矿物成因的不同理解造成的分析方法差异及其对环境指标解释的影响  

Differences in Analysis Methods and Data Caused by Different Understandings of Cognitive Minerals and Impact on Environmental Indicators

作　　者：李明慧[1] 王晓晓 朱立平[1,2] 李皎[1,3] 方小敏 LI Minghui;WANG Xiaoxiao;ZHU Liping;LI Jiao;FANG Xiaomin(Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences(CAS),Beijing 100101,China;College of Geosciences,Shanxi Normal University,Taiyuan,Shanxi 030031,China)

机构地区：[1]中国科学院青藏高原研究所,北京100101 [2]中国科学院青藏高原研究所青藏高原资源与环境国家重点实验室,北京100101 [3]山西师范大学地理科学学院,太原030031

出　　处：《中国无机分析化学》2023年第1期68-76,共9页Chinese Journal of Inorganic Analytical Chemistry

基　　金：第二次青藏科考项目(2019QZKK0202,2019QZKK0707);国家自然科学基金资助项目(41831177);中科院先导专项(XDA20020100,XDA20070101;XDA20070201)。

摘　　要：湖泊沉积物记录了大量环境信息,由于研究者对矿物成因的理解不同,从而在使用矿物元素和稳定同位素等环境指标的过程中,会使用不同的测试方法、获得不同的数据,进而解释为不同的环境信息。以碳酸盐矿物和石膏为例,实验表明,湖泊沉积物孔隙水、碳酸盐矿物、硅酸盐矿物和全样沉积物中的Mg/Ca摩尔比值存在明显的差异;细颗粒和沉积物全样中的碳酸盐矿物氧同位素存在明显差异;柴达木盆地相邻两个钻孔中石膏的结晶水氢氧同位素(δ^(18) O和δD)曲线差异明显,这些差异都可以从成因矿物学的角度进行解释。通过研究结果,希望引起更多学者重视成因矿物学的研究。Lake sediments that primary composed of minerals,are archives of paleoenvironments.Due to lack an understanding of the mineral origin and formation,there were different methods for the elements and stable isotopes of minerals and lake sediments.As a result,the difference in data curves of elements and stable isotopes,even in the same proxies from a same lake,caused different interpretations of environmental information.This study took carbonate minerals and gypsum as examples,to analyze the differences of Mg/Ca molar ratios in pore water,carbonate mineral,silicate mineral and bulk sample sediments,and the differences of the oxygen isotope of carbonate minerals in fine particles and bulk sediments,and the difference ofδ^(18)O andδD of gypsum hydrated water from two adjacent cores in Qaidam Basin.Their large differences can be explained from the perspective of genetic mineralogy and are enough to attract more researchers to pay attention to the study of mineral origin.

关 键 词：成因矿物学 碳酸盐矿物 石膏 氧同位素 MG/CA 结晶水 

分 类 号：O655[理学—分析化学]