北非摩洛哥小阿特拉斯东段晚泥盆世法门期叠层石的发现  

Discovery of the Late Devonian Famennian Stromatolites in the Eastern Anti-Atlas,Morocco,North Africa

作　　者：曾雄伟 何垚砚 王成刚 吴发富 危凯 王志宏 ZENG Xiong-Wei;HE Yao-Yan;WANG Cheng-Gang;WU Fa-Fu;WEI Kai;WANG Zhi-Hong(Hubei Key Laboratory of Paleontology and Geological Environment Evolution,Wuhan 430205,Hubei,China;Wuhan Center,China Geological Survey(Geosciences Innovation Center of Central South China),Wuhan 430205,Hubei,China)

机构地区：[1]古生物与地质环境演化湖北省重点实验室,湖北武汉430205 [2]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205

出　　处：《华南地质》2024年第1期56-62,共7页South China Geology

基　　金：商务部对外援助项目([2021]28)。

摘　　要：北非摩洛哥小阿特拉斯东段Fecht地区的晚泥盆世地层划分为ds3和dh两个单元。ds3单元是一套厚约1.3m的灰色夹紫红色厚-薄层瘤状生屑灰岩,发育叠层石,产丰富的海百合茎和头足类,局部伴生腕足和三叶虫。dh单元下部为灰色薄层泥质粉砂岩与粉砂质页岩互层,夹泥灰岩透镜体;上部为灰绿色中层细砂岩,发育波痕构造,产遗迹化石和双壳类。牙形石生物地层表明这两个单元都处于法门期早Palmatolepis marginifera带。本文首次报道了摩洛哥晚泥盆世法门期的叠层石,说明弗拉期-法门期生物灭绝事件发生后,微生物首先出现繁盛,随后才开始骨骼生物的复苏。The Late Devonian strata at Fecht area in the eastern Anti-Atlas,Morocco,North Africa,could be divided into two units:ds3 and dh.The ds3 unit is a set of gray with purple-red thick to thin layered nodular detrital limestone with a thickness of about 1.3m,where stromatolites are observed,rich in crinoid stems and cephalopods,and locally associated with brachiopods and trilobites.The lower part of the dh unit is an interbedded layer of gray thin layer of argillaceous siltstone and silty shale,mixed with muddy limestone lenses;the upper part is a gray-green medium layer of fine sandstone,with ripple structures and abundant trace fossils and bivalves.The conodont biostratigraphy indicates that both units should be located in the Early Palma⁃tolepis marginifera zone of the Famennian.This article reports on the stromatolites of the Late Devonian Famennian in Morocco for the first time,indicating that after the Frasnian-Famennian mass extinction,microorganisms flourished first and then followed by the recovery of skeletal organisms.

关 键 词：叠层石 牙形石 法门期 晚泥盆世 小阿特拉斯东段 北非摩洛哥 

分 类 号：P52[天文地球—古生物学与地层学]