Sulfide Mineralization in Pyrometamorphosed Upper Crustal Xenoliths, Bezymianny Volcano, Kamchatka

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-06-28 DOI:10.1134/S0869591123030049
V. O. Davydova, V. D. Shcherbakov, N. A. Nekrylov, P. Yu. Plechov, V. O. Yapaskurt
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Abstract

Bezymianny volcano eruptions transport numerous xenoliths to the surface. Crustal xenoliths contain unique information about the crust structure and composition of crustal rocks located around the active magmatic system. We describe the chemical and mineral composition of upper crustal xenoliths that pyrometamorphosed (recrystallized and partially melted) in the Bezymianny shallow chamber. We reconstructed protoliths and hydrothermal processes for several rocks, which were previously altered, based on pre-pyrometamorhic relics (primary igneous associations in some xenoliths and rare hydrothermal relics). Moderate-K andesites, basaltic andesites, and basalts of Kamen and Bezymianny volcanoes dominate among the xenoliths. During pyrometamorphism, a microgranoblastic assemblage composed of homogenous pyroxenes, plagioclase, Fe-Ti oxides, and interstitial glass is formed in these xenoliths. Less common xenoliths are presented by high-K basaltic trachyandesite (plateau basalt from the basement of the Klyuchevskaya group of volcanoes). Quartz–carbonate–sulfide mineralization is present in some of them, which formed prior to xenolith entrapment and pyrometamorphism. When xenoliths were entrapped by magma, recrystallization of hydrothermally altered rock produced Fe-wollastonite–hedenbergite association (in some cases with garnet), untypical for Bezymianny. Some of these xenoliths have extremely high copper content (up to 1500 ppm).

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堪察加Bezymianny火山上地壳热变质捕虏体中的硫化物成矿作用
贝兹米亚尼火山喷发将大量捕虏体带到地表。地壳捕虏体包含有关地壳结构和地壳岩石组成的独特信息,这些地壳岩石位于活动岩浆系统周围。我们描述了在贝兹曼尼浅室中热变质(再结晶和部分熔化)的上地壳捕虏体的化学和矿物组成。基于前热变质遗迹(部分捕虏体中的原生火成岩组合和罕见的热液遗迹),我们重建了一些先前蚀变的岩石的原岩和热液过程。中钾安山岩、玄武岩安山岩以及卡门火山和贝兹曼尼火山的玄武岩在捕虏体中占主导地位。在热变质过程中,这些捕虏体中形成了由均质辉石、斜长石、铁钛氧化物和间隙玻璃组成的微粒母岩组合。不太常见的包体是高钾玄武质粗面山岩(来自克柳切夫斯卡亚火山群基底的高原玄武岩)。石英-碳酸盐-硫化物成矿作用早于捕虏体包裹和热变质作用。当捕虏体被岩浆包裹时,热液蚀变岩石的再结晶产生了铁硅灰石-镁钙石组合(在某些情况下与石榴石结合),这在贝兹曼尼是不典型的。其中一些捕虏体含有极高的铜含量(高达1500ppm)。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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