Carbon-oxygen isotope of Dengying formation and its environmental significance in Xichuan,Southwest Henan province
ZHENG Deshun
LIU Sicong
XU Jianghong
SUN Fengbo
QIAO Yu
WANG Shiwei
Abstract：In order to discuss the depositional setting of the Sinian Dengying formation in Xichuan area,South-west Henan province,the lithological characteristics and carbonate-oxygen isotope of fifteen dolomite samples from the Dengying formation are analysed. The results show that the Dengying formation is dominated by dolo-mite and it can be subdivided into three sedimentary facies:subtidal slope,supratidal flat and intertidal zones. The average values of δ13 C and δ18 O of the Dengying formation in Xichuan area are between 1. 55‰ and-6. 85‰ respectively,which is lower than that of the southern Yangtze block. The dolomites from the Dengy-ing formation in Xichuan area are mainly burial genesis with hydrothermal activity. It is concluded that the Dengying formation in Xichuan area was deposited in a high-salinity and arid marine environment.
Keywords：Xichuan areaDengying formationcarbon-oxygen isotopicpalaeoenvironment
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 40-48 )