2018年03期

李春晓,王世骐,郝呈禄,陈光庭,孙博阳,郑妍,许泗建.西宁盆地嵌齿象化石地点考证及地层对比[J].地层学杂志, 2018, 42(03): 313-324.

LI Chun-xiao,WANG Shi-Qi,HAO Cheng-lu,CHEN Guang-ting,SUN Bo-yang,ZHENG Yan,XU Si-jian. IN THE XINING BASIN WITH RELEVANT STRATIGRAPHIC CORRELATION [J].Journal of Stratigraphy, 2018, 42(03): 313-324.

西宁盆地嵌齿象化石地点考证及地层对比
李春晓 1 2 3 王世骐 1 2 郝呈禄 4 陈光庭 4 孙博阳 1 2 郑妍 1 许泗建 1
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+ 作者地址

1中国科学院古脊椎动物与古人类研究所, 中国科学院脊椎动物演化与人类起源重点实验室 北京 100044;

2 中国科学院生物演化与环境卓越创新中心 北京 100044;

3 中国科学院大学 北京 100049;

4青海省地质调查院 青海西宁 810012

)的种型群材料是中国最早的一批有出土地点记录的长鼻类化石。这些化石在西宁盆地新生代地层划分和对比中起到了基础性的作用,但长期以来,对二者种型群材料产出的精确地点和层位并不完全清楚。受此影响,对二者生物年代及演化阶段的研究,以及西宁盆地的地层对比存在很多争议。对西宁盆地间型嵌齿象和维曼嵌齿象种型群化石点(即正型地点)进行了多方考证,获取了化石地点的准确位置:吊沟和八盘山。通过地层对比,证明两种嵌齿象的正型地点出自同一层位--关家山组(原咸水河组下部)底部河道相的绿色砂砾岩层中,两者的时代相同。依据已有的古地磁结果,间型嵌齿象和维曼嵌齿象的正型地点的年代应为16~15 Ma。通过形态学分析进一步阐释两种嵌齿象的系统演化关系,认为二者仅仅代表不同的演化方向,而不是原始与进步的演化阶段。这一方面对中国古生物史的研究有重要意义,另一方面为探讨嵌齿象类群演化的问题提供了关键性的年代学数据,也对西宁盆地的大地构造和沉积环境演化等方面提供了重要的生物地层学证据。
语种: 中文   
基金: 国家自然科学基金项目(No: 41372001,41430102),科学技术部基础性工作专项(2015FY31010...
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