DOI: 10.1016/j.epsl.2019.116041
论文题名: Do carbonatites and alkaline rocks reflect variable redox conditions in their upper mantle source?
作者: Braunger S. ; Marks M.A.W. ; Wenzel T. ; Chmyz L. ; Guitarrari Azzone R. ; Markl G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533 语种: 英语
中文关键词: alkaline silicate rocks
; carbonatites
; mantle
; oxygen fugacity
; redox conditions
英文关键词: Magnetite
; Silicate minerals
; Carbonatites
; mantle
; Oxygen fugacity
; Redox condition
; Silicate rocks
; Rocks
; alkaline rock
; carbonatite
; fugacity
; igneous geochemistry
; mantle source
; oxygen isotope
; redox conditions
; upper mantle
; Arkansas
; Baden-Wurttemberg
; Brazil
; Canada
; Finland
; Germany
; Jacupiranga
; Kaiserstuhl
; Kovdor
; Lappi [Finland]
; Magnet Cove
; Murmansk [Russian Federation]
; Oka Complex
; Quebec [Canada]
; Russian Federation
; Sokli
; South Africa
; United States
英文摘要: A detailed investigation on seven carbonatites and associated alkaline rock complexes (Kaiserstuhl, Sokli, Kovdor, Palabora, Oka, Magnet Cove, Jacupiranga), together with a world-wide comparison between carbonatites, alkaline silicate rocks and mantle xenoliths, implies peculiar redox conditions for carbonatite-bearing alkaline complexes: Carbonatites and associated alkaline rocks in continental settings crystallize from relatively oxidized magmas, on average 1.4 log units ([Formula presented]) and 1.3 log units ([Formula presented]) above the synthetic fayalite-magnetite-quartz (FMQ) buffer. In contrast, alkaline rocks in continental settings that lack associated carbonatites reveal rather reduced conditions (mean [Formula presented]; [Formula presented]). The calculated redox conditions for carbonatites and associated silicate rocks demonstrate that these crystallize from relatively oxidized mantle-derived melts compared to the general range found for alkaline rocks in continental settings. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164886
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, Eberhard-Karls-Universität Tübingen, Wilhelmstrasse 56, Tübingen, 72074, Germany; Institute of Geosciences, Universidade de São Paulo, Rua do Lago 562, São Paulo, 05508-080, Brazil
Recommended Citation:
Braunger S.,Marks M.A.W.,Wenzel T.,et al. Do carbonatites and alkaline rocks reflect variable redox conditions in their upper mantle source?[J]. Earth and Planetary Science Letters,2020-01-01,533