Carbon and Oxygen Isotopic Characteristics of Several Paleoproterozoic Carbonate Strata in North China Craton
详细信息
- 责任者：Song Huixia (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Yang Chonghui
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2011
- 卷期：30(5)
- 关键词：古元古代 ; Paleoproterozoic Era ; 碳酸盐岩 ; carbonate rocks ; 华北地区 ; North China
- 页码：p.865-872
- 图表：6 illus., 3 tables, 48 refs.
- 分类号：0803
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
摘要
Carbon and oxygen isotopes of carbonate strata in Liaohe Group,Zhongtiao Group and Wanzi Group were studied in this paper.The δ13CPDB values of banded marble in Wangjiagou Formation of Liaohe Group vary from-1.02‰ to 3.14‰,mostly in the range of 0.16‰~1.79‰.The average δ13CPDB is 1.07‰,which is higher than the average δ13CPDB of marine carbonate.The δ18OPDB values of Wangjiagou banded marble vary from-17.2‰ to-10.1‰,mostly in the range of-13.4‰~-10.1‰.The average δ18OPDB is-11.9‰.The δ13CPDB values of Yujiashan marble in Zhongtiao Group vary from-0.2‰ to 0.8‰,mostly in the range of 0~0.3‰.The average δ13CPDB of fourteen samples along one section is 0.34‰,slightly lower than the average δ13CPDB of marine carbonate.The average δ13CPDB of the next sixteen samples along another section is 0.54‰,basically consistent with the average δ13CPDB of marine carbonate.The δ18OPDB values of Yujiashan marble vary from-7.9‰ to-6.1‰.The average δ18OPDB of the first fourteen samples and the second sixteen samples are-6.80‰ and-6.88‰ respectively,with no obvious difference.The δ13CPDB values of Songjiakou marble in Wanzi Group vary from 1.0‰ to 3.8‰,2.65‰ on average,which is higher than the average δ13CPDB of marine carbonate evidently.The δ18OPDB values of Songjiakou marble vary from-8.8‰ to-5.7‰,-6.97‰ on average.The results show that all the studied marbles were formed in a comparatively stable but fluctuating environment.There existed seasonal variations of sea level and climate but no sudden drastic event during the marble sedimentary period.As to the Jatulian event,marbles in Songjiakou Formation showed response but marbles in Yujiashan formation had no response to it.The effect on Wangjiagou Formation is uncertain.This study has also proved that the Jatulian event was a global event that had extensive influence in space but could serve as an eruptive event in time scale.