Geotectonics最新文献

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Digital Models of the Deep Structure of the Earth’s Crust in the Eurasian Basin of the Arctic Ocean 北冰洋欧亚盆地地壳深层结构数字模型

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-12-01 DOI: 10.1134/s0016852123070051

Abstract—

Digital models of the deep structure of the Earth’s crust are developed based on the method of gravity modeling, taking the accumulated geophysical data on the Eurasian Basin of the Arctic Ocean into account. The digital models of the basement relief and sedimentary cover thickness in the Eurasian Basin are calculated on the basis of reinterpretation of depth multi-channel reflection seismic cross-sections and 2D gravity modeling. The digital models of the Moho surface relief and the thickness of the Earth’s crust are calculated using the improved 3D gravity modeling method. It is shown that the reason for the deepening of the basement in the Nansen Basin by 1–1.5 km in comparison with the Amundsen Basin is a larger volume of accumulated sedimentary cover in the Nansen Basin, with a similar crustal thickness of ~4.8 km in both basins. The characteristics of the oceanic crust studied on the basis of the obtained digital models reveal a complex 3D variability typical of ultraslow spreading ridges. In the region of the Gakkel Ridge, which was formed at full rates of spreading of less than 12 mm/year, the maximum spread of crustal thicknesses occurs and the tectonic factor dominates over the magmatic one during the accretion of the oceanic crust. This manifests itself in the formation of extended submarine ridges parallel to the amagmatic segments of the ridge.

摘要- 根据重力建模方法，并考虑到积累的北冰洋欧亚盆地地球物理数据，建立了地壳深部结构数字模型。根据对深度多道反射地震断面的重新解释和二维重力建模，计算了欧亚盆地基底起伏和沉积覆盖层厚度的数字模型。利用改进的三维重力建模方法计算了莫霍面地表起伏和地壳厚度的数字模型。结果表明，南森盆地的基底比阿蒙森盆地加深了 1-1.5 千米，原因是南森盆地的沉积覆盖层累积量较大，而两个盆地的地壳厚度相近，均为约 4.8 千米。根据获得的数字模型研究的大洋地壳特征显示，超低扩张脊具有典型的复杂三维变化。在以小于 12 毫米/年的完全扩张速率形成的加克尔海脊区域，地壳厚度出现了最大程度的扩散，在大洋地壳的增生过程中，构造因素比岩浆因素占主导地位。这表现为与海脊的岩浆段平行的延伸海底海脊的形成。

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引用次数: 0

Tectonic Implication and Geometry of the Minor Folds in Qaiwan and Goizhah Anticlines, Northeast of Sulaimani District, Northeastern Iraq 伊拉克东北部苏莱曼尼地区东北部柴湾和戈伊扎背斜小褶皱的构造意义和几何构造

4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-10-19 DOI: 10.1134/s0016852123050035

S. H. S. Al-Hakari

引用次数: 0

Neotectonic Indications in Iraq (North of the Arabian Plate): Analytical Overview 伊拉克(阿拉伯板块以北)新构造指示:分析综述

4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-10-19 DOI: 10.1134/s0016852123050060

V. K. Sissakian, A. A. Ghafur, L. H. Abdullah, N. Al-Ansari, J. Laue

引用次数: 0

Tectonically Stable Parts in Iraq Are Not Stable 伊拉克构造稳定的部分并不稳定

4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-10-19 DOI: 10.1134/s0016852123050072

V. K. Sissakian, N. A. Al-Ansari, L. H. Abdullah, J. Laue

Abstract Iraq is located in the extreme northeastern part of the Arabian Plate, which is in collision with the Iranian (Eurasian) Plate. The collision, which is still ongoing has created tens of folds some of which exhibit different types of faults. The exerted compressional forces are believed to be decreasing southwestwards as being far from the collision area (Suture Zone). Accordingly, all the existing tectonic and geological maps compiled by different authors and all the existing published articles, reports and books have considered two main tectonic domains in Iraq. The Stable Shelf and Unstable Shelf or Inner Platform and Outer Platform. The contact between these two main divisions follows almost the Euphrates River; towards the west of the river is the tectonically Stable area and towards the east and north is the tectonically Unstable area, which means the presence of different structural forms. In the current study, we have recognized tens of different Neotectonic evidence in the Stable part indicating that the area is tectonically not stable. Among those indications are abandoned valleys, development of sinkholes along certain lineaments, bending of valleys in right angles, and development of nick-points in valleys along certain lineaments.

伊拉克位于阿拉伯板块的最东北部，与伊朗(欧亚)板块碰撞。这次碰撞仍在进行中，形成了数十个褶皱，其中一些褶皱表现出不同类型的断层。由于远离碰撞区(缝合带)，所施加的压缩力向西南方向减弱。因此，由不同作者编制的所有现有构造和地质图以及所有现有发表的文章、报告和书籍都考虑了伊拉克的两个主要构造域。稳定架和不稳定架或内平台和外平台。这两个主要地区之间的联系几乎沿着幼发拉底河;西侧为构造稳定区，东侧和北侧为构造不稳定区，存在不同的构造形态。在目前的研究中，我们在稳定区发现了数十种不同的新构造证据，表明该地区构造不稳定。这些迹象包括废弃的山谷，沿某些地形发育的陷坑，山谷成直角弯曲，以及沿某些地形发育的山谷中的缺口点。

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引用次数: 0

Oceanic Crust Formation in the Mid-Atlantic Ridge Segment between Azores and Icelandic Plumes: Results of Geological and Petrogeochemical Studies 亚速尔群岛和冰岛羽流之间的大西洋中脊部分的洋壳形成：地质和岩石地球化学研究结果

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-10-01 DOI: 10.1134/s0016852123050084

Abstract

The structure of the ocean floor and the composition of basalts and dolerites of the MAR segment between the Maxwell and Charlie Gibbs FZs (North Atlantic) were studied based on the data obtained during the 53rd cruise of the R/V Akademik Nikolaj Strakhov organized and performed by the Geological Institute of the Russian Academy of Sciences over the period of July 7–August 15, 2022. In this segment, areas of greater and lesser magmatic productivity, which correspond to higher and lower bottom relief, alternate along the spreading axis. In high-relief areas, spreading cells form in the axial zone, and rises of tectonic and volcanic genesis dominate in the crest zone. In low-relief areas, the rift valley consists of deep rift basins; low ridges are developed on the flanks, which are separated by wide depressions. Oceanic N- and T-type tholeiites and E-MORB-type basalts and dolerites are distinguished among the studied volcanics. The N-tholeiites are widespread and were derived from mainly depleted mantle (source of DM). E-MORB-type basalts and dolerites are found in high-relief areas. Their mantle substrate is formed by a mixture of DM and EM-2 material with the subordinate role of HIMU. T-MORB volcanics are mainly localized on large volcanic rises in the southern part of the studied MAR segment and were melted from a substrate formed by a mixture of DM and HIMU material with the subordinate role of EM-2. Two types of mantle inhomogeneities involved in melting are reconstructed: passive and active. The former are represented by blocks of the transformed continental lithosphere that are similar in composition to the EM-2 mantle source. Active inhomogeneities associate with the uplift near Maxwell FZ of the microplume of the enriched mantle with a composition close to HIMU and with its subaxial flow in the north direction up to the Charlie Gibbs FZ.

摘要根据俄罗斯科学院地质研究所于 2022 年 7 月 7 日至 8 月 15 日组织和实施的 Akademik Nikolaj Strakhov 号考察船第 53 次航行期间获得的数据，研究了 Maxwell 和 Charlie Gibbs FZ 之间 MAR 区段（北大西洋）的洋底结构以及玄武岩和辉绿岩的成分。在这一区段，岩浆生产力较高和较低的地区（相当于较高和较低的底部起伏）沿扩张轴交替出现。在高低起伏区，轴向区形成扩张单元，峰顶区则以构造和火山成因的隆起为主。在低起伏地区，裂谷由深裂盆地组成；侧翼形成低山脊，山脊之间有宽阔的洼地相隔。在所研究的火山岩中，有大洋型 N 型和 T 型透辉岩以及 E-MORB 型玄武岩和辉长岩。N 型透辉岩分布广泛，主要来自贫化地幔（DM 的来源）。E-MORB型玄武岩和辉长岩分布在高凸起地区。它们的地幔基质由DM和EM-2物质混合形成，HIMU起辅助作用。T-MORB火山岩主要分布在所研究的MAR段南部的大型火山隆起上，由DM和HIMU物质混合形成的地幔基质熔融而成，EM-2起辅助作用。参与熔化的地幔不均匀性有两种类型：被动型和主动型。前者由转化的大陆岩石圈块体代表，其成分与 EM-2 地幔源相似。主动非均质性与富集地幔微积层在麦克斯韦FZ附近的隆起有关，其成分接近HIMU，并与其向北的次轴向流动有关，直至查理-吉布斯FZ。

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引用次数: 0

Morphotectonic Analysis of Sub-Basins along the North Termination of Anar Fault, Yazd Block, Iran 伊朗亚兹德地块阿纳尔断裂北端次盆地形态构造分析

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-08-29 DOI: 10.1134/s0016852123040076

E. Gholami, P. Vaghari, M. Khatib, A. Faghih

引用次数: 1

Basement Faults Effect on the Folding Style: A Case Study from Hendurabi Fault, Zagros, Iran 基底断裂对褶皱样式的影响——以伊朗扎格罗斯地区亨杜拉比断裂为例

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-08-29 DOI: 10.1134/s0016852123040064

S. Ghalandari, Z. Maleki, M. Arian, A. Solgi, M. Aleali

引用次数: 0

Extension Magnitude and Ratio of Central and South Segments in South Atlantic Margins 南大西洋边缘中南段的伸展幅度和比率

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-08-29 DOI: 10.1134/s001685212304012x

H. A. Suhail, Q. Nie, X. Q. Zhang, A. Akbar, G. Aliyeva

引用次数: 0

Tectonic Framework of Central Sinai (Egypt) Using Geophysical and Seismological Data 利用地球物理和地震资料研究埃及西奈半岛中部的构造格架

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-08-29 DOI: 10.1134/s0016852123040088

H. Hamed, S. Araffa, H. S. Sabet, M. Abu Bakr, M. E. Mebed

引用次数: 0

Fault Striae Analysis and Paleostress Reconstruction of the Northern Tectonic Province (Egyptian Nubian Shield): Insights into the Brittle Deformation History of the Northern East African Orogen 北部构造省（埃及-努比亚地盾）的断层条纹分析和古应力重建——对东非造山带北部脆性变形史的洞察

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics

Pub Date : 2023-08-29 DOI: 10.1134/s001685212304009x

Z. Hamimi, H. E. El Sundoly, D. Delvaux, A. Waheeb, W. Hagag, M. Younis

引用次数: 0

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