华南雷州半岛第四纪多旋回火山岩-红土系列的层序与年代

根据大量野外剖面测量和多种测年技术(包括全溶样品铀系等时线测年法、氩-氩法、热释光法和磁性地层法),初步确定了华南沿海雷州半岛第四纪多旋回火山岩-红土系列的层位、地层关系和主要层位的年龄,将火山岩-红土系列划分为7个组,其年代跨度分别为0～0.31MaB.P、031～0.48MaB.P.、0.48～0.85MaB.P.、0.85～1.25MaB.P.、1.25～1.65MaB.P.、1.65～2.05MaB.P和2.05～2.50MaB.P..这里存在着57000a.0.1Ma、0.4Ma和0.8Ma等不同时间尺度的喷发周期,这反映了华南沿海红土所记录的古环境演化的多旋回性与黄土-古土壤系列、冰碛系列以及河-湖相系列所记录的全球变化的多旋回性有着某种程度的相似性,红土的发育和演化很可能也受控于气候-构造耦合系统,并服从于气候-构造旋回的规律.

THE STRATIGRAPHY AND CHRONOLOGY OF MULTICYCLE QUATERNARY VOLCANIC ROCK-RED SOIL SEQUENCE IN LEIZHOU PENINSULA, SOUTH CHINA

On the basis of a lot of data collected from the field in the Leizhou Peninsula South China,the stratohorizon and the contact relation between the multicycle Quaternary volcanic rock-red soil sequence has been established and their ages have been determinte by using the dating methods, such as U-series isochron dating by total-sample dissolution, Ar-Ar, TL and magnetostratigraphy etc. It is proposed that the sequence can be divided line 7 formations of which ages are 0 - 0.31MaB. P.. 0.31 - 0.48MaB. P. 0.48-0.85MaB. P.. 0.85-1.25MaB. P. l.25- l.65MaB. P. l.652.05MaB.P. and 2.05 - 2.50MaB.P., respectively. There are some types of cycle with different periods, which are 0.057Ma, 0.1Ma, 0.4Ma and 0.8Ma. It indicates there is a similar characteristic in the records of paleo-environmental evolution and global change among the red-soil sequence in South China, the loess-paleosol sequence and the hydrogenic sediment-paleosol sequence in North China, the lake sediment and the glacial till sequence in West China. The formation and evolution of the red soil sequence is probably controlled by the Coupled Climate-Tectonic System following the rule of the Climate-Tectonic Cycle.