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Fault‐controlled base‐of‐scarp deposits
Basin Research ( IF 3.2 ) Pub Date : 2020-08-31 , DOI: 10.1111/bre.12505
Domenico Chiarella 1 , Walter Capella 1 , Sergio G. Longhitano 2 , Francesco Muto 3
Affiliation  

The term base-of-scarp is proposed for those submarine deposits controlled by a fault and physically disconnected from their more proximal counterpart located on the footwall, although genetically linked to it. These systems differ from conventional fault-controlled deltas, such as shoaland Gilberttype, because they are entirely subaqueous and lack equilibrium morphology—a steady-state in which the system grows in size without altering its shape. We present field examples of fault-controlled baseof-scarp deposits from the Crati Basin and the Messina Strait (southern Italy) consisting of clastic wedges with primary inclined bedding. Beds are composed of immature coarse-grained gravel and sand, lack structures representative of wave-action, and reflect gravity-driven processes such as debris flow, debris fall, and high-density turbidity currents. A diagram for fault-controlled deposits is presented, including their steadyand unsteady-states, and the conceptual conditions under which a base-of-scarp system might evolve into Gilbert-type or shoal-water systems.

中文翻译:

断层控制的崖底矿床

崖底这个术语是为那些由断层控制的海底沉积物提出的,它们与位于下盘的更近端的对应物在物理上断开,尽管与它有遗传联系。这些系统不同于常规断层控制的三角洲,例如 sholand Gilberttype,因为它们完全在水下并且缺乏平衡形态——系统在其中大小增长而不改变其形状的稳态。我们展示了克拉蒂盆地和墨西拿海峡(意大利南部)由断层控制的崖底沉积物的现场实例,这些沉积物由具有主要倾斜层理的碎屑楔组成。地层由未成熟的粗粒砾石和沙子组成,缺乏代表波浪作用的结构,反映了重力驱动的过程,如泥石流、泥石流和高密度浊流。
更新日期:2020-08-31
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