Сollision第聂伯-顿涅茨凹陷的变形。第二条。构造反演的运动机制

Оleksiy Bartashchuk
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引用次数: 1

摘要

第二篇文章致力于研究第聂伯-顿涅茨凹陷构造反转的自然机制。利用西顿涅茨克地堑地区的地质填图资料,获得了西顿涅茨克地堑在海西期和阿尔贝期构造运动的碰撞作用下构造破坏的构造证据。逆变形的结果是在隆起褶皱的Lugansk-Komyshuvasky构造区内形成了西顿涅茨盖-褶皱构造区,在扇形逆冲盖区内形成了Kalmius-Toretsky构造区,并被主背斜分割。为了诊断构造反演的运动机理,利用了东欧地台南缘构造应力场重建数据和形变定量建模。由于古tetis外围挤压造山带的碰撞运动,推断第聂伯-顿涅茨盆地的构造反转开始于Zaal和Pfalz造山期。线状褶皱的形成是在亚子午方向的斜向左压应力场中以隆升-逆冲模式发生的。褶皱变形的运动机制决定了由于沉积地质体从轴向最大压缩带向“地球动力阴影”带(向凹陷两侧方向)的挤压而导致的地层纵向弯曲。在晚中生代和新生代,隆升-逆冲和走滑应力形成了阶梯式盖-逆冲和库理-节理的隆升-褶皱构造共生。根据变形构造的构造物理诊断结果,发现在西顿涅茨地堑中部压缩轴聚集的地球动力学条件下,由于覆盖褶皱异体的形成,在水平方向上地质空间缩小,剖面延伸,发生了原始的线状海西褶皱形式的弯曲变形。这些数据可以看作是顿涅茨褶皱构造侵入“构造印记”的构造反演的运动学机制。在其影响下,在坳陷与褶皱构造衔接带内,沉积地体的多次褶皱沉积形成了以浅层型横向伸展的斜斜为诊断依据的构造逆冲楔状段。在逆冲构造前缘,形成了由库利岩体节理的隆起—背斜和构造逆冲构造的褶皱板块—覆层组成的挤压褶皱带。在造山斜的顶端,在两个动力耦合的主冲断带的末端,形成了一个超前的挤压构造扇。在甲骨文的后面形成缝合线——折叠的根盖。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Сollision deformations of the Dnieper-Donets Depression. Article 2. Kinematic mechanisms of tectonic inversion
The second article is devoted to the investigation of the natural mechanisms of tectonic inversion of the Dnieper-Donets depression. Using the materials of geological mapping of the territory of the West-Donetsk graben, structural proofs of the destruction of the riftogenic structure by collision tectonic movements of Hercinian and Alpic tectogenesis were obtained. The consequence of the inversion deformations is the formation of the West Donets cover-folding tectonic region within the Lugansk-Komyshuvasky tectonic area of the uplift-folding and the Kalmius-Toretsky region of the scalloped thrust covers, which are divided by the Main anticline. For the diagnosis of kinematic mechanisms of tectonic inversion, the data of reconstruction of tectonic stress fields and quantitative modeling of deformations of the southern outskirts of the Eastern European Platform were used. It is assumed that the tectonic inversion of the Dnieper-Donets basin began in the Zaal and Pfalz phases of orogenesis due to the collision motions of the compression orogen at the outskirts of Paleotetis. The formation of linear folding occurred in the uplifting-thrust mode in the field of stresses of the oblique left-hand compression of the sub-meridional directions. The kinematic mechanism of the folded deformations determined the longitudinal bending of the layers due to the extrusion of sedimentary geomas from the zone of maximum compression in the axial part to the zones of “geodynamic shadow” – in the direction of the sides of the depression. In the late Mesozoic and Cenozoic, uplifting-thrust and strike-slip stresses formed echeloned cover-thrust and coulisse-jointed uplift-folded structural paragenesis. According to the results of tectonophysical diagnostics of deformation structures, it was found that under geodynamic conditions of clustering of compression axes in the central part of the West-Donets graben against the reduction of the geological space horizontally and extension of the section due to the formation of the cover-folded allochthon, there were flexural deformations of the primary linear Hercinian folded forms. Such data can be considered as a kinematic mechanism of tectonic inversion of the invasion of the “tectonic stamp” by the Donets folded structure. Under its influence, the wedge-shaped segment of the tectonic thrust, which was diagnosed by the orcline of the transverse extension of the shallow type, was formed by the repeatedly deposited folds of sedimentary geomas in the articulation zone between the depression and the folded structure. In the front of the thrusted were formed folded zones of extrusion of geomas, which consist of coulisse-jointed uplift-anticlines and folded plates-coverings of tectonic thrusted. At the apex of the orocline, at the end of the dynamically coupled main thrusts, an advanced tectonic fan of compression is formed. In the rearward of the oraclline formed sutures – the roots of folded cover.
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