摘要
本文通过实测的中—新生代含油气盆地中不同层位岩石K-Ar法表面年龄的变化,受沉积盆地重矿物反剖面序列的启迪,提出了沉积盆地地球化学反剖面序列的概念,并讨论了它们的存在前提和形成机制.进而阐述了地球化学反剖面序列的应用.
The K-Ar ages of deffercnt rocks in the Meso-Cenozoic basins bearing oil-gas were measured.Depend upon the age data the inverse sequence of geochemical section was found just as which was set up based on heavy minerals. The prerequisite for discussing the inverse sequence of geochemical section is that strata in basins underwent tectogensis marked by vertical movement and weaker diagenesis. There are the conditions in some Meso-Cenozoic basins in China.The upper strata of normal sedirnental sequence strata, in general, is youger than the lower strata is . Therefor, the isotopic ages of the lower strata is elder than that of supper strata During the process of rocks deconceying and transportation and resedimentation, some of K-and Ar in the K- bearing minerals are still in debris and minerals of source rocks. After such K- brearing matters sedimented, the same proportion between K and Ar as that in source rocks had been maintained.Sowe Can get K-Ar age of the upper strata is larger than that of the lower strata. In the view of isotopic geochemistry , the inverse sequence of geochemical section can be formed.
The inverse sequence of geochemical section can be used for the stratigraphical correlation and original rocks searched as well as petrofacies paleogeography recovered.
出处
《沉积学报》
CAS
CSCD
北大核心
1989年第2期111-116,共6页
Acta Sedimentologica Sinica
