海底地形特征对东菲律宾海表层黏土矿物分布的影响

发布时间：2018-06-02 06:06

本文选题：黏土矿物 + 物源　；参考：《海洋地质与第四纪地质》2017年01期

【摘要】：对东菲律宾海帕里西维拉海盆南部的125个表层沉积物样品的黏土矿物组成、含量及其矿物学特征进行了分析。研究结果表明,研究区黏土矿物组成以蒙脱石为主,平均含量为49%;其次是伊利石,平均含量为35%;绿泥石平均含量为11%;高岭石含量最少,平均含量为5%。通过将研究区黏土矿物组合特征与潜在物源区进行对比,并结合主要黏土矿物的结晶学特征,认为蒙脱石主要来源于帕里西维拉海盆周边的海山或海脊物质的风化和蚀变,其分布可能主要受控于底层洋流;伊利石和绿泥石主要来自于亚洲大陆,风力吹扬为其主要输运方式。黏土矿物表层分布显示伊利石主要富集于地势较低处,蒙脱石在靠近帕劳海脊和雅浦海脊等地势较高处呈现高值。由于较少受到周边海山或海脊物质稀释和底层洋流侵蚀作用的影响,东菲律宾海深水区沉积物中风尘组分通量最能代表亚洲大陆风尘对研究区的实际贡献量,这一研究将对从东菲律宾海沉积物中提取亚洲大陆风尘物质输入信号进而追溯亚洲大陆的古气候演化历史具有重要意义。
[Abstract]:The clay mineral composition, content and mineralogical characteristics of 125 surface sediment samples from the southern part of the Haipericwilla basin in the eastern Philippines were analyzed. The results show that the mineral composition of clay in the study area is mainly composed of montmorillonite with an average content of 49, followed by Illite with an average content of 35, chlorite with an average content of 11 and kaolinite with an average content of 5. By comparing the characteristics of clay mineral assemblages with potential source areas and combining with the crystallization characteristics of the main clay minerals, it is considered that montmorillonite mainly originated from weathering and alteration of seamounts or sea ridges around the Palissilla basin. The distribution of Illite and chlorite may be mainly controlled by the underlying ocean currents, and the wind blowing is the main transport mode of Illite and chlorite from the Asian continent. The surface distribution of clay minerals shows that Illite is mainly enriched in lower terrain, and montmorillonite shows high value near Palauan and Yapu ridges. Because it is less affected by the dilution of the surrounding seamounts or ridges and the erosion of the bottom ocean currents, the fluxes of wind and dust components in the sediments of the deep water area of the East Philippine Sea represent the actual contribution of the Asian continental wind dust to the study area. This study will be of great significance in retrieving the input signal of wind and dust materials from the sediments of the East Philippine Sea and tracing back the paleoclimate evolution history of the Asian continent.
【作者单位】：中国科学院海洋研究所中国科学院海洋地质与环境重点实验室;海洋国家实验室海洋地质过程与环境功能实验室;国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室;
【基金】：全球变化及海气相互作用项目(GASI-04-01-02;GASI-GEOGE-03) 中国科学院战略性先导科技专项(A类)项目(XDA11030103);中国科学院创新交叉与合作团队“海山成因;演化及深部物质循环”
【分类号】：P736

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