摘要
对许家窑泥河湾组两个平行剖面的高分辨率古地磁研究结果发现,在剖面的中下 部存在厚度约 10m(未见底)的巨厚负向极性带.根据正负极性带的相对位置及组合关系并 结合剖面附近相关层位火山豆的K-Ar绝对年龄值进行分析认为,该负向极性带应为松山反 向极性时带.此结果否认了作者关于在遗址剖面底部存在Blake反向极性偏移的结论.由此 推断,分布在许家窑一带的泥河湾组年代应为早更新世晚期至中更新世早中期.
A high-resolution paleomagnetism study was made at two parallel sections of Nihewan group at Xujiayao Paleolithic site. More than 10m reversed polarities were found at the middle-low parts of both sections. According to the K-Arages of volcanic beaus near by the sections, it is derived that the reversed polarities should be the Matuyama reversed polarity zone. The Blake reversed excursion reported previously was denied.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第2期223-231,共9页
Chinese Journal of Geophysics
基金
国家自然科学基金项目!49474218
山西自然科学基金
挪威研究理事会基金
关键词
泥河湾组
高分辨率
古地磁
磁性地层学
Nihewan group, Matuyama reversed polarity chron (zone), Brunhes normal polarity chron (zone), Blake reversed excursion.