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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
2019-07-01
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume110Pages:20
Corresponding AuthorYang, Xiaoyong(xyyang555@163.com) ; Sun, Weidong(weidongsun@gig.ac.cn)
AbstractIn 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.
KeywordAdakite Philippines Porphyry Cu deposit Early Cretaceous Amphibolite melting
DOI10.1016/j.oregeorev.2019.102937
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000474320900001
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/161969
Collection海洋地质与环境重点实验室
Corresponding AuthorYang, Xiaoyong; Sun, Weidong
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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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