Original Article
Neoproterozoic (750–711 Ma) Tectonics of the South Qinling Belt, Central China: New Insights from Geochemical, Zircon U-Pb Geochronological, and Sr-Nd Isotopic Data from the Niushan Complex
Shuo WANG,
Yunhua LIU,
Benzhao YANG,
Le TAN,
Xiaoyan LI,
Nan DENG,
Shuo WANG
School of Earth Sciences and Resources, Chang'an University, Xi'an, 710054 China
Search for more papers by this authorCorresponding Author
Yunhua LIU
School of Earth Sciences and Resources, Chang'an University, Xi'an, 710054 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorBenzhao YANG
Geological Team No. 1 of Shaanxi Bureau of Geology and Mineral Resources, Ankang, Shannxi, 725000 China
Search for more papers by this authorLe TAN
Geological Team No. 1 of Shaanxi Bureau of Geology and Mineral Resources, Ankang, Shannxi, 725000 China
Search for more papers by this authorXiaoyan LI
Longshou Mine of Jinchuan Group Co., Ltd, Jinchang, Gansu, 737100 China
Search for more papers by this authorNan DENG
Xi'an Mineral Resources Survey Center, China Geological Survey, Xi'an, 710100 China
Search for more papers by this authorShuo WANG,
Yunhua LIU,
Benzhao YANG,
Le TAN,
Xiaoyan LI,
Nan DENG,
Shuo WANG
School of Earth Sciences and Resources, Chang'an University, Xi'an, 710054 China
Search for more papers by this authorCorresponding Author
Yunhua LIU
School of Earth Sciences and Resources, Chang'an University, Xi'an, 710054 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorBenzhao YANG
Geological Team No. 1 of Shaanxi Bureau of Geology and Mineral Resources, Ankang, Shannxi, 725000 China
Search for more papers by this authorLe TAN
Geological Team No. 1 of Shaanxi Bureau of Geology and Mineral Resources, Ankang, Shannxi, 725000 China
Search for more papers by this authorXiaoyan LI
Longshou Mine of Jinchuan Group Co., Ltd, Jinchang, Gansu, 737100 China
Search for more papers by this authorNan DENG
Xi'an Mineral Resources Survey Center, China Geological Survey, Xi'an, 710100 China
Search for more papers by this authorAbout the first author:
WANG Shuo, male, born in 1984 in Changchun, Jilin Province; doctor; graduated from Jilin University; associate professor of the School of Earth Science and Resources, Chang'an University. He is now interested in the study of regional mineralization. E-mail: [email protected].
About the corresponding author:
LIU Yunhua, male, born in 1965 in Meishan, Sichuan Province; Ph.D. in geology; graduated from Jilin University; professor of the School of Earth Science and Resources, Chang'an University. He is now interested in the study of tectonic evolution and mineralization. E-mail: [email protected].
Abstract
The Xiejiaba and Fuqiangbei plutons form part of the newly identified Neoproterozoic Niushan complex, which is located in the southern South Qinling belt (SQB). The plutons are compositionally similar, were emplaced at 750–711 Ma, and provide insights into Neoproterozoic tectonism within the South Qinling belt. The Xiejiaba pluton contains diorite, quartz diorite, granodiorite, and granite phases, all of which are sub-alkaline and have variable major element compositions with negative correlations between SiO2 and MgO, TFe2O3, Al2O3, CaO, TiO2 and P2O5. These rocks are enriched in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and have negative Nb, Ta, P and Ti anomalies, all of which are indicative of arc-type magmatism. The Fuqiangbei pluton contains granitoids that are compositionally similar to the rocks in the Xiejiaba pluton. Samples from these plutons have similar ɛNd(t) values (1.24–5.99) but very variable (87Sr/86Sr)i values (0.7010–0.7054). Combining these data with the geochemical data for these rocks suggests that the magmas that formed the Niushan complex were derived from the crust–mantle boundary. This, combined with the results of previous research, suggests that the transition from low pressure-low temperature to low pressure-high temperature conditions within a subduction zone caused melting during a period of late subduction and backarc extension. This constrain the timing of subduction within the South Qinling belt and the northern Yangtze Block (YB) to 750–711 Ma, with this Neoproterozoic subduction associated with an ocean to the north overprinting an existing continental rift-type tectonic setting within the northern margin of the Yangtze Block and the South Qinling belt.
Supporting Information
Supplementary data to this article can be found online at http://doi.org/10.1111/1755-6724.14926.
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