清江盆地洋湖凹陷岩盐矿床A1孔泥岩段硼同位素组成特征研究  

Boron isotope compositions study of mudstone in drill hole A1,Yanghu Depression,Qingjiang Basin

作　　者：汤凯 王春连[2] 王九一 Tang kai;Wang Chunlian;Wang Jiuyi(Geophysics and Oil Resource Institute,Yangtze University,Wuhan,430100,China;Institute of Mineral Resources,CAGS,MNR Key Laboratory of Metallogeny and MineralAssessment,Beijing,100037,China)

机构地区：[1]长江大学地球物理与石油资源学院,武汉430100 [2]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《化工矿产地质》2019年第2期111-116,共6页Geology of Chemical Minerals

基　　金：中央级公益性科研院所基本科研业务费专项(YYF201607);国家重点基础研究发展计划项目(2011CB403007)联合资助

摘　　要：近年来,硼同位素研究在指示沉积环境及物源方面取得了良好进展。通过开展清江盆地盐岩矿床泥岩段矿物组成、硼含量及XRD衍射实验、热电离质谱法测量硼同位素等实验手段,研究δ11B值变化与物源、沉积环境和气候作用的关系,分析影响清江盆地盐岩矿床硼同位素分馏因素,发现多源性可能成为δ11B发生变化的原因之一,粘土矿物优先吸附10B从而导致δ11B值降低,同时盐矿物序列变化和伊利石的减少表明该时期整体气候变化为干冷向温湿改变,可能伴随有河流改道而导致物源发生变化,从而影响δ11B值的变化。In recent years, good progress has been made in the study of boron isotopes in indicating sedimentary environment and provenance. The relationship between δ11B value and provenance, sedimentary environment and climate was studied by means of mineral composition, boron content and XRD diffraction experiments and measurement of boron isotopes by thermoelectric ionization mass spectrometry.The factors affecting boron isotopic fractionation of salt rock deposits in Qingjiang Basin are analyzed. It is found that multiple sources may be one of the reasons for the change of δ11B, and the preferential adsorption of 10B by clay minerals leads to the decrease of δ11B value. At the same time, the change of salt mineral sequence and the decrease of Illite indicate that the overall climate change in this period is from drying and cold to warmth and damp, which may lead to the change of provenance with the diversion of rivers, thus affecting the change of δ11B value.

关 键 词：硼同位素 泥岩 清江岩盐矿床 

分 类 号：P597.2[天文地球—地球化学] P619.231[天文地球—地质学]