摘要
随着分析测试技术的提高以及同位素分馏理论的进步,氧同位素非质量分馏的应用范围已经从太空拓展到地球,逐渐发展成为研究行星和地球早期演化、地球表面各圈层相互作用的重要途径和手段。硝酸盐和硫酸盐是地球上少数几个具有明显氧同位素非质量分馏效应的矿物。本文测定了新疆吐-哈地区硝酸盐矿床中硝酸盐和硫酸盐矿物的氧同位素组成,结果显示,硝酸盐的氧同位素存在明显的非质量分馏效应,△17O高达14‰,δ18O高达40‰。为该超大型硝酸盐矿床的大气沉积成因提供了可靠依据。
With the development of analyzing and measuring techniques and Mass independent isotope fractionation methods, the application of mass independent oxygen isotope fractionation has been used in an increasingly wider field, and has become an important method for studying the evolution of the early earth and the interaction between different circles on the earth. Nitrates and snlfites compose a few existent minerals that have mass independent oxygen isotope fractionation. The authors measured oxygen isotope composition of nitrate and sulfite minerals in the Turpan-Hami Area of Xinjiang, and the results show that there exists obvious mass independent oxygen isotope fraetionation in nitrates and slight mass independent oxygen isotope fractionation in sulfites. This paper provides evidence that long-term atmospheric deposition makes up the source of supedarge nitrate deposits.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2008年第6期729-734,共6页
Acta Geoscientica Sinica
基金
国家自然科学基金项目(编号:40673006
40873003)
国土资源部同位素地质重点实验室
中国地质大学(北京)地质过程与矿产资源国家重点实验室联合资助
关键词
氧同位素
非质量效应
硝酸盐
硫酸盐
吐-哈地区
oxygen isotope
mass independent fractionation
nitrate
sulfite
Turpan-Hami Area
