Evolution of the Magmatic Sources of the Eastern Mongolian Volcanic Area: Evidence from Geochemical and Sr–Nd–Pb Isotope Data

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2022-09-06 DOI:10.1134/S0869591122050034
M. V. Kuznetsov, V. M. Savatenkov, L. V. Shpakovich, V. V. Yarmolyuk, A. M. Kozlovsky
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引用次数: 1

Abstract

The Eastern Mongolian Volcanic Area (EMVA) is part of the Late Mesozoic–Early Cenozoic volcanic and plutonic belt in Northeastern Asia. The EMVA evolved in three stages, with volcanic rocks of different composition produced during each of the stages and with the parental melts of the rocks derived from different sources and formed by different mechanisms. The rocks of the Early Cretaceous stage (135–100 Ma), which form the volcanic flow complex of the EMVA, are predominantly differentiated alkali basaltoids. Data on isotopic features of these rocks, particularly their Pb isotope composition, allowed us to identify the nature of their sources: peridotites of the Continental Metasomatized Lithospheric Mantle (CMLM) and lower continental crustal eclogitic rocks. The alkali basaltoids of the extrusive complex of the Uldza-gol volcanic field were formed during the next evolution stage of the EMVA at 104–90 Ma. According to their geochemical and isotope features, the melts of these rocks were derived from the same sources as those of the volcanics of the previous Early Cretaceous stage, except only that eclogite material played a more significant role in forming of the Uldza-gol basaltoid melts. During the concluding stage of the EMVA evolution in the Late Cretaceous–Early Cenozoic (87–51 Ma), OIB-like rocks of the basanite–trachybasalt association were formed in the Central Gobi in the southwestern flank of the EMVA. Asthenospheric and recycled pyroxenite components, together with not so much CMLM peridotites, were involved in forming of these rocks. The various sources of the EMVA volcanic rocks reflect two mechanisms of their formation. In the Early to Late Cretaceous, magmatism was triggered by the ascent of the asthenospheric mantle and delamination of the lithospheric mantle, whereas the Early Cenozoic magmatism was induced by the activity of a mantle plume.

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东蒙古火山区岩浆源区演化:地球化学和Sr-Nd-Pb同位素资料的证据
东蒙古火山区是东北亚晚中生代-早新生代火山-深成带的一部分。EMVA的演化经历了三个阶段,每个阶段都产生了不同成分的火山岩,岩石的母熔体来自不同的来源,形成的机制也不同。早白垩世(135 ~ 100 Ma)的岩石以分异碱性玄武岩为主,构成了EMVA的火山流杂岩。这些岩石的同位素特征数据,特别是其Pb同位素组成,使我们能够确定其来源的性质:大陆交代岩石圈地幔(CMLM)的橄榄岩和下大陆地壳的榴辉岩。乌尔扎-戈尔火山田喷出杂岩的碱性玄武岩形成于EMVA的下一个演化阶段(104 ~ 90 Ma)。根据其地球化学和同位素特征,这些岩石的熔体与早白垩世早期的火山熔体来源相同,只是榴辉岩物质在Uldza-gol玄武岩熔体的形成中发挥了更大的作用。在晚白垩世-早新生代(87-51 Ma) EMVA演化的最后阶段,在EMVA西南侧翼的戈壁中部形成了玄武岩-粗质玄武岩组合的obb状岩石。软流圈成分和再循环辉石岩成分,以及不那么多的CMLM橄榄岩,参与了这些岩石的形成。EMVA火山岩的各种来源反映了两种形成机制。早-晚白垩世岩浆活动主要由软流圈地幔上升和岩石圈地幔拆沉引起,而早新生代岩浆活动主要由地幔柱活动引起。
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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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