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Early Cretaceous high-Mg adakites associated with Cu-Au mineralization in the Cebu Island, Central Philippines: Implication for partial melting of the paleo-Pacific Plate
Deng, Jianghong1; Yang, Xiaoyong1; Qi, Huasheng1; Zhang, Zhao-Feng2; Mastoi, Abdul Shakoor1; Sun, Weidong3,4,5
2017-08-01
发表期刊ORE GEOLOGY REVIEWS
卷号88页码:251-269
文章类型Article
摘要Early Cretaceous arc volcanic rocks, diorite intrusions and an associated large porphyry deposit occur in the Cebu Island, Central Philippines. In this paper, we studied the diorite porphyries associated with Cu-Au mineralization in the Kansi region, where Early Cretaceous arc volcanic rocks are widely distributed. Zircon U-Pb age reveals that the diorites were formed at ca. 110 Ma, close to the formation age of Lutopan diorites in the famous Atlas porphyry Cu-Au deposit (109-101 Ma), and younger than those of the arc volcanics in this region (126-118 Ma). The Kansi diorites and Lutopan diorites are both talc-alkaline high-Mg adakites with high Sr/Y ratios. Their major elements define similar variation trends in Harker diagrams, suggesting that they were probably generated from a uniform source but experienced different degree of partial melting or fractional crystallization. The Kansi diorites are characterized by LREE enrichment, HREE depletion, no Eu negative anomaly, with enrichment of Pb, Sr, Zr and Hf and depletion of Nb, Ta, and Ti. They are probably generated by the partial melting of subducted oceanic crust, followed by a certain degree of mantle interaction and crustal contamination. The highly depleted Sr-Nd-Pb-Hf isotopes of the Kansi diorites are close to the Amami Plateau basalt and tonalite, indicating the dominance of a Pacific-type MORB in the source. The Cu-Au mineralization-related Kansi diorites are characterized by high oxygen fugacities more than Delta FMQ +2, indicating quite a good potential for porphyry Cu-Au mineralization in the region. Finally, in our tectonic model, the successive generation of arc volcanic rocks and adakites in the Cebu Island are responses to the subduction and rollback of the paleo-Pacific Plate to the proto-Philippine Sea Plate (PSP) in the Early Cretaceous. (C) 2017 Elsevier B.V. All rights reserved.
关键词Adakite Slab Melting Porphyry Cu Deposit Paleo-pacific Plate Subduction Cebu Island Central Philippines
DOI10.1016/j.oregeorev.2017.05.006
收录类别SCI
语种英语
WOS记录号WOS:000405252200014
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/137030
专题深海极端环境与生命过程研究中心
作者单位1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
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Deng, Jianghong,Yang, Xiaoyong,Qi, Huasheng,et al. Early Cretaceous high-Mg adakites associated with Cu-Au mineralization in the Cebu Island, Central Philippines: Implication for partial melting of the paleo-Pacific Plate[J]. ORE GEOLOGY REVIEWS,2017,88:251-269.
APA Deng, Jianghong,Yang, Xiaoyong,Qi, Huasheng,Zhang, Zhao-Feng,Mastoi, Abdul Shakoor,&Sun, Weidong.(2017).Early Cretaceous high-Mg adakites associated with Cu-Au mineralization in the Cebu Island, Central Philippines: Implication for partial melting of the paleo-Pacific Plate.ORE GEOLOGY REVIEWS,88,251-269.
MLA Deng, Jianghong,et al."Early Cretaceous high-Mg adakites associated with Cu-Au mineralization in the Cebu Island, Central Philippines: Implication for partial melting of the paleo-Pacific Plate".ORE GEOLOGY REVIEWS 88(2017):251-269.
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