Abstract

A study of the composition of fluid inclusions in ore minerals of the Davenda Mo–porphyry deposit and the Aleksandrovskoe sulfide–quartz–gold ore deposit, as well as of fluid inclusions in minerals of igneous rocks, showed that ore-forming fluids inherit the salt and gas composition of magmatic fluids generated during crystallization of ore-bearing rocks of the Amudzhikan–Sretensky Igneous Complex, which formed simultaneously with the Au and Mo mineralization. The gold-bearing sulfide–quartz veins of the Aleksandrovskoe deposit formed with the participation of two types of hydrothermal fluids, differing in the composition of salts and the gas phase: homogeneous Ca–Na chloride fluids with CO₂ and heterophasic Na–K–Fe-chloride fluids, which indicates two sources of ore-forming fluids during the formation of Au-mineralization. Na–K–Fe-chloride fluids in terms of salt and gas composition were similar to the ore-forming fluids of the Mo-mineralization of the Davenda deposit. Ore-forming Ca–Na-chloride with CO₂ The fluids of the Aleksandrovskoe field are comparable in salt and gas composition with the magmatogenic fluids of quartz diorite porphyries and diorite porphyrites. Ore forming Na–K–Fe carbonate-chloride fluids of the Davenda and Aleksandrovskoe deposits show great similarity in composition to magmatic fluids of granite porphyry and emphasize the genetic identity of Mo mineralization in both deposits. The data obtained confirm the widespread opinion that a genetic relationship exists between gold mineralization and dikes of intermediate and mafic composition, and molybdenum–porphyry mineralization with granite–porphyry of the Amudzhikan–Sretensky Igneous Complex. The real agents of this genetic link are metalliferous magmatogenic fluids, the salt and gas composition of which inherit ore-forming fluids. The formation depth of productive ore mineral assemblages in veins of the Aleksandrovskoe and Davenda deposits is estimated at 7.9–7 and 8–6.3 km, respectively, which is not typical of porphyry deposits, the formation of which is characterized by shallower depths.

中文翻译：

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Aleksandrovskoe和Davenda矿床的成矿流体（东拜拜卡利亚）

摘要

对Davenda钼斑岩矿床和Aleksandrovskoe硫化物-石英-金矿石矿床中的流体包裹体组成以及火成岩矿物中的流体包裹体的研究表明，成矿流体继承了盐分和Auudzhikan-Sretensky火成岩含矿岩石结晶过程中产生的岩浆流体的气体和气体成分，这与Au和Mo矿化同时形成。Aleksandrovskoe矿床的含金硫化物-石英矿脉是由两种类型的热液流体参与形成的，其盐分和气相的组成有所不同：均相的Ca-Na氯化物流体，CO ₂和多相Na–K–Fe氯化物流体，这表明金矿化过程中成矿流体的两个来源。就盐和气体组成而言，Na–K–Fe氯化物流体类似于达文达矿床钼矿化的成矿流体。与CO ₂成矿的氯化钠Aleksandrovskoe油田的流体在盐和气体成分方面可与石英闪长斑岩和闪长斑岩的成岩流体相媲美。Davenda和Aleksandrovskoe矿床的成矿Na–K–Fe碳酸盐-氯化物流体与花岗岩斑岩的岩浆流体在组成上有很大的相似性，并强调了这两个矿床中Mo矿化的遗传特征。所获得的数据证实了普遍的观点，即金矿化与中，镁铁矿成分的堤防之间存在遗传关系，而阿穆德坎坎-斯列滕斯基火成岩复合体的钼斑岩矿化与花岗岩-斑岩斑岩之间存在遗传关系。这种遗传联系的真正推动力是成矿成岩流体，其盐和气体成分继承了成矿流体。