贵州拉也剖面下Kellwasser事件生物地层及化学地层特征研究  

Biostratigraphy and Chemostratigraphy Across the Lower Kellwasser Boundary in Laye Section, Guizhou Province

作　　者：常洁琼 白志强 李玉坤 郭建祥 彭永波 沈冰 CHANG Jieqiong;BAI Zhiqiang;LI Yukun;GUO Jianxiang;PENG Yongbo;SHEN Bing(The Key Laboratory of Orogenic Belts and Crustal Evolution（MOE）,School of Earth and Space Sciences,Peking University,Beijing 100871;Guangxi Geological Survey,Naning 530023;Geology Team No.4 of Guangxi,Naning 530033;Department of Geology and Geophysics,Louisiana State University,Baton Rouge,LA 70803)

机构地区：[1]造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 [2]广西壮族自治区地质调查院,南宁530023 [3]广西壮族自治区第四地质队,南宁530033 [4]Department of Geology and Geophysics,Louisiana State University,Baton Rouge,LA 70803

出　　处：《北京大学学报（自然科学版）》2018年第4期752-762,共11页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(41172031)资助

摘　　要：为研究下Kellwasser事件的生物地层及化学地层特征,对贵州拉也剖面进行细致的牙形石生物地层学和高分辨率化学地层学研究。结果表明,剖面底部无机碳同位素及有机碳同位素有显著正向偏移,样品LY-8代表的层位为下Kellwasser事件的界线。Kellwasser事件碳同位素变化的主要原因是有机碳埋藏量的增加,可能是由初级生产力增加和缺氧环境共同造成的。In order to study biostratigraphy and chemical stratigraphy during the Lower Kellwasser event, high resolution conodonts research and chemostratigraphic framework were carried out. The data reveals that the inorganic and organic carbon isotope have a significant positive excursion at the bottom of the Laye section. It is considered that the sample LY-8 is consistent with the Lower Kellwasser boundary. The main reason for the change of carbon isotope in this area is the increase of organic carbon burial, which is caused by the increase of marine primary productivity and anoxia environment possibly.

关 键 词：下Kellwasser界线 牙形石 碳同位素 有机碳埋藏 初级生产力 

分 类 号：P52[天文地球—古生物学与地层学]