GEODYNAMICS

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2020-12-24 DOI:10.23939/jgd2020.02.051
A. V. Bartashchuk, V. Suyarko
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引用次数: 2

Abstract

Aim of the work is tectonophysical identify the totality of the deformation structures of the collisional evolutionary stage, which determine the tectonic style of the Transition Zone between Dnieper-Donets Basin and the Donbas Foldbelt. Methods. For the research, we used the author's technique for reconstructing the fields of tectonic deformations and tectonophysical analysis of geostructures. The analytical base of the research was made up of new materials of geological mapping of the territory of the transition zone between the Basin and the Foldbelt. Results. Inversion deformations of the Dnieper-Donets Paleorift were controlled by lattices of tectonites of regionally stable submeridional directions of movements. An analysis of structural patterns of tectonites indicates over the riftogenic faults of the basement in the sedimentary cover of the transition zone, echeloned stages of plumage are formed, composed of thrusts with a significant component of horizontal displacement. The tectonic style of the Transition Zone is determined by the pushing on the low dislocation autochthonous of the Basin of the repeatedly deformed, crumpled into the folds of sedimentary geomas from the Foldbelt. The allochthon structural and tectonic framework consists of thrusts, coulisse-jointed structural ensembles of thrusts, folded covers of transverse extrusion of geomas from axial to side zones, and folded covers of longitudinal thrust towards the depression. All together its form the Western Donets Cover-folded Region, the main structural element of which is the Segment of the Tectonic Wedging of geomass. The north-eastern flank of the Segment is formed by linear anticlinal zones - Torsky-Drobishivska, North-Donets, Matrossko-Toshkovska, south-western - Petrovsko-Novotroitska. The structural apex of the Segment is a tectonic junction at the ends of dynamically conjugated thrusts in the area of the joint of the salt-dome shafts of the axial part of the Basin. Scientific novelty. The tectonic inversion is responsible for the formation of three folded structural floors - the Herzinian, Laramian and Attic. According to the dynamically coupled lattice, a cover-folding system of tectonic thrusting was formed in them, which was first diagnosed as a Segment of Tectonic Wedging of geomas by the Donbas Foldbelt. On the basis of this, within the Transtition Zone, a Western-Donetsk cover-folded Region was separated, covering two tectonic areas in intensity and style of deformation of the sedimentary cover - Kalmius-Toretsky area of scaly covering in the southwestern part, which is limited to the South Donbass Melange Zone in the south, and the Lugansk-Kamyshuvakhsky area of the coulisse-jointed uplift-folding on the northeastern part, which from the north is limited by the low-folded Mesozoic-Cenozoic cover. They are separated by the Central Zone of Strike-slip control along the axial folded zone of large stage-jointed uplift-folds, which include Great-Kamyshuvakhska, Novotroitska, Druzhkovsko-Konstantinovska and Main anticlines. Practical significance. Based on the actual geo-mapping data, it is proved the riftogenic structure in the southeast of the Dnieper-Donets Paleorift is destroyed by folding at the stages of platform activation. Allocation of territory of the Western Donetsk Сover-folded Region allow to correct the scheme of tectonic zoning of the Dnieper-Donets Basin, which is the basis for modeling the geodynamics of the Transition Zone formation.
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这项工作的目的是从构造物理角度识别碰撞演化阶段的变形结构的整体,这些变形结构决定了第聂伯河-顿涅茨盆地和顿巴斯-福尔德伯特过渡带的构造样式。方法。在研究中,我们使用了作者的技术来重建构造变形场和地质结构的构造物理分析。这项研究的分析基础是由盆地和福尔德伯特过渡带地质测绘的新材料组成的。后果第聂伯河-顿涅茨河古裂谷的反转变形受区域稳定潜水运动方向的构造岩晶格控制。对构造岩结构模式的分析表明,在过渡带沉积盖层基底的裂谷断裂上,形成了羽毛的阶梯状阶段,由具有重要水平位移分量的冲断层组成。过渡带的构造样式是由Foldbelt对盆地低位错动原地的反复变形、褶皱成沉积岩褶皱而决定的。异地构造和构造格架由冲断层、冲断层的Coulise节理结构组合、岩土从轴向带侧向带横向挤压的褶皱盖层和朝向凹陷的纵向冲断层的褶皱盖体组成。它共同构成了西部顿涅茨盖褶皱区,其主要结构单元是地学构造楔段。该段的东北侧由线性背斜带形成——Torsky Drobishivska、north Donets、Matrossko Toshkovska、西南部——Petrovsko Novotroitska。该段的构造顶点是位于盆地轴向部分盐丘轴节理区域内动态共轭逆冲断层末端的构造交汇处。科学新颖性。构造反转导致了三个褶皱结构层的形成——赫尔齐尼阶、拉腊米阶和阿提克阶。根据动力学耦合格架,在其中形成了构造逆冲的盖层褶皱系统,顿巴斯-福尔德伯特首次将其诊断为岩土构造楔段。在此基础上,在Transtition带内,分离出一个顿涅茨克西部盖层褶皱区,在沉积盖层的强度和变形样式上覆盖了两个构造区——西南部的Kalmius Toretsky鳞状盖层区,仅限于南部的南顿巴斯黑化带,以及东北部库利斯节理隆起褶皱的卢甘斯克-卡米舒瓦赫斯基地区,从北部看,该地区受到中新生代低褶皱盖层的限制。它们被走滑控制的中心带沿着大型阶段联合隆起褶皱的轴向褶皱带分隔开,这些褶皱包括Great Kamyshuvakhska、Novotroitska、Druzhkovsko-Konstantinovska和Main背斜。实际意义。根据实际的地质测绘数据,证明了第聂伯河-顿涅茨古裂谷东南部的裂谷构造在平台活化阶段被褶皱破坏。顿涅茨克西部超褶皱区的领土分配可以纠正第聂伯河-顿涅茨盆地的构造分区方案,这是对过渡带形成的地球动力学建模的基础。
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Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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