Abstract

The first data of U–Pb isotopic study (LA–ICP–MS method) of zircon from tonalite–granodiorite forming a dominant part of the “trondhjemite” intrusive massif at the giant Tyrnyauz W–Mo deposit (North Caucasus) is presented. The concordant zircon isotopic U–Pb age obtained (302 ± 4 Ma) indicates a Late Paleozoic (Late Carboniferous–Early Permian) age of crystallization of these rocks. This is consistent with the Late Paleozoic epoch of W-bearing magmatism and related W mineralization in the North Caucasus (Peredovoi Ridge) and allows the possibility of the Late Paleozoic age of the large bodies of altered skarn with W mineralization at the Tyrnyauz deposit.

中文翻译：

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Tyrnyauz W-Mo矿床“ Trondhjemite”地块侵入岩的晚古生代时代（俄罗斯北高加索）：锆石U-Pb同位素定年的初步结果（LA-ICP-MS方法）

摘要

本文介绍了在巨大的Tyrnyauz W-Mo矿床（北高加索地区）中，从方钠石-闪长闪长岩形成锆石的U-Pb同位素研究（LA-ICP-MS方法）的第一批数据，该锆石形成了“硬锂铁矿”侵入性地块的主要部分。获得的一致锆石同位素U–Pb年龄（302±4 Ma）表明这些岩石的晚期古生代（石炭纪－早二叠世晚期）结晶。这与北高加索地区（Peredovoi Ridge）含钨岩浆作用的晚古生代时代和相关的钨矿化相吻合，并允许Tyrnyauz矿床的矽卡岩成矿后的大型矽卡岩晚期古生代时代的可能性。