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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Cyclic growth and mass wasting of submarine Los Frailes lava flow and dome complex in Cabo de Gata, SE Spain
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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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摘要

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. Fades of the Los Frailes Formation include coherent lava, in-situ hyalodastite, locally with microfossil-bearing siltstone matrix, pumiceous and block-rich tuff, and massive monomict breccia and megabreccia, in which dasts are locally several metres in diameter. The monomict megabreccias display both "block fades" and "matrix fades" 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 hyalodastite, and pyrodastic 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.
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组的外观包括相干的熔岩，原位玻尿石，局部含微化石的粉砂岩基质，粉状和块状凝灰岩，以及块状单角砾岩和巨型角砾岩，其中局部分布有几米直径。单核巨型角砾岩既显示“块衰落”又显示“矩阵衰落”结构，并在块矩阵接触处显示内部变形。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石，并且火山岩流沉积了针状物质。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。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2012年第15期|p.72-86|共15页
  • 作者

    Carles Soriano; Nancy Riggs; Guido Giordano; Massimiliano Porreca; Sandro Conticelli;

  • 作者单位

    Institut de Ciencies de la Terra Jaume Almera, CSIC, c/ Lluis Sole Sabaris sin, Barcelona 08028, Spain;

    Department of Geology, Northern Arizona University, Flagstaff AZ 860011, USA;

    Dipartimento di Scienze Geologiche, Universita degli Studi Roma Tre, Largo S. Leonardo Murialdo 1, 00146, Roma, Italy;

    Centro de Vulcanologia e Avaliacao de Riscos Geologicos (CVARG), Departamento de Geociencias, Universidade dos Acores, Complexo Cientifico, 2~ο Piso, 9500-801 Ponta Delgada, Portugal;

    Dipartimento di Scienze della Terra, Universita degli Studi di Firenze, Via G. La Pira, 4,1-50121, Firenze, ItalySezione di Firenze of the Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via G. La Pira, 4,1-50121, Firenze, Italy;

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  • 正文语种 eng
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  • 关键词

    sector collapse; debris avalanche; submarine domes; pumice flow;

    机译：部门崩溃;碎片雪崩;潜水艇圆顶浮石流;

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