键词： Xinjiang crustal West

Alkaline Basalts in the Bayingou Ophiolitic Melange of Northern Tianshan Mountains:Origination from Seamounts?

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Acta Geologica Sinica(English Edition) 2016年第1期90卷 380-381页

作者： yang gaoxue LI Yongjun TONG Lili LI Ganyu SHEN Rui LI Zhao School of Earth Science and Resources Chang'an UniversityXi'an 710054ShaanxiChina Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits MLRXi'an 710054ShaanxiChina

Objective The Bayingou ophiolitic Tianshan Mountains of melange is located in Northerm the southern Central Asian Orogenic Belt which is the largest accretionary oroger among the European, Siberian, Tarim and North Chine cratons. The Bayingou ophiolitic melange provide a critical geological record for unraveling regional tectonic histor） and testing different tectonic models. However, previous studies were mainly concentrated on geochronology, rock combination, structural feature and geochemistry ol ophiolite, with little attention to oceanic island basalts in the Bayingou ophiolitic melange. Therefore, in this study, we focus on pillow basalts from ophiolitic melange.

关键词： Alkaline Basalts in the Bayingou Ophiolitic Melange of Northern Tianshan Mountains

中亚造山带核心区蛇绿混杂岩中洋岛玄武岩成因探讨

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科学通报 2016年第34期61卷 3684-3697页

作者：杨高学长安大学地球科学与资源学院国土资源部岩浆作用成矿与找矿重点实验室西安710054

中亚造山带核心区(哈萨克斯坦山弯及翼部)发育新元古代晚期至早石炭世数条蛇绿混杂岩带,它们大多发育典型的海山岩石组合,即枕状玄武岩、火山角砾岩、礁灰岩、滑塌堆积岩、陆源碎屑岩等.结合其特有的构造特征,初步重建了中亚造山带核心... 详细信息

中亚造山带核心区(哈萨克斯坦山弯及翼部)发育新元古代晚期至早石炭世数条蛇绿混杂岩带,它们大多发育典型的海山岩石组合,即枕状玄武岩、火山角砾岩、礁灰岩、滑塌堆积岩、陆源碎屑岩等.结合其特有的构造特征,初步重建了中亚造山带核心区古海山火山地层格架.在地球化学上,构成古海山的火山岩主要为碱性玄武岩,TiO_2含量高,富集轻稀土元素,无明显Nb,Ta,Ti负异常,具有典型洋岛玄武岩特征.Nd,Sr及Pb同位素组成显示岩浆源区有富集组分的参与并受到流体交代的影响.总体上与地幔柱有关的典型海山Louisville,Ontong Java及Hawaiian的玄武岩地球化学特征一致,但不发育高镁苦橄岩或科马提质玄武岩.中亚造山带核心区洋岛玄武岩的来源可能至少有两种:(1)海山在俯冲带被刮削保留在增生楔中;(2)直接来自地幔交代岩的部分熔融,也不排除循环洋壳部分熔融和陆源沉积物参与的可能.可见中亚造山带洋岛玄武岩的物质来源多并发生复杂的壳幔相互作用,这与现代大洋中地幔柱活动及海山的发展演化类似.

关键词：洋岛玄武岩海山地幔柱蛇绿岩中亚造山带