Crystallization Parameters, Genesis of Melts, and Sources of Magmas of the Late Cenozoic Udokan Volcanic Plateau, Central Asia

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-03-21 DOI:10.1134/S0869591123010101
V. V. Yarmolyuk, V. M. Savatenkov, A. M. Kozlovsky, F. M. Stupak, M. V. Kuznetsov, L. V. Shpakovich
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Abstract

Similar to the other areas of the Late Cenozoic volcanic province of Central Asia, the Udokan volcanic plateau (UVP) was formed in the time span between the Middle Miocene and the Pleistocene. Its rocks are highly alkaline and vary from alkaline picrobasalts and basanites to alkaline trachytes. The compositional variations of the rocks were controlled by two differentiation trends, which corresponded to different generation conditions of the parental magmas. The rocks with low SiO2 contents (<45 wt %) were formed by melts of low degrees of melting, whose melts were derived under elevated pressures and temperatures. The formation of the rocks with 45–61 wt % SiO2 was associated with the differentiation of basalt melts, which were derived at shallower depths and at lower temperatures. The geochemical characteristics of the UVP basaltoids make them similar to OIB-type basalts. They are also close in Sr, Nd, and Pb isotopic composition, corresponding to the parameters of the moderately depleted mantle, which is close to the composition of oceanic basalt sources corresponding to the mantle of deep mantle plumes. The corresponding mantle component is present in the sources of other volcanic regions of the Late Cenozoic intraplate volcanic province in Central Asia, which indicates that the material of a lower mantle plume was involved in the formation of these regions.

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中亚晚新生代乌多坎火山高原结晶参数、熔体成因及岩浆来源
与中亚晚新生代火山省的其他地区相似,乌多坎火山高原形成于中中新世至更新世之间。其岩石呈高碱性,从碱性微玄武岩和玄武岩到碱性粗叶岩不一而足。岩石成分的变化受两种分异趋势的控制,这两种分异趋势对应于母岩浆的不同生成条件。低SiO2含量(45 wt %)的岩石是由低熔融程度的熔体形成的,这些熔体是在高压和高温下形成的。SiO2含量为45 ~ 61 wt %的岩石的形成与玄武岩熔体的分异有关,这些熔体来源于较浅的深度和较低的温度。UVP玄武岩的地球化学特征与obb型玄武岩相似。Sr、Nd、Pb同位素组成接近,与中贫地幔参数相对应,与深部地幔柱相对应的洋玄武岩源组成接近。中亚晚新生代板内火山省其它火山岩源区中均存在相应的地幔成分,表明这些地区的形成中有下地幔柱物质参与。
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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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