江南造山带九岭南缘宜丰岩组中的寒武纪早期地层——疑源类化石研究新资料  

EARLY CAMBRIAN SEDIMENTS IN THE ‘YIFENG FORMATION’ ON THE SOUTHERN EDGE OF THE JIULING AREA IN THE JIANGNAN OROGEN——EVIDENCE FROM THE ORGANIC-WALLED MICROFOSSILS

作　　者：周效华[1] 尹磊明[2] 钱迈平[1] 陈荣[1] 张炜[1] 李春海[1] 高天山[1] 朱应新 ZHOU Xiao-hua;YIN Lei-ming;QIAN Mai-ping;CHEN Rong;ZHANG Wei;LI Chun-hai;GAO Tian-shan;ZHU Ying-xin(Nanjing Center,China Geological Survey,Nanjing 210016;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2020年第2期200-206,共7页Journal of Stratigraphy

基　　金：钦杭成矿带德兴—歙县地区地质矿产调查项目(DD20160038);长江三角洲沪宁杭地区区域地质调查项目(DD20190043)共同资助。

摘　　要：江南造山带是华南地块的重要组成部分,其地质构造演化具有重要的科学价值。赣西北九岭南缘宜丰岩组是江南造山带的一个重要地层单元,本次1∶5万区调工作中,我们通过系统的野外地质剖面实测和采样分析工作,在万载—宜丰一带宜丰岩组中发现多种疑源类化石。多个样品中发现国内外寒武纪早期常见疑源类(如Lophosphaeridium、Granomarginata、Skiagia、Dictyotidium、Asteridium和Cymatiosphaera等)。江西九岭宜丰岩组新发现的有机壁微体化石充分表明:至少部分宜丰岩组地层时代应为寒武纪早期。此为扬子地块与华夏地块可能是在加里东期才真正发生碰撞、拼贴的认识,提供了新的、有意义的微体古生物化石证据。The Jiangnan Orogen is an important part of South China Block.The‘Yifeng Formation’is an important stratigraphic unit in Jiangnan Orogen.In this 1∶50000 regional geological survey,a variety of organic-walled microfossils have been found in the Yifeng Formation in Wanzai-Yifeng area,Jiangxi Province.Many of the samples contain acritarch forms known previously from early Cambrian in China and abroad,such as Lophosphaeridium,Granomarginata,Skiagia,Dictyotidium,Asteridium,Cymatiosphaera,etc.The newly discovered organic-walled microfossils from the‘Yifeng Formation’in Jiangxi Province indicate that at least part of the‘Yifeng Formation’belongs to early Cambrian strata.This provides new and significant stratigraphic evidence for the recognition that the collision between the Yangtze Craton and Cathaysia Block may have occurred during the Caledonian period.

关 键 词：宜丰岩组 疑源类化石 江南造山带 寒武纪早期 

分 类 号：P534.41[天文地球—古生物学与地层学]