东太平洋海隆13°N附近沉积物元素地球化学研究

IOCAS-IR > 海洋环流与波动重点实验室

	东太平洋海隆13°N附近沉积物元素地球化学研究
	袁春伟
学位类型	博士
	2007-06-08
学位授予单位	中国科学院海洋研究所
学位授予地点	海洋研究所
关键词	东太平洋海隆13°n 热液柱铁氧化物颗粒沉积物地球化学碳酸盐
摘要	对东太平洋海隆（EPR）13°N西侧2个沉积物岩芯进行了碳酸盐、常量和微量元素含量测定。E271站位沉积物中Fe含量在8.5~13.8%之间，Mn含量在1.7~3.17%之间；E272站位Fe 5.7~13%，Mn 0.12~3.31%，沉积物中高铁锰含量显示在热液柱颗粒物质在EPR13°N西翼沉降明显。E271站位CaCO3含量在5.9~27.6%之间，E272站位CaCO3含量在6.7~38.2%之间，在两个站位沉积物柱样中发现少量有孔虫化石。Cu、Pb和Zn因为热液柱颗粒物质沉降，在沉积物中富集。Cu/Fe，Pb/Fe和Zn/Fe比值比热液喷口处颗粒物中低，Pb表现出在海水中运移距离较短或者是只有少量Pb随热液柱扩散运移。热液柱沉降作用使Li，Mo和Ni在沉积物中富集。此外，铁锰氧化物颗粒在海水中吸附-共沉淀作用导致V在沉积物中富集。沉积物中Ti和Al有非常好的相关性，其Ti/Al比值为0.05左右。U在岩芯中含量与深海沉积相似。
其他摘要	Element analyses have been carried on the sediment cores from East Pacific Rise 13°N. Sediments are enrichment in Fe and Mn. Core E271 Fe contents from 8.5% to 13.8% and 5.7% to 13% in E272, Mn contents from 1.7 to 3.17% and 6 to 13% respectively, which indicate important sedimentation influence of hydrothermal plume at a distance of 25 to 45km west from EPR 13°N hydrothermal field. Carbonates also occupy an important component, E271 from 5.9% to 27.6% and E272 from 6.7% to 38.2%. A few foraminifer fossils were found in the sediment cores. The sediments enrich Cu, Pb and Zn which are fallout from hydrothermal plume with iron oxides. Cu/Fe, Pb/Fe and Zn/Fe ratio are lower than those in vent particles, besides Pb performs short transport distance or only few Pb transported with iron oxides particles. Sediments also enrich in Li, Mo and Ni as well. Further, plume supplies V to underlying sediment by scavenge from seawater. Ti and Al have a good correlation, Ti/Al ratio nearly at 0.05. A similar contains between sediments and pelagic for U.
页数	53
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/887
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	袁春伟. 东太平洋海隆13°N附近沉积物元素地球化学研究[D]. 海洋研究所. 中国科学院海洋研究所,2007.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
10001_20042800681207（1113KB）			限制开放	--	浏览