Unaltered cosmic spherules in a 1.4-Gyr-old sandstone from Finland

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doi: 10.1038/25943
Authors:Deutsch, Alexander; Greshake, Ansgar; Pesonen, Lauri J.; Pihlaja, Pekka
Author Affiliations:Primary:
Universität Münster, Institut für Planetologie, Munster, Federal Republic of Germany
Geological Survey of Finland, Finland
Volume Title:Nature (London)
Source:Nature (London), 395(6698), p.146-148. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1998
Note:In English. 30 refs.; illus., incl. 3 tables
Summary:Opaque cosmic spherules (< 5 µm) from a purplish-red arkose from the Satakunta sedimentary rocks, Murronmäki, SW Finland, are 'melted micrometeorites' of porphyritic or fine-grained barred-olivine types. The spherules consist of olivine and spinel set in a SiO2-Fe glassy matrix. Analyses are presented of the bulk spherule composition, olivines, spinel and matrix. Despite their long residence in these rocks, the micrometeorites show features similar to those of micrometeorites deposited in the Quaternary elsewhere. If these fossil micrometeorites are restricted to specific horizons in red beds (∼ 1400 m.y. red beds occur widely in the Northern Hemisphere), then they may be a valuable marker horizon in the absence of fossils. [R.K.H.]
Sections:Meteorites and tektites
Subjects:Chemical composition; Clastic rocks; Cosmic dust; Electron probe data; Mesoproterozoic; Meteorites; Micrometeorites; Nesosilicates; New data; Olivine; Olivine group; Orthosilicates; Oxides; Oxygen; Paleoatmosphere; Precambrian; Proterozoic; Red beds; Sandstone; Sedimentary rocks; Silicates; Spherules; Spinel; Stony meteorites; Textures; Upper Precambrian; Europe; Finland; Scandinavia; Western Europe; Satakunta Sandstone
Abstract Numbers:99M/1918
Record ID:1998060431
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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