闽西上杭白垩纪红层磁性地层学研究

A MAGNETOSTRATIGRAPHIC STUDY OF CRETACEOUS RED BEDS FROM SHANGHANG, WESTERN FUJIAN

闽西红层的地层划分与对比至今仍然是福建地层研究中存在较大分歧与争论的问题。根据样品逐步退磁的多成分分析,上杭红层磁性地层学研究表明,赤石群时代当为K_2(70—80百万年),沙县组时代为K_(1-2)(80—105百万年),红层的氧化晚于沉积3—5百万年。

So far, in studies of Fujian stratigraphy the stratigraphical division and correlation of red beds from Western Fujian are still a problem which is divergent on and argued about. The magnetostratigraphical Study of red beds from Shanghang, based on multicomponent analysis of stepwise demagnetization path of specimen, show that the age of Chishi Group should be assigned to K_2 (70—80Ma) and Shaxian Formation should be assigned to K_(1-2) (80—105Ma), the oxidation of red beds took place 3—5Ma later than their deposition.