Genesis of Dunite from the Guli Puton according to Olivine-Hosted Melt Inclusion Data

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-04-22 DOI:10.1134/S0869591124020061
L. I. Panina, A. T. Isakova, E. Yu. Rokosova
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Abstract

Olivine from the dunite of the Guli pluton crystallized from olivine–melanephelinite magma at temperatures above 1260°C according to the melt inclusion study. The melts were enriched with volatile components (S, CO2, F, H2O, slightly Cl) and contained high amount of incompatible elements. In addition, olivine hosts sporadic inclusions of picrite-basalt composition, which are close to picrite–meimechite melts preserved in chromite from dunite according to literature data. This suggests the influx of picrite–meimechite melts and their mixing with melanephelinite magma during the formation of dunites in the magma chamber. Based on the indicator ratios of incompatible elements, these melts and melanephelinite magma had different sources, which were located in undepleted mantle at different depths and derived through different degree of partial melting.

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根据橄榄石寄生熔融包体数据看古力普顿的 Dunite 的成因
根据熔融包裹体研究,古里岩体的云英岩中的橄榄石由橄榄石-梅兰橄榄石岩浆在1260°C以上的温度下结晶而成。熔体中富含挥发性成分(S、CO2、F、H2O、少量 Cl),并含有大量不相容元素。此外,橄榄石中还夹杂着零星的闪长岩-玄武岩成分的包裹体,根据文献数据,这些包裹体与白云母铬铁矿中保存的闪长岩-梅氏岩熔体相近。这表明在岩浆室形成云英岩的过程中,闪长岩-梅氏岩熔体流入并与黑云母岩浆混合。根据不相容元素的指标比例,这些熔体和黑云母岩浆有不同的来源,它们位于不同深度的未贫化地幔中,并通过不同程度的部分熔化而得到。
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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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