石榴石-正辉石-橄榄石氧压计的误差

IF 2.5 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Chun-Ming Wu, Hui C.G. Zhang
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引用次数: 0

摘要

Stagno et al. (2013, Nature, 493: 84-88)的石榴石-正辉石-橄榄石氧气压计重建实验氧逸度(以其共同对数logfO2表示)的误差在±1.2 log单位以内,虽然实验数据不够充分,但该氧气压计在六个不同版本中相对最精确。如果采用电荷平衡法估算相关相的铁含量,则计算的logfO2值会错误地增加到>;与直接实验测量法测定的铁含量相比,所有氧压计都增加了0.5个对数单位。输入压力-温度(P-T)误差为+3 kbar/+70°C或- 3 kbar/ - 70°C,可能分别传播到logfO2误差为+0.48 ~ +1.60 log单位或- 0.52 ~ - 1.31 log单位的氧气压计。石榴石-正辉石-橄榄石氧压计的应用确实需要直接测量相中的铁含量,如Mössbauer光谱、同步加速器铁边缘x射线吸收近边缘结构光谱(XANES)或侧面法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Errors of the garnet-orthopyroxene-olivine oxybarometers
The errors in rebuilding the experimental oxygen fugacity (expressed as its common logarithm, logfO2) of the Stagno et al. (2013, Nature, 493: 84–88) garnet-orthopyroxene-olivine oxybarometer are within ±1.2 log units and this oxybarometer is relatively the most precise one among the six different versions, although experimental data are not sufficient. If we adopt ferric iron contents of the related phases estimated by charge balance method, the computed logfO2 values were erroneously increased to > + 0.5 log units for all the oxybarometers compared to those determined by direct experimental measuring methods of ferric iron contents. Input pressure-temperature (P-T) errors of +3 kbar/+70 °C or − 3 kbar/−70 °C may propagate to logfO2 errors of +0.48 ∼ +1.60 log units or − 0.52 ∼ −1.31 log units, respectively, for the oxybarometers. Application of the garnet-orthopyroxene-olivine oxybarometers does need direct measurement of ferric contents of the phases, such as Mössbauer spectroscopy, synchrotron Fe-edge X-ray absorption near edge structure spectroscopy (XANES) or flank method.
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来源期刊
Lithos
Lithos 地学-地球化学与地球物理
CiteScore
6.80
自引率
11.40%
发文量
286
审稿时长
3.5 months
期刊介绍: Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.
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