中文摘要：

为研究豫西南淅川地区震旦系灯影组沉积环境特征,运用沉积学、沉积地球化学方法,分析了淅川灯影组岩性特征及其碳、氧同位素组成。研究表明：淅川灯影组岩性主要为白云岩,沉积相类型有潮下斜坡带、潮上云坪以及潮间带;灯影组内δ~（13）C均值为1.55‰,δ~（18）O均值为-6.85‰,低于扬子板块南部灯影组δ~（13）C与δ~（18）O值;淅川灯影组白云岩成因主要为埋藏成因,并伴随有热液活动。综合分析可知,淅川灯影组形成于盐度较高、较炎热的海相环境。

英文摘要：

In order to discuss the depositional setting of the Sinian Dengying formation in Xichuan area,Southwest 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 dolomite and it can be subdivided into three sedimentary facies：subtidal slope,supratidal flat and intertidal zones.The average values of δ~（13）C and δ~（18）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 Dengying 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.