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对深海地质的研究为地质学带来了重大的变革,深海沉积柱状样的研究也大为扩展了人们对第四纪沉积环境的认识。深海沉积中的浮游生物微体化石,不仅以属种的演化变迁指示地层年代,而且以化石组合对海水的古温度变化和对深海碳酸盐溶解强度的大小反映,提供了第四纪地层划分的依据,从而能够与大陆上的冰期旋回进行对比。然而,深海地层的研究有许多特殊性,在我国几乎还属空白。 1978年国家海洋局在热带太平洋区采集了一些深海柱状样,为我国研究深海沉积提供了第一性的宝贵资料。本文仅拟对美拉尼西亚海盆的L_(1007)深水柱状样进行专门讨论。 美拉尼西亚海盆位于南半球赤道太平洋区,界于所罗门群岛与埃利斯群岛等岛屿和珊瑚礁之间,水深最大可达五千余米。而L_(1007)柱状样品取自169°57′09″E、6°01′01″S,
The research on deep-sea geology has brought great changes to geology. The researches on deep-sea sedimentary columns have greatly expanded people’s understanding of the sedimentary environment of Quaternary. The planktonic microfossils in deep-sea sediments not only indicate the age of the strata by the evolutionary evolution of the genus, but also provide the Quaternary stratigraphic division by reflecting the paleoclimatic temperature of seawater and the intensity of dissolution of deep-sea carbonate in fossil assemblages Basis, which can be compared with the glacial cycle on the continent. However, there are many peculiarities in the study of deep-sea formations, which are still almost blank in our country. In 1978, the State Oceanic Administration collected some deep-sea samples in the tropical Pacific Ocean region, which provided first-rate and valuable information for the study of deep-sea sediments in China. This article will only be devoted to the Melanesian basin L_ (1007) deep-water column-like special discussion. The Melanesian Basin is located in the equatorial Pacific in the southern hemisphere, between islands Solomon Islands and the Ellis Islands and coral reefs, the maximum depth of up to 5,000 meters. The L_ (1007) columnar sample was taken from 169 ° 57’09 “E, 6 ° 01’01” S,