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The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes
Qingyan Tang;  Mingjie Zhang;  Yuekun Wang;  Yunsheng Yao;  Li Du;  Liemeng Chen;  Zhongping Li
2017
Source PublicationChemical Geology
Volume469Pages:47-59
Abstract

The Lichi Melange in the Coastal Range, eastern Taiwan, is considered as sheared forearc sequences. However, the age of these sequences is still uncertain, and their significance for the arc-continent collision has been overlooked. Based on field surveys and micropaleontological analysis, four independent biostratigraphic units ranging from <8.5 to 3.0Ma are discerned in the Lichi Melange. These units are obviously older than the remnant forearc sequences in the east (3.4-1.2Ma), supporting the interpretation that the Lichi Melange arose from the shearing of the lower forearc basin sequences. The stratigraphy also suggests that the older forearc strata (<8.5-3.4Ma) were deformed and uplifted as a bathymetric high similar to the Huatung Ridge in the western North Luzon Trough by arcward back thrusting before 3.4Ma, while sedimentation continued in the remnant forearc basin in the east during 3.4-1.2Ma. The older forearc strata possess vitrinite reflectance values even lower than those of the remnant forearc sequences, which also supports that they were uplifted by back thrusting and therefore did not experience significant burial. Neodymium isotope analysis shows that the <8.5-6.4Ma forearc sediments were sourced from both the volcanic arc and the accretionary prism, indicating the emergence of the accretionary prism within <8.5-6.4Ma. It might have resulted from the underplating of thinned continental crust and provides a good time constraint for the onset of arc-continent collision. The post 6.4Ma forearc sediments were mainly derived from the accretionary prism, reflecting its constant uplift and large-scale exposure.

KeywordOrigins C-hf-sr-nd Isotopes Volatile Compositions Mafic-ultramafic Rocks Sulfide Deposit Emeishan Lip Sw China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8030
Collection矿床地球化学国家重点实验室
Affiliation1.Key Lab of Mineral Resources in Western China (Gansu), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
2.Key Lab of Petroleum Resource, Gansu Province/Key Lab of Petroleum Resources Research, CAS, Lanzhou 730000, China
3.State Key Lab of Ore Deposit Geochemistry, Institute of Geochemistry, CAS, Guiyang 550002, China
Recommended Citation
GB/T 7714
Qingyan Tang;Mingjie Zhang;Yuekun Wang;Yunsheng Yao;Li Du;Liemeng Chen;Zhongping Li. The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes[J]. Chemical Geology,2017,469:47-59.
APA Qingyan Tang;Mingjie Zhang;Yuekun Wang;Yunsheng Yao;Li Du;Liemeng Chen;Zhongping Li.(2017).The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes.Chemical Geology,469,47-59.
MLA Qingyan Tang;Mingjie Zhang;Yuekun Wang;Yunsheng Yao;Li Du;Liemeng Chen;Zhongping Li."The origin of the Zhubumafic-ultramafic intrusion of the Emeishan large igneous province, SW China: Insights from volatile compositions and C-Hf-Sr-Nd isotopes".Chemical Geology 469(2017):47-59.
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