Gold Mineralzation from Calcite-Dolomite Carbonatite of the Guli Massif (Maimecha-Kotui Province, Polar Siberia): First Results

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-09-16 DOI:10.1134/s1028334x24603079

K. N. Malitch, G. V. Lipenkov, D. A. Ozornin, M. V. Naumov, I. Yu. Badanina, V. A. Bulatov, A. A. Voitin

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Abstract

Complex gold-iridium-osmium placer deposits associated with the Guli massif of ultramafic, alkaline rocks and carbonatites are located within the Maimecha-Kotui province in the northern part of the Siberian Platform. Unlike natural Os-Ir alloys, which are genetically related to ultramafic rocks, the bedrock source of gold remains controversial. We report, for the first time, morphological and compositional features of gold mineralization from calcite-dolomite carbonatite of the Guli massif. Gold minerals are represented by natural Au-Ag alloys containing gold (69.64–88.57 wt %) and silver (11.73–30.83 wt %) with low concentrations of copper (up to 0.18 wt %), which predominate over minerals of the system Au–Cu–Ag (e.g., natural alloys Au_0.74Cu_0.14Ag_0.12 and Ag_0.51Au_0.47Cu_0.02, tetra-auricupride (AuCu) and auricupride (Cu₃Au)). Gold minerals are characterized by an early pentlandite-troilite-chalcopyrite association that form polyphase euhedral inclusions. Later galena (PbS) occurring in the form of subhedral monophase inclusions is replaced by cerussite (PbCO₃). The revealed similarity of gold minerals and mineral assemblages in gold from calcite-dolomite carbonatite with those of gold minerals from placer deposits of the Guli massif indicates that derivatives of ijolite-carbonatite magmatism played a significant role in gold ore formation.

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古力丘（极地西伯利亚梅查-科推省）方解石-白云石碳酸盐岩中的金成矿作用：初步结果

摘要与由超基性岩、碱性岩和碳酸盐岩组成的古里地块有关的复杂金-铱-锇块状矿床位于西伯利亚地台北部的麦伊梅查-科图伊省。与与超基性岩有遗传关系的天然Os-Ir合金不同，金的基岩来源仍然存在争议。我们首次报告了古里地块方解石-白云石碳酸盐岩中金矿化的形态和成分特征。金矿物以天然金银合金为代表，其中含有金（69.64-88.57 重量%）和银（11.73-30.83 重量%）以及低浓度的铜（最高达 0.18 重量%），主要是金-铜-银系统的矿物（例如：天然合金 Au0.Cg、Au0.Cg、Au0.Cg、Au0.Cg、Au0.Cg、Au0.Cg、Au0.Cg）、天然合金 Au0.74Cu0.14Ag0.12 和 Ag0.51Au0.47Cu0.02、四金酸锂（AuCu）和金酸锂（Cu3Au））。金矿物的特征是形成多相八面体包裹体的早期辉铜矿-黄铜矿联合体。之后，方铅矿（PbS）以亚长岩单相包裹体的形式出现，并被黄铜矿（PbCO3）所取代。所揭示的方解石-白云石碳酸盐岩中的金矿物和矿物组合与古里地块块状矿床中的金矿物相似，这表明黝帘石-碳酸盐岩岩浆作用的衍生物在金矿形成过程中发挥了重要作用。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.