Orogenic Gold Deposits of Northern Transbaikalia, Russia: Geology, Age, Sources, and Genesis

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geochemistry International Pub Date : 2024-10-22 DOI:10.1134/S0016702924700484
A. V. Chugaev
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引用次数: 0

Abstract

The paper presents newly obtained and summarizes preexisting data of long-term geochronological and isotope studies of orogenic mesothermal gold deposits in the world’s largest Lena metallogenic province and reviews interpretations of their genesis. Geochronologic data indicate that the gold mineralization was formed during three ore-forming Paleozoic events. The early Late Ordovician–Early Silurian (450–430 Ma) event produced the abundant veinlet—disseminated gold–sulfide mineralization in Neoproterozoic carbonaceous terrigenous–carbonate rocks of the Baikal–Patom foldbelt (BPB). The mineralization was formed simultaneously with regional metamorphic processes. The rejuvenation of hydrothermal activity in the BPB resulted in gold-bearing quartz veins, which was produced in the Middle Carboniferous (340–330 Ma) in relation to postcollisional granitoid magmatism. The latest ore-forming event occurred in the Early Permian (290–280 Ma) and affected exclusively in Precambrian structures of the Baikal-Muya foldbelt (BMB). It was synchronous with the development of intraplate alkaline and subalkaline magmatism in the region. Newly obtained and preexisting isotopic-geochemical (87Sr/86Sr, 143Nd/144Nd, Pb–Pb, and δ34S) data indicate that the mesothermal ore-forming systems of northern Transbaikalia were heterogeneous in their isotopic characteristics, which distinguishes them from the ore–magmatic (intrusion-related type) systems. Comparison of the Sr, Nd, and Pb isotopic composition of the ores and rocks, including magmatic rocks coeval with the gold mineralization, indicates that the Precambrian continental crust was the dominant source of mineral-forming components for the hydrothermal systems of the gold deposits. The contribution of the magmatic source to the genesis of the orogenic gold mineralization was limited and is identifiable only for the Early Permian ore-forming systems of the BMB, for which the input of metals from alkaline mafic melts was suggested.

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俄罗斯外贝加尔北部的造山运动金矿床:地质、年龄、来源和成因
本文介绍了新近获得并总结了对世界上最大的勒拿河成矿带中热成岩金矿床的长期地质年代和同位素研究数据,并回顾了对其成因的解释。地质年代数据表明,金矿化是在古生代三次成矿事件中形成的。晚奥陶世早期-早志留纪(450-430Ma)事件在贝加尔湖-帕托姆褶皱带(BPB)的新元古代碳质陆相碳酸盐岩中形成了丰富的细脉浸染型硫化金矿化。矿化是与区域变质过程同时形成的。中石炭世时期(340-330Ma),贝加尔-帕托姆褶皱带的热液活动重新活跃起来,形成了含金石英脉,这与碰撞后花岗岩岩浆活动有关。最近的成矿事件发生在早二叠世(290-280Ma),只影响到贝加尔-穆亚褶皱带(BMB)的前寒武纪构造。它与该地区板内碱性和亚碱性岩浆活动的发展同步。新获得的和已有的同位素地球化学(87Sr/86Sr、143Nd/144Nd、Pb-Pb 和 δ34S)数据表明,外贝加尔地区北部的中温成矿系统在同位素特征上是异质的,这使它们有别于矿浆型(与侵入有关的类型)系统。对矿石和岩石(包括与金矿化共生的岩浆岩)的钍、钕和铅同位素组成进行比较后发现,前寒武纪大陆地壳是金矿床热液系统成矿成分的主要来源。岩浆源对成因金矿化的贡献是有限的,只有BMB的早二叠纪成矿系统的岩浆源是可以确定的,这表明金属是从碱性岩浆熔体中输入的。
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来源期刊
Geochemistry International
Geochemistry International 地学-地球化学与地球物理
CiteScore
1.60
自引率
12.50%
发文量
89
审稿时长
1 months
期刊介绍: Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
期刊最新文献
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