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Soft Sediment Deformation Structures in Quaternary Sediments from Dadra and Nagar Haveli, Western India
Journal of the Geological Society of India ( IF 1.3 ) Pub Date : 2020-05-01 , DOI: 10.1007/s12594-020-1462-8
Naveen Kumar , Kapil Mohan , Rakesh K. Dumka , Sumer Chopra

Quaternary sediments are preserved in disconnected patches along the middle and lower reaches of major river valleys like Damanganga, Par, Ratakhadi and Dongarkhadi in the Dadra and Nagar Haveli region of Konkan coastal belt, Western India. These deposits mainly consist of stratified sand, silt, clay and gravel beds. The study area has been earlier affected by moderate earthquakes. The identified soft-sediment deformation structures (SSDS) are mainly developed in the sand silt, sand gravel and clay beds; and includes intrusive sedimentary bodies (dykes and sills), slump structures, suspended clast blocks and convolute structures. The nature, shape and dimension of SSDS suggest that the trigger mechanism and driving forces for the origin of these structures were seismic shock waves. Sediment loading and storm events as a trigger for the SSDS are less likely the reason and the proximity of these structures to the faults support the inference that it may be of seismic origin. Deformation in the Quaternary sediments of Dadra and Nagar Haveli imply the presence of neotectonic activity and points to an earthquake of magnitude >5.5 that struck the study area after sediment deposition.

中文翻译:

印度西部达德拉 (Dadra) 和纳加尔哈维利 (Nagar Haveli) 的第四纪沉积物中的软沉积物变形结构

在印度西部康坎海岸带的达德拉和纳加尔哈维里地区的达曼甘加、帕尔、拉塔卡迪和东加尔卡迪等主要河谷的中下游,第四纪沉积物保存在不连续的斑块中。这些矿床主要由层状砂、粉砂、粘土和砾石层组成。研究区较早受到中等地震的影响。已识别的软沉积物变形构造(SSDS)主要发育于砂质粉砂层、砂砾层和粘土层;包括侵入沉积体(岩脉和岩床)、塌陷结构、悬浮碎屑块和回旋结构。SSDS 的性质、形状和尺寸表明这些结构起源的触发机制和驱动力是地震冲击波。沉积物加载和风暴事件作为 SSDS 的触发因素不太可能是原因,而且这些结构与断层的接近程度支持了它可能是地震起源的推论。Dadra 和 Nagar Haveli 第四纪沉积物的变形意味着存在新构造活动,并表明在沉积物沉积后袭击了研究区域的 5.5 级以上的地震。
更新日期:2020-05-01
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