Experimental Studies of Basaltic Melt Contamination by Sedimentary Rocks

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Petrology Pub Date : 2025-12-03 DOI:10.1134/S0869591125700249

A. V. Kostyuk, N. S. Gorbachev, M. P. Novikov, A. N. Nekrasov

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Abstract

The results of experimental study of basaltic melt interaction with different types of sedimentary rocks of the platform shield of the Norilsk region are presented. To study the contamination of basaltic melt with host rocks, the following rocks were used in the experiments: Mokulaev basalt, sandy mudstone, pyrite-bearing sandstone with carbonaceous matter, bituminous dolomite, and marl–anhydrite rock. The experiments were carried out at the Korzhinskii Institute of Experimental Mineralogy of the Russian Academy of Sciences (IEM RAS) in a high-temperature furnace at 1 atm, 1250°C. The phase and chemical composition of the coexisting mineral associations and melts were studied, and geochemical and isotopic data on the starting and experimental products were given. It was found that the contamination of basaltic melt with sulfur- and carbon-bearing rocks of the platform cover of the Norilsk region can lead to silicate–sulfide liquid immiscibility, differentiation, and high ore potential of the trap magma. Results of experimental studies can be used to develop criteria for prospecting and forecasting of sulfide magmatic deposits.

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玄武岩熔体受沉积岩污染的实验研究

本文介绍了诺里尔斯克地区台地盾构不同类型沉积岩与玄武岩熔体相互作用的实验研究结果。为研究玄武岩熔体受载岩污染情况，研究对象为Mokulaev玄武岩、砂质泥岩、含黄铁矿含碳砂岩、沥青白云岩和泥灰质硬石膏岩。实验在俄罗斯科学院科尔津斯基实验矿物学研究所（IEM RAS）的高温炉中进行，温度为1atm， 1250°C。研究了共生矿物组合和熔体的物相和化学组成，给出了起始产物和实验产物的地球化学和同位素数据。研究发现，玄武岩熔体受诺里尔斯克地区台地盖层含硫、含碳岩石的污染，可导致圈闭岩浆的硅酸盐-硫化物液体不混溶、分异和高找矿潜力。实验研究结果可为硫化物岩浆矿床的找矿和预测提供依据。

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来源期刊

Petrology 地学-地球科学综合

CiteScore

2.40

自引率

20.00%

发文量

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.