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首页> 外文期刊>Contributions to Mineralogy and Petrology >Source component mixing controls the variability in Cu and Au endowment along the strike of the Eastern Andean Cordillera in Peru
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Source component mixing controls the variability in Cu and Au endowment along the strike of the Eastern Andean Cordillera in Peru

机译：源分量混合控制Cu和Au沿着秘鲁东部的击球的变异性

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摘要

Mississippian arc magmatic suites of the Au-rich Pataz and Cu-dominated Montanitas regions in Peru reveal distinct modes of magmatic-hydrothermal petro- and metallogenesis. The distinction is remarkable due to their broad contemporaneity (336-322 Ma), arc-parallel position, and close distance ( 50 km) to each other. In both arc regions, petrography, geochemistry, and the tectonic setting of magmatic suites suggest a rapid switch from syn-collisional/compressional to post-collisional/extensional (with 'A(2)-type' signature) emplacement regime. Rocks of the Au-rich Pataz region originate from mixed sources with a contribution from the mantle (epsilon Hf 0 and delta O-18 of similar to 5.3%) and assimilated old crust (variously low eHf and delta O-18 5.3%). The ultimate source of Au in the mineralised Pataz batholith was oxidised (fO(2) at FMQ buffer; based on zircon trace chemistry) and alkali-, LILE- and HFSE-enriched, most likely represented by the metasomatised mantle. The synextensional emplacement of the relatively reduced (Delta FMQ 0), but unmineralised, A(2)-type suite involved assimilation of reduced crust. Associated, reduced, magmatic-hydrothermal fluids infiltrated the Au-bearing batholith suite and effectively mobilised and transported and concentrated Au. In the Montanitas region, rocks are oxidised (Delta FMQ 0) and dominantly mantle derived without significant incorporation of crustal material. Samples from the Cu-mineralised suites indicate the additional contribution of a delta O-18 5.3% source, potentially melted layer-2 gabbro. In addition, the elevated whole-rock La/Yb and Sr/Y ratios are compatible with minor addition of slab-derived material, which may have enhanced Cu endowment in this region. Late-magmatic, oxidised fluids derived from the younger A(2)-type suite controlled Cu mobilisation and concentration, while Au behaved largely refractory. In general terms, it is postulated that source mixing in continental arcs is a first-order control of contrasting Cu and Au endowment and that sequential intrusion processes facilitate late-magmatic-hydrothermal mobilisation and concentration of specific metal assemblages.
机译：密西西比州古老的帕拉兹和秘鲁的Cu-主导的Montanitas地区密西西比亚宏观套房揭示了岩浆 - 水热石油和金属发生的明显模式。由于其宽的同时性（336-322 mA），电弧平行位置和彼此关闭距离（50km），因此区分显着。在弧区域，岩石，地球化学和岩浆套件的构造设置中，建议一种快速切换从SYN碰撞/压缩到碰撞后/延伸（具有'A（2）型'签名）驻制方案。富裕的帕兹地区的岩石来自混合来源，源于披风的贡献（epsilon hf＆ 0和delta o-18，类似于5.3％）和同化的旧地壳（各种低ehf和delta o-18＆ 5.3％）。在矿化的Pataz Batholith中的Au终极来源被氧化（FO（2）在FMQ缓冲液中;基于锆痕量化学）和碱，含碱，富含HFSE，最有可能由甲状腺露面代表。相对减少（Delta FMQ＆LT; 0）但未形成的突出施加，A（2）型套件涉及减少外壳的同化。相关，减少，岩浆 - 水热流体渗透到携带肛门浴池套件，并有效地动员和运输并浓缩Au。在蒙大利亚岛地区，岩石被氧化（Delta FMQ＆ 0），并且占主导地位的地幔得出，而无需重大融合地壳材料。来自Cu-in-in-in-in-in-in-in-in-18的样品表示Delta O-18＆的额外贡献。 5.3％的来源，可能融化的层 - 2 Gabbro。此外，升高的全岩LA / Yb和Sr / Y比率与次区域中的次要衍生材料较小，这可能具有增强的Cu禀赋。源于较小的A（2）型套件控制Cu的氧化液，源于较小的A（2）型套件控制Cu的浓度，而Au表现在很大程度上。一般而言，假设大陆弧中的源混合是对比Cu和Au禀赋的一阶控制，并且顺序入侵过程促进了晚尾 - 水热动员和特定金属组装的浓度。

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