摘要
贵州关岭永宁镇下三叠统上部永宁镇组碳同位素化学地层及其对比研究表明早三叠世晚期特提斯洋曾发生了稳定碳同位素组成(δ13C)的强烈波动,且这一δ13C波动具有分布广泛和不受沉积相控制的特点。笔者分析和讨论了永宁镇组碳同位素化学地层与岩石地层、生物地层、层序地层和微量元素地球化学特征的关系,指出特提斯地区下三叠统上部地层碳同位素组成受全球海平面变化、洋流循环模式和生物复苏等多因素的共同影响,早三叠世晚期δ13C的强烈正异常是洋流循环模式改变引起大洋氧化和与此相关的生物复苏的结果。
High-resolution carbon isotope measurements of＂ the upper Lower Triassic Yongningzhen Formation in Yongningzhen section of Guanling in Guizhou Province in correlation with contemporaneous strata in the world demonstrate that there is a pronounced carbon isotopic excursion characterized by wide distribution and unrestricted by sedimentary environment in the late Early Triassic of Tethys. The relationships of carbon chemo- stratigraphy to lithostratigraphy, biostratigraphy, sequence stratigraphy and trace element geochemistry of the Yongningzhen Formation are discussed in this paper. It is suggested that the δ13C variability of Tethys Ocean in the late Early Triassic was affected by global sea level change, oceanic circulation and biotic recovery as well as some other factors, and that a considerable δ13C positive excursion resulted from a extensive ocean oxidation caused by significant modification of oceanic circulation and biotic recovery related to the ocean oxidation event at that time.
出处
《中国地质》
CAS
CSCD
北大核心
2013年第5期1466-1473,共8页
Geology in China
基金
中国地质调查局"关岭生物群特征及环境演化"项目(1212010611603)资助
关键词
碳同位素化学地层
大洋氧化事件
永宁镇组
早三叠世
贵州
carbon isotope chemostratigraphy
ocean oxidation
Yongningzhen Formation
Early Triassic
Guizhou
