Geochemical constraints on the petrogenesis of Cenozoic adakitic porphyries in West Papua, Indonesia: implications for the metallogeny of the Grasberg Cu-Au deposit and associated tectonic evolution
文献类型：期刊论文
| 作者 | Yang, Xiaoyong1,4; Qi, Huasheng1,4; Deng, Jianghong3; Zhang, Zhengwei2 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2025-12-01 |
| 卷号 | 294页码:21 |
| 关键词 | Cenozoic monzonite porphyries Petrogenesis of adakitic rocks LA-ICP-MS U-Pb ages Sr-Nd-Pb-Hf isotopes High oxygen fugacity and fertilization Grasberg porphyry Cu-Au deposit A geodynamic model West Papua |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2025.106809 |
| 通讯作者 | Yang, Xiaoyong(xyyang@ustc.edu.cn) ; Qi, Huasheng(qhs87@mail.ustc.edu.cn) |
| 英文摘要 | The Cenozoic porphyries in the Grasberg area host a supergiant Cu-Au porphyry deposit in West Papua, Indonesia. These rocks display adakite-like geochemical features, including high Sr/Y and (La/Yb)N ratios, high Al2O3 and K2O, low Y and Yb, and radiogenic Pb isotopes, distinguishing them from typical lower crustal melts. Integrated zircon U-Pb-Hf, whole-rock Sr-Nd-Pb isotopes, and trace element data indicate that three monzonite porphyries crystallized at 3.06 +/- 0.19 Ma, 2.93 +/- 0.16 Ma, and 2.86 +/- 0.17 Ma. They show negative whole-rock epsilon Nd(t) (-9.8 to -8.5) and zircon epsilon Hf(t) (-20 to -1), high Ce4+/Ce3+ ratios (11.4-9056.7), and elevated oxygen fugacity, consistent with formation from oxidized, metal-fertile magmas.We propose that Grasberg porphyries formed by partial melting of an enriched, metasomatized lithospheric mantle mixed with melts from ancient lower continental crust. Mantle-derived magmas supplied heat, initial Cu-Au, high water content, and elevated fO(2), while crustal melts imparted adakitic signatures. Regional tectonics involved collisional delamination of the Australian continental lithosphere (starting similar to 6 Ma), upwelling of hot asthenosphere, and decompression of stretched lithospheric mantle, promoting partial melting and magma mixing. Subsequent strike-slip faulting created pathways for shallow emplacement of adakitic monzonites, generating Cu-Au mineralization.High Ce4+/Ce3+ ratios and delta S-34 values of pyrite and chalcopyrite indicate a magmatic source and strongly oxidized conditions, explaining the exceptional metal enrichment. This study establishes a geodynamic framework for the formation of igneous intrusions and the supergiant Grasberg Cu-Au deposit in a post-collisional, thin back-arc setting. |
| WOS关键词 | EASTERN CHINA CONSTRAINTS ; U-PB ISOTOPE ; NEW-GUINEA ; ARC MAGMAS ; IRIAN-JAYA ; CONTINENTAL COLLISION ; OXIDATION-STATE ; COPPER-GOLD ; LOWER CRUST ; ERTSBERG DISTRICT |
| 资助项目 | Natural Science Foun-dation of China[42230801] ; Key Research Program of the Chinese Academy of Sciences[ZDRW-CN-2021-3] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001585728300001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203476]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Yang, Xiaoyong; Qi, Huasheng |
| 作者单位 | 1.Univ Sci & Technol China, State Key Lab Lithospher & Environm Coevolut, Hefei 230026, Peoples R China 2.Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550002, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Xiaoyong,Qi, Huasheng,Deng, Jianghong,et al. Geochemical constraints on the petrogenesis of Cenozoic adakitic porphyries in West Papua, Indonesia: implications for the metallogeny of the Grasberg Cu-Au deposit and associated tectonic evolution[J]. JOURNAL OF ASIAN EARTH SCIENCES,2025,294:21. |
| APA | Yang, Xiaoyong,Qi, Huasheng,Deng, Jianghong,&Zhang, Zhengwei.(2025).Geochemical constraints on the petrogenesis of Cenozoic adakitic porphyries in West Papua, Indonesia: implications for the metallogeny of the Grasberg Cu-Au deposit and associated tectonic evolution.JOURNAL OF ASIAN EARTH SCIENCES,294,21. |
| MLA | Yang, Xiaoyong,et al."Geochemical constraints on the petrogenesis of Cenozoic adakitic porphyries in West Papua, Indonesia: implications for the metallogeny of the Grasberg Cu-Au deposit and associated tectonic evolution".JOURNAL OF ASIAN EARTH SCIENCES 294(2025):21. |
入库方式： OAI收割
来源：海洋研究所
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