Salt-pillow formation during inversion of evaporite-filled half graben – Insights from seismic data interpretation and integrated analogue-numerical modelling

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
P. Krzywiec , M. Adamuszek , L. Filbà , M.G. Rowan , O. Ferrer
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引用次数: 0

Abstract

The Mid-Polish Anticlinorium is a regional structure that formed during Late Cretaceous inversion of the Permian-Mesozoic Polish Basin. Within the anticlinorium, local salt pillows built of the Upper Permian (Zechstein) evaporites are often located above reverse faults that accommodated basement inversion. Seismic data from the Szubin area in central Poland were used to guide a combined analogue and numerical modelling study to test whether locally thicker evaporites deposited within a half-graben, could indeed give rise to a salt pillow formed above the half-graben's hanging wall during its inversion. The results of the two approaches are internally consistent and prove that such a genetic relationship is fully viable, with the most important variables being the size of the half-graben, the viscosity of the salt, and the presence of any erosion of the pillow structure. Thus, the existence of salt pillows along the major inversion zones of the Mid-Polish Anticlinorium could possibly be used as indicators for the location of syn-depositional half-grabens during deposition of the Zechstein evaporites. This in turn might suggest that even in the basin center, shallower areas might have existed above the footwalls of such half-graben during Zechstein deposition, characterized by smaller thicknesses and somewhat different facies arrangement. Similar concepts likely apply to other intracontinental salt basins that experienced rifting and then inversion.

蒸发岩填充的半地堑反演过程中的盐枕形成--地震数据解释和模拟-数值综合建模的启示
波兰中部反褶带是二叠纪-中生代波兰盆地晚白垩世反转过程中形成的区域性构造。在反褶带内,由上二叠统(Zechstein)蒸发岩形成的局部盐柱通常位于容纳基底反转的逆断层之上。波兰中部 Szubin 地区的地震数据被用来指导模拟和数值模拟相结合的研究,以检验在半沟谷内沉积的局部较厚蒸发岩是否真的会在反转过程中在半沟谷悬壁上方形成盐枕。两种方法的结果内在一致,证明这种遗传关系是完全可行的,最重要的变量是半沟谷的大小、盐的粘度以及是否存在对盐枕结构的侵蚀。因此,沿波兰中部反褶带主要反转带存在的盐枕有可能被用作泽希施泰因蒸发岩沉积过程中同步沉积半格堑位置的指标。这反过来可能表明,即使在盆地中心,在泽赫斯泰因沉积过程中,这种半堑墙脚上方也可能存在较浅的区域,其特点是厚度较小,岩相排列略有不同。类似的概念可能也适用于其他经历过断裂和反转的大陆内部盐盆地。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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