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Ruby Mineralization in Murzinka–Adui Metamorphic Complex, Central Urals
Geology of Ore Deposits ( IF 0.7 ) Pub Date : 2020-09-22 , DOI: 10.1134/s1075701520040042
A. Yu. Kisin , V. V. Murzin , A. V. Tomilina , V. N. Smirnov , M. E. Pritchin

Abstract

The Lipovka and Alabashka ruby occurrences in the Central Urals hosted in marble of the Murzinka–Adui Anticlinorium are considered. The field works were carried out; the chemical compositions of rocks and minerals and oxygen isotopic composition of corundum and silicates were determined; and micas were dated by the K–Ar method. These occurrences are similar in geological environment and mineral assemblages to the ruby occurrences in the South Urals and deposits in Southeast Asia. At the Alabashka occurrence, ruby was also found from brecciated mineralized granite and amphibolite. The mineralized breccia and ruby-bearing marble are enriched in K- and Cr-bearing minerals. Ruby characterized by a narrow range of the oxygen isotopic composition (δ18О = 14.2–17.8‰) corresponding to that of metamorphic and metasomatic corundum. The hydrogen isotopic composition of fuchsite ranges from –78.5 to –89.6‰, while the δD value calculated for fluid equilibrated with fuchsite varies from –48.8 to –79.7‰ that is consistent with the high-temperature equilibrium with magmatic rocks. Aluminum and Cr were mobile elements and could be inflowed by fluids during ruby formation. Corundum mineralization at both occurrenceswas dated at 280–260 Ma, which is consistent with the beginning of post-collisional relaxation. The Murzinka–Adui Anticlinorium is the most prospective area in the Urals for the high-quality ruby deposits.



中文翻译:

乌拉尔中部Murzinka–Adui变质复合体中的红宝石矿化

摘要

考虑在Murzinka-Adui Anticlinorium大理石中托管的乌拉尔中部的Lipovka和Alabashka红宝石。进行了现场工作;测定了岩石和矿物的化学组成以及刚玉和硅酸盐的氧同位素组成;云母和云母通过K–Ar方法确定了日期。这些事件的地质环境和矿物组合与南乌拉尔和东南亚矿床的红宝石事件相似。在阿拉巴卡(Alabashka)事件中,还从角砾化的矿化花岗岩和角闪石中发现了红宝石。矿化的角砾岩和红宝石大理石富含钾和铬矿物。红宝石,其特征在于窄范围的氧同位素组成(δ 18О= 14.2–17.8‰),对应于变质和变质刚玉。富铁矿的氢同位素组成范围为–78.5至–89.6‰,而用富铁矿平衡的流体计算出的δD值介于–48.8至–79.7‰之间,这与岩浆岩的高温平衡相一致。铝和铬是可移动元素,在红宝石形成过程中可能会被流体流入。两次出现的刚玉矿化时间都在280-260 Ma,这与碰撞后松弛的开始是一致的。Murzinka-Adui Anticlinorium是乌拉尔地区最有可能开采高质量红宝石矿床的地区。

更新日期:2020-09-23
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