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地球学报  2008 

新疆吐-哈地区硝酸盐矿床的氧同位素非质量效应

DOI: 10.3975/cagsb.2008.06.11

Keywords: 氧同位素,非质量效应,硝酸盐,硫酸盐,吐-哈地区

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Abstract:

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.

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