摘要
以测定Ｃｓ２ＢＯ＋２离子的热电离质谱法，用ＶＧ－３５４型质谱计测定了大柴达木盐湖卤水及其外围水系的硼同位素组成。其卤水的δ１１Ｂ值为＋４．９６‰－＋９．ｌｌ‰，外围水系的δ１１Ｂ值为－３．８５‰－－４２．６８‰。同时也测定了其湖底沉积物、外围碳酸盐泉华和硼酸盐的硼同位素组成。它们的δ１１Ｂ值分别为－１７．７８‰－＋２．５６‰、－３１．９７‰－＋０．１７‰和－１１．８７‰－－９．５９‰。这些资料说明了该区硼同位素分馏作用是存在的。实验结果证明：粘土吸附、碳酸盐沉淀和硼酸盐析出是影响该区硼同位素分馏的重要因素。
The boron isotopic composition in the brines of Da Qaidam Salt Lake and its surrounding waters has been determined by VG-354 model mass spectrometry with the Cs2BO+2 ion being measured by thermal technique. The δ11B value of brines is +4.96‰-+9.11‰, and that of surrounding waters-42.68‰--3.85‰. The composition of the bottom sediments. carbonate sinters and borates has been measured as well. Their values of δ11B are -17 . 76‰-+2. 56‰, -31 .97‰-+0. 1 7‰ and-11.87‰--9.59‰, respectively. The above data illustrate the existance of the fractionation of boron isotopes in this area. The experimental results have proved that the adsorption by clay, carbonate separation and borate deposition has important influence on boron isotopic fractionation in the studied area.
出处
《地球化学》
CAS
CSCD
北大核心
1996年第3期277-285,共9页
Geochimica
