西菲律宾海晚第四纪沉积地球化学特征

LATE QUATERNARY SEDIMENTARY GEOCHEMICAL CHARACTERISTICS OF THE WEST PHILIPPINES SEA

对1988年取自西菲律宾海区的3个沉积物柱样进行系统的地球化学研究。结果表明，本区的沉积物属半远洋沉积物，其地球化学特征受控于陆源沉积作用、海洋生物沉积作用和海底火山沉积作用。据主要化学元素和CaCO3的柱状变化进行地层划分和古气候的恢复，区分出末次冰期的亚间冰期沉积、冰期最盛期沉积和全新世沉积。本区的CaCO3变化表现出两种类型，WP1柱样属大西洋型溶解旋回；WP2和WP40柱样属太平洋型溶解旋回。

Studies on three cores sampled from the Western Philippines Sea in 1988, sliowed that the sediments of the studied area are semi-ocean deposit, whose geochemical characteristics are controlled by terrigenous deposition, marine biological deposition and submarine volcanic deposition. The main chemical elements and the vertical variation of CaCO3 were used as basis to divide the stratum and restore the palaeoclimate, the differentiated deposits in the sub-interglacial epoch, the glacial maximum epoch in the last ice age, and the deposits in the Holocene. There are two types of CaCO3 variation in this area. Core WP1 belongs to Atlantic solution cycle,and cores WP2 and WP40 to Pacific type.