The Chemistry of Interstitial Waters from the Upper Ocean Crust, Site 395, Deep Sea Drilling Project Leg 78B
The Chemistry of Interstitial Waters from the Upper Ocean Crust, Site 395, Deep Sea Drilling Project Leg 78B
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深海钻探项目第 78B 段 395 号地点上层洋壳间隙水的化学成分
DOI：
10.2973/dsdp.proc.78b.114.1984
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发表时间：
1984
影响因子：
2.3
通讯作者：
R. E. McDuff
中科院分区：
文献类型：
--
作者：
R. E. McDuff
对第78 B航次期间现场取样的流体进行了化学分析。在中断五年后重新占据现场时，在395 A孔中发现的流体与当地至少400米深处的底层海水成分相同，表明水位下降。然而，在543米处没有局部的底层水成分。这个深层样品的化学性质显示镁大量耗尽，电荷平衡由钠而不是钙富集维持。钙通过方解石沉淀而损失。来自偏移孔395 B的沉积物淡水样品具有指示冰川影响的化学特征，从而将沉积物的下降速度限制在0.5 cm/y以下。
Chemical analysis of fluids sampled in situ during Leg 78B has been carried out. The fluids found in Hole 395A upon reoccupation of the site after a five-year hiatus were identical in composition to local bottom seawater to depths of at least 400 meters, suggesting drawdown. No local bottom-water component is present at 543 meters however. The chemistry of this deep sample shows a large depletion in magnesium, with charge balance maintained by sodium, rather than calcium, enrichment. Calcium is lost through calcite precipitation. A sediment interstitial-water sample from the offset Hole 395B has a chemical signature indicative of glacial influence, thereby constraining drawdown through the sediments to a velocity less than 0.5 cm/y.