Unusual Mineralization in Basaltic Andesites of the Submarine Esmeralda Volcano (Mariana Island Arc)

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Lithology and Mineral Resources Pub Date : 2024-07-13 DOI:10.1134/S0024490224700585

V. A. Rashidov, V. V. Petrova, V. V. Ananyev, N. V. Gorkova

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Abstract

The results of studies of a basaltic andesite sample (complicated by the mineralized fracture and voids, as well as fracture and gas voids filled with secondary mineralization) dredged on the submarine Esmeralda Volcano are presented. A detailed comparative study of the mineral composition of the substance lining the fracture, the near-fracture space, and the basaltic andesite part unaffected by secondary alterations made it possible to discover the presence of a mineral assemblage, which is atypical for the unaltered volcanic rocks, in the submarine Esmeralda Volcano. In the intra-fracture space and adjacent basaltic andesite zones, wide variation ranges of the plagioclase composition are recorded; isomorphism in the Fe–Ca pyroxene series is studied; REE oxides, hydroxides, and fluorohydroxides are studied; and variability in the composition of minerals of the magnetite–hematite series is shown. Tectonic movements in the previously formed basaltic andesites likely promoted the emergence of permeable zones, through which new portions of the melt leaked. In a limited space, high fluid gas saturation, temperature, and pressure fostered the extraction of metal compounds from the melt and host rocks.

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埃斯梅拉达海底火山（马里亚纳岛弧）玄武安山岩中的异常成矿作用

摘要介绍了对埃斯梅拉尔达火山海底挖出的玄武安山岩样本（因矿化断裂和空隙以及充满二次矿化的断裂和气体空隙而变得复杂）的研究结果。通过对裂缝内层物质、近裂缝空间和未受次生蚀变影响的玄武安山岩部分的矿物成分进行详细的比较研究，发现埃斯梅拉达火山海底存在一种矿物组合，这种矿物组合在未发生蚀变的火山岩中并不常见。在断裂内空间和邻近的玄武安山岩区，记录了斜长石成分的广泛变化范围；研究了铁-钙辉石系列的同构性；研究了 REE 氧化物、氢氧化物和氟氢氧化物；并显示了磁铁矿-赤铁矿系列矿物成分的变化。之前形成的玄武安山岩的构造运动很可能促进了渗透带的出现，熔体的新部分通过这些渗透带泄漏出来。在有限的空间内，高流体气体饱和度、温度和压力促进了从熔体和主岩中提取金属化合物。

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来源期刊

Lithology and Mineral Resources 地学-地球化学与地球物理

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.