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由于硼(B)在自然界中分布较集中,平均丰度低,而且~(11)B和~(10)B之间质量差大,分馏效应显著,故元素硼及其同位素组成可以作为指相标志来判定硼来源和沉积环境。龙湖钾盐矿区是呵叻高原钾盐矿在老挝境内最主要的矿区之一,ZK309钻孔在龙湖矿区具有代表性。对该钻孔盐岩上覆碎屑层的硼元素及其同位素的分析,B含量56×10~(-6)~103×10~(-6)(wt.%),平均值为73×10~(-6);δ~(11)B的范围为+7.44‰到+11.62‰,平均+8.96‰,介于海水的δ~(11)B值(+39.5‰)及陆相地下水的δ~(11)B值(-3±5‰)之间,B的含量指示中盐段岩盐层沉积后期曾明显有水流体的活动,这种水流体表现出偏向于淡水、咸水混合水特征,而B同位素研究说明粘土矿物的吸附作用是δ~(11)B降低的主要因素。
Because boron (B) is more concentrated in nature and has lower average abundance, and the mass difference between ~ (11) B and ~ (10) B is large and the fractionation effect is significant, elemental boron and its isotopic compositions can be referred to as phase Logo to determine the source of boron and sedimentary environment. The Longhu Potash Mine is one of the most important mining areas in the Korat Plateau Potash Mine in Laos. The ZK309 borehole is representative of the Longhu Mine. Analysis of boron element and its isotopes in the overlying detritus of the drilling salt rock shows that B content is 56 × 10 -6 ~103 × 10 -6 (wt.%) With an average value of 73 × 10 ~ (-6); δ ~ (11) B ranged from + 7.44 ‰ to + 11.62 ‰ and averaged + 8.96 ‰, ranging from δ ~ (11) B value of seawater ~ (11) B value (-3 ± 5 ‰), and the content of B indicates that there was a significant activity of water fluid in the sedimentary stage of salt rock in the salt section of the salt section. This fluid showed a tendency of being biased toward freshwater and brackish water , While B isotope studies indicate that the adsorption of clay minerals is the main factor for the decrease of δ ~ (11) B.