贵州乌当下奥陶统稳定碳同位素地层研究  

CARBON ISOTOPE CHEMOSTRATIGRAPHY OF THE LOWER ORDOVICIAN IN WUDANG,GUIZHOU,SOUTH CHINA

作　　者：池祥日 杨宇宁[1] 闫冠州 阳磊 刘静 何敏 张倩倩 彭庭祖 马闻语 CHI Xiang Ri;YANG Yu Ning;YAN Guan Zhou;YANG Lei;LIU Jing;HE Min;ZHANG Qian Qian;PENG Ting Zu;MA Wen Yu(College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;University of Chinese Academy of Science,Beijing 100049)

机构地区：[1]贵州大学资源与环境工程学院,喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025 [2]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》2024年第3期307-317,共11页Journal of Stratigraphy

基　　金：国家自然科学基金(42162003、41890845);贵州省科技计划(黔科合平台人才2017-5788);贵州省人才基地项目(RCJD2018-21);中国科学院南京地质古研究所现代古生物学和地层学国家重点实验室开放课题(173130)共同资助。

摘　　要：本研究从贵阳乌当小谷龙剖面下奥陶统桐梓组和红花园组系统采集137件碳同位素样品,根据分析结果可识别出3次显著的碳同位素漂移事件:特马豆克阶中部Rossodus manitouensis带顶部至Colaptoconus quadraplicatus带底部的Top Skullrockian Isotopic Carbon Excursion (TSICE)、特马豆克阶上部Paltodus‘deltifer’带中部的碳同位素双峰值正漂事件Late Stairsian Isotopic Carbon Excursion (LSICE)及弗洛阶中部Serratognathus diversus带上部碳同位素漂移事件。小谷龙剖面识别的上述碳同位素漂移事件可与华南、波罗的地区、北美及阿根廷前科迪勒拉等地的同期漂移事件进行直接对比。Stable carbon isotope records(δ^(13)Ccarb)of the Lower Ordovician Tungtzu and Hunghuayuan formations(Tremadocian to Floian)at the Xiaogulong section in the Wudang area,Guizhou,South China are presented and analyzed here.The results reveal three distinct isotopic excursions of potentials for global correlation,including:(1)the Top Skullrockian Isotopic Carbon Excursion(TSICE)in the Tremadocian,(2)the Late Stairsian Isotopic Carbon Excursion(LSICE),an excursion with double peaks within the Late Tremadocian Paltodus‘deltifer’Zone,and(3)a gradualδ^(13)C rising in the middle Floian Serratognathus diversus Zone.These excursions can be correlated with the equivalent successions of the Argentine Precordillera,Utah of North America,North China,and other localities of South China.

关 键 词：碳同位素地层 下奥陶统 华南扬子区 贵州乌当 

分 类 号：P534.42[天文地球—古生物学与地层学]