渝东南綦江地区上奥陶统宝塔组碳同位素地层研究及其地质意义
首发时间:2020-03-23
摘要:上奥陶统宝塔组广泛分布于扬子地区,地层连续,研究程度高,是地层学研究的理想对象。对渝东南綦江地区上奥陶统宝塔组开展了详细的稳定碳同位素地层学研究,观音桥剖面发现了宝塔组中下部的碳同位素正向偏移现象,基于前人牙形类生物地层学研究及碳同位素区域对比分析,证实该碳同位素漂移是GICE(Guttenberg Isotope Carbon excursion)事件,GICE事件不仅能成为地层划分对比的良好标志,而且还提供了宝塔组网纹构造成因研究的新证据。。
关键词: 上奥陶统 宝塔组 碳同位素地层 GICE 渝东南地区
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Carbon isotope Chemostratigraphy of the Upper Ordovician Pagota Formation in the Qijiang area, southeastern Chongqing,and its geological significance
Abstract:The Upper Ordovician Pagoda Formation is widely distributed in the Yangtze area, with continuous stratigraphic and high degree of research. It is an ideal object for stratigraphic research. A detailed study of stable carbon isotope stratigraphy was carried out on the Upper Ordovician Pagoda Formation in the Qijiang area of southeastern Chongqing. The Guanyinqiao section discovered the forward shift of carbon isotope in the middle and lower parts of the Pagoda Formation, based on the previous human toothed biostratigraphy. And the carbon isotope region comparison analysis confirmed that the carbon isotope drift is a GICE (Guttenberg Isotope Carbon excursion) event. The GICE event can not only become a good indicator of stratigraphic division and contrast, but also can provide new evidence for the study of the formation of the pagoda network.
Keywords: Upper Ordovician Pagoda Formation carbon isotope stratum GICE southeastern Chongqing.
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