Abstract

Geological observations and U–Pb dating of zircons from intrusions of the Yana–Kolyma gold province constrain the age of orogenic gold deposits to the time interval between 150 ± 3Ma and 108 ± 1 Ma. The Natalka deposit is the largest key deposit in the gold province. We determined the age of mineralization as the Valanzhinian (136 ± 1 to 132 ± 2 Ma) by ⁴⁰Ar/³⁹Ar dating of muscovite and by Re–Os dating of arsenopyrite and native gold. There are no known manifestations of magmatism of this age in the province, therefore, we conclude that the formation of gold–quartz mineralization is very likely related to metamorphism and metasomatism triggered by regional-scale shear deformations.

中文翻译：

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纳塔卡造山金矿床年龄（U-Pb、40Ar/39Ar、Re-Os约束）

摘要

地质观测和亚纳-科雷马金矿省侵入体锆石 U-Pb 定年将造山金矿床的年龄限制在 150 ± 3 Ma 和 108 ± 1 Ma 之间。纳塔卡矿床是黄金省最大的关键矿床。^{我们通过白云母的40} Ar/ ³⁹ Ar 测年以及毒砂和天然金的 Re-Os 测年将矿化年龄确定为瓦兰芝阶（136 ± 1 至 132 ± 2 Ma） 。该省尚无已知的该时代岩浆作用表现，因此，我们推断金石英矿化的形成很可能与区域尺度剪切变形引发的变质作用和交代作用有关。