Abstract

The Late Jurassic orogenic volcanogenic–plutonogenic Darasun gold deposit (the Eastern Transbaikalian segment of the Mongolia-Okhotsk Foldbelt) includes post-gold antimony mineralization. Aggregates of rice-like quartz, minerals of the jordanite–geocronite–schulzite series, sphalerite, galena, arsenopyrite, tennantite–tetrahedrite, calcite, and Mn–Mg siderite are its earlier formations; the later ones include rice-like quartz, low-iron sphalerite, Pb–Sb sulphosalts, antimonite, and berthierite. The Darasun trend of the sequence of Pb–Sb sulphosalts from bulangerite to fülöppite is typical of post-magmatic hydrothermal gold deposits and differs from that of telethermal ones. There are two fülöppite types in Darasun ores: fülöppite enriched in arsenic (up to 7.5 wt %), which is probably the product of replacement of geocronite and fahlerz mineral series, and arsenic-free fülöppite associated with antimonite and calcite. The composition of arsenic-bearing fülöppite is Pb_2.90Ag_0.06Cu_0.05)_3.01(Sb_7.05As_0.91Bi_0.04)_8.00S_14.99 and the composition of arsenic-free fülöppite is (Pb_2.83Cu_0.18)_3.01Sb_7.98S_15.01, which are close to stoichiometric. The Darasun fülöppite is characterized by a positive correlation between As, Bi, and Ag; arsenic-free fuloppite is enriched in copper.

中文翻译：

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Darasun火山成岩成矿金矿床中的FülöppitePb 3 Sb 8 S 15（东贝贝卡利亚）

摘要

侏罗纪晚期火山岩-成岩成因的达拉孙金矿床（蒙古-鄂霍次克褶皱带的东跨拜卡凯尔岩段）包括金后锑矿化。大米状石英的聚集体，闪长石，方铅矿，方铅矿，毒砂，闪锌矿-四面体，方解石和Mn-Mg菱铁矿的矿物包括闪长石，方铅矿，方铅矿，方解石和Mn-Mg菱铁矿。后者包括稻米状石英，低铁闪锌矿，Pb-Sb硫盐，锑矿和绿铁矿。铅锌锑矿盐从方钠石到富勒普岩的Darasun趋势是岩浆后热液金矿床的典型特征，与远热矿床的趋势不同。Darasun矿石中有两种硅藻土类型：富砷的硅藻土（含量高达7.5 wt％），这可能是取代大柱石和fahlerz矿物系列以及不含锑和方解石的无砷富勒石的产物。含砷的氟磷灰石的成分是Pb_2.90 Ag _0.06 Cu _0.05）_3.01（Sb _7.05 As _0.91 Bi _0.04）_8.00 S _14.99且无砷富勒贝石的组成为（Pb _2.83 Cu _0.18）_3.01 Sb _7.98 S _15.01，接近化学计量比。Darasun硅铁矿的特征在于As，Bi和Ag之间呈正相关；无砷富铝铁矿富含铜。