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Monazite and titanite U-Pb ages of granitoids from the North Qinling Terrane: Implications for the subduction of the Shangdan Ocean and accretionary processes

文献类型：期刊论文

作者Qin, Zheng-wei1,2,5; Siebel, Wolfgang5; Fu, Jian-ming1,2; Wang, Hao4; Bao, Bo1,2; Yu, Yu-shuai1,2; Shan, Liang1,2; Lu, You-yue1,2; Wu, Yuan-Bao3
刊名LITHOS
出版日期2023-12-01
卷号460页码:17
ISSN号0024-4937
关键词Qinling orogen Monazite Titanite U-Pb geochronology Slab roll-back
DOI10.1016/j.lithos.2023.107386
英文摘要The early Paleozoic granitoids of the North Qinling Terrane have been widely viewed as the products of an Andean-type margin related to the long-lasting subduction of the Proto-Tethys (Shangdan) ocean. However, the spatial and temporal distributions of the arc granitoids coupled with subduction-accretion processes are still a subject of debate. Here, we report LA-ICP-MS U-Pb monazite and titanite ages and trace element concentrations for granites and a paragneiss from the North Qinling Terrane. The results, together with data in the literatures, are used to reconstruct the magmatic evolution related to the subduction of the Shangdan ocean during the early Paleozoic. As revealed by U-Pb geochronology, subduction-related magmatism in the southern belt of the North Qinling magmatic arc (NQMA) was most active between 423 and 404 Ma, and therefore younger and shorter than previously speculated. The ages are in agreement with a metamorphic monazite U-Pb age (415 Ma) obtained from the paragneiss, suggesting that crustal anatexis of the NQMA was contemporaneous with the magmatism. Overall, magmatism in the NQMA moved progressively from north to south. This southward propagation is consistent with roll-back of the Shangdan oceanic slab and transition from an oceanic arc into a back-arc basin setting. The timing of magmatism and migmatization as well as high-temperature granulite metamorphism in the NQMA signifies that the Shangdan ocean retreated to the North Qinling Unit before c. 423 Ma. Monazites from NQMA generally show HREE depletion and negative Eu anomalies, and some display the REE tetrad effect. These geochemical features indicated that the NQMA granites were highly fractionated. In addition, the abrupt changes in REE compositions displayed by titanites probably record a mixing event with a mafic magma along the Shangdan suture zone.
WOS关键词LA-ICP-MS ; IN-SITU ANALYSIS ; CENTRAL CHINA ; TECTONIC EVOLUTION ; OROGENIC BELT ; TONGBAI OROGEN ; TRACE-ELEMENT ; NEOTETHYAN SUBDUCTION ; ZIRCON GEOCHRONOLOGY ; ISOTOPE COMPOSITIONS
资助项目NSF of China[41802069] ; Geological Survey of China[DD20221689] ; Geological Survey of China[PMGR202111]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:001097287700001
资助机构NSF of China ; NSF of China ; Geological Survey of China ; Geological Survey of China ; NSF of China ; NSF of China ; Geological Survey of China ; Geological Survey of China ; NSF of China ; NSF of China ; Geological Survey of China ; Geological Survey of China ; NSF of China ; NSF of China ; Geological Survey of China ; Geological Survey of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/110666]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Qin, Zheng-wei; Wu, Yuan-Bao
作者单位1.China Geol Survey, Wuhan Ctr Geol Survey, Wuhan 430205, Peoples R China
2.China Geol Survey, Res Ctr Granit Diagenesis & Mineralizat, Wuhan 430205, Peoples R China
3.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
5.Freiburg Univ, Fac Environm & Nat Resources, D-79104 Freiburg, Germany
推荐引用方式
GB/T 7714		 Qin, Zheng-wei,Siebel, Wolfgang,Fu, Jian-ming,et al. Monazite and titanite U-Pb ages of granitoids from the North Qinling Terrane: Implications for the subduction of the Shangdan Ocean and accretionary processes[J]. LITHOS,2023,460:17.
APA Qin, Zheng-wei.,Siebel, Wolfgang.,Fu, Jian-ming.,Wang, Hao.,Bao, Bo.,...&Wu, Yuan-Bao.(2023).Monazite and titanite U-Pb ages of granitoids from the North Qinling Terrane: Implications for the subduction of the Shangdan Ocean and accretionary processes.LITHOS,460,17.
MLA Qin, Zheng-wei,et al."Monazite and titanite U-Pb ages of granitoids from the North Qinling Terrane: Implications for the subduction of the Shangdan Ocean and accretionary processes".LITHOS 460(2023):17.

入库方式： OAI收割

来源：地质与地球物理研究所

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