鄂西北竹溪地区志留系竹溪组  

THE SILURIAN ZHUXI FORMATION IN THE ZHUXI AREA, NORTHWESTERN HUBEI PROVINCE

作　　者：吴荣昌[1,2] 黄冰 王光旭[2] 魏鑫[2,3] 詹仁斌 唐鹏 栾晓聪 张雨晨 WU Rong-chang;HUANG Bing;WANG Guang-xu;WEI Xin;ZHAN Ren-bin;TANG Peng;LUAN Xiao-cong;ZHANG Yu-chen(CAS Key Laboratory of Economic Stratigraphy and Palaeogeography,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,39 East Beo＇ing Road,Nanjing 210008;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院资源地层学与古地理学重点实验室中国科学院生物演化与环境卓越创新中心中国科学院南京地质古生物研究所,江苏南京210008 [2]现代古生物学和地层学国家重点实验室中国科学院生物演化与环境卓越创新中心中国科学院南京地质古生物研究所,江苏南京210008 [3]中国科学院大学,北京100049

出　　处：《地层学杂志》2018年第3期243-256,共14页Journal of Stratigraphy

基　　金：国家自然科学基金委(No.41672008;41472006;41521061)资助

摘　　要：志留系竹溪组主要由黄绿色、浅灰色泥岩、泥质板岩组成,夹有生屑灰岩及礁灰岩,主要分布在湖北竹溪、陕西平利一带。自建立以来,其地质时代一直存在争议。在竹溪县城北新胜剖面竹溪组采集了腕足类、三叶虫、珊瑚以及牙形类等化石,各类化石组合均显示竹溪组中下部地层的地质时代为志留纪兰多维列世特列奇中、晚期。同时开展了稳定碳同位素地层学研究,在竹溪组顶部礁灰岩段可见一个较为显著的碳同位素漂移事件,漂移幅度达+4.5‰,碳同位素峰值可达6‰。然而,因顶部灰岩缺乏有效的化石证据,其精确时代及其全球对比意义尚待今后开展进一步的研究工作。The Zhuxi Formation is characterized by greenish, grayish mudstone, and muddy slate, with subordinate bioclastic, reefal limestone. It is mainly distributed in the Zhuxi County of Hubei Province and Pingli County of Shaanxi Province. Since its establishment, there is a long debate on its age. We made new collections of brachiopods, trilobites, corals, conodonts, as well as carbon isotope samples from the Zhuxi Formation in the Xinsheng section, Zhuxi County, Hubei Province. The results from brachiopods, trilobites, corals, and conodonts indicate that the age of the lower and middle Zhuxi Formation falls in the middle and late Telychian. Moreover, carbon isotope data have been documented from the Zhuxi Formation, showing a conspicuous positive excursion in the upper Zhuxi Formation with its lithology dominated by the bioclastic, reefal limestone. However, the age of the upper Zhuxi Formation is still a matter of debate due to lack of biostratigraphically useful fossil.

关 键 词：生物地层 化学地层 碳同位素记录 腕足类 三叶虫 牙形类 竹溪组 志留系 竹溪 湖北 

分 类 号：P534.43[天文地球—古生物学与地层学] P539.7[天文地球—地质学]