On the structure and evolution of the Sorbas basin, S.E. Spain

On the structure and evolution of the Sorbas basin, S.E. Spain
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关于索尔巴斯盆地的结构和演化,S.E.

DOI:
10.1016/j.tecto.2019.228230
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Valetti L
Valetti L
中科院分区:
地球科学2区
文献类型:
--
作者:
Valetti L

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地质测绘和重力测量被用来限制塞拉瓦利和托顿(美国)的形状。中新世)岩石的Sorbas盆地,西班牙东南部,因此,其构造演化和在整个区域构造方案的位置。现今盆地底部形成一个向西加深的槽,深约2.0 km,主要充填碎屑浊积岩和块状流沉积。盆地充填岩在堆积过程中经历了广泛的ENE-WSW延伸,在Sierra Cabrera东侧发生了伸展断层。声速测量表明,岩石物理的影响,同沉积变形。沉积后,但在隆起和侵蚀之前,沉积物被折叠成一个大规模的单斜结构,推断已形成的重力滑动的沉积物上升的西翼的塞拉利昂卡布雷拉。在晚托顿时期,基底块体向南隆起3公里,与伸展相关,该褶皱结构发生变形和旋转,然后发生侵蚀和洪水,形成浅海的梅西尼亚层序,部分掩埋了较老的岩石。地球动力学背景是直布罗陀弧俯冲带的塞拉瓦利-托顿回滚所产生的弧后部分(贝蒂克带)。它以南部的Carboneras伸展转换断层为界,该断层在Sorbas盆地内积累了约40 km的左旋偏移,并伴随着沉积物沉积和变形。这些事件被推断为与地球动力学有关。
Geological mapping and gravity surveying were used to constrain the shape of the Serravallian and Tortonian (U. Miocene) rocks of the Sorbas basin, SE Spain, and hence its tectonic evolution and place in the overall regional tectonic scheme. The present-day basin floor forms a westerly-deepening trough ∼2.0 km deep, infilled with mainly clastic turbidites and mass-flow deposits. Basin-fill rocks underwent broadly ENE-WSW extension during accumulation, with extensional faulting on the flank of the Sierra Cabrera to the east. Acoustic velocity measurements demonstrate a petrophysical impact of the syndepositional deformation. Post-deposition but prior to uplift and erosion, the sediments were folded into a large-scale monoclinal structure, inferred to have formed in response to gravitational sliding of sediments off the rising western flank of the Sierra Cabrera. This fold structure was deformed and rotated by 3 km of extension-related uplift of the basement block to the south during late Tortonian time, then erosion and flooding to produce a shallow-marine Messinian sequence, partially burying the older rocks. The geodynamic setting was the back-arc sector (the Betic zone) produced by Serravallian-Tortonian rollback of the Gibraltar arc subduction zone. It is bounded to the south by the Carboneras stretching transform fault, that accumulated about 40 km of left-lateral offset coevally with sediment deposition and deformation within the Sorbas basin. These events are inferred to be geodynamically linked.
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