| 摘要: |
| 对南海北部陆架琼东沿岸泥质区S20 孔进行了岩性、粒度和常量元素分析, 初步探讨了该泥质区常量元素地球化学特征。S20 孔岩性较均一, 主要为黏土质粉砂, 研究区受相对单一而稳定的水动力条件控制。常量元素含量变化符合“元素的粒度控制律”, R 型因子分析结果表明, 第一因子P2O5, MnO,TiO2, Al2O3, Fe2O3 和K2O 等的组合, 体现了元素在表生环境中活动性差异与迁移状况, F2 因子MgO 和Na2O 组合的意义在现有研究基础上我们尚无很好的解释, 亟待矿物学方面的研究支持。均匀的岩性组成、相对稳定的元素组成表明该区沉积物适宜于古环境重建等研究。 |
| 关键词: 南海 陆架 泥质沉积 地球化学特征 粒度 S20 孔 |
| DOI： |
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| 基金项目:国家地质调查项目(1212010914002); 中国博士后基金(2005037177) |
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| Major element characteristics of east coast mud off the Hainan Island |
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| Abstract: |
| Lithology, grain-size, and major element analysis were carried out for Core S20, which was collected from the mud area off the east coast of Hainan Island. The lithology was homogenous, and was mainly composed of clay silt, indicating a relatively stable environment that extends to present day. The concentration of major elements obeyed the rule that “grain-size controlling on geochemical elements”. Based on R-model factor analysis, the first principal component had relatively high loadings of P2O5, MnO, TiO2, Al2O3, Fe2O3, and K2O, reflecting the difference of elements’ activity in hypergene environment. The second component had high loadings of MgO and Na2O, of which we have no good explanation. Furthermore, the study on mineralogy is needed. |
| Key words: the north South China Sea continental shelf mud geochemical characteristics grain-size Core S20 |
