Petrogenesis of microgranular enclaves in the A-type granitoid Krasnopol intrusion (Mazury Complex, northeastern Poland): Evidence of magma mixing

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Justyna Domańska-Siuda, Anna Grabarczyk-Gurba, Krzysztof Nejbert
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Abstract

The origin of magmatic microgranular enclaves has been investigated in the Mesoproterozoic granitoid Krasnopol intrusion (1.5 Ga), part of the AMCG (anorthosite–mangerite–charnockite–granite) Mazury Complex in the East European Craton (NE Poland). The granitoids are ferroan and metaluminous, and display the typical characteristics of A-type granites, with high contents of Zr, Nb, Ga and rare earth elements (REEs). The enclaves are metaluminous and have a broad compositional range with two groups distinguished: silica-poor (45–50 wt% SiO2) and silica-rich (54 to 59 wt% SiO2), the latter overlapping in composition with the granitoid samples. The silica-poor enclaves are enriched in REEs compared to the silica-rich type, while the silica-rich enclaves exhibit trace-element patterns similar to those of the granitoids. Initial whole rock εNd values range between -3.8 and -4.0 for the granitoids and give a slightly wider range from -2.6 to -3.8 for the enclaves. The 87Sr/86Sr initial values vary from 0.7084 to 0.7138 for the granitoids and between 0.7052 and 0.7075 for the enclaves and indicate that the granitoids and enclaves are not isotopically identical. These may suggest that the two magmatic systems represented by the granitoid host rock and the enclaves, were probably derived from different sources, but with sufficient interaction, which led to a progressive change in the composition of the enclaves towards intermediate composition. We suggest that the mafic melts of the enclaves were generated at the base of the thickened crust through partial melting of the lower crustal source, with a significant contribution from mantle material. The increase in temperature resulted in anatexis of the lower crust and the formation of the granitoid parental magma.

Abstract Image

A 型花岗岩克拉斯诺波尔侵入体(波兰东北部马祖里复合体)中微晶粒飞地的岩石成因:岩浆混合的证据
在中新生代花岗岩克拉斯诺波尔侵入体(1.5 Ga)中研究了岩浆微晶飞地的起源,克拉斯诺波尔侵入体是东欧克拉通(波兰东北部)AMCG(正长岩-黑云母-石榴石-花岗岩)马祖里复合体的一部分。花岗岩为铁质和金属铝质,具有 A 型花岗岩的典型特征,其中锆、铌、镓和稀土元素(REEs)含量较高。飞地为金属铝质,成分范围广泛,分为两类:贫硅(二氧化硅含量为 45-50 wt%)和富硅(二氧化硅含量为 54 至 59 wt%),后者与花岗岩样本的成分重叠。与富含二氧化硅的类型相比,贫硅飞地富含稀土元素,而富含二氧化硅的飞地则表现出与花岗岩类似的痕量元素模式。花岗岩的初始全岩εNd值介于-3.8和-4.0之间,而飞地的εNd值范围稍宽,介于-2.6和-3.8之间。花岗岩的 87Sr/86Sr 初始值在 0.7084 至 0.7138 之间,飞地的 87Sr/86Sr 初始值在 0.7052 至 0.7075 之间,这表明花岗岩和飞地在同位素上并不完全相同。这可能表明,花岗岩主岩和飞地所代表的两个岩浆系统可能来自不同的来源,但有充分的相互作用,导致飞地的成分逐渐向中间成分转变。我们认为,飞地的岩浆熔体是在增厚的地壳底部通过下地壳源的部分熔化而产生的,其中地幔物质的贡献很大。温度的升高导致了下地壳的膨胀,并形成了花岗岩母岩浆。
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来源期刊
Mineralogy and Petrology
Mineralogy and Petrology 地学-地球化学与地球物理
CiteScore
2.60
自引率
0.00%
发文量
0
审稿时长
1 months
期刊介绍: Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.
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