安徽淮北地区寒武系“崮山阶”—凤山阶新知  

NEW KNOWLEDGE ON THE CAMBRIAN “KUSHANIAN"-FENGSHANIAN STAGES OF THE HUAIBEI REGION,ANHUI PROVINCE

作　　者：纵瑞文[1] 刘琦[1] 龚一鸣[1] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,中国地质大学(武汉)地球科学学院,湖北武汉430074

出　　处：《地层学杂志》2012年第3期653-661,共9页Journal of Stratigraphy

基　　金：国家自然科学基金项目(No.40872001;41072252;40921062);国家地质学理科基地人才培养基金(J0830520)联合资助

摘　　要：根据三叶虫Acanthometopus obesus、Trianguraspis nodus、Petalocephalus laevis、Taishaniasp.等的发现,将淮北地区捻山剖面原属凤山阶的地层划归长山阶,以Acanthometopus带作为该区长山阶最顶部的三叶虫带,淮北地区凤山阶与长山阶的界线应在Ptychaspis-Tsinania带与Acanthometopus带之间;通过与标准剖面及邻近地区的对比,淮北地区的崮山组应予解体,原崮山组上部与炒米店组岩性一致,应划入炒米店组,其下部岩性与张夏组一致,应划入张夏组,淮北地区无崮山组。淮北地区的炒米店组跨越了整个长山阶和凤山阶中下部,据岩性差异可分为上、下两段;炒米店组在华北地区具有明显的穿时性,其底界从长山阶底界跨至凤山阶顶界。Based on the occurrences of the trilobites Acanthometopus obesus, Trianguraspis nodus, Petalocephalus laevis, and Taishania sp. , the Acanthometopus Zone has been recognized from the Nianshan section, Huaibei region, Anhui Province, we suggests that this particular horizon should be allocated to the Cambrian Changshanian Stage rather than the Fengshanian Stage. We propose to make the Acanthometopus Zone as the topmost trilobite zone of the Changshanian Stage, and the boundary between the Changshanian-Fengshanian stages should be placed between the Acanthometopus Zone and the overlying Ptychaspis-Tsinania Zone. Correlation with the stratotype section in Shandong and neighboring regions indicates that the lower part of the Kushan Formation of Huaibei region should be put in the Changhia Formation, the upper part be included in the Chaumitien Formation in the Huaibei region, and thus the Kushan Formation is not present in the in Huaibei region. The revised Chaumitien Formation in the Huaibei region represents the entire Changshanian Stage and the middle-lower part of the Fengshanian Stage and can be subdivided into two members. The Chaumitien Formation is evidently diachronous with its base ranging from the Changshanian to the top of the Fengshanian.

关 键 词：岩石地层 地层界线 化石带 炒米店组 “崮山阶” 长山阶 凤山阶 寒武系.淮北地区 安徽 

分 类 号：P534.41[天文地球—古生物学与地层学]