DOI: 10.1007/s00531-014-0997-6
Scopus记录号: 2-s2.0-84896546342
论文题名: The Late Mesozoic tectonic evolution and magmatic history of west Zhejiang, SE China: Implications for regional metallogeny
作者: Qiu J.-T. ; Yu X.-Q. ; Santosh M. ; Li P.-J. ; Zhang D.-H. ; Xiong G.-Q. ; Zhang B.-Y.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 3 起始页码: 713
结束页码: 735
语种: 英语
英文关键词: Magmatic oxygen fugacity
; Regional metallogeny
; Tectonic evolution
; Zhe-Gan-Wan
; Zhejiang
Scopus关键词: geochemistry
; geochronology
; magmatism
; Mesozoic
; metallogenesis
; mineralization
; ore deposit
; tectonic evolution
; tectonic setting
; China
; Yangtze Platform
; Zhejiang
英文摘要: The granitoids and related polymetallic mineralization in the Zhejiang Province at the southeast margin of the Yangtze Block in China provide an important window to evaluate metallogeny associated with convergent margin magmatism. Here, we present geochronological, geochemical, and isotopic data from the granitic rocks of west Zhejiang, to constrain the timing of transformation of the tectonic setting of this region from volcanic arc to intra-plate during Late Mesozoic and its bearing on regional metallogeny. The granitic rocks in west Zhejiang can be geochemically subdivided into two groups. The first group is characterized by relatively steep rare earth element (REE) patterns with slight Eu anomalies, high Sr, low Yb, and negative Nb-Ta-Ti (NTT) anomalies, indicating a volcanic arc environment with a thickened crust in a convergent setting. The second group is featured by flat REE patterns with prominent negative Eu anomalies, low Sr, high Yb, and weak NTT anomalies, suggesting an intra-plate extensional environment with a thin crust. The geochronology of granitic rocks in west Zhejiang, combined with ages of regional tectonic basins and nappe structures, constrains the timing of the tectonic transformation to be in the range from 150 to 140 Ma. Sr-Nd isotopic data and a positive correlation displayed by oxygen fugacity (fO2), and La/Sm and Ba/Th ratios (proxies of subducted sediments and slab dehydration fluids) suggest that the high oxygen fugacity is probably related to the melting of subducted sediments and slab dehydration. From 180 to 80 Ma, due to the increasing dip angle of the subducted Izanagi Plate, the volcanic arc belt migrated oceanward, leaving most of the interior of Zhejiang Province under an intra-plate environment where insufficient subducted components and upwelling mantle generated reduced magmas which were not favorable for Cu-Mo mineralization. Our model provides a plausible explanation for the absence of Cu-Mo porphyry deposits in the adjacent region of Zhejiang, Jiangxi, and Anhui provinces (Zhe-Gan-Wan region) after 140 Ma. © 2014 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896546342&doi=10.1007%2fs00531-014-0997-6&partnerID=40&md5=0b27ca563e133ab135b556665da8e19a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70412
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Earth Sciences and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing, 100083, China; National Key Laboratory of Science and Technology on Remote Sensing Information and Image Analysis, Beijing Research Institute of Uranium Geology, China National Nuclear Corporation, Beijing, 100029, China; No. 3 Team of Geological Survey of Zhejiang, Jinhua, 321017, China
Recommended Citation:
Qiu J.-T.,Yu X.-Q.,Santosh M.,et al. The Late Mesozoic tectonic evolution and magmatic history of west Zhejiang, SE China: Implications for regional metallogeny[J]. International Journal of Earth Sciences,2014-01-01,103(3)