地质学报2017，Vol.91Issue(5)：1097-1107,11.
渝东北地区观音桥段沉积与有机碳同位素特征及其区域对比
Sedimentary and Organic Carbon Isotopic Characteristics of the Kuanyinchiao Member in Northeastern Chongqing and Its Regional Correlation
摘要
Abstract
The thickness and sedimentary features of the Kuanyinchiao Member of Wufeng Formation and Longmaxi Formation in northeastern Chongqing vary greatly.Analysis of five profiles,Well YC1,Tianba profile (TBP),Bailu profile (BLP),Sifangdong profile (SFD) and Lianghekou profile (LHP) from west to east,shows that the Kuanyinchiao Member is dominated by grayish medium-thin bedded argillaceous limestone,locally containing shelly fauna (the Hirnantia fauna).It is common that argillaceous limestone is intensively weathered into brownish-yellow.The Kuanyinchiao Member is characterized by grayish-black argillaceous limestone and hosting shelly fauna in LHP,and increasing content of silty or sandy grains apparently in SFP.The characteristics of organic carbon isotopic distribution in these profiles show many resemblances,and can be correlated regionally and even globally.The Kuanyinchiao Member of Hirnantian Stage shows positive δ13 Corg excursion with a roughly similar amplitude and peak value probably due to local environment perturbation.The δ13 Corg value increases pulsatively from the Wufeng Formation to Kuanyinchiao Member,with a few peaks.On the contrary,δ13 Corg shows continuous,steady fall from Guangyinqiao Member to the Longmaxi Formation,with drop rate depending on the thickness of the Longmaxi Formation.关键词
观音桥段/五峰组—龙马溪组/有机碳同位素/地层对比/渝东北Key words
Kuanyinchiao Member/Wufeng Formation-Longmaxi Formation/organic carbon isotope/stratigraphic correlation/northeastern Chongqing引用本文复制引用
周业鑫,丁俊,余谦,王剑,门玉澎,熊国庆,熊小辉,邓奇..渝东北地区观音桥段沉积与有机碳同位素特征及其区域对比[J].地质学报,2017,91(5):1097-1107,11.基金项目
本文为四川盆地页岩气基础地质调查项目(DD20160176)、重庆市页岩气专项地质调查(渝东北)项目、重庆市页岩气勘探有利区带优选及资源量评价研究(渝东北)项目、国家自然科学基金项目(编号41672112、41402103)共同资助成果. （DD20160176）
