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Cyclic growth and mass wasting of submarine Los Frailes lava flow and dome complex in Cabo de Gata, SE Spain

机译：西班牙东南部卡波德加塔的海底Los Frailes熔岩流和穹顶复合体的周期性生长和物质浪费

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The Los Frailes Formation lava-flow and dome complex is a Miocene succession that is part of the Cabo de Gata volcanic zone of SE Spain. The complex comprises dominantly dacitic, subaqueous dome rocks and interstratified sedimentary horizons emplaced over a few tens of thousands of years. Facies of the Los Frailes Formation include coherent lava, in-situ hyaloclastite, locally with microfossil-bearing siltstone matrix, pumiceous and block-rich tuff, and massive monomict breccia and megabreccia, in which clasts are locally several metres in diameter. The monomict megabreccias display both >block facies> and >matrix facies> architecture and show internal deformation at the block-matrix contacts. They are inferred to have derived from debris avalanches. Facies are divided into four volcanic units separated by fossiliferous marine sedimentary units emplaced during hiatuses in volcanism. The Los Frailes Formation lava-flow and dome complex were emplaced in a shallow setting that may have included emergent areas. Lava flows and the margins of dome edifices interacted with sea water to form hyaloclastite, and pyroclastic currents deposited pumiceous materials. Sector collapse of marine domes fed small-volume debris avalanches with generally the same facies and distribution of facies as the larger-scale equivalents on which traditional models are built. © 2012 Elsevier B.V.
机译：Los Frailes地层的熔岩流和穹顶复合体是中新世的演替，属于西班牙东南部Cabo de Gata火山区。该综合体包括占主导地位的达吉西亚水溶穹顶岩石和成千上万年间分层的沉积层。 Los Frailes组的相包括相干的熔岩，原位透明质碎屑岩，局部含微化石的粉砂岩基质，粉状和块状凝灰岩，块状的角砾岩和巨型角砾岩，其中碎屑直径约几米。单核巨型角砾岩既显示>块相>和>矩阵相>结构，又显示块-矩阵接触处的内部变形。据推测，它们来自碎片雪崩。相被分为四个火山单元，由火山作用中断时所放置的化石海洋沉积单元隔开。 Los Frailes编队的熔岩流和穹顶复合体放置在浅层环境中，其中可能包括紧急区域。熔岩流和穹顶的边缘与海水相互作用形成透明质岩，而火山碎屑流沉积了针状物质。喂食小体积碎屑雪崩的海洋穹顶的扇形塌陷，其相貌和分布与建立传统模型的大型类似物大致相同。 ©2012 Elsevier B.V.

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