西伯利亚圈闭中的天然铁

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-06-15 DOI:10.1134/S0869591123020054
M. D. Tomshin, A. G. Kopylova, A. E. Vasilyeva
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引用次数: 1

摘要

对具有大规模天然铁赋存的圈闭侵入体的研究,使我们能够确定其组成和成因的一般特征。侵入体分异弱,构造相似,矿物学、石油化学和地球化学组成相似。在所有被研究的岩体中发现了两种形成岩石的矿物组合:早期深埋(前腔)和腔内。原生铁形成球状偏析,其次为纯白铁矿、三黄铁矿和磁铁矿。金属铁可以积累Ni、Co、Au和PGE。它们在金属中的含量比宿主硅酸盐岩石增加数百甚至数千倍。天然铁的形成是基于岩浆与流体还原性组分(主要是甲烷-氢成分)的流体-岩浆相互作用。结果,最初均匀的玄武岩液体分散成硅酸盐和金属成分。在运输过程中,分散较细的铁相形成液滴-液分离,表面形成单分子气体层,阻止了金属液滴的扩大。在浅成岩浆室,岩浆,包括金属球粒,被脱气,液滴合并形成原生铁的球状分离。
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Native Iron in Siberian Traps

The study of trap intrusions with a large-scale occurrence of native iron allowed us to identify general features in their composition and origin. Intrusive bodies are weakly differentiated and have similar structure and mineralogical, petrochemical and geochemical composition. Two associations of rock-forming minerals were found in all studied bodies: early deep-seated (pre-chamber) and intra-chamber. Native iron forms nodular segregations, with a subordinate amount of cohenite, troilite and magnetite–wüstite. Metallic iron can accumulate Ni, Co, Au, and PGE. Their content in metal increases by hundreds or even thousands of times compared to host silicate rock. The formation of native iron is based on the fluid-magmatic interaction between magma and reducing components of the fluid, mainly of methane–hydrogen composition. As a result, an initially homogeneous basalt liquid is dispersed into silicate and metallic components. In the course of transportation, finely dispersed iron phases form droplet-liquid segregations with a monomolecular gas layer on their surface, thus preventing enlargement of metallic droplets. In the hypabyssal chamber, magma, including metallic spherules, is degassed, and droplets are merged to form nodular segregations of native iron.

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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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