Role of chalcophile element fertility in the formation of the eastern Tethyan post-collisional porphyry Cu deposits

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Hongda Hao, Jung-Woo Park, Yuan-Chuan Zheng, Jiwon Hwang
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Abstract

Post-collisional porphyry Cu deposits are genetically related to the magmas generated by partial melting of sulfide-bearing lithosphere fertilized by subduction components. The ore-forming magmas are suggested to be enriched in chalcophile elements compared to the barren magmas. However, the chalcophile element contents in the post-collisional magmas and its role in controlling the porphyry ore formation remain unclear. Platinum-group element (PGE) geochemistry has been used as a proxy for Cu and Au. In this study, we report PGE concentrations of representative post-collisional ore-associated and barren suites in the eastern Tethyan metallogenic domain. The ore-associated suites have moderate Pd and Pt contents ranging from ~ 0.05 to 0.5 ppb, which are comparable to those associated with giant porphyry systems in continental arc settings. In contrast, most of the barren suites have systematically lower Pd and Pt concentrations below ~ 0.1 and 0.05 ppb, respectively. Numerical models show that the ore-forming magmas, derived from partial melting of subduction-modified lithospheric mantle, have precipitated a small amount of sulfide phases during magma differentiation, leading to the moderate depletion of Pd and Pt in the ore-associated suites. Although the sulfide segregation has depleted highly chalcophile element contents, the ore-forming magmas contain sufficient Cu to form porphyry Cu deposits. This contrasts with the barren suites, which mainly originated from partial melting of the lower crust and contain about five times lower Cu contents, unfavorable for porphyry Cu mineralization. We suggest that moderate chalcophile element contents in the ore-associated magmas have increased the porphyry ore-forming potential in the eastern Tethyan domain.

Abstract Image

东哲西亚碰撞后斑岩铜矿床形成过程中亲铝元素肥度的作用
碰撞后斑岩型铜矿床在遗传学上与含硫化物岩石圈部分熔融后产生的岩浆有关。与贫瘠岩浆相比,成矿岩浆富含亲铬元素。然而,碰撞后岩浆中的亲铝元素含量及其在控制斑岩矿形成中的作用仍不清楚。铂族元素地球化学一直被用作铜和金的替代元素。在本研究中,我们报告了东哲伦成矿域中具有代表性的碰撞后伴矿和贫瘠岩套的铂族元素浓度。与矿石相关的岩套具有适中的钯和铂含量,从~ 0.05 ppb到0.5 ppb不等,与大陆弧环境中巨型斑岩系统的钯和铂含量相当。相比之下,大多数贫瘠岩相的钯和铂含量较低,分别低于约 0.1 和 0.05 ppb。数值模型显示,成矿岩浆来自俯冲改造的岩石圈地幔的部分熔融,在岩浆分异过程中析出了少量硫化物相,导致与矿石有关的岩浆中钯和铂的适度贫化。虽然硫化物偏析使亲铝元素含量降低,但成矿岩浆中仍含有足够的铜元素,可形成斑岩型铜矿床。这与贫瘠岩浆形成鲜明对比,贫瘠岩浆主要来源于下地壳的部分熔融,含铜量比贫瘠岩浆低约五倍,不利于斑岩型铜矿的形成。我们认为,与矿石伴生的岩浆中适度的亲铝元素含量增加了东哲伦盆地斑岩成矿的潜力。
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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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