Properties of Fluids during Metasomatic Alteration of Metamorphic Rocks under P–T Conditions of the Middle Crust: An Example from the Bolshie Keivy Region, Belomorian–Lapland Orogen, Fennoscandian Shield

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-07-15 DOI:10.1134/S0869591124700097
S. A. Bushmin, Y. A. Vapnik, M. V. Ivanov, A. B. Kol’tsov, Y. M. Lebedeva, O. V. Aleksandrovich, E. V. Savva
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Abstract

Properties of fluids under P–T conditions of the middle crust were studied with reference to the metasomatic alteration of metamorphic rocks (amphibolite facies) of the Bolshie Keivy nappe of the Keivy terrane of the Belomorian–Lapland collision orogen of the Fennoscandian shield. Properties of the fluids were studied in five selected types of rocks: metamorphic schists and gneisses with graphite, metasomatic quartz rocks with a high content of graphite, kyanite–quartz veins with wall-rock metasomatites, and metasomatic quartz-bearing kyanite rocks and anchimonomineral quartz veins. NaCl, CaCl2, CO2, N2, CH4, heavier hydrocarbons, and graphite were identified in the fluid inclusions using microthermometry and Raman spectroscopy. Using the method of multiequilibrium thermobarometry for mineral associations and the density of CO2 inclusions, a retrograde P–T path was calculated, which reflects the P–T exhumation history of the rocks. An explanation was proposed for the presence of water inclusions with NaCl of low salinity among inclusions of high salinity with NaCl and CaCl2. Comparison of data on the H2O activity (inferred from mineral equilibria) and salt content (data on fluid inclusions) with those of a model fluid (thermodynamic model of the H2O–NaCl–CaCl2–CO2 system) showed a good agreement between natural and model data. Natural and model data were synthesized to analyze variations in the phase state and chemical composition, fluid properties, including H2O activity, density, and salinity along the retrograde P–T trend.

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中地壳 P-T 条件下变质岩变质蜕变过程中流体的性质:以芬诺斯堪地盾贝洛莫利亚-拉普兰造山带博尔希-凯维地区为例
研究了中地壳 P-T 条件下的流体性质,并参考了芬诺斯康地盾贝洛莫利亚-拉普兰碰撞造山带基维地层博尔希基维岩脉变质岩(闪长岩面)的变质蚀变情况。在五种选定的岩石中研究了流体的性质:含石墨的变质片岩和片麻岩、石墨含量高的变质石英岩、含壁岩变质岩的辉绿岩-石英脉、含辉绿岩的变质石英岩和锚定矿物石英脉。利用微测温和拉曼光谱鉴定了流体包裹体中的 NaCl、CaCl2、CO2、N2、CH4、较重的碳氢化合物和石墨。利用矿物关联的多平衡热压法和二氧化碳包裹体的密度,计算出了一条逆行的 P-T 路径,反映了岩石的 P-T 排泄史。提出了在高盐度的氯化钠和氯化钙包裹体中存在低盐度氯化钠水包裹体的解释。将 H2O 活性数据(根据矿物平衡推断)和盐含量数据(流体包裹体数据)与模型流体数据(H2O-NaCl-CaCl2-CO2 系统热力学模型)进行比较后发现,天然数据与模型数据非常一致。综合自然数据和模型数据,分析了沿逆行 P-T 变化趋势的相态和化学成分、流体性质(包括 H2O 活性、密度和盐度)的变化。
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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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