吕宋岛东部海域黏土矿物组合特征及物源分析

Assemblage and provenance of clay minerals off the east of Luzon Island

应用X射线岩石(XRD)方法对吕宋岛附近东部海域的两个重力柱状样ph03孔和ph04孔的201个沉积物样品<2μm黏土组分进行了分析。结果表明,本研究区的黏土矿物组合特征是蒙皂石含量最高(平均50%),高岭石+绿泥石次之(平均45%),伊利石含量最低(平均5%)。根据黏土矿物的矿物学特征,并结合扫描电子显微镜(SEM)和X射线能谱(EDS)分析,认为蒙皂石主要来源于吕宋岛弧基性火山物质的蚀变;高岭石大多结晶程度不好,主要来自吕宋岛屿;大部分的绿泥石来自附近吕宋岛的变质岩;伊利石可能主要以风尘形式从中国大陆搬运而来。

The mineralogy, composition, assemblage, and provenance of clay minerals off the the east of the Luzon island, were studied. 201 sediment samples of cores Ph03 and Ph04 were analyzed using XRD, and several samples were analyzed using SEM and EDS techniques. Smectite, kaolinite＋chlorite and illite were the main clay components. The results indicate that smectite is the most abundant（50%） ; kaolinite＋ chlorite is moderate（45 %）; and illite is lowest（5%）. Surface morphology and chemistry of single clay mineral particle were studied with SEM and EDS. According to the mineralogy of clay minerals, SEM and EDS, provenance study shows that smectite was origianted mainly from basalt alteration in Luzon island; kaolinite with poor crystalization was derived mainly from Luzon island; most amounts of chlorite were supplied from the metamorphic rocks on Luzon island; illite probably was derived from the China Mainland and wind was the main agent for transporting illite from land to ocean.