Central Type Structures of South Sikhote-Alin in Probabilistic Gravity Models: Deep Structure, Rheology, Hierarchy, Fractality, and Metallogeny

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Russian Journal of Pacific Geology Pub Date : 2024-06-05 DOI:10.1134/s1819714024700027

A. M. Petrishchevsky

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Abstract

The relationships of ore districts, clusters, and fields with hierarchal subordinate central-type structures of three taxonomic levels are established from an analysis of the 3D distributions of contrast density in the crust of South Sikhote-Alin. The possible occurrence depth of fluid-magmatic sources of ore mineralization is determined from the coincidence of ore mineralization halos with the projections of deep density heterogeneities: Sn (2–6 km), Sn–polymetallic (4–12 km), polymetallic (6–20 km), and Au–W (14–24 km). The spatial location of central-type structures and related ore mineralization halos coincides with viscous shear zones, which exhibit sagging of the upper crustal level (Samarka Terrane, Kavalerovo district, and Soboliny ore cluster) and the displacement of contours of density heterogeneities in various deep sections (Dalnegorsk district). The deep boundaries of ancient continental crust and Mesozoic island-arc wedges, which are underthrust beneath accretionary–fold complexes, are determined. The combination of these structures is characterized by evident features of a transform strike-slip fault.

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概率重力模型中的南锡霍特-阿林中央型结构：深部结构、流变学、层次结构、断裂和金属成因

摘要通过对南锡霍特-阿林地壳对比密度三维分布的分析，确定了矿区、矿簇和矿田与三个分类级别的分级下属中心型构造的关系。通过矿化晕与深部密度异质性投影的重合，确定了流体-岩浆矿化源的可能出现深度：锡（2-6 千米）、锡多金属（4-12 千米）、多金属（6-20 千米）和金-金（14-24 千米）。中心型构造和相关矿化晕的空间位置与粘性剪切带相吻合，这些剪切带表现出上部地壳下陷（萨马尔卡地层、卡瓦列罗沃区和索博林矿群），以及不同深部剖面密度异质性轮廓线的位移（达尔涅戈尔斯克区）。确定了古大陆地壳和中生代岛弧楔的深部边界，这些地壳和楔在增生褶皱复合体下方。这些结构的组合具有明显的转换走向滑动断层特征。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.