海底地形特征对东菲律宾海表层黏土矿物分布的影响  

IMPACT OF SEAFLOOR TOPOGRAPHY ON DISTRIBUTION OF CLAY MINERALS IN THE EAST PHILIPPINES SEA

作　　者：黄杰[1] 万世明[1,2] 张国良[1,2] 徐兆凯[1,2] 刘华华[1] 董江[1] 李安春[1] 李铁刚[2,3] 

机构地区：[1]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,青岛266071 [2]海洋国家实验室海洋地质过程与环境功能实验室,青岛266061 [3]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,青岛266061

出　　处：《海洋地质与第四纪地质》2017年第1期77-85,共9页Marine Geology & Quaternary Geology

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"

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。We analyzed the clay mineral assemblages, contents and mineralogical characteristics for the 125 surface sediments recovered from the Parece Vela Basin. It is found that the clay minerals are mainly com- posed of smectite （average 49%）, illite （average 35%） and chlorite （average 11%） with minor kaolinite （average 5%）. Comparing the clay mineral assemblages and their crystallographic characters with the po- tential provenances, we suggest that smectite is mainly from the volcanic arc materials around the Parece Vela Basin and its distribution pattern may be mainly controlled by deep currents. Illite and chlorite are mainly derived from the Asian eolian deposits transported by wind. The spatial distribution of clay miner- als indicates that illite dominates the lower terrain, while smectite is concentrated in the higher places near the Palau ridge and the Yap ridge. With the minimal effects of the volcanic material dilution and the influ- ence of deep current erosion, the eolian flux in the deep East Philippine Sea can represent the actual contri- bution of Asian wind dust to the study area. It will be of great significance to extract the wind dust from the East Philippine Sea sediments for the further study of the paleoclimate evolution in the Asian conti- nent.

关 键 词：黏土矿物 物源 海底地形 东菲律宾海 帕里西维拉海盆 

分 类 号：P736.21[天文地球—海洋地质]