不同形态锶钡比的沉积环境判别效果比较

锶钡比是常用的沉积环境判别标志之一。通常以Ｓｒ/Ｂａ大于或小于１来判别海、陆相沉积环境，但实际应用过程中相互矛盾甚至相反现象的出现，使得人们对这一指标的可靠性产生了怀疑甚至否定。本文对现代黄河三角洲不同沉积环境的全样锶钡比（Ｓｒ/Ｂａ）_T和稀盐酸可溶性锶钡比（Ｓｒ/Ｂａ）_A进行了对比研究，结果表明，（Ｓｒ/Ｂａ）_T对沉积环境的变化反映不明显，而（Ｓｒ/Ｂａ）_A则具有明显的指相性，并认为前者是由于大量赋存于陆源碎屑矿物（如长石等）中的锶钡的掩蔽所致。

Discriminant Effect of Sedimentary Environment by the Sr/Ba Ratio of Different Exising Forms

The ratio of strontium to barium is a universal indicator for distinguishing depositional environments. Usually, the value of Sr/Ba more or less than 1 should be responsible for marine or continental deposit, respectively. However, the authenticity of this indicator has nowadays been suspected, even negated by most of sedimentologists and geochemists because of some contradictions or opposite explanations with geological facts. By comparison study of the ratio of (Sr/Ba) T ratio of total Sr to total Ba in bulk sediment analysis, and the ratio of (Sr/Ba) A ratio of dissolvable Sr to dissolvable Ba that were extracted in dilute hydrochloric acid from the different environment of the modern Yellow (Huanghe) river delta in this paper, it is suggested that the ratio of (Sr/Ba) T is not sensitive for environment variation while the (Sr/Ba) A shows the sensitive diversity with different sedimentary environments and, moreover,the former results are unreliable because of the disturbance of bulk Sr & Ba exiting in terrigenous minerals (for example, feldspar, biotite, ect.) over the Sr and Ba formed in sedimentation. Finally, an attempt is made to evaluate the method of distinguishing sedimentary environments in use of the ratio of strontium to barium.