RARE EARTH ELEMENTS IN SEDIMENTS OF WEST PHILIPPINE SEA AND THEIR IMPLICATIONS FOR SEDIMENT PROVENANCE
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摘要: 西菲律宾海地质作用复杂,其表层沉积物稀土元素地球化学特征对其沉积物来源具有明显指示意义。基于西菲律宾海吕宋岛至九州帛琉洋脊之间海域表层沉积物样品的常量元素和稀土元素组成,通过对不同类型沉积区稀土元素组成、配分模式和稀土元素La/Yb和Sm/Eu比值进行研究发现,研究区沉积物中稀土元素组成受沉积物类型和物质来源控制,沉积物中黏土矿物、铁锰氧化物自生颗粒和磷灰石是稀土元素的主要富集相;吕宋岛与本哈姆高原之间海盆的沉积物含有来自吕宋岛蛇绿岩的物质,而中央裂谷以西海盆区和含结核黏土区沉积物主要由陆源风尘物质、海底火山物质和自生组分组成。Abstract: The composition of rare earth elements (REE) in sediments, which are effective in revealing the geochemical characters and sources of sediments, is used as a clue to understand the complex geological processes of the West Philippine Sea from the east Luzon Island to the Kyushu-Palau Ridge. Major and minor elements are analyzed. By comparing the concentrations of major and rare earth elements in addition to the REE distribution patterns in different parts of the studying area, we found that REE mainly occur with clay minerals, authigenic Fe-Mn oxide particles and apatite. The sediments in the basin between the Luzon Island and the Benham rise may contain some materials derived from ophiolites from the east of Luzon Island. The sediments in the basin to the west of the central rift and the area covered by nodules containing clays are comprised of the eolian dust from the continent,submarine volcanoes and authigenic materials.
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Key words:
- rare earth elements /
- sediment provenance /
- West Philippine Sea
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