高温Ca同位素地球化学研究进展与双稀释剂校正
发布时间：2019-07-18 07:50
【摘要】：近年来随着质谱和分析技术的进步,Ca同位素的分析精度获得了很大的提高,出现了很多高温条件下Ca同位素地球化学的研究成果。双稀释剂的合理使用在Ca同位素的分析中起关键作用。本文系统地阐述了前人对Ca同位素测试时所使用的双稀释剂技术,提供相应的计算程序,并且系统地归纳近年来高温条件下Ca同位素地球化学研究的新成果,包括单矿物对之间Ca同位素的分馏、陨石和地幔Ca同位素组成的不均一性和陨石的εCa异常及K-Ca定年等。斜方辉石和橄榄石相比于共生的单斜辉石更富集重Ca同位素,并且Δ44/40 CaOpx-Cpx受斜方辉石Ca含量和Ca—O键长的影响。地幔矿物之间具有不相同的Ca同位素组成说明地幔Ca同位素组成的不均一性。陨石及其内部难熔包裹体的Ca同位素组成变化范围很大,并且普遍存在εCa的异常。顽火辉石球粒陨石与地球具有相近的Ca同位素组成,表明它们可能具有相同的起源。但是高温条件下Ca同位素的分馏研究仍处于起步阶段,未来对于地球主要储库的Ca同位素组成、岩浆过程(部分熔融和分离结晶)和洋壳俯冲过程的Ca同位素分馏仍然需要更多地研究。
[Abstract]:In recent years, with the progress of mass spectrometry and analytical technology, the analysis accuracy of Ca isotopes has been greatly improved, and a lot of research results of Ca isotopic geochemistry at high temperature have appeared. The rational use of double diluents plays a key role in the analysis of Ca isotopes. In this paper, the double diluent techniques used in Ca isotopic testing are systematically described, and the corresponding calculation programs are provided, and the new results of Ca isotopic geochemistry under high temperature conditions in recent years are systematically summarized, including the fractionation of Ca isotopes between single mineral pairs, the heterogeneity of Ca isotopic composition between meteorite and mantle, the 蔚 Ca anomaly of meteorite and K-Ca dating, and so on. Compared with the symbiotic clinopyroxene and olivine, clinopyroxene and olivine are more abundant in Ca isotopes, and 螖 44 鈮，
本文编号：2515741
[Abstract]:In recent years, with the progress of mass spectrometry and analytical technology, the analysis accuracy of Ca isotopes has been greatly improved, and a lot of research results of Ca isotopic geochemistry at high temperature have appeared. The rational use of double diluents plays a key role in the analysis of Ca isotopes. In this paper, the double diluent techniques used in Ca isotopic testing are systematically described, and the corresponding calculation programs are provided, and the new results of Ca isotopic geochemistry under high temperature conditions in recent years are systematically summarized, including the fractionation of Ca isotopes between single mineral pairs, the heterogeneity of Ca isotopic composition between meteorite and mantle, the 蔚 Ca anomaly of meteorite and K-Ca dating, and so on. Compared with the symbiotic clinopyroxene and olivine, clinopyroxene and olivine are more abundant in Ca isotopes, and 螖 44 鈮，
本文编号：2515741
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