doi:10.16186/j.cnki.1673-9787.2020.1.5

Received:2019/05/20

Revised:2019/07/28

Published:2020/01/15

Carbon isotope composition characteristics and its stratigraphic significance inZhangxia formation， Miaoliangian series of Cambrian in Dengfeng， western Henan

ZHONG Congcong, WANG Min, LI Kainan, FAN Yuchao, PENG Shenyuan

Institute of Resources and Environment， Henan Polytechnic University ，Jiaozuo 454000 ， Henan， China

Abstract:The deposition of Miaoliangian series of Cambrian in Dengfeng in western Henan is dominated by carbonate strata， which provides good materials for the study of carbon isotope strata. The high-resolution carbon isotope curve in Dengfeng area was presented in this study， and a negative excursion of -1.5% in the third and fourth sections of Zhangxia formation was found， which was between the negative isotope carbon excursion （DICE） at the bottom of the Drumian stage of Miaoliangian series and positive isotope carbon excursion （SPICE） at the bottom of the Furongian series. Through the study of carbon isotope in the strata of south China ， the United States ， Australia， and Siberia， it was found that this negative excursion was widespread ， and the interface between the Guzhangian stage and Drumian stage is near the minimum of the negative drift of the segment. Therefore， it was inferred that the interface between the Guzhangian stage and Drumian stage corresponded to the thick oolitic limestone in the upper part of the Zhangxia formation.

Key words:carbon isotope;Zhangxia formation;Cambrian;western Henan

豫西登封地区寒武系苗岭统张夏组碳同位素组成特征及其地层学意义_仲聪聪.pdf