摘要
针对在运用锶钡比值判定沉积环境时所出现的一些问题进行了探讨。分析认为影响锶钡比值判定沉积环境准确性的主要因素为 :陆相盐湖的高SO42 - 含量 ,陆源碎屑矿物中呈硅酸盐矿物结构态的锶钡 ,锶置换钙进入方解石或文石中对锶钡比值的影响 ,在进行锶钡比值分析时必须给予充分考虑。在此基础上对东濮盐湖下第三系沙河街组锶、钡含量及锶钡比值进行了分析。结果表明 :东濮盐湖从沙四上段到沙三下段时期为蒸发析盐的初期 ,而在沙三中段为蒸发析盐的强烈时期。沙三中段过后 ,该区的降雨量稍有增大 ,但从沙三上段到沙一段的锶钡比都远大于 1 ,可推测该区当时的气候仍是以干旱为主。
The paper mainly discussed some problems rising in the application of the ratio of strontium to barium on the identifying sedimentary.Through the analysis,three factors mainly affect the precise of the application of the ratio of strontium to barium on the identifying sedimentary.First,the high SO 4 2- content of continental saline lake.Second,the strontium and barium exiting in the state of silicate's mineral structure of terrigenous minerals.Third,the strontium replaced barium and went into calcite and aragonite.So we must consider these three factors when we analyze the value of Sr/Ba.At the same time the paper also analyzed the content of strontium and barium and the ratio of strontium to barium.The analysis indicated that the Dongpu saline lake was at the initial stage of evaporation from the upper segment of Shasi to the lower segment of Shasan,and in the middle of Shasan the evaporation was very strong.After the middle of Shasan,the rainfall slightly increased.And because the value of Sr/Ba was far bigger than one,we can speculate that the climate was still arid in this area.
出处
《断块油气田》
CAS
2003年第2期12-16,共5页
Fault-Block Oil & Gas Field
关键词
锶钡比
沉积环境
可行性分析
东濮盐湖
沙河街组
地球化学勘探
矿物结构
Ratio of strontium to barium,Identification of sedimentary environment,Dongpu Saline Lake,Shehejie formation.
