苏北盆地兴化1^#钻孔沉积物磁化率特征及其古气候环境意义

Characteristics and Paleoclimatic and Paleoenvironmental Implication of Sedimentary Susceptibility of Xinghua Well 1 in North Jiangsu Basin

对苏北盆地兴化1#钻孔岩芯沉积物进行了质量磁化率的测试与分析,并对质量磁化率的变化特征和古气候环境意义进行了初步研究。研究结果表明,质量磁化率的大小变化与沉积物一定粒级组分之间有着很好的关联性;东部典型季风区域中, 质量磁化率的大小波动能很好地指示气候的波动,是恢复古气候环境演化过程的一个重要指标;以磁化率变化为主导指标的多环境代用指标指示出苏北盆地近3．20 Ma来的气候环境演化过程,且在沉积速率较高的上部的质量磁化率气候环境记录与深海 DSDP607孔氧同位素之间吻合较好,指示苏北盆地的气候环境演化过程与全球气候环境的变化具有一致性。

Based on the measurement of sediment susceptibility of the core samples from Xinghua well 1, the article has probed into the characteristics and paleoenvironmental implication of sediment susceptibility. The results show that the value of sediment susceptibility is related to the grain size of the sediments; The sediment susceptibility, to some extent, can implicate the change of paleoenvironment, which can be used as a substitute index to restore the changes of paleoenvironment in the typical monsoon area of East China; Meanwhile, taking the sediment susceptibility as the main index, combined with other environmental indices, the paper has discussed the paleoenvironmental evolution from about 3.20 Ma in North Jiangsu Basin. All the substitute proxy reveals the same paleoenvironmental information. The comparison with the δ（^18 O） record of well DSDP607 in deep water from about 1.0 Ma, indicates that the paleoenvironmental evolution of North Jiangsu Basin coincides with the paleoenvironmental record of deep water from about 1.0 Ma. This proves paleoenvironmental evolution corresponds with the evolution of paleoenvironment of the global simultaneously.