华南地质2025，Vol.41Issue(4)：726-733,8.DOI:10.3969/j.issn.2097-0013.2025.04.004
川东寒武系洗象池群洗三段蒸发岩锶、硫同位素特征及物质来源
Strontium and Sulfur Iisotopic Characteristics and Material Sources of Evaporites in the Third Member of the Cambrian Xixiangchi Group,Eastern Sichuan Basin
摘要
Abstract
The Cambrian Xixiangchi Group in the eastern Sichuan Basin is characterized by a thick layer of gypsum deposits,making it a key target for oil and gas exploration.Although previous studies have extensively investigated this stratum,little attention has been paid to the evaporites and their sources.In this study,based on the drill core data from the eastern Sichuan Basin in recent years,we conducted detailed strontium and sulfur isotopic analyses on anhydrite-bearing dolomite from the third member of the Cambrian Xixiangchi Group.The results show that the 87Sr/86Sr ratios of anhydrite range from 0.708 995 to 0.709 316,and the δ34S values vary between 32.17‰ and 38.10‰.These values generally fall within the ranges of contemporary global normal seawater,indicating that the evaporites in the third member of the Cambrian Xixiangchi Group were primarily derived from seawater,with no significant contribution from external sources.Furthermore,during the deposition of the Xixiangchi Group,the Eastern Sichuan region was far from the Leshan-Longnvsi Palaeo-uplift in central Sichuan.Therefore,the terrestrial debris input controlled by this paleo-uplift did not substantially influence sedimentation in the study area.关键词
蒸发岩/锶同位素/硫同位素/物质来源/洗象池群/川东地区Key words
evaporites/strontium isotope/sulfur isotope/material source/Xixiangchi Group/eastern Sichuan Basin分类
天文与地球科学引用本文复制引用
刘新民,陈兰朴,刘皓天,刘漪,高岸华..川东寒武系洗象池群洗三段蒸发岩锶、硫同位素特征及物质来源[J].华南地质,2025,41(4):726-733,8.基金项目
中国石油化工股份有限公司科研项目(P22077)、中国石油化工股份有限公司江汉油田分公司科研项目(JKDBF0225005) （P22077）
