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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and ~(40)Ar/~(39)Ar Geochronological Evidence
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Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and ~(40)Ar/~(39)Ar Geochronological Evidence

机译：卡尔古利金矿场中三种金矿化样式的广泛同步性：SHRIMP，U-Pb和〜（40）Ar /〜（39）Ar地质年代学证据

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There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons and hydrothermal monazite and xenotime, as well as ~(40)Ar/~(39)Ar analysis of metasomatic fuchsite and white mica, are used to date pre- to synore dikes, alteration, and orebod-ies in order to resolve this issue. The majority of gold mineralization at Kalgoorlie, including ductile-brittle Fimiston-, brittle-ductile Oroya- and brittle Mount Charlotte-style gold, are different expressions of a complex mineralizing system that was active at broadly the same time at ca. 2.64 Ga. Gold mineralization was thus de-posited in both ductile and brittle structures at approximately the same crustal level at broadly the same time, under similar P-T conditions. This giant ore system formed after ca. 2.69 Ga basic magmatism, intrusion of the Golden Mile Dolerite sill at 2680 +- 9 Ma, and intrusion of calc-alkaline feldspar-quartz porphyry dikes at 2670 +- 5 Ma. Gold mineralization was broadly coeval with lamprophyre dike intrusion at 2642 +- 6 Ma and overlapped the waning stages of hornblende- and albite-bearing porphyry dike emplacement at 2650 +- 6 Ma and regional metamorphism. Subsequent brittle deformation in the Kalgoorlie gold field was accompanied by hydrothermal activity that may have led to some late gold mineralization or remobilization in extensional quartz vein arrays in the Golden Mile between about 2.61 and 2.60 Ga. This late hydrothermal activity and associated brittle deformation marks the last event to significantly affect the rocks at Kalgoorlie and may be related to uplift and final cooling of the terrane. Despite this late event, the geometry of the Kalgoorlie gold field and its contained lode systems has remained essentially the same since the time of gold mineralization.
机译：关于卡尔古利金矿成矿事件的时间和数量一直存在争议。锆石，热液独居石和异种时间的铀-Pb测年，以及交代性烟石和白云母的〜（40）Ar /〜（39）Ar分析，可用于定古前的共鸣堤防，蚀变和兽形生物。为了解决这个问题。 Kalgoorlie的大多数金矿化，包括韧性脆性的Fimiston型，脆性韧性的Oroya型和脆性的Charlotte Charlotte型金，是复杂矿化系统的不同表现形式，该矿床在大致相同的时间处于活跃状态。 2.64 Ga。因此，在相似的P-T条件下，大致同时在大致相同的地壳水平上，在延性和脆性结构中沉积了金矿化。这种巨型矿石系统是在约20年后形成的。 2.69 Ga基本岩浆作用，在2680±9 Ma处侵入金英里白云母基岩，在2670±5 Ma处侵入钙碱性长石-石英斑岩堤防。金矿化大致与2642±6Ma的煌斑岩堤侵入相吻合，并与2650±6Ma的角闪石和钠长石斑岩脉的逐渐消亡阶段和区域变质重叠。随后在卡尔古利金矿场发生的脆性变形伴随着热液活动，这可能导致了黄金英里约2.61至2.60 Ga之间的伸展石英脉阵列中的一些晚期金矿化或迁移。这种晚期热液活动和相关的脆性变形标志着这是最后一次明显影响Kalgoorlie岩石的事件，可能与地层隆升和最终冷却有关。尽管发生了这一晚事件，但自金矿化以来，卡尔古利金矿场的几何形状及其包含的矿床系统基本上保持不变。

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