论文部分内容阅读
本文报道了黔北、黔东地区三个碳酸盐岩风化壳剖面中晶体石英的δ30Si值,利用硅同位素作为示踪剂,通过分析剖面中晶体石英的硅同位素组成来判别其硅质来源。结果表明:晶体石英的δ30Si值在0.8‰~1.7‰范围内,具有较高的同位素组成特征,与火山和热液(水)作用产物的δ30Si值不同,结合已有的资料证明晶体石英与火山或热液(水)作用无直接关系,而是来自碳酸盐岩酸不溶物中含硅物质风化产生的硅质流体,其中以硅酸矿物风化释放的硅质流体为主。利用植物岩中Ge/Si很小的特点来验证植物作用对研究剖面中硅质流体的影响,结果表明植物作用的贡献相对较小,但在表土层植物作用的影响可能不容忽视。
This paper reports δ30Si values of crystalline quartz in three carbonate weathering crust sections in northern Guizhou and eastern Guizhou Provinces, and uses silicon isotopes as tracer to determine the source of silica from the quartz isotope composition of crystalline quartz in the section. The results show that the δ30Si value of crystalline quartz is high in the range of 0.8 ‰ to 1.7 ‰, which is different from the δ30 Si value of volcanic and hydrothermal (water) interaction products. The results show that crystalline quartz and volcano Or hydrothermal (water) is not directly related to the effect, but from the silicate fluid generated by the weathering of the silicon-containing material in the carbonate acid-insoluble matter, of which the silicic fluid is mainly silicified fluid. The effect of plant function on the siliceous fluid in the study section is verified by the small Ge / Si in plant rocks. The results show that the contribution of plant function is relatively small, but the influence of plant function in topsoil may not be neglected.