To model the formation of orogenic gold deposits, in a global perspective, it is important to understand the ore-forming conditions not only for deposits hosted in greenschist facies rocks but also in amphibolite facies. The Paleoproterozoic Fäboliden deposit in northern Sweden belongs to the globally rare hypozonal group of orogenic gold deposits and, as such, constitutes a key addition to the understanding of amphibolite facies orogenic gold deposits. The Fäboliden deposit is characterized by auriferous arsenopyrite-rich quartz veins, hosted by amphibolite facies supracrustal rocks and controlled by a roughly N-striking shear zone. Gold is closely associated with arsenopyrite-löllingite and stibnite, and commonly found in fractures and as inclusions in the arsenopyrite-löllingite grains. The timing of mineralization is estimated from geothermometric data and field relations at c. 1.8 Ga. In order to constrain the origin of gold-bearing fluids in the Fäboliden deposit, oxygen, hydrogen, and sulfur isotope studies were undertaken. δ 18 O from quartz in veins shows a narrow range of + 10.6 to + 13.1‰. δD from biotite ranges between − 120 and − 67‰, with most data between − 95 and − 67‰. δ 34 S in arsenopyrite and pyrrhotite ranges from − 0.9 and + 3.6‰ and from − 1.5 and + 1.9‰, respectively. These stable isotope data, interpreted in the context of the regional and local geology and the estimated timing of mineralization, suggest that the sulfur- and gold-bearing fluid was generated from deep-crustal sedimentary rocks during decompressional uplift, late in the orogenic evolution of the area. At the site of gold ore formation, an 18 O-enriched magmatic fluid possibly interacted with the auriferous fluid, causing precipitation of Au and the formation of the Fäboliden hypozonal orogenic gold deposit.

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瑞典 Fäboliden 地下造山带金矿床的流体和金属来源

为了模拟造山金矿床的形成，从全球角度来看，不仅要了解绿片岩相岩石中的矿床而且还包括角闪岩相的矿床的成矿条件，这一点很重要。位于瑞典北部的古元古代 Fäboliden 矿床属于全球罕见的造山型金矿床次带组，因此，是了解角闪岩相造山金矿床的重要补充。Fäboliden 矿床的特征是富含含金砷黄铁矿的石英脉，由角闪岩相上地壳岩石托管，并受大致 N 走向的剪切带控制。金与毒砂-菱锌矿和辉锑矿密切相关，通常存在于裂缝中，并作为毒砂-菱镁矿颗粒中的夹杂物。矿化时间是根据 c 处的地热数据和现场关系估计的。1.8 Ga。为了限制 Fäboliden 矿床中含金流体的来源，进行了氧、氢和硫同位素研究。来自脉中石英的 δ 18 O 显示出 + 10.6 至 + 13.1‰ 的狭窄范围。黑云母的 δD 范围在 - 120 和 - 67‰之间，大多数数据在 - 95 和 - 67‰之间。毒砂和磁黄铁矿中的 δ 34 S 范围分别为 - 0.9 和 + 3.6‰以及 - 1.5 和 + 1.9‰。这些稳定同位素数据在区域和地方地质背景以及矿化估计时间的背景下进行解释，表明含硫和含金流体是在减压隆升期间从深层地壳沉积岩中产生的，在造山带的造山演化后期。该地区。在金矿形成现场，