大理石mÉlange:成分变化和形成机制

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2021-12-14 DOI:10.5800/gt-2021-12-4-0556

E. Sklyarov, A. V. Lavrenchuk, A. Mazukabzov

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引用次数: 0

摘要

西贝加尔湖地区的Olkhon地体包含四种类型的碳酸盐-硅酸盐混合物:注入(突出)、变质边界、混合和构造岩大理岩。msamuange注入露头由碳酸盐岩基质和附近发现的原生硅岩包裹体组成，通常覆盖大面积，在地图视图中缺乏明显的线性。变质杂岩类型的杂岩包括白云岩或方解石-白云岩基质中的透辉石和透辉石-透辉石碎片。其成因显然与西伯利亚克拉通被动边缘新元古代地层中石英砂岩的构造作用及相关变质作用有关。混和的混和体表现为方解石大理岩或碳酸盐硅酸盐(钙铁矿)脉，并有不同大小的变橄榄岩和花岗岩包裹体。岩脉是由碳酸盐和硅酸盐熔体侵入以及早期结晶的硅酸盐岩石破碎形成的。局限于狭窄地带的大理岩构造岩记录了大理岩后期的韧性注入。

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MARBLE MÉLANGE: COMPOSITION VARIATIONS AND FORMATION MECHANISMS

The Olkhon terrane in the Western Baikal area accommodates four types of carbonate-silicate mixtures: injection (protrusion), metamorphic-boudinated, mingling, and tectonite marble mélange. The outcrops of injection mélange consist of a carbonate matrix with inclusions of native silicic rocks found in the immediate vicinities, commonly cover large areas and lack any distinct linearity in the map view. Mélange of the metamorphic boudinage type comprises diopsidite and tremilote-diopsidite fragments in a dolomitic or calcite-dolomitic matrix. Its origin is apparently due to tectonism and related metamorphism of quartz sandstones in Neoproterozoic strata on the passive margin of the Siberian craton. Mingling mélange appears as calcite marble or carbonate-silicate (calciphyre) veins with metadolerite and granite inclusions of different sizes. The veins formed by intrusion of carbonate and silicate melt batches and subsequent fragmentation of silicate rocks that crystallized earlier. Marble tectonites localized in narrow zones record the late phase of ductile marble injection.

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.