西太平洋边缘海区元素地层学研究及其古海洋学意义

应用X射线萤光能谱对西太平洋边缘海区的4个钻孔的沉积物进行了元素分析。结果表明,元素在地层中的分布方式与气候变化有极大关系,存在两种模式:CaCO_3溶解区元素高含量与气候暖期一致;CaCO_3保存区,元素高含量段与气候寒冷区相对应,因此元素在地层中的分布有明确的古海洋学意义。利用元素在地层中的分布,对深海地层进行气候地层学划分与对比精度很高,称之为元素地层学。

CHARACTERISTICS OF ELEMENTS IN MARGINAL-SEA STRATA OF THE WEST PACIFIC OCEAN AND THEIR PALAEO-OCEANOLOGICAL SIGNIFICANCE

Sixteen elements(K, Ca, Fe, Ti, Mn, Cr, Sr, Pb, Vetc.) in four cores from the West Pacific Ocean were analysed using XRF. The results show that the elements change regularly and these changes are periodically similar to climatic fluctuations in this region. Two models are found in the relation between the element contents and the paleoclimate. First, in the region of CaCO3-dis-solution(Ca and Sr are contrary to other elements, the case is the same in the following.), layers with high concentrations of elements correspond to warm climatic period and those with low contents of the elements agree with cold climatic period. Second, in the region of CaCO3-preservation, layers with high concentrations of the elements are in accordance with cold climatic period and those with low contents of the elements are in agreement with warm climatic period. These relations make the elements to be of paleo-oceanological and paleoclimatic significance. Based on these relations, which may be called element stratigraphy, submarine strata can be classified and correlated paleo-oclimatically. In addition, when the climate changed from warm to cold, Mn was found to vary greatly in content, which can be a possible mark for violent change of the climate.