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DOI | 10.1038/s41561-019-0520-6 |
Earth's earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions | |
Laurent, Oscar1; Bjoernsen, Jana1; Wotzlaw, Joern-Frederik1; Bretscher, Simone1; Silva, Manuel Pimenta1; Moyen, Jean-Francois2; Ulmer, Peter1; Bachmann, Olivier1 | |
2020-01-13 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2020 |
卷号 | 13期号:2页码:163-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; France |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000519214500014 |
WOS关键词 | BARBERTON GREENSTONE-BELT ; U-PB GEOCHRONOLOGY ; MOUNTAIN LAND ; SOUTH-AFRICA ; PHASE-EQUILIBRIA ; MELT INCLUSIONS ; ISOTOPE RECORD ; ARCHEAN CRUST ; LU-HF ; TH-PB |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249391 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Swiss Fed Inst Technol, Inst Geochem & Petr, Dept Earth Sci, Zurich, Switzerland; 2.Univ Jean Monnet, Univ Lyon, CNRS, IRD,Lab Magmas & Volcans,UMR6524, St Etienne, France |
推荐引用方式 GB/T 7714 | Laurent, Oscar,Bjoernsen, Jana,Wotzlaw, Joern-Frederik,et al. Earth's earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions[J]. NATURE GEOSCIENCE,2020,13(2):163-+. |
APA | Laurent, Oscar.,Bjoernsen, Jana.,Wotzlaw, Joern-Frederik.,Bretscher, Simone.,Silva, Manuel Pimenta.,...&Bachmann, Olivier.(2020).Earth's earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions.NATURE GEOSCIENCE,13(2),163-+. |
MLA | Laurent, Oscar,et al."Earth's earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions".NATURE GEOSCIENCE 13.2(2020):163-+. |
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