沉积盆地卤水来源的非传统同位素示踪研究进展

世界上大多数的沉积盆地内,在结晶基底或者沉积地层内都有矿化度较高的卤水,由于这些卤水通常携带或富含有钾、硼、锂、溴、碘、铷、铯、稀有气体及重金属元素,因此,它们是地学界的研究热点之一。随着测试技术的不断进步,非传统同位素的应用也日益广泛,但在沉积盆地卤水来源和演化方面的研究还十分薄弱,对卤水的来源和演化也还存在争议。文章回顾了硼、锂、碘和惰性气体氦、氩同位素在卤水来源研究方面的进展,并指出由于单一同位素在解释上的片面性,多种同位素相结合的示踪方法研究沉积盆地卤水的来源是国际趋势。

Progress in applying non-traditional isotopes to tracing origin of brines in sedimentary basins

The brines that exist in crystalline basements or sedimentary formations in most basins can carry metals and are rich in potassium, boron, lithium, bromine, iodine, rubidium, cesium, and noble gas which can be used as renewable energy, thus becoming one of the hot research spots among geologists. Nevertheless, due to the complicated water-rock interactions, the origin and evolution of brines remain a topic of much controversy. Although analytical technique has been developed rapidly, non-traditional isotopic systems remain very insufficiently applied to the study of the origin of the brines. In this paper, the authors review the theory of boron, lithium, iodine, and noble gas helium and argon isotopes and their application to the study of the origin and evolution of the brines. The use of only one isotopic tool might lead to an incomplete or one-sided interpretation of the origin of brines. The application of multi-isotopic approach to tracing the origin thus becomes a tendency.