Abstract

The article is devoted to the results of mineralogical and geochemical studies of argillizites at Compleksnoe Au–Ag ore occurrence, localized on the southern flank of the Kajenmyvaam volcanic uplift in the inner zone of the Late Cretaceous marginal–continental Okhotsk-Chukchi volcanic belt (OChVB). At the ore occurrence, a series of isometric (oval) in plan view argillizite “hats” with diameters of 200 to 900 m are described. They are composed of red and light gray clay formations and accompanied by complex (Au–Ag–Mo–Cu–Pb–Zn–Bi–Sn) anomalies. In the recent relief, argillizite “hats” are characterized by gently sloping domes and crown subvolcanic bodies of granitoids and explosive breccias. A series of argillizite “hats” is surrounded by elongated lenticular bodies of secondary quartzites, which form the outer boundary of a large annular volcanostructure. The argillizites are composed of the following minerals: illite-smectite (mixed-layered formation), kaolinite, muscovite, jarosite, quartz, and rutile. The average content of Au and Ag in bulk samples are 0.06 and 0.075 g/t, respectively. Au is found in invisible form. According to the geological and geochemical data, argillizite “hats” record a near-surface (up to 300 m), slightly eroded, level of a large porphyry-epithermal mineral-forming system.

中文翻译：

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Kayenmyvaam火山隆升（楚科奇中部）发生的Kompleksnoe矿石中的钠辉石“帽”

摘要

本文专门研究Compleksnoe Au-Ag矿床中的辉绿岩的矿物学和地球化学研究结果，其位于白垩纪晚期边缘-鄂霍次克-楚科奇火山带（OChVBB）内部区域的Kajenmyvaam火山隆升的南翼。 ）。在成矿时，描述了一系列等直径（椭圆形）的直径为200至900 m的斜方晶石“帽”。它们由红色和浅灰色的粘土组成，并伴有复杂的（Au-Ag-Mo-Cu-Pb-Zn-Bi-Sn）异常。在最近的救济中，凹凸棒石“帽子”的特征是缓缓倾斜的圆顶和花岗岩体和易爆角砾岩的冠下火山体。一系列的辉石“帽子”被次生石英岩的细长的柱状体包围，形成一个大型环形火山结构的外边界。闪锌矿由以下矿物组成：伊利石-蒙脱石（混合层状地层），高岭石，白云母，黄钾铁矾，石英和金红石。散装样品中金和银的平均含量分别为0.06和0.075 g / t。金以不可见的形式存在。根据地质和地球化学数据，凹凸棒石“帽子”记录了一个大型的斑岩-表热矿物形成系统的近地表（最大300 m），略有侵蚀的水平。