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在第38航段挪威-格陵兰海进行了深海钻探计划,所施工的几个孔位中的孔隙水在其溶解成分和~(18)O/~(16)O组成上变化很大.研究了沉积物全样和其中粒径小于1μm的沉积物的化学成分,结果表明沉积物中存在着大量的火山灰,尤其是邻近冰岛的那些地点.自生粘土矿物(伊利石/蒙脱石)的存在说明火山灰蚀变作用是一重要作用.对348号孔位的研究揭示出溶解Ca含量递增主要是由于Ca从下伏玄武岩中向上迁移的缘故,而Mg含量和δ~(18)O(H_2O)值的降低则主要由包括沉积物中火山灰蚀变作用在内的那些反应引起.在火山物质含量较高的那些孔位中,上述地质过程已通过对溶解Sr的~(87)Sr/~(86)Sr分配的研究得到了进一步证实.另一方面,在溶解组成的化学成分几乎不受蚀变反应影响的那些地点,其~(87)Sr/~(86)Sr比值显示出与当今海水进行过彻底、广泛的交换反应.
Deep-sea drilling programs were carried out in the Norwegian-Greenland Sea at the 38th leg of the Pond, where the pore water in several of the constructed holes varied greatly in their composition and composition of ~ (18) O / ~ (16) O Full sample of sediments and the chemical composition of the sediment in which the grain size is less than 1 μm showed that there was a significant amount of volcanic ash in the sediments, especially those adjacent to Iceland.The presence of authigenic clay minerals (illite / smectite) Volcanic ash alteration is an important role.According to the study of pore size 348, it is revealed that the increase of dissolved Ca content is mainly due to the upward migration of Ca from the underlying basalt, while the Mg content and δ 18 O (H 2 O) value Is mainly caused by those reactions including alteration of volcanic ash in sediments.The above geological processes have been investigated for the dissolution of 87 Sr / ~ (86) Sr in those pores with high volcanic content ) Sr distribution has been further confirmed.On the other hand, in those locations where the chemical composition of the dissolution composition is almost unaffected by the alteration reaction, the ~ (87) Sr / ~ (86) Sr ratio shows a correlation with the current seawater A thorough and extensive exchange of reactions.