利普尼亚日卡地块西北边界(乌克兰地盾Inhul域)变长岩中石墨的成因

IF 0.5 Q4 MINERALOGY Mineralogical Journal-Ukraine Pub Date : 2021-01-01 DOI:10.15407/mineraljournal.43.02.012
N. Lyzhachenkо, S. Kurylо, S. Bondarenko, R. Milovský, S. Milovská
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引用次数: 0

摘要

本文介绍了位于利普尼亚日卡花岗混辉岩地块(乌克兰地盾Inhul域)西北边界的Inhul- inhulets系列变质岩的研究结果。对岩石进行了岩相学、矿物学、碳同位素、拉曼光谱和显微测量。石墨和方解石得到了特别的关注。研究了变质长岩和富石英的石墨黑云母石榴石岩。前者由黑云母、石墨黑云母、含角闪岩的石墨黑云母片麻岩组成。石墨均匀地分布在岩石中。石墨的δС13值介于-39.4‰~ -33.6‰之间(相对于PDB)。石墨被认为是生物成因的。富含石英的石墨黑云母石榴石不太常见,但它们也含有石墨。后者以包裹体的形式出现在主要矿物中,或者形成团簇。其δС13值介于-28.45‰和-22.2‰之间(相对于PDB)。基于拉曼光谱,片麻岩中的碳具有有序的石墨结构。石墨结晶温度在554 ~ 630°С之间,对应于角闪岩相。
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Genesis of Graphite in Metapelites in the North-Western Border of the Lypniazhka Massif (the Inhul Domain of the Ukrainian Shield)
This study presents results of an investigation of metamorphic rocks of the Inhul-Inhulets series located in the northwestern border of the Lypniazhka granite-migmatite massif (Inhul domain, the Ukrainian Shield). The rocks were studied petrographically and mineralogically and carbon isotope, Raman spectroscopic and microprobe measurements were made. Graphite and calcite were given special attention. Metapelites and quartz-rich graphite-biotite-garnet rocks were investigated. The former consist of biotite, graphite-biotite, amphibole-bearing graphite-biotite gneisses. Graphite in them is evenly distributed through the rock groundmass. The δС13 values of graphite lie between -39.4‰ and -33.6‰ (relative to PDB). The graphite is considered to be of biogenic origin. Quartz-rich graphite-biotite-garnet rocks are less common, but they also contain graphite. The latter occurs as inclusions in the major minerals either forming clusters. Its δС13 values fall between -28.45‰ and -22.2‰ (relative to PDB). Based on the Raman spectra, carbon from the gneisses has an ordered graphite structure. The temperature of graphite crystallization was estimated to be between 554 and 630°С and corresponds to the amphibolite facies.
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