沉积与特提斯地质2019，Vol.39Issue(4)：65-70,6.
柴达木盆地西部古近系石膏及其硫同位素分布特征
Distrbution of gypsum and sulfur isotopes in the Palaeogene strata, western Qaidam Basin, Qinghai
摘要
Abstract
The gypsoliths occur as part of the cap rocks of the oil and gas traps in the Qaidam Basin，Qinghai. In the light of the statistics of gypsum contents and ;34sv-CDT values，the gypsum in the Palaeogene strata mainly occurs in the Shizigou depression and Xiaoliangshan depression near the Altun Mountains.Vertically，the gypsum contents display the cyclic distribution. The 34Sv-CDT values show a rarely wide range of -23.3% to 71.4%.The initial 34S values are very low in the Altun Mountains. The increase of the reducing conditions and the fractionation of bacteria towards the Qaidam Basin leads to the great differences in the 34Sv-CDT values.The main controlling factors include the initial3athe initial 34Sv-CDT values，supply rates of sulfates，and intensity of bacteria fractionation. It follows that the sulfates are derived from the Altun Mountains，and then enter into the Qaidam Basin through the Shizigou depression. The results of research in this study may be helpful to the study of the gypsum distribution，sedimentary environments of the Palaeogene salt lakes，and sulfate origins in the study area.关键词
柴达木盆地/石膏/硫同位素/古近系Key words
Qaidam Basin/gypsum/sulfur isotope/Palaeogene分类
天文与地球科学引用本文复制引用
郑希民1,杨柳1,2,易定红1,王朴1..柴达木盆地西部古近系石膏及其硫同位素分布特征[J].沉积与特提斯地质,2019,39(4):65-70,6.基金项目
中国石油天然气股份有限公司重大科技专项"柴达木盆地建设高原大油气田勘探开发关键技术研究与应用"(编号:2016E-01)和国家科技专项"柴达木复杂构造区油气成藏、关键勘探技术与新领域目标优选"(编号:2016ZX05003-006)联合资助 （编号:2016E-01）
