作者：郑德顺；刘思聪；徐江红；孙风波；乔雨；王世伟

第一作者单位：河南理工大学资源环境学院

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δ¹³C均值为1.55‰,δ¹⁸O均值为-6.85‰,低于扬子板块南部灯影组δ¹³C与δ¹⁸O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。

Abstract：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 δ¹³C and δ¹⁸O 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.

基金：国家自然科学基金资助项目(41272118)；河南理工大学第十二期“步步高”大学生科技攀登计划项目(SQ-2016-096)；

关键词：淅川地区;灯影组;碳、氧同位素;古环境;

DOI：10.16186/j.cnki.1673-9787.2017.06.007

分类号：P597