DOI: 10.1007/s00531-015-1207-x
Scopus记录号: 2-s2.0-84945455854
论文题名: Geochemical composition, petrography and 40Ar/39Ar age of the Heldburg phonolite: implications on magma mixing and mingling
作者: Abratis M. ; Viereck L. ; Pfänder J.A. ; Hentschel R.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 8 起始页码: 2033
结束页码: 2055
语种: 英语
英文关键词: 40Ar/39Ar dating
; Central European Volcanic Province
; Heldburg phonolite
; Magma mixing and mingling
; Whole rock and mineral geochemistry
Scopus关键词: argon-argon dating
; igneous geochemistry
; igneous intrusion
; magma
; mixing
; petrography
; phonolite
; Europe
英文摘要: Differentiated magmatic rocks such as trachyte and phonolite are volumetrically subordinate to mafic volcanic rocks within the Cenozoic Central European Volcanic Province (exceptions are the East Eifel and the Rhön volcanic fields). Within the volcanic field of the “Heldburg dike swarm” (Heldburger Gangschar), the phonolite of the Burgberg near Heldburg represents the only known occurrence of differentiated magmatic rocks. However, the Heldburg phonolite is famous foremost for containing mantle xenoliths (spinel lherzolite). Former studies proposing a cogenetic relationship between the phonolite and the peridotites concluded that the phonolite magma must have evolved under upper mantle conditions. Herewith, we present petrographic and geochemical evidence for magma mixing and mingling in the Heldburg phonolite melt due to the intrusion of mantle-derived basanitic magma, which is exposed today as dikes at the foot of the Heldburg Burgberg. During this process, the mantle xenoliths were introduced into the phonolite melt as they all contain rims of basanitic magma. Extensive mingling features (e.g., schlieren layers, load casts, flame structures, mafic enclaves) are developed, indicating that the basanite and the zoned phonolitic body were melts at the time of mixing. These petrographic and geochemical indications of two coeval melts of different composition are substantiated by 40Ar/39Ar dating, revealing identical ages of ca. 15 Ma. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945455854&doi=10.1007%2fs00531-015-1207-x&partnerID=40&md5=dc46ffe6386949535b8a860ed5efba70
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70238
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Burgweg 11, Jena, Germany; Geologisches Institut, Technische Universität - Bergakademie Freiberg, Bernhard-von-Cotta Str. 2, Freiberg, Germany; Kolbe-Str. 38, Erfurt, Germany
Recommended Citation:
Abratis M.,Viereck L.,Pfänder J.A.,et al. Geochemical composition, petrography and 40Ar/39Ar age of the Heldburg phonolite: implications on magma mixing and mingling[J]. International Journal of Earth Sciences,2015-01-01,104(8)