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首页> 外文期刊>Doklady Earth Sciences >Metasomatic Mineral Composition at the Sukhoi Log Gold Deposit: Evidence for Its Genetic Relation with Mafic-Ultramafic Magmatism
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Metasomatic Mineral Composition at the Sukhoi Log Gold Deposit: Evidence for Its Genetic Relation with Mafic-Ultramafic Magmatism

机译：苏霍伊原木金矿床的交代矿物成分：与镁铁质-超镁铁质岩浆作用成因关系的证据

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摘要

Metasomatic alterations of rocks and compositional features of newly formed minerals at the stratiform Sukhoi Log gold deposit (Patom Highland) provide new insights into conditions of the hydrothermal process, in particular, the contribution of mafic-ultramafic magmas to metasomatism and ore formation. The Sukhoi Log deposit is located in the Riphean Bodaibo Au-bearing turbidite terrane south of the passive continental margin of the North Asian Craton. The terrane incorporates gold-quartz vein and gold-sulfide-quartz vein-disseminated deposits. The deep structure of the Bodaibo Au-bearing district was scrutinized in [2]. The host turbidite sequence of the Sukhoi Log, the largest gold deposit in the district, has a thickness of 7-8 km. The sequence is underlain by the Early Riphean ophiolite complex (about 10 km thick), which consists of predominant metabasalts and metaterrigenous rocks with horizons of ferruginous quartzites intruded by ultramafic bodies. The ultramafic bodies are recorded by local positive gravity anomalies. Granite massifs younger than the host turbidites occur both at the present-day erosion level and at depth. The Sukhoi Log gold deposit is believed to be correlated with the deep-seated Ugakhan granite pluton reflected by the Ugakhan Δg minimum. The estimated depths of the roof and bottom of the pluton are 3.2 and 8-8.5 km, respectively. The deposit is shifted to the margin of pluton projection on the surface. In the Vendian-Cambrian, epicratonic sequences were subjected to fold-nappe and shear deformations and regional metamorphism.
机译：层状苏霍伊原木金矿床（帕托姆高地）的岩石交代变化和新形成的矿物的成分特征为热液过程的条件提供了新的见解，特别是铁镁质-超镁铁质岩浆对交代作用和矿石形成的贡献。苏霍伊原木矿床位于北亚克拉通被动大陆边缘以南的里菲安·博戴博含金混浊地层中。地层包含金石英脉和硫化金石英脉弥散的沉积物。在[2]中对Bodaibo含金地区的深层结构进行了详细审查。该地区最大的金矿床Sukhoi测井的主体浊积岩层厚7-8公里。该序列位于早期的里菲安蛇绿岩复合体（约10 km厚）之下，该复合体由主要的玄武岩和变质岩组成，层状的铁质石英岩被超镁铁质岩体侵入。超镁铁质岩体是由局部正重力异常记录的。比主体浊质还年轻的花岗岩地块发生在当今的侵蚀水平和深度。据信，苏霍伊原木金矿床与UgakhanΔg最小值所反映的深层Ugakhan花岗岩岩体相关。岩体顶部和底部的估计深度分别为3.2 km和8-8.5 km。沉积物移动到表面上的子体投影边缘。在Vendian-Cambrian中，上覆层序列经历了折叠推覆和剪切变形以及区域变质作用。

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