The formation of porphyry copper deposits
文献类型：CNKI期刊论文
| 作者 | Weidong Sun ; Jin-tuan Wang; Li-peng Zhang; Chan-chan Zhang; He Li; Ming-xing Ling; Xing Ding; Cong-ying Li; Hua-ying Liang
|
| 发表日期 | 2017-03-15 |
| 出处 | Acta Geochimica
 |
| 关键词 | Porphyry Cu deposit Oxygen fugacity Slab melting Sulfide Sulfate Solubility |
| 英文摘要 | Copper is a moderately incompatible chalcophile element.Its behavior is strongly controlled by sulfides.The speciation of sulfur is controlled by oxygen fugacity.Therefore,porphyry Cu deposits are usually oxidized(with oxygen fugacities > AFMQ +2)(Mungall 2002;Sun et al.2015).The problem is that while most of the magmas at convergent margins are highly oxidized,porphyry Cu deposits are very rare,suggesting that high oxygen fugacity alone is not sufficient.Partial melting of mantle peridotite even at very high oxygen fugacities forms arc magmas with initial Cu contents too low to form porphyry Cu deposits directly(Lee et al.2012;Wilkinson 2013).Here we show that partial melting of subducted young oceanic slabs at high oxygen fugacity(>AFMQ +2) may form magmas with initial Cu contents up to >500 ppm,favorable for porphyry mineralization.Pre-enrichment of Cu through sulfide saturation and accumulation is not necessarily beneficial to porphyry Cu mineralization.In contrast,remelting of porphyritic hydrothermal sulfide associated with iron oxides may have major contributions to porphyry deposits.Thick overriding continental crust reduces the "leakage" of hydrothermal fluids,thereby promoting porphyry mineralization.Nevertheless,it is also more difficult for ore forming fluids to penetrate the thick continental crust to reach the depths of 2—4 km where porphyry deposits form. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | No.IS-2308 from GIGCAS,which is supported by the NSFC(No.91328204,41090374, 41121002) ; the Chinese Academy of Sciences(KZCXl-YW-15) |
| 卷 | v.36期:01页:11-17 |
| 语种 | 英文; |
| 分类号 | P618.41 |
| ISSN号 | 2096-0956 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/189355]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.CASKeyLaboratoryofMineralogyandMetallogeny,GuangzhouInstituteofGeochemistry,TheChineseAcademyofSciences 2.CASCenterforExcellenceinTibetanPlateauEarthSciences,TheChineseAcademyofSciences 3.CenterofDeepSeaResearch,InstituteofOceanology,ChineseAcademyofSciences 4.StateKeyLaboratoryofIsotopeGeochemistry,GuangzhouInstituteofGeochemistry,TheChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Weidong Sun,Jin-tuan Wang,Li-peng Zhang,et al. The formation of porphyry copper deposits. 2017. |
入库方式： OAI收割
来源：海洋研究所
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