王怿,戎嘉余,徐洪河,王成源,王根贤

• 1:现代古生物学和地层学国家重点实验室
• 2:中国科学院南京地质古生物研究所
• 3:湖南省地质研究所

摘要(Abstract)：

就华南板块而言,志留纪晚期(Ludlow世—Pridoli世)近岸浅海、非笔石相地层多分布在边缘海湾处,是否在扬子地台内部发育,以往尚无确凿记载。依据来自湘西北张家界—桑植地区新近发现的微体化石(主要指植物碎片),确认志留纪晚期地层在扬子地台内部确实存在。对原小溪组(又称小溪峪组)进行厘定,将它"一分为二":上部仍称小溪组,命名地在桑植瑞塔铺,发育最好的是张家界温塘剖面,岩性为黄绿色碎屑岩,富含大型虫管遗迹化石,时代为Ludlow晚期—Pridoli早期;下部称迴星哨组,归于Llandovery统Telychian阶上部。小溪组与迴星哨组之间为假整合接触,缺失Telychian末期、Wenlock世和Ludlow世早期地层。由此得出结论:在"扬子上升"后,扬子地台内部曾被志留纪晚期的海水侵漫;对其他地区迴星哨组与上覆地层的研究需要细化。

关键词(KeyWords)： 岩石地层;生物地层;小溪组;迴星哨组;Ludlow世;Pridoli世;志留系;张家界;湖南

Abstract:

Keywords:

基金项目(Foundation): 中国科学院知识创新工程项目(No.KZCX2-YW-Q05-01,KZCX2-YW-105);; 国家重点基础发展规划项目(No.2006CB806400);; 和国家自然科学基金(No.40523004)资助成果

作者(Author): 王怿,戎嘉余,徐洪河,王成源,王根贤

DOI: 10.19839/j.cnki.dcxzz.2010.02.001

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