Styles and productivity of diapirism along the Middle America margin, Part II: Mound Culebra and Mounds 11, and 12
Styles and productivity of diapirism along the Middle America margin, Part II: Mound Culebra and Mounds 11, and 12
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美洲中部边缘底辟构造的类型和生产力，第二部分：库莱布拉土丘和 11 号土丘和 12 号土丘
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Ranero
中科院分区：
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作者：
T. Moerz;N. Fekete;A. Kopf;W. Brueckmann;S. Kreiter;V. Huehnerbach;D. Masson;D. Hepp;M. Schmidt;S. Kutterolf;H. Sahling;F. Abegg;V. Spiess;E. Suess;C. Ranero
我们目前的沉积学和结构数据和概念模型的两种类型的底辟泥丘哥斯达黎加近海的演变。在边缘的光滑区域发现了数十个裸露的泥土丘，库莱布拉丘是最突出的例子。库莱布拉丘是一个断层控制的特征，具有陡峭的侧翼（10-20°），并且缺乏最近的泥浆流。挤压材料由超压实粉质粘土组成，具有强烈的脆性变形、角砾化、水力压裂和密集导管的二次穿孔迹象。南部粗糙区的特点是，有许多与海山俯冲和科科斯海脊碰撞有关的局部构造体系，所有这些都与各种形式的排气有关。底辟作用似乎只起了次要作用，11号和12号丘是断层控制的低起伏泥火山的例子，侧面倾斜较浅。泥流序列、喷口碎屑和浅层地下天然气水合物的存在有利于气驱动的幕式喷发行为。
We present sedimentological and structural data and conceptual models for the evolution of two types of diapiric mud moundss offshore Costa Rica. Dozens of exposed mud mounds are found in the smooth domain of the margin with Mound Culebra being the most prominent example. Mound Culebra is a fault controlled feature with steep flanks (∼10–20°) and a lack of recent mud flows. The extruded material consists of overcompacted silty clay with signs of intense brittle deformation, brecciation, hydrofracturing and secondary perforation by closely spaced conduits. The southern rough domain is characterized by numerous local tectonic regimes linked to seamount subduction and the collision of the Cocos ridge all associated with diverse forms of venting. Diapirism seems to play only a minor role and Mound 11 and 12 are examples of fault controlled, low relief mud volcanoes with shallow-dipping flanks. Mud flow sequences, vent debris and the presence of gas hydrates in the shallow subsurface favor an episodic, gas driven eruption behavior.