地质学报2017，Vol.91Issue(10)：2299-2308,10.
青海察尔汗盐湖碳酸盐的硼同位素地球化学特征
Boron Isotope Geochemistry Characteristics of Carbonate in Qarhan Salt Lake, Qinghai Province
摘要
Abstract
Boron isotopic composition (δ11 B) of evaporite in salt lake is indicative of palaeo-salinity change of brine,but there is little study about boron isotopic compositions of carbonate deposition in salt lake system.In this study,we collected authigenic carbonate samples from ISL1A drilling core for analysis of boron content and boron isotopic composition.Results show that the boron content and isotopic composition of the samples vary from 10.88× 10-6 ～265.66 ×10-6 and-1.28‰～+9.94‰ respectively,and they present a positive correlation.Analysis also reveals that the B isotope composition of brine increases with increasing of brine salinity of salt lake,which results in increasing of boron isotope composition of salt sediment.In the natural salt lake,inadequate sedimentary differentiation may result in carbonate deposition during evaporite precipitation,which possibly ran through all the stages of evolution of salt lake.Therefore,B isotopic composition of carbonate can be used to analyze salinity change of brine.Variation of boron isotope composition in carbonate from the ISL1A drilling core reflects ancient salinity changes and climate fluctuations in Qarhan salt lake since 41.8 ka.关键词
碳酸盐/硼同位素/盐度变化/气候变化/察尔汗盐湖Key words
Carbonate/boron isotope/salinity change/climate change/Qarhan salt lake引用本文复制引用
张湘如,樊启顺,魏海成,袁秦,秦占杰,李建森,王明祥..青海察尔汗盐湖碳酸盐的硼同位素地球化学特征[J].地质学报,2017,91(10):2299-2308,10.基金项目
本文为国家自然科学基金面上项目(41272274)、青海省科技项目(2016-ZJ-715)和中科院“西部之光”项目资助的成果. （41272274）
