Emplacement of a passive-margin evaporitic allochthon in the Betic Cordillera of Spain
Emplacement of a passive-margin evaporitic allochthon in the Betic Cordillera of Spain
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西班牙贝蒂科迪勒拉山脉被动边缘蒸发异地孔的安置
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Shengu Wu
中科院分区：
文献类型：
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作者：
J. Flinch;A. Bally;Shengu Wu
Btic Cordillera外部区域的三叠纪部分是无根的，因此是异地的。Guadalquivir异形体的前缘增生楔体主要由三叠系蒸发岩和红层组成，与上白垩统-古近纪深水沉积岩形成混杂岩系。在整个单元中，没有侏罗纪岩石。这里提出，广泛分布的Guadalquivir异地盐岩最初是作为重力异地物质在被动边缘环境中侵位的，与德克萨斯州-路易斯安那湾广泛存在的异地盐非常相似。因此，在Btic被动边缘，异地蒸发岩首先侵位于晚白垩世-古近纪。后来，在新近纪，这些蒸发岩被逆冲推覆，形成了瓜达尔基维尔异形岩。Guadalquivir异型体的示意性重建位置将原始的被动边缘异型体置于其大陆斜坡环境中。
The Triassic section of the External domain of the Betic Cordillera is rootless and thus allochthonous. The frontal accretionary wedge of the Guadalquivir allochthon consists dominantly of Triassic evaporites and red beds forming a melange with Upper Cretaceous–Paleogene deep-water sedimentary rocks. Throughout the unit, Jurassic rocks are absent. It is here proposed that the widespread Triassic evaporites of the Guadalquivir allochthon were originally emplaced as gravitational allochthonous masses in a passive-margin setting much like the widespread allochthonous salt of the Texas-Louisiana Gulf of Mexico. Thus, on the Betic passive margin, allochthonous evaporites were first emplaced during the Late Cretaceous–Paleogene. Later, during Neogene time, these evaporites were overthrusted as an accretionary wedge to form the Guadalquivir allochthon. A schematic reconstructed position of the Guadalquivir allochthon places the original passive-margin allochthon in its continental-slope setting.