关中盆地新生界地层划分对比与第四纪下限Cenozoic stratigraphic correlation and the lower limit of Quaternary in Guanzhong Basin
宋友桂,兰敏文,刘慧芳,张茂省,付晓芬,宁强强
摘要(Abstract):
关中盆地巨厚的新生代沉积为研究区域构造、沉积环境演变与古气候变化研究提供了良好的地质记录,但目前对新生界地层划分和第四纪下限问题仍存在争论。基于钻孔和剖面资料,结合古地磁和生物地层,对关中盆地新生界地层进行了梳理和修订,就第四纪下限和新生界地层划分与对比问题进行了探讨。岩性地层、磁性地层、生物地层证据以及气候变化特征等都支持将第四纪下限定在传统三门组的黄三门与绿三门的交界处或风成黄土与红黏土的界线之处,即松山负极性向高斯正极性转换处(M/G),古地磁年龄为2.6 Ma。基于关中盆地钻孔和剖面的古地磁数据及前人资料,划分了新生界地层,重新厘定了各沉积地层的沉积年代,将新近纪和第四纪沉积分为风成相和河湖相两套同期异相沉积地层序列,风成红黏土的年代延伸到中中新世,建议将中新世的风成堆积命名为段家坡组。这对关中盆地沉积环境形成演化与古气候变化研究、盆地资源开发以及地质工程建设具有重要意义。
关键词(KeyWords): 关中盆地;新生代;地层划分与对比;第四纪下限;黄土-红黏土风成沉积;河湖相
基金项目(Foundation): 中国地质调查局项目(DD20189270;DD20190294)
作者(Author): 宋友桂,兰敏文,刘慧芳,张茂省,付晓芬,宁强强
DOI: 10.19509/j.cnki.dzkq.2021.0204
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