Neogene Tectonic Evolution of the Southwestern Alboran Basin as Inferred from Seismic Data Off Morocco
Neogene Tectonic Evolution of the Southwestern Alboran Basin as Inferred from Seismic Data Off Morocco
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摩洛哥近海地震数据推断的西南阿尔沃兰盆地新近纪构造演化
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Bally
中科院分区：
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作者：
A. Chalouan;R. Saji;A. Michard;A. Bally
通过对28条相交的多道地震线的分析，对地中海西部Alboran盆地西南部，包括Alboran脊（Xaouen Bank）的一部分进行了调查。地震地层学与Amoco井El-Jebha 1有关。从第四纪到中（和下？）描述了五个地震单元或亚单元。中新世。声学基底主要为阿尔伯兰带推覆体的古生代和三叠纪变质岩，局部为中中新世-墨西旦期钙碱火山。在沉积中心，沉积填充物（主要是粘土和浊积岩）的厚度超过9 km。中新世中期—托尔顿期正断层与海岸大致平行，向海或向陆倾斜。在迈西尼亚期前后的挤压期，它们大多发生倒转，在阿尔布伦岭地区形成了一套呈雁列状的北向断裂褶皱，与沿杰巴断裂离岸凸起的左旋运动有关。上新世沉降后，最后一次挤压作用使早期褶皱重新活化，并将阿尔博兰脊推至摩洛哥斜坡上。复杂的构造历史暗示了许多构造和地层潜在的油气圈闭。高分辨率地震调查可以确定新的勘探区域。
The southwestern part of the western Mediterranean Alboran Basin, including part of the Alboran ridge (Xaouen Bank), was investigated through the analysis of 28 intersecting multichannel seismic lines. The seismic stratigraphy is tied to the Amoco well El-Jebha 1. Five seismic units or subunits are described from the Quaternary to the middle (and lower?) Miocene. The acoustic basement is interpreted to be mainly Paleozoic and Triassic metamorphic rocks of the Alboran Domain nappes, and, in places, middle Miocene-Messinian calc-alkalic volcanics. In the depocenters, the thickness of the sedimentary infill (mostly clays and turbidites) exceeds 9 km. Normal faults of middle Miocene-Tortonian age are broadly parallel to the coast, and dip either seaward or landward. They were mostly inverted during pre- and post-Messinian episodes of compression, which formed a set of en echelon, north-verging faulted folds in the Alboran ridge area, in relation with sinistral movement along the offshore projection of the Jebha fault. After Pliocene subsidence, a final episode of compression reactivated the earlier folds and pushed the Alboran ridge onto the Moroccan slope. The complex structural history suggests many structural and stratigraphic potential hydrocarbon traps. A high-resolution seismic survey could lead to the definition of new exploration plays.