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首页> 外文期刊>Pure and Applied Geophysics >The Alpine Rif Belt (Morocco): A Case of Mountain Building in a Subduction-Subduction-Transform Fault Triple Junction
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The Alpine Rif Belt (Morocco): A Case of Mountain Building in a Subduction-Subduction-Transform Fault Triple Junction

机译：高山Rif带（摩洛哥）：以俯冲-俯冲-转换断层三重交界处的山区建筑为例

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—The Rif belt forms with the Betic Cordilleras an asymmetric arcuate mountain belt (Gibraltar Arc) around the Alboran Sea, at the western tip of the Alpine orogen. The Gibraltar Arc consists of an exotic terrane (Alboran Terrane) thrust over the African and Iberian margins. The Alboran Terrane itself includes stacked nappes which originate from an easterly, Alboran-Kabylias-Peloritani-Calabria (Alkapeca) continental domain, and displays Variscan low-grade and high-grade schists (Ghomarides-Malaguides and Sebtides-Alpujarrides, respectively), shallow water Mesozoic sediments (mainly in the Dorsale Calcaire passive margin units), and infracontinental peridotite slices (Beni Bousera, Ronda). During the Late Cretaceous?-Eocene, the Alboran Terrane was likely located south of a SE-dipping Alpine-Betic subduction (cf. Nevado-Filabride HP-LT metamorphism of central-eastern Betics). An incipient collision against Iberia triggered back-thrust tectonics south of the deformed terrane during the Late Eocene-Oligocene, and the onset of the NW-dipping Apenninic-Maghrebian subduction. The early, HP-LT phase of the Sebtide-Alpujarride metamorphism could be hypothetically referred to the Alpine-Betic subduction, or alternatively to the Apenninic-Maghrebian subduction, depending on the interpretation of the geochronologic data set. Both subduction zones merged during the Early Miocene west of the Alboran Terrane and formed a triple junction with the Azores-Gibraltar transform fault. A westward roll back of the N-trending subduction segment was responsible for the Neogene rifting of the internal Alboran Terrane, and for its coeval, oblique docking onto the African and Iberian margins. Seismic evidence of active E-dipping subduction, and opposite paleomagnetic rotations in the Rif and Betic limbs of the Gibraltar Arc support this structurally-based scenario.
机译：—Rif带与Betic Cordilleras一起在Al造山带西端的Alboran海周围形成了一个不对称的弧形山地带（Gibraltar Arc）。直布罗陀弧线由一个充满异国情调的地层（Alboran Terrane）组成，该地层冲过非洲和伊比利亚的边缘。 Alboran Terrane本身包括堆叠的尿布，这些尿布起源于东向的Alboran-Kabylias-Peloritani-Calabria（Alkapeca）大陆域，并显示出瓦里斯坎低品位和高品位片岩（分别为Ghomarides-Malaguides和Sebtides-Alpujarrides）。水中生代沉积物（主要在Dorsale Calcaire被动边缘单元中）和次大陆橄榄岩片（Beni Bousera，Ronda）。在晚白垩世始新世期间，Alboran Terrane可能位于SE浸入的Alpine-Betic俯冲带以南（参见中东部贝蒂斯的Nevado-Filabride HP-LT变质作用）。在晚始新世-渐新世期间，与伊比利亚的初期碰撞触发了变形地层以南的逆冲构造，并开始了北西北倾的亚平宁-马格里比安俯冲。根据地球年代学数据集的解释，可以将Sebtide-Alpujarride变质作用的早期HP-LT阶段称为Alpine-Betic俯冲，或称为Apenninic-Maghrebian俯冲。两个俯冲带在Alboran Terrane以西的中新世早期合并，并与Azores-Gibraltar转换断层形成了三重交界处。 N趋势俯冲段的向西回滚是内部Alboran Terrane的新近纪裂谷及其与非洲和伊比利亚边缘的同时期，斜向对接的原因。活动的电子浸没俯冲作用以及直布罗陀弧的Rif和Betic肢体中相反的古磁旋转的地震证据支持了这种基于结构的方案。

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