DOI: 10.1038/s41561-019-0520-6
论文题名: Earth’s earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions
作者: Laurent O. ; Björnsen J. ; Wotzlaw J.-F. ; Bretscher S. ; Pimenta Silva M. ; Moyen J.-F. ; Ulmer P. ; Bachmann O.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 2 起始页码: 163
结束页码: 169
语种: 英语
英文关键词: complementarity
; crystallization
; geochemistry
; granitoid
; magma chamber
; Phanerozoic
; plagioclase
; volcanic rock
; South Africa
英文摘要: Granitoids of the tonalite–trondhjemite–granodiorite (TTG) series dominate Earth’s earliest continental crust. The geochemical diversity of TTGs is ascribed to several possible geodynamic settings of magma formation, from low-pressure differentiation of oceanic plateaus to high-pressure melting of mafic crust at convergent plate margins. These interpretations implicitly assume that the bulk-rock compositions of TTGs did not change from magma generation in the source to complete crystallization. However, crystal–liquid segregation influences the geochemistry of felsic magmas, as shown by the textural and chemical complementarity between coeval plutons and silicic volcanic rocks in the Phanerozoic Eon. We demonstrate here that Paleoarchean (ca. 3,456 million years old) TTG plutons from South Africa do not represent liquids but fossil, crystal-rich magma reservoirs left behind by the eruption of silicic volcanic rocks, being possibly coeval at the million-year scale as constrained by high-precision uranium–lead geochronology. The chemical signature of the dominant trondhjemites, conventionally interpreted as melts generated by high-pressure melting of basalts, reflects the combined accumulation of plagioclase phenocrysts and loss of interstitial liquid that erupted as silicic volcanic rocks. Our results indicate that the entire compositional diversity of TTGs could derive from the upper crustal differentiation of a single, tonalitic magma formed by basalt melting and/or crystallization at <40 km depth. These results call for a unifying model of Hadean–Archean continent nucleation by intracrustal production of TTG magmas. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169634
Appears in Collections: 气候变化与战略
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作者单位: ETH Zürich, Department of Earth Sciences, Institute for Geochemistry and Petrology, Zürich, Switzerland; Université de Lyon, Université Jean Monnet, Laboratoire Magmas et Volcans (UMR6524-CNRS-IRD), Saint-Étienne, France
Recommended Citation:
Laurent O.,Björnsen J.,Wotzlaw J.-F.,et al. Earth’s earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions[J]. Nature Geoscience,2020-01-01,13(2)