Abstract

Isotope study of ore-bearing rocks at Fe–Mn rift deposits of the Atasu and Zhezdy (Dzhezdy) ore districts in Central Kazakhstan has been carried out for the first time. The Atasu felsic effusive rocks (Ushkatyn-1 deposit), synchronous to ore genesis, were formed at the boundary between the Frasnian and Famennian (373 ± 4 Ma). The Zhezdy ore-bearing gravelites began to accumulate not earlier than the end of the Early Devonian (after 400 Ma), but before the felsic volcanism impulse at the turn of 370 Ma. The data obtained can be indicative of asynchronous Fe–Mn deposition in the Zhezdy and Atasu ore districts.

中文翻译：

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哈萨克斯坦中部泥盆纪铁锰矿床的含矿岩石年龄

摘要

哈萨克斯坦中部Atasu和Zhezdy（Dzhezdy）矿区的Fe-Mn裂谷矿床中的含矿岩石的同位素研究已经首次进行。与矿石成因同步的阿塔苏长岩喷出岩（Ushkatyn-1矿床）形成于弗拉斯尼人和法门尼人（373±4 Ma）之间的边界。Zhezdy含矿石的砾岩开始堆积的时间不早于泥盆纪早期（400 Ma之后），而是在370 Ma的轮状火山冲动之前。获得的数据可以指示Zhezdy和Atasu矿区中非同步的Fe-Mn沉积。