Age and Origin of the Subalkaline Magmatic Series of the Khibiny–Lovozero Complex

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-05-27 DOI:10.1134/S0869591124700024
A. A. Arzamastsev, A. A. Ivanova, E. B. Salnikova, A. B. Kotov, V. P. Kovach, M. V. Stifeeva, N. Yu. Zagornaya, Yu. V. Plotkina, E. V. Tolmacheva
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Abstract

The paper presents data on the miaskite syenites of the Lovozero massif, pulaskites of the Khibiny massif, rocks of the larvikite–lardalite series of the Kurga massif, and subalkaline volcanics, which are preserved as remnants in the roof of the massifs. The studied rocks are characterized by a low agpaitic coefficient of <1, the absence of minerals typical of peralkaline rocks (eudialyte, aenigmatite, etc.), and the presence of zircon. The morphological features and chemical composition of zircon from miaskite of the Lovozero massif syenite indicate that the mineral is of magmatic nature. The crystallization age of the miaskites was dated on zircon at 373 ± 5 Мa. The isotope-geochemical characteristics of rocks of the subalkaline series indicate that the miaskites of the Lovozero massif are of mantle origin, show no indications of their crustal contamination, and were produced during the evolution of ankaramite melt. The pulaskites of the Khibiny massif were formed according to an analogous scenario, except their assimilation with crustal material, whose proportion did not exceed, according to model calculations, 10%.

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奇宾尼-洛沃泽罗复合体亚碱性岩浆系列的年龄和起源
摘要 本文介绍了有关洛沃泽罗山丘的miaskite正长岩、基比尼山丘的pulaskite、库尔加山丘的拉长岩-钠长岩系列岩石以及山顶残留的亚碱性火山岩的数据。所研究的岩石的特点是躁石系数低(1),不含典型的围碱性岩石矿物(乌云母、辉绿岩等),但含有锆石。从洛沃泽罗丘陵正长岩的miaskite中提取的锆石的形态特征和化学成分表明,该矿物具有岩浆性质。锆石的结晶年代为 373 ± 5 Мa。亚碱性系列岩石的同位素地球化学特征表明,洛沃泽罗地块的miaskites源于地幔,没有地壳污染的迹象,是在安卡拉岩熔体演化过程中产生的。基比尼山丘的浆绢云母也是按照类似的情况形成的,只是与地壳物质同化,根据模型计算,其比例不超过 10%。
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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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