摘要
碳酸盐岩中测定碳酸盐矿物的稀土元素主要有酸溶-ICP-MS和LA-ICP-MS方法。酸溶-ICP-MS方法用盐酸、硝酸溶解碳酸盐矿物,但也能溶解部分非碳酸盐矿物,而影响分析结果;用醋酸溶样可避免非碳酸盐矿物的干扰,但可能没有溶样完全,同样影响分析结果。LA-ICP-MS是应用激光对碳酸盐矿物进行原位剥蚀,将蒸发物导入ICP-MS进行分析,对不含粘土等的碳酸盐矿物最有效,由于激光束光斑较大,且碳酸盐岩中普遍含有微小的粘土矿物,可能也存在不确定性。总体而言,酸溶-ICP-MS和LA-ICP-MS获得的稀土元素页岩标准化配分模式及主要参数相似,均可用于沉积环境的示踪。
Solution-ICP-MS and LA-ICP-MS are the most common analytical methods for measuring rare earth elements in carbonate minerals of carbonate rocks.HCl and HNO3 not only can completely dissolve carbonate minerals in carbonate rocks but also dissolve some other minerals,and such will disturb the analytical results.CH3COOH,on the other hand,can avoid interferences from non-carbonate minerals,but probably cannot completely dissolve carbonate minerals in carbonate rocks,and such will also cause bias from the true result.LA-ICP-MS,which uses laser beam to ablate carbonate minerals and directly analyze rare earth elements contents in the evaporation,is an effective method for analyzing carbonate mineral crystals in carbonate rocks.But this method may also be questionable since the diameter of the laser beam may be too large to avoid tiny clay minerals in carbonate minerals.In summary,the results obtained by solution-ICP-MS and LA-ICP-MS on the shale-normalized REE patterns and their main parameters of carbonate minerals in carbonate rocks are comparable,and both methods can be used to trace the sedimentary environment.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2012年第2期177-183,共7页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
中国科学院边缘海地质重点实验室开放基金资助项目(MSGL11-1)
中国科学院可再生能源与天然气水合物重点实验室开放基金资助项目(0807K8)
中国科学院重要方向项目(KZCX2-YW-GJ03)
关键词
稀土元素
分析方法
碳酸盐矿物
碳酸盐岩
rare earth element
analytical method
carbonate minerals
carbonate rocks
