老挝龙湖矿区ZK309农波组中盐段泥岩层硼的地球化学特征研究

The Boron on the geochemical characteristics of NongBo group salt mudstone Strata in ZK309 Hole，longhu Dinggings, Laos

中文关键词:  老挝龙湖钾盐矿区  硼及硼同位素  混合水  吸附作用

英文关键词:Longhu potash mining area  boron and boron isotopic geochemical  mix water  adsorption

中文摘要:

      由于硼（B）在自然界中分布较集中，平均丰度低，而且11B和10B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判定硼来源的指相标志和沉积环境。老挝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，通过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；?11B的范围为+7.44‰到+11.62‰，平均+8.96‰，介于海水的?11B值（+39.5‰）及陆相地下水的δ11B值（-3±5‰）之间，B的含量认为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同位素研究认为粘土矿物的吸附作用是?11B降低的主要因素。

英文摘要:

      Boron in nature relatively concentrated distribution, the average B is low,11B and 10B have different quality. The fractionation effect is significant,so the boron and its isotopes composition may be used to determine the effective boron source indicator and facies marks.ZK309 drilling is the most representative in Longhu mining area, through the borehole rock overlying clast layer of boron and its isotopes analysis, B content (56×10-6～103×10-6,wt.%) , the average was 73×10-6,the 11B range from +7.44 ‰ to +11.62 ‰, obvious between seawater 11B value (+39.5‰) δ11B and the terrestrial groundwater value between-3±5‰. Through the content of boron analysis, the sedimentary process of salt rock salt has obvious water fluid activity, this water biased in the characteristics of fresh water and salt water, the boron isotopic constitute study adsorption of clay minerals is the main factor that makeδ11B reduced.