Metasomatism in the Precambrian Crust of the Siberian Craton: Results of a Study of Garnet(±Orthopyroxene)–Biotite–Feldspar Xenolith Rocks from Yubileinaya and Sytykanskaya Kimberlite Pipes, Yakutia

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-04-22 DOI:10.1134/S0869591124010090
N. E. Seliutina, O. G. Safonov, V. O. Yapaskurt, D. A. Varlamov, I. S. Sharygin, K. M. Konstantinov, V. M. Kozlovskiy
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Abstract

Xenoliths in kimberlites are the most promising material for studying the composition and structure of the lower levels of the continental crust. This study is aimed at the estimation of P–T parameters and fluid regime of metamorphism for garnet–biotite–feldspar and orthopyroxene–garnet–biotite–feldspar rocks found as xenoliths in kimberlites of the Yubileynaya and Sytykanskaya pipes, Yakutian kimberlite province. The seven studied samples show inverse dependences of relative contents of garnet and orthopyroxene, orthopyroxene and biotite, garnet and plagioclase, plagioclase and potassium feldspar. This indicates a consistent series of transformations of the assemblage garnet + plagioclase + orthopyroxene ± quartz to the assemblage garnet + biotite + potassium feldspar. In this process, the replacement of plagioclase by potassium feldspar was the leading reaction. Evidence of this reaction is specific reaction textures in the rocks, negative correlations between the contents of the minerals, and petrochemical characteristics of the rocks. Modeling of the mineral assemblages of the xenoliths using the pseudosection approach (PERPLE_X) revealed two groups of rocks corresponding to different depth levels of the Siberian cratonic crust. For rocks without orthopyroxene or with this mineral as single relics, the pressure was estimated at 9.5–10 kbar, and it is 6–7 kbar for orthopyroxene-bearing samples. The xenolith rocks have close metamorphic peak temperatures of 750–800°C. They experienced 200–250°C cooling and 3–4 kbar decompression, regardless of the level of the crust at which they had initially occurred. This indicates that the metamorphic evolution of the rocks during their exhumation was probably associated with collisional processes during the amalgamation of individual terrains of the Siberian craton. Xenoliths enriched in K-feldspar might have been products of metamorphic reactions with participation of aqueous–(carbonic)–salt fluids, which were sourced from basaltic magmas in the lower crust. The most strongly metasomatized rocks were located closest to the place of accumulation of crystallizing magmas.

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西伯利亚克拉通前寒武纪地壳中的变质作用:来自雅库特 Yubileinaya 和 Sytykanskaya 金伯利岩岩坑的石榴石(± 奥陶斜长石)-生物长石异长岩的研究结果
摘要 金伯利岩中的闪长岩是研究大陆地壳低层组成和结构的最有前途的材料。本研究旨在估算在雅库特金伯利岩区 Yubileynaya 和 Sytykanskaya 管道的金伯利岩中发现的石榴石-生物长石和正长石-石榴石-生物长石异长岩的 P-T 参数和变质流体机制。所研究的七个样本显示了石榴石和正长石、正长石和斜长石、石榴石和斜长石、斜长石和钾长石相对含量的反比关系。这表明石榴石+斜长石+正长石±石英组合到石榴石+斜长石+钾长石组合的一系列转化过程是一致的。在这一过程中,钾长石取代斜长石是最主要的反应。这种反应的证据是岩石中特定的反应纹理、矿物含量之间的负相关以及岩石的石油化学特征。利用假吸积法(PERPLE_X)建立的岩石矿物组合模型显示,有两组岩石对应于西伯利亚板块地壳的不同深度。对于不含正辉石或只含正辉石的岩石,压力估计为 9.5-10 千巴,而对于含正辉石的样品,压力估计为 6-7 千巴。异质岩的变质峰值温度接近 750-800°C。它们经历了 200-250°C 的冷却和 3-4 千巴的减压,与最初发生的地壳水平无关。这表明,这些岩石在出露过程中的变质演化可能与西伯利亚陨石坑各个地形汞齐化过程中的碰撞过程有关。富含钾长石的异长岩可能是变质反应的产物,其中有来自下地壳玄武质岩浆的含水(碳酸)盐类流体的参与。变质作用最强烈的岩石位于最靠近岩浆结晶聚集地的地方。
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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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