鄂洪地区Birkhin地块富钙超镁铁岩、安卡拉岩和斜辉石质-斑岩辉长岩:原生熔体问题的解决及岩体的形成

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-07-10 DOI:10.2113/rgg20234571

E. Pushkarev, A. V. Lavrenchuk, I. Gottman, E. Sklyarov

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引用次数: 0

摘要

–本文提供了关于奥洪地区Birkhin地块超镁铁质岩石和各种辉长岩的化学和矿物成分的新数据。辉长岩中首次发现并研究了斑岩斑晶和斜辉石的分区晶粒，这使得重建从超镁铁质到辉长岩共生体的整个熔融结晶趋势成为可能。斜辉石岩和次火山长角岩也有类似的斜辉石趋势，最近在岩体及其环境中发现了其岩体和岩脉。总岩石学数据表明，镁质高钙链芳纶熔体在成分上与Birkhin地块的假定初级熔体相对应。

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Calcium-Rich Ultramafites, Ankaramites, and Clinopyroxene–Porphyric Gabbro of the Birkhin Massif in the Ol’khon Region: Solution of the Problem of Primary Melt and Formation of Intrusion

––The paper presents new data on the chemical and mineral compositions of ultramafic rocks and various gabbro of the Birkhin massif in the Ol’khon region. Porphyric phenocrysts and zoned grains of clinopyroxene have been first found and studied in gabbronorite, which made it possible to reconstruct the entire melt crystallization trend from ultramafic to gabbro parageneses. Similar clinopyroxene trends have been established for clinopyroxenites and subvolcanic ankaramites, whose bodies and dikes have been recently discovered within the massif and in its environment. The total petrological data show that the magnesian high-Ca ankaramite melt corresponds in composition to the assumed primary melt for the Birkhin massif.

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.