C和O稳定同位素在矿层沉积环境分析方面的应用

Application of C and O stable isotopes in the analysis of deposit sedimentary environment

为了精确恢复地区的矿层性质、沉积环境和沉积特征,对于稳定同位素的地球化学分析研究尤其重要,主要是对C和O同位素的分析,从而可推断出当时的沉积环境和气候条件。对于样品中元素的异常进行了分析,采用多接收电感耦合等离子体质谱仪(MC-ICP-MS)对同位素比值进行了测定,使用δ(‰)=(R样品/R标准-1)×1000来表示。对于碳氧同位素的研究表明,其与沉积环境具有一定的相关性,同时古环境中各类碳酸盐岩的碳、氧稳定同位素组成也受到沉积作用和成岩作用的影响,随之发生变化,进而我们可以利用碳氧同位素的原始沉积信息来推断当时的沉积环境。

In order to accurately restore the ore bed properties,sedimentary environment and sedimentary characteristics of the area,it is particularly important to study the geochemical analysis of stable isotopes,mainly the analysis of C and O isotopes,so as to infer the sedimentary environment and climatic conditions at that time.The anomaly of elements in the sample was analyzed,and the isotope ratio was determined by multi receiver inductively coupled plasma mass spectrometry (MC-ICP-MS),which was represented by δ (‰)=(rsample / rstandard-1) × 1000.The study of carbon and oxygen isotopes shows that there is a certain correlation between carbon and oxygen isotopes and sedimentary environment.At the same time,the stable carbon and oxygen isotopic compositions of various carbonate rocks in Paleoenvironment are also affected by sedimentation and diagenesis,and then change accordingly.We can infer the sedimentary environment by using the original sedimentary information of carbon and oxygen isotopes.