The Age of Gold Mineralization of the Elga Deposit, Mongol-Okhotsk Fold Belt: 40Ar/39Ar Geochronological Constraints

被引：0
|
作者：
Kadashnikova, A. Yu [1 ]
Sorokin, A. A. [1 ]
Ponomarchuk, A., V [2 ]
Travin, A., V [2 ]
Ponomarchuk, V. A. [2 ]
机构：
[1] Russian Acad Sci, Inst Geol & Nat Management, Far Eastern Branch, Blagoveshchensk 675000, Russia
[2] Russian Acad Sci, Inst Geol & Mineral, Siberian Branch, Novosibirsk 630090, Russia
来源：
RUSSIAN JOURNAL OF PACIFIC GEOLOGY | 2022年 / 16卷 / 02期
基金：
俄罗斯科学基金会;
关键词：
orogenic gold deposits; 40Ar; 39Ar geochronology; gold; Elga gold deposit; Mongol-Okhotsk fold belt; SELENGA-STANOVOI SUPERTERRANE; EASTERN PART; ORE METASOMATITES; ALBYN DEPOSIT; UPPER AMUR; TRANSBAIKALIA; GEOCHEMISTRY; GRANITOIDS; COMPLEX; ROCKS;
D O I：
10.1134/S1819714022020051
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
As a result 40Ar/39Ar geochronological studies, the age of gold mineralization has been determined for the Elga deposit that is located in the eastern part of the Mongol-Okhotsk fold belt. The age of ore metasomatites and ore-hosting hydrothermally altered carbonaceous sericite-feldspar-quartz schists is estimated at 139-137 Ma. The formation of ore mineralization of the Elga deposit is not likely related to magmatic processes, because the age of igneous complexes within the studied region is either younger or significantly older than the mineralization. An almost identical age of 139 Ma is identified for sericite from schists of the Talyma Formation beyond the ore zone. This indicates that the final stage of metamorphism and regional deformations, on one hand, and the formation of ore metasomatites, on the other hand, has similar age. In our opinion, the key role in mobilization and redistribution of ore matter and the formation of the Elga deposit belongs to postcollisional dislocation processes, which were accompanied by hydrothermal alteration.
引用
收藏
页码：143 / 152
页数：10
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