四川隆康、塔藏含火山岩地层时代新证据

详细信息

刊出日期: 1995-02-15

NEW EVIDENCE FOR THE AGE OF THE VOLCANICS-BEARING STRATA IN LONGKANG AND TAZANG,SICHUAN

Publish Date: 15 February 1995

摘要: 在四川南坪县隆康和塔藏一带主要发育一些碳酸盐岩、砂岩、页岩及海相火山岩。１：２０万漳腊幅区调报告２将含火山岩地层的时代划归于早二叠世和中三叠世。通过在该区系统测制剖面，在原视为中－晚三叠世的含基性火山岩的地层中作者获得了以Ｐａｌｍａｔｏｌｅｐｉｓｇｒａｃｉｌｉｓｓｉｇｍｏｉｄａｌｉｓ，Ｐ．ｍａｒｇｉｎｉｊｅｒａ为代表的一些晚泥盆世法门期牙形石，因为该区海相火山岩与含晚泥盆世牙形石的碳酸盐岩呈互层关系，海相火山岩的时代应改属晚泥盆世。

Abstract: There are mainly deveolped carbonate rocks,sandstone,shale and marine volcanic rocksin the Longkang and Tazang area,Nanping County,Sichuan Province. In the report on re-gional surveys of the 1:200000 Zhangal Sheet,the age of the strata bearing volcanic rocks isassigned to Early Permian and Middle Triassic. Through a systematic measurement of sec-tions in the area,the authors obtained some Famznenian（Late Devonian）conodonts repre-sented by Palmatolepis gracilis sigmoidalis and P. marginifera in the vasic volcancs-bearingsrata that were originally considered to be Middle-Late Triassic in age. As the marine vol-canic rocks alternate with carbonate rocks yielding Late Devonian conodonts iii the area,theage of marine volcanic rocks should be Late Devonian.