A Gravity-Derived Moho Model for the Sikhote Alin Orogenic Belt

Диденко, А. Н.; Nosyrev, M. Yu.; Гильманова, Г. З.

doi:10.1007/s00024-021-02842-8

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…Наряду с данными сейсмических профилей сведения о глубинном строении регионов могут и извлекаются из данных потенциальных полей. Так современные модели гравитационного поля активно и плодотворно применяются в геологических построениях, при этом, в основном, используются построения в редукциях Фая, хорошо отражающие морфологию регионов, и в редукции Буге -для изучения границы Мохоровичича [30,34,35]. В работе [34] для Сихотэ-Алиньского региона по данным двумерного анализа спектра мощности гравитационного поля, основанного на цифровой модели гравитационного поля Буге, были получены сведения о мощности земной коры (глубины границы Мохоровичича).…”

Section: восточно-сихотэ-алиньский вулканоплутонический поясunclassified

Deep Seismic Structure of the Pacific Tectonic Belt Along the 8-Dv Reference Profile

Soloviev,

Salnikov,

Seleznev

et al. 2024

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The article presents the results of deep seismic studies over the Sikhote-Alin fragment of the 8-DV reference geophysical profile running across the large fold structures of the Pacific tectonic belt, that is, the Sikhote-Alin orogenic belt with the superimposed Middle Amur sedimentary basin and the East Sikhote-Alin volcanoplutonic belt. A deep seismic section of the Earth's crust and upper mantle with the distribution of longitudinal wave velocities is constructed. In the upper part of the section, P-wave velocities vary from 4.0–5.0 km/s within the Middle Amur sedimentary basin and the eastern part of the Eastern Sikhote-Alin volcanoplutonic belt to 5.5–5.6 km/s in the central part of the Sikhote-Alin orogenic belt. It is found that the thick Paleozoic assemblage of sediments within the Middle Amur sedimentary basin is complexly faulted and folded. Crystalline rocks with compressional wave velocities of 6.0–6.2 km/s occur at depths of 8 to13 km in different parts of the Middle Amur sedimentary basin and at depths of 4 to 6 km within the Sikhote-Alin orogenic complex. Compressional wave velocities of the crust in the Sikhote-Alin fragment of the 8-DV profile are between 6.3 and 6.35 km/s. The crust varies in thickness from 32–34 km in the northern part of the fragment to 36–37 km in its central and eastern parts. Along the Moho, P-wave velocities are 8.1 to 8.3 km/s; a number of areas of reduced Vp from 7.8 to 8.0 km/s were identified in the junction zones of large crustal blocks. P-wave data were used to identify anomalies which were correlated with structural-tectonic zones, deep fault zones, and seismicity. Thus, along the deep Central Sikhote-Alin fault, the Middle Amur basin is identified, which is infilled by low-velocity sediments of considerable thickness, with Paleozoic sediments shifted to between 4 and 5 km at its junction with the Sikhote-Alin orogenic. Zones of increased heterogeneity in the upper crust projected onto the area within the contours of the Middle Amur sedimentary basin are characterized by increased seismicity.

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Section: восточно-сихотэ-алиньский вулканоплутонический поясunclassified

Deep Seismic Structure of the Pacific Tectonic Belt Along the 8-Dv Reference Profile

Soloviev,

Salnikov,

Seleznev

et al. 2024

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“…5). Положение границы Мохо взято нами по работе [25], где расчет ее глубин выполнен на основе спектрального анализа поля силы тяжести.…”

Section: плотностная модельunclassified

Structure of the Earth’s Crust and Lithospheric Mantle in the Central Part of the Lower Amur Mineragenic Zone and Patterns in Hard Rock Gold Distribution Within the Zone

Nosyrev¹,

Диденко²,

Гильманова³

2023

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In this study, we consider the features of the deep structure of the Earth’s crust and the lithospheric mantle in the central part of the Lower Amur mineragenic zone and in the area that flanks on the zone from the west, including the Albazinsky gold ore cluster. Zones with a sharp change in density and magnetic properties associated with Late Cretaceous-Early Paleogene magmatism were established based on the calculated density and magnetic depth models of the territory. A ring structure ~200 km across was identified, which is characterized by the low-density lithospheric mantle and density and magnetic inhomogeneities in the Earth’s crust associated with a wide development of intrusive bodies within it, as well as their attitude and composition. The spatial relation of gold ore districts, clusters and deposits to density and magnetic inhomogeneities in the crust and lithospheric mantle is analyzed and the main patterns in their occurrence are shown. As a rule, they are confined to the low-density zones in the crust and marginal areas of deep (12–20 km) magnetic intrusions. Based on the findings, new promising areas to prospect for gold deposits are proposed. In particular, it was concluded that the potential to host gold mineralization was underestimated for the western part of the ring structure south of the Albazino deposit.

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“…1 -изолинии мощности литосферы (км) [47]; 2 -изолинии мощности земной коры (км) [55]; 3 -региональные разломы, по [14], 4 -зоны сжатия по анализу магнитного поля; 5 -границы минимумов силы тяжести. Светло-серым цветом показаны области повышенной мощности земной коры больше 36 км, темно-серым цветом -больше 40 км.…”

Section: сравнительный анализ линейных элементов рельефаunclassified

Comparative Analysis of Linear Elements of the Relief and Geophysical Fields of the Bureya and Sikhote-Alin Orogens

Merkulova¹,

Gil׳manova²

2022

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The Bureya and Sikhote-Alin orogens located in the northeast of the Amurian Plate are characterized by different levels of seismic activity. The analysis of the structure of the orogens based on the geophysical data and the study of the features of the relief using the WinLess program yielded the lines of the prevailing elongation of rose diagrams, lineaments, the density of lineaments of the diagonal systems, the total lineament density as an indicator of tectonic disturbance of the upper crust. On the basis of these data, it was established that both orogens are subject to tectonic impact of external sources (zones of the Indo-Asian interaction and the Pacific Plate), but the intensity of the process in the Bureya orogen is higher. The tectonic disturbance of the near-surface horizons of the earth’s crust in the Bureya orogen is also increased in comparison with the Sikhote-Alin orogen. The first orogen is characterized by large zones with maximum total density of northeast- or northwest-oriented lineaments localized along the axial line of the orogen; in the second case, there is a series of smaller zones of maximum density of lineaments with different directions randomly distributed throughout the orogen. The analysis of the relief, the crustal thickness and the magnetic field reveals compression regimes in the northern part of the Bureya orogen and the southern part of the Sikhote-Alin orogen and the transition from compression to extension in the other parts of the orogens.

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A Gravity-Derived Moho Model for the Sikhote Alin Orogenic Belt

Cited by 16 publications

References 28 publications

Deep Seismic Structure of the Pacific Tectonic Belt Along the 8-Dv Reference Profile

Deep Seismic Structure of the Pacific Tectonic Belt Along the 8-Dv Reference Profile

Structure of the Earth’s Crust and Lithospheric Mantle in the Central Part of the Lower Amur Mineragenic Zone and Patterns in Hard Rock Gold Distribution Within the Zone

Comparative Analysis of Linear Elements of the Relief and Geophysical Fields of the Bureya and Sikhote-Alin Orogens

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