邓涛,侯素宽,颉光普,王世骐,史勤勤,陈少坤,孙博阳,卢小康

• 1:中国科学院古脊椎动物与古人类研究所
• 2:脊椎动物进化系统学重点实验室
• 3:西北大学地质系
• 4:甘肃省博物馆

摘要(Abstract)：

中国上中新统的陆相地层非常发育,其中在华北地区广泛分布的红黏土堆积富含三趾马动物群化石。甘肃临夏盆地的上中新统即是一套红黏土地层,其岩石地层单位名称为柳树组。已发现柳树组的大量化石地点,按其在剖面中出现的层位可以自下而上分为4个动物群,已根据代表性地点依次命名为郭泥沟、大深沟、杨家山和青卜山动物群。古地磁测年数据显示,柳树组涵盖了整个晚中新世的沉积,即包括上中新统下部的灞河阶和上中新统上部的保德阶。郭泥沟、大深沟和杨家山动物群属于灞河阶,青卜山动物群属于保德阶。灞河阶底界如与海相Tortonian阶一致,则这条界线(古地磁C5r.2n下界)存在于临夏盆地沉积序列中,年龄为11.6Ma,三趾马的首现位置略高于此界线,年龄为11.1Ma。保德阶底界如与海相Messinian阶一致,可以在柳树组和西藏吉隆的沃马组中准确划定这条界线的位置。由于山西保德是保德阶的命名地点,因此保德阶的底界层型应选择在保德县腰庄乡冀家沟剖面保德组靠近红黏土底部的古地磁C3Br.1r之内,年龄为7.25Ma,三趾马Hipparion forstenae的首现可作为其生物标志。

关键词(KeyWords)： 年代地层;陆相沉积;界线层型;灞河阶;保德阶;中新统;临夏盆地;甘肃

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(No.40730210);; 国家重点基础研究发展计划项目(2012CB821906);; 全国地层委员会中国新近系地层建阶研究项目资助

作者(Author): 邓涛,侯素宽,颉光普,王世骐,史勤勤,陈少坤,孙博阳,卢小康

DOI: 10.19839/j.cnki.dcxzz.2013.04.004

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