Influence of the caprock on the growth dynamics of salt diapirs (southern Iran)

盖层对盐底辟生长动态的影响（伊朗南部）

• 批准号: 431893427
• 负责人: Professorin Dr. Anke Friedrich, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/431893427?language=en
• 关键词: Influence; caprock; growth; dynamics; salt

The Zagros fold and thrust belt (ZFTB) in southeastern Iran offers unique surface exposures of salt diapirs that can be directly studied in the field and by remote sensing methods over multiple scales. These structures reveal mobilized salt together with its overlying solid residuum (caprock) that reflect reactivation of several kilometer-high, columnar salt diapirs by the compressional tectonic stresses. A major aim of this bi-lateral proposal is the deeper understanding of the mechanical properties of caprock and influence of the caprock properties on the morphotectonics of the diapiric extrusions and the kinematic evolution of salt diapirs in general. The present proposal addresses the internal structure and growth dynamics of salt diapirs in the ZFTB by integrating geological field work, geochronological, geodetical and gravimetric survey datasets and geophysical data resources of the National Iranian Oil Company. Scaled analogue modelling with strain quantification system will be employed for simulating the deformation dynamics of the caprock sequences above the salt diapir extrusions. Our proposed research will improve our knowledge on: 1) the origin and composition of the caprock, 2) the deformation behaviour of the caprocks with different physical properties and their reaction on far-field and local strain, 3) the influence of caprock on short-term and long-term extrusion dynamics of underlying salt, and 4) the impact of the tectonic strain of the surrounding overburden on caprock deformation. We propose a novel and interdisciplinary approach by combining results from petrological and structural field mapping, space-geodetic measurements, geochronology, analogue modelling into a stratigraphic-geological framework model. The added value of the joint proposal lies in the multi-proxy integration of salt and caprock composition studies, measurements of active vertical surface motion with the structural mapping, geophysical measurements and modelling. Field work and data integration will be carried out jointly throughout the project. Our collaboration fosters training of early career scientists, female geoscientists, and enhances the intercultural academic exchange between German, Czech, Swiss and Iranian partners. An improved understanding of the caprock’s influence on salt dynamics will help to better understand salt dynamics in general, in particular for those systems of economic value that are not directly accessible elsewhere.

伊朗东南部的扎格罗斯褶皱和冲断带（ZFTB）提供了独特的盐底辟表面暴露，可以直接在现场进行研究，并通过遥感方法在多个尺度上。这些结构揭示了活动盐及其上覆的固体残留物（盖层），反映了挤压构造应力对几个更高的柱状盐底辟的再活化。这一双边建议的一个主要目的是更深入地了解盖层的力学性质和盖层性质对底辟挤压的形态构造和盐底辟的运动学演化的影响。本提案通过整合地质实地工作、地质年代学、大地测量和重力测量数据集以及伊朗国家石油公司的地球物理数据资源，探讨ZFTB盐底辟的内部结构和生长动态。将采用带应变定量系统的比例相似模拟方法模拟盐底辟挤压体上方盖层序列的变形动力学。我们提出的研究将提高我们的知识：1）盖层的起源和组成，2）具有不同物理性质的盖层的变形行为及其对远场和局部应变的反应，3）盖层对下伏盐的短期和长期挤出动力学的影响，以及4）周围覆盖层的构造应变对盖层变形的影响。 我们提出了一种新的和跨学科的方法相结合的结果从岩石学和构造场映射，空间大地测量，地质年代学，模拟建模成一个地层地质框架模型。 该联合提案的附加值在于将盐和盖层组成研究、主动垂直地表运动测量与结构测绘、地球物理测量和建模等多项代用指标结合起来。实地工作和数据整合将在整个项目期间联合进行。我们的合作促进早期职业科学家，女性地球科学家的培训，并加强德国，捷克，瑞士和伊朗合作伙伴之间的跨文化学术交流。更好地了解盖层对盐动态的影响，将有助于更好地了解一般的盐动态，特别是对于那些在其他地方无法直接访问的具有经济价值的系统。