Seismogenic Structures in Sediments of Different Lithological Composition and Their Position in Mesozoic–Cenozoic Sections of the Northern Caucasus

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2023-11-14 DOI:10.1134/S0024490223700323

Yu. O. Gavrilov, Yu. R. Gatatdinova

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Abstract—

A comparative analysis of the morphological features of horizons affected by paleoearthquakes revealed significant difference of seismites from lithologically different deposits. Powerful earthquakes determine not only the destruction of the sedimentary structure of near-surface deposits and their chaotic mixing, but also actively affect the underlying layers to a depth of several tens of meters; since the degree of diagenetic lithification of rocks in different horizons varies with depth, the nature of their seismogenic transformations also changes. It was found that major seismic events were associated with the time intervals of tectonic and paleogeographic restructuring of sedimentation basins, which consisted in the intensification of the basin floor subsidence and changes in the composition of sediments accumulated in the paleobasin. A special type of seismites was formed during the impact of earthquakes on siliceous deposits, which have been spanned by the diagenetic redistribution of authigenic mineral matter in a gel state.

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北高加索地区中、新生代不同岩性沉积物的发震构造及其位置

摘要/ abstract摘要:通过对古地震影响层位形态特征的对比分析，发现不同岩性沉积的震积岩具有显著差异。强震不仅决定了近地表沉积物的沉积结构的破坏及其混沌混合，而且积极影响下伏层至几十米深处;由于不同层位岩石的成岩岩化程度随深度不同而不同，因此其孕震转化的性质也不同。研究发现，主要地震事件与沉积盆地构造和古地理重构的时间间隔有关，表现为盆地底沉降加剧和古盆地沉积成分的变化。一种特殊类型的震积岩是在地震作用于硅质矿床的过程中形成的，这些硅质矿床是由自生矿物以凝胶状态成岩重新分布而成的。

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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.