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  • 1
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    Constraints on the pre-eruptive magmatic history of the Quaternary Laacher See volcano (Germany) (2020)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2023-06-21
    Description: Ba zonation patterns in sanidine phenocrysts from mafic and intermediate phonolite and crystal-rich cumulates from the Laacher See volcano (12.9 ka) in western Germany document diffusion times suggestive of periodic recharge events throughout the magma reservoir’s entire lifespan of ~ 24 ky. Phenocrysts analysed from samples that formed late at the base of the compositionally zoned magma reservoir by mixing and mingling between a resident phonolite magma and recharging basanite show resorption and thin (2–10 μm) late-stage Ba-rich overgrowth. Short diffusion profiles across these boundaries give diffusion times of ~ 1.5–3 years at most, which are interpreted to be the maximum duration between the most recent recharge by the basanite and eruption. The lack of such late overgrowth in samples from other parts of the phonolite reservoir suggests that effect of this mixing and mingling was limited to the crystal-rich base. Sanidines in the cumulates, by contrast, are generally devoid of zoned crystals. Only rare cumulate crystals with resorbed outer boundaries and very thin overgrowths (a few microns) with very sharp compositional changes imply the remobilization of cumulates only months before eruption. Based on the diffusion timescales and storage temperatures obtained in a previous study, we present a genetic model for the conditions and timing of storage and (re-)activation of the magma system prior to the eruption of Laacher See, which is the largest volcanic event in Central Europe since the last glaciation.
    Description: Deutscher Akademischer Austauschdienst http://dx.doi.org/10.13039/501100001655
    Keywords: ddc:551.9 ; Laacher see ; Diffusion chronometry ; Barium ; BSE images ; Magma storage
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Geochemical compositions of igneous rocks of the Central Andean orocline (2021)
    GRO.data
    Details
    Publication Date: 2024-02-02
    Description: Abstract
    Description: Compilation of more than 1500 major- and trace-element data points, and 650 Sr-, 610 Nd-, and 570 Pb-isotopic analyses of Mesozoic-Cenozoic (190–0 Ma) magmatic rocks in southern Peru, northern Chile and Bolivia (Central Andean orocline). This compilation was initially published by Mamani et al. (2010) and was based on selected data published up until 2009, combined with new data from that study. Related key publication: Mamani, M., Wörner, G., & Sempere, T. (2010). Geochemical variations in igneous rocks of the Central Andean orocline (13°S to 18°S): Tracing crustal thickening and magma generation through time and space. GSA Bulletin, 122(1–2), 162–182. https://doi.org/10.1130/B26538.1
    Description: Other
    Description: The DIGIS geochemical data repository is a research data repository in the Earth Sciences domain with a specific focus on geochemical data. It is hosted at GFZ Data Services through a collaboration between the Digital Geochemical Data Infrastructure (DIGIS) for GEOROC 2.0 (https://digis.geo.uni-goettingen.de) and the GFZ German Research Centre for Geosciences. The repository archives, publishes and makes accessible user-contributed, peer-reviewed research data that fall within the scope of the GEOROC database. Compilations of previously published data are also made available on the GEOROC website (https://georoc.eu) as Expert Datasets.
    Keywords: major elements ; trace elements ; Mesozoic ; Cenozoic ; lava ; ignimbrite ; ash ; intrusion ; metamorphic ; dike ; Peru ; Chile ; Bolivia ; Argentina ; andesite ; amphibolite ; basalt ; basaltic andesite ; dacite ; diorite ; gabbro ; gneiss ; granite ; granodiorite ; granulite ; latite ; monzodiorite ; monzonite ; quartzite ; rhyodacite ; rhyolite ; scoria ; serpentinite ; shoshonite ; tonalite ; trachyandesite ; trachybasalt ; magmatic ; Sr87_Sr86 ; Nd143_Nd144 ; Pb206_Pb204 ; Pb207_Pb204 ; Pb208_Pb204 ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOCHEMISTRY ; Phanerozoic 〉 Cenozoic 〉 Neogene ; Phanerozoic 〉 Cenozoic 〉 Neogene 〉 Miocene ; Phanerozoic 〉 Cenozoic 〉 Neogene 〉 Pliocene ; Phanerozoic 〉 Cenozoic 〉 Paleogene ; Phanerozoic 〉 Cenozoic 〉 Paleogene 〉 Eocene ; Phanerozoic 〉 Cenozoic 〉 Paleogene 〉 Oligocene ; Phanerozoic 〉 Cenozoic 〉 Paleogene 〉 Paleocene ; Phanerozoic 〉 Cenozoic 〉 Quaternary 〉 Pleistocene ; Phanerozoic 〉 Mesozoic 〉 Cretaceous ; Phanerozoic 〉 Mesozoic 〉 Jurassic ; Phanerozoic 〉 Paleozoic ; Phanerozoic 〉 Paleozoic 〉 Carboniferous ; Phanerozoic 〉 Paleozoic 〉 Devonian ; Phanerozoic 〉 Paleozoic 〉 Ordovician ; Phanerozoic 〉 Paleozoic 〉 Permian ; Precambrian 〉 Proterozoic
    Type: Dataset , Dataset
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    DATA GFZ
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