| Granulite—facies Middle—Lower Crustal Xenoliths from Nueshan Alkali Basalt in Northeastern Anhui Province, China |
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| 引用本文： | 于津海,周新民.Granulite—facies Middle—Lower Crustal Xenoliths from Nueshan Alkali Basalt in Northeastern Anhui Province, China[J].中国地球化学学报,1993,12(4):339-352. |
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| 作者姓名： | 于津海 周新民 |
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| 作者单位： | [1]DepartmentofEarthSciences,NanjingUniversity,Nanjing210008 [2]DepartmentofEarthSciences,NanjingUniversity |
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| 摘 要： | Metamorphic xenoliths within the Nushan alkali basalt of northeastern Anhui (NEA),China ,are from the middle-lower crust.They could be divided into two end-members:basic and acid.Interme-diate xenoliths are scarcely found.Basic two-pyroxene granulites(pyriclasites) were formed at 720-810℃ and 7-8kb.Petrological and geochemical studies indicate that the primary magma of the protoliths of basic granulites was derived from the metasomatized upper mantle, while the pa-rental magma of the acid end-member was probably produced by partial melting of the basic rocks. The protoliths of charnockites and grey gneisses represent respectively the early and late crystallization products of the granitic magma.The Nushan granulites are much different in many aspects from the granulites exposed in the northern part of North China ,which implies the inhomogeneity regarding to the early evolution of the North China terranc.
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| 关 键 词： | 捕虏体 碱性玄武岩 麻粒岩 安徽 地壳 |
Granulite facies middle-lower crustal xenoliths from Nushan alkali basalt in northeastern Anhui Province,China |
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| Yu Jinhai,Zhou Xinmin.Granulite facies middle-lower crustal xenoliths from Nushan alkali basalt in northeastern Anhui Province,China[J].Chinese Journal of Geochemistry,1993,12(4):339-352. |
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| Authors: | Yu Jinhai Zhou Xinmin |
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| Institution: | (1) Department of Earth Sciences, Nanjing University, 210008 Nanjing |
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| Abstract: | Metamorphic xenoliths within the Nushan alkali basalt of northeastern Anhui (NEA), China, are from the middle-lower crust.
They could be divided into two end-members: basic and acid. Intermediate xenoliths are scarcely found. Basic two-pyroxene
granulites (pyriclasites) were formed at 720–810° C and 7–8 kb. Petrological and geochemical studies indicate that the primary
magma of the protoliths of basic granulites was derived from the metasomatized upper mantle, while the parental magma of the
acid end-member was probably produced by partial melting of the basic rocks. The protoliths of charnockites and grey gneisses
represent respectively the early and late crystallization products of the granitic magma. The Nushan granulites are much different
in many aspects from the granulites exposed in the northern part of North China, which implies the inhomogeneity regarding
to the early evolution of the North China terrane. |
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| Keywords: | Xenolith alkali basalt granulite facies Nüshan Anhui Province |
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