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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >Evolution of the Giant Marcona-Mina Justa Iron Oxide-Copper-Gold District, South-Central Peru
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Evolution of the Giant Marcona-Mina Justa Iron Oxide-Copper-Gold District, South-Central Peru

机译：秘鲁中南部巨型Marcona-Mina Justa氧化铁-铜-金区的演变

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摘要

The Mesozoic iron oxide-copper-gold (IOCG) subprovince of littoral south-central Peru, centered at latitude 15°11' S, longitude 75°6' W, incorporates Marcona, the preeminent central Andean iron oxide deposit (1.9 Gt @ 55.4% Fe), and Mina Justa, one of the few major Andean IOCG deposits with economic copper grades (346.6 Mt @ 0.71% Cu). The emplacement of magnetite orebodies with uneconomic Cu grades (avg 0.12%) at Marcona was controlled by northeast-striking faults transecting an active andesitic-dacitic, shallow-marine Middle Jurassic (Aalenian to Oxfordian) arc. In contrast, hypogene Cu sulfide (approx 15 g/t Ag, 0.12 g/t Au) miner-alization at Mina Justa was emplaced along reactivated listric-normal detachment faults during the mid-Creta-ceous inversion of the contiguous, plate boundary-parallel, Aptian to Albian Cafiete basin, accompanied by the earliest, largely granodioritic-dioritic;, stocks of the Coastal batholith. Alteration and mineralization assem-blages, supported by ~(40)Ar/~(39)Ar geochronology of biotite, phlogopite, actinolite, cummingtonite, and K-feldspars, reveal a history of magmatic and hydrothermal processes extending episodically for at least 80 m.y., from ca. 177 to 95 Ma, wherein metal-rich mineralization events were preceded and separated by episodes of barren alteration.
机译：秘鲁中南部沿海地区的中生代氧化铁-铜-金（IOCG）子省，以北纬15°11'，经度75°6'W为中心，结合了著名的安第斯中部氧化铁矿床Marcona（1.9 Gt @ 55.4）铁）和Mina Justa（安第斯IOCG少数几个主要的经济铜品位之一）（铜含量为346.6 Mt，铜含量为0.71％）。马可纳铜矿品位不经济的铜（平均0.12％）的位置是由东北冲断层横断的，该断层横穿了活跃的安山—胶水，浅海中侏罗世（阿利尼亚至牛津）弧。相比之下，在连续的板块边界-Creta-ceous反转的中斜正断层断层中，沿Mina Justa矿化了次生铜硫化物（约15 g / t Ag，0.12 g / t Au）矿化。平行的，从阿普提安到阿尔比亚卡菲特盆地，伴随着最早的，主要是粒二叠纪-二叠纪;沿海岩床的存量。黑云母，金云母，阳起石，康明石和钾长石的〜（40）Ar /〜（39）Ar地质年代学支持的蚀变和矿化组合-揭示了至少80 mys的岩浆和热液过程的历史，来自ca。 177至95 Ma，其中富金属矿化事件先于贫瘠蚀变事件发生并被其分开。

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