Interstitial water chemistry of sediments of the Costa Rica Accretionary Complex off the Nicoya Peninsula
Interstitial water chemistry of sediments of the Costa Rica Accretionary Complex off the Nicoya Peninsula
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尼科亚半岛哥斯达黎加增生杂岩沉积物的间隙水化学
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
C. You
中科院分区：
文献类型：
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作者：
E. Zuleger;J. Gieskes;C. You
从众多的活塞，重力和阿尔文推核心的间隙水分析表明，流体流动在哥斯达黎加增生棱镜是空间有限的，只能检测到的生物活动区的视觉定向核心。大多数取芯地点显示出快速沉积的富含有机碳的沉积物中正常成岩过程的证据，流体平流的证据很少。然而，在视觉上直接阿尔文推核心，从黑色硫化物沉积物的特点是存在的Calyptogena蛤或管虫，证据表明，流体平流向上从更深的地平线。这些区域与棱柱体上的一个大型泥火山和无序逆冲断层的带状构造有关。由于海水浓度的变化仍然相对较小，因此在这种向上的流体运动期间一定发生了与海水的大量混合。
Interstitial water analyses from numerous piston, gravity, and Alvin push cores show that fluid flow at the Costa Rica Accretionary Prism is spatially limited and can only be detected by visually directed cores in zones of biogenic activity. Most of the sites cored show evidence for normal diagenetic processes in rapidly deposited, organic carbon-rich sediments, with little evidence for fluid advection. However, in visually directed Alvin push cores, obtained from black sulfidic sediments characterized by the presence of Calyptogena clams or tubeworms, evidence for fluids advected upward from greater depth horizons is shown. These zones are associated with a large mudvolcano on the prism and with the zoes of Out Of Sequence Thrusts. As changes from sea water concentrations are still relatively small, substantial mixing with sea water must have occurred during this upward fluid movement.