New discoveries of mud volcanoes on the Moroccan Atlantic continental margin (Gulf of Cádiz): morpho-structural characterization
New discoveries of mud volcanoes on the Moroccan Atlantic continental margin (Gulf of Cádiz): morpho-structural characterization
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摩洛哥大西洋大陆边缘（加的斯湾）泥火山的新发现：形态结构特征
DOI：
10.1007/s00367-012-0275-1
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发表时间：
2012
影响因子：
2.1
通讯作者：
V. Díaz
中科院分区：
文献类型：
--
作者：
R. León;L. Somoza;T. Medialdea;J. Vázquez;F. González;N. López;D. Casas;M. Pilar Mata;M. C. Fernández;C. Giménez;V. Díaz
在2008年MVSEIS-08巡航期间，利用多波束测深、反向散射成像、高分辨率地震和重力岩心数据，在摩洛哥近海大陆边缘（加的斯湾）水深750至1 600米处发现了10座新的泥火山。在所有情况下，泥角砾岩被回收，证明这些锥挤出的性质。泥火山位于两个油田：摩洛哥西部油田的MVSEIS、Moundforce、Pixie、Las Negras、马德里、瓜迪克斯、Almanzor和El Cid MVs，长期以来一直怀疑那里有泥火山，但迄今尚未查明;摩洛哥中部油田的Boabdil和Al Gacel MVs。观察到三种主要形态：不对称，次圆形和平顶锥形类型，这是加的斯湾不对称形态的第一份报告。基于形态构造分析，这些特征被解释为（1）重复的建设性（流体泥浆混合物的排出）和破坏性（重力引起的塌陷和海底滑坡）事件和（2）与底流的相互作用的结果。
During the MVSEIS-08 cruise of 2008, ten new mud volcanoes (MVs) were discovered on the offshore Moroccan continental margin (Gulf of Cádiz) at water depths between 750 and 1,600 m, using multibeam bathymetry, backscatter imagery, high-resolution seismic and gravity core data. Mud breccias were recovered in all cases, attesting to the nature of extrusion of these cones. The mud volcanoes are located in two fields: the MVSEIS, Moundforce, Pixie, Las Negras, Madrid, Guadix, Almanzor and El Cid MVs in the western Moroccan field, where mud volcanoes have long been suspected but to date not identified, and the Boabdil and Al Gacel MVs in the middle Moroccan field. Three main morphologies were observed: asymmetric, sub-circular and flat-topped cone-shaped types, this being the first report of asymmetric morphologies in the Gulf of Cádiz. Based on morpho-structural analysis, the features are interpreted to result from (1) repeated constructive (expulsion of fluid mud mixtures) and destructive (gravity-induced collapse and submarine landsliding) episodes and (2) interaction with bottom currents.