山西榆社地区新近纪地层时代讨论

朱大岗; 孟宪刚; 邵兆刚; 雷伟志; 王津; 韩建恩; 余佳; 吕荣平; 王艳

山西榆社地区新近纪地层时代讨论

A discussion on the age of the Neogene strata in Yushe area, Shanxi Province

摘要

摘要: 提要：通过对山西榆社地区新近纪地层的野外地质调查和实测剖面，对分布于该区的新近纪地层进行了详细的研究和划分，提供了新的ESR测年数据，并结合古地磁年龄、生物地层序列确定了该区新近纪地层顺序为：新近系上新统上部麻则沟组（N22m）、新近系上新统下部高庄组（N12g）和中新统马会组（N1m）。根据实测剖面，可将这3个组的河湖相地层划分为37层，总厚度达446.5 m。ESR测年结果表明，麻则沟组的形成时间为2.50～3.04 Ma，属新近纪上新世晚期；高庄组形成时间为3.25～5.25 Ma，属新近纪上新世早期；马会组形成时间为5.30～13.10 Ma，属新近纪中新世晚期。

Abstract: Abstract：Based on geological survey and measured profiles, the authors carried out a detailed study and classification of the Neogene strata distributed in the Yushe area of Shanxi Province. ESR dating combined with biostratigraphic and Paleomagnetic dating of the Neogene strata in the study area revealed the stratigraphic sequence as follows (in descending order): Upper Pliocene Mazegou Formation, Lower Pliocene Gaozhuang Formation and Miocene Mahui Formation. Based on the measured section, the authors divided the fluvio-lacustrine facies sediments of the three formations into 37 layers, with the total thickness being 446.5m. It is obvious from the ESR dating that the Mazegou Formation (2.50～3.04Ma), the Gaozhuang Formation (3.25～5.25Ma) and the Mahui Formation (5.30～13.10Ma) should belong respectively to Late Pliocene, Early Pliocene and Late Miocene.

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