| Early Cretaceous adakite from the Atlas porphyry Cu-Au deposit in Cebu Island, Central Philippines: Partial melting of subducted oceanic crust | |
Deng, Jianghong1,2,3; Yang, Xiaoyong3; Qi, Huasheng3; Zhang, Zhao-feng5; Mastoi, Abdul Shakoor3,6; Berador, Al Emil G.7; Sun, Weidong1,2,4
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| 2019-07-01 | |
| 发表期刊 | ORE GEOLOGY REVIEWS
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| ISSN | 0169-1368 |
| 卷号 | 110页码:20 |
| 通讯作者 | Yang, Xiaoyong(xyyang555@163.com) ; Sun, Weidong(weidongsun@gig.ac.cn) |
| 摘要 | In the Philippine island arc system, there are widely developed Cenozoic arc volcanic rocks, adakites and large Cu-Au deposits. Besides, only two early Cretaceous adakitic intrusions have been found in the entire Philippines so far, i.e., the Lutopan Diorite and the adjacent Kansi diorites in Cebu Island, Central Philippines. The Lutopan Diorite (diorite to quartz diorite in lithology) is the ore-forming intrusion of the giant Atlas porphyry Cu-Au deposit, which is the only Cretaceous porphyry deposit in the Philippines. In this study, geochronology and geochemistry of the Lutopan Diorite in the Carmen pit of Atlas porphyry Cu-Au deposit are investigated in detail, by comparing them with the previously studied Early Cretaceous Kansi diorites and arc volcanic rocks in Cebu Island, to reveal the petrogenesis and magma sources. The Carmen diorites are characterized by moderate SiO2 and MgO contents, coupled with high Na2O and low K2O contents, LREE-enriched and listric REE distribution patterns, low Yb and Y contents, high Sr contents and thereby high Sr/Y ratios, and low (Sr-87/Sr-66)i (0.7037-0.7038), typical of modern island arc adakites. Zircon U-Pb ages of the Carmen diorites are 109 Ma - 107 Ma in the Early Cretaceous, which is identical with that of the Kansi diorite in the north within error. Both the Carmen and Kansi diorites were formed in intra-oceanic island arc settings. The Carmen diorites show listric REE patterns and low Nb/Ta, high Zr/Sm ratios, suggesting they are formed by partial melting of subducted oceanic crust in amphibolite facies, which is different from the garnet amphibolite- to amphibole eclogitemelting genesis of the Kansi diorites. There is a small amount of subducted sediments in the magma source of Carmen diorite, as further revealed by epsilon(Nd)(t) (+7.1 to +10.6), zircon epsilon(Hf)(t) (+3.3 to +3.9) values, and low Th/U ratios. The Carmen adakitic magma did not undergo significant interaction with mantle peridotite during magma ascent as indicated by the moderate MgO content and Mg# value, and quite low Cr and Ni contents, distinguished from the Kansi diorite (high-Mg adakite) that have high MgO, Mg#, and Cr and Ni contents. We suggest that the nearly contemporary Lutopan Diorite and Kansi diorite are two independent Early Cretaceous adakitic intrusions in Cebu Island, although they are both closely associated with Cu-Au mineralization. The slab-melting genesis and high oxygen fugacities of the Lutopan Diorite are the most important factors to cause Cu enrichment in the magma, which is necessary to form the giant Atlas porphyry Cu-Au deposit. |
| 关键词 | Adakite Philippines Porphyry Cu deposit Early Cretaceous Amphibolite melting |
| DOI | 10.1016/j.oregeorev.2019.102937 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key R&D Program of China[2016YFC0600404] ; National Natural Science Foundation of China[41673040] ; National Natural Science Foundation of China[41803002] ; National Natural Science Foundation of China[91328204] ; National Natural Science Foundation of China[41373007] ; China Postdoctoral Science Foundation[2015M582003] ; Fundamental Research Funds for the Central Universities ; National Key R&D Program of China[2016YFC0600404] ; National Natural Science Foundation of China[41673040] ; National Natural Science Foundation of China[41803002] ; National Natural Science Foundation of China[91328204] ; National Natural Science Foundation of China[41373007] ; China Postdoctoral Science Foundation[2015M582003] ; Fundamental Research Funds for the Central Universities |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:000474320900001 |
| 出版者 | ELSEVIER SCIENCE BV |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/161969 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Yang, Xiaoyong; Sun, Weidong |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Marine Geol & Environm, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Shandong, Peoples R China 3.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 6.Univ Sindh, Ctr Pure & Appl Geol, Jamshoro 76080, Pakistan 7.Mines & Geosci Bur Reg VII MGB 7, Geosci Div, Mandaue 6014, Philippines |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Deng, Jianghong,Yang, Xiaoyong,Qi, Huasheng,et al. Early Cretaceous adakite from the Atlas porphyry Cu-Au deposit in Cebu Island, Central Philippines: Partial melting of subducted oceanic crust[J]. ORE GEOLOGY REVIEWS,2019,110:20. |
| APA | Deng, Jianghong.,Yang, Xiaoyong.,Qi, Huasheng.,Zhang, Zhao-feng.,Mastoi, Abdul Shakoor.,...&Sun, Weidong.(2019).Early Cretaceous adakite from the Atlas porphyry Cu-Au deposit in Cebu Island, Central Philippines: Partial melting of subducted oceanic crust.ORE GEOLOGY REVIEWS,110,20. |
| MLA | Deng, Jianghong,et al."Early Cretaceous adakite from the Atlas porphyry Cu-Au deposit in Cebu Island, Central Philippines: Partial melting of subducted oceanic crust".ORE GEOLOGY REVIEWS 110(2019):20. |
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