西伯利亚克拉通Udachnaya金伯利岩管麻粒岩捕虏体中含硫斜辉石质:Mössbauer与micropoe资料比较

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-03-21 DOI:10.1134/S0869591123010083
A. V. Sapegina, M. V. Voronin, A. L. Perchuk, O. G. Safonov
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引用次数: 0

摘要

斜斜辉石中氮基端元(NaFe3+Si2O6)是由Fe3+掺入到矿物结构中引起的。它的存在影响了高变质岩中P-T条件重建的准确性,并有助于评价其形成的氧化还原条件。斜辉石中这种端元的含量通常是用微探针分析的晶体化学重新计算来估计的。然而,在一些关于榴辉岩的出版物中,将基于微探针的重新计算与Mössbauer数据进行比较,结果显示Fe3+/ΣFe的实测值与计算值存在显著差异,这将显著影响地热测量结果。本文介绍了乌达奇纳亚金伯利岩管中3个石榴石-斜辉石麻粒岩样品中斜辉石组分的Mössbauer光谱测量结果。斜斜石中测得的Fe3+/ΣFe = 0.22-0.26的比值相当于6-10 mol %的埃吉林。这些估计值与用电荷平衡法重新计算微探针分析得到的相同斜辉石的值很好地一致。根据这一结论,我们认为,通过对非榴辉岩斜辉石显微分析的晶体化学重新计算,可以正确估计其Fe3+含量。对来自其他地区的地壳捕虏体中的斜辉石进行类似的微探针分析,以及来自大陆洪泛玄武岩省的铁玄武岩、铁白云石岩脉和辉长岩捕虏体(与许多中下地壳捕虏体的总体化学成分相似)的微探针分析,发现了大量以前未计算的硫胺(分别高达13%和4% - 9%),这有可能破译许多岩石的氧化还原条件。
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Aegirine-Bearing Clinopyroxenes in Granulite Xenoliths from the Udachnaya Kimberlite Pipe, Siberian Craton: Comparison of the Mössbauer and Micropobe Data

The aegirine end-member (NaFe3+Si2O6) in clinopyroxenes resulted from incorporation of Fe3+ into the mineral structure. Its presence affects the accuracy of reconstruction of the P-T conditions in the high-grade metamorphic rocks and allows the evaluation of the redox conditions of their formation. The content of this end-member in clinopyroxenes is usually estimated using crystal chemical recalculations of microprobe analyses. However, in some publications on eclogites, the comparison of microprobe-based recalculations with Mössbauer data revealed significant difference between the measured and calculated Fe3+/ΣFe ratios, which can significantly affect the results of geothermometry. This paper presents the results of the Mössbauer spectroscopy measurements of clinopyroxene fractions separated from three samples of garnet–clinopyroxene granulites from the Udachnaya kimberlite pipe. The ratios Fe3+/ΣFe = 0.22–0.26 measured in the clinopyroxenes correspond to 6–10 mol % aegirine. These estimates are in good agreement with the values obtained for the same clinopyroxenes by the recalculation of microprobe analyses using the charge balance method. Following this conclusion, we believe that crystal chemical recalculations of microprobe analyzes of clinopyroxenes from non-eclogitic rocks make it possible to correctly estimate the Fe3+ content in them. Similar recalculation of microprobe analyses of clinopyroxenes in crustal xenoliths from other localities, as well as from ferrobasalts of the continental flood basalts provinces, ferrodolerite dikes, and gabbroid xenoliths (similar in bulk chemical composition to many lower–middle crustal xenoliths) revealed significant amounts of previously unaccounted aegirine (up to 13 and 4–9 mol %, respectively), which holds the potential for deciphering redox conditions in many rocks.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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