Middle Neoproterozoic (ca. 705–716 Ma) arc to rift transitional magmatism in the northern margin of the Yangtze Block: constraints from geochemistry, zircon U–Pb geochronology and Hf isotopes
作者： Ruirui Wang , Zhiqin Xu , M. Santosh , Xianbing Xu , Qi Deng
DOI: 10.1016/J.JOG.2017.07.003
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摘要: Abstract The South Qinling Belt in Central China is an important window to investigate the Neoproterozoic tectono-magmatic processes along northern margin of Yangtze Block. Here we present whole-rock geochemistry, zircon U-Pb geochronology and Lu-Hf isotopes a suite Middle intrusion from Wudang Uplift Qinling. Zircon LA-ICP-MS ages reveal that these rocks were formed at ca. 705–716 Ma. Geochemical features indicate felsic magmatic are I-type granitoids, belong calcic- calc-alkaline series, display marked negative Nb, Ta Ti anomalies. Moreover, enrichment light rare earth elements (LREEs) large ion lithophile (LILEs), combined with depletion heavy (HREEs) support have affinity typical arc Andean-type active continental margins. REE patterns highly moderately fractionated, (La/Yb) N = 5.13–8.10 meta-granites, 2.32–2.35 granodiorite. granitoids wide range e Hf (t) values (−29.91 14.76) two-stage model (696–3482 Ma). We suggest Ma sourced different degrees magma mixing between partial melting overlying mantle wedge triggered by hydrous fluids released subducted materials crustal melting. hybrid magmas emplaced shallow crust accompanied assimilation fractional crystallization (AFC). Both isotopic geochemical data arc. These as well contemporary A-type granite may mark transitional tectonic regime rifting, probably related slab rollback during oceanic subduction beneath
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sci-hub.se 参考文章(115)
Yunpeng Dong, M. Santosh, Tectonic architecture and multiple orogeny of the Qinling Orogenic Belt, Central China Gondwana Research. ,vol. 29, pp. 1- 40 ,(2016) , 10.1016/J.GR.2015.06.009
William V. Boynton, Cosmochemistry of the rare earth elements: meteorite studies. Developments in Geochemistry. ,vol. 2, pp. 63- 114 ,(1984) , 10.1016/B978-0-444-42148-7.50008-3
Ruiying Zhang, Yong Sun, Xu Zhang, Wenhao Ao, M. Santosh, Neoproterozoic magmatic events in the South Qinling Belt, China: Implications for amalgamation and breakup of the Rodinia supercontinent Gondwana Research. ,vol. 30, pp. 6- 23 ,(2016) , 10.1016/J.GR.2015.06.015
Yan Xia, Xisheng Xu, Guochun Zhao, Lei Liu, Neoproterozoic active continental margin of the Cathaysia block: Evidence from geochronology, geochemistry, and Nd–Hf isotopes of igneous complexes Precambrian Research. ,vol. 269, pp. 195- 216 ,(2015) , 10.1016/J.PRECAMRES.2015.08.006
Thomas Bader, Lothar Ratschbacher, Leander Franz, Zhao Yang, Mandy Hofmann, Ulf Linnemann, Honglin Yuan, The heart of China revisited, I. Proterozoic tectonics of the Qin mountains in the core of supercontinent Rodinia Tectonics. ,vol. 32, pp. 661- 687 ,(2013) , 10.1002/TECT.20024
Yuri Amelin, Anatoly N Zaitsev, Precise geochronology of phoscorites and carbonatites: The critical role of U-series disequilibrium in age interpretations Geochimica et Cosmochimica Acta. ,vol. 66, pp. 2399- 2419 ,(2002) , 10.1016/S0016-7037(02)00831-1
Min Peng, Yuanbao Wu, Shan Gao, Hongfei Zhang, Jing Wang, Xiaochi Liu, Hujun Gong, Lian Zhou, Zhaochu Hu, Yongsheng Liu, Honglin Yuan, Geochemistry, zircon U–Pb age and Hf isotope compositions of Paleoproterozoic aluminous A-type granites from the Kongling terrain, Yangtze Block: Constraints on petrogenesis and geologic implications Gondwana Research. ,vol. 22, pp. 140- 151 ,(2012) , 10.1016/J.GR.2011.08.012
Jian-Ping Zheng, Jian-Wei Li, Jun-Hong Zhao, Mei-Fu Zhou, Dan-Ping Yan, Reappraisal of the ages of Neoproterozoic strata in south China; no connection with the Grenvillian Orogeny Geology. ,vol. 39, pp. 299- 302 ,(2011) , 10.1130/G31701.1
Hervé Martin, Adakitic magmas: modern analogues of Archaean granitoids Lithos. ,vol. 46, pp. 411- 429 ,(1999) , 10.1016/S0024-4937(98)00076-0
Xuan-Ce Wang, Xian-Hua Li, Wu-Xian Li, Zheng-Xiang Li, Ca. 825 Ma komatiitic basalts in South China: First evidence for >1500 °C mantle melts by a Rodinian mantle plume Geology. ,vol. 35, pp. 1103- 1106 ,(2007) , 10.1130/G23878A.1