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  Biologically mediated crystallization of buddingtonite in the Paleoproterozoic: Organic-igneous interactions from the Volyn pegmatite, Ukraine

Franz, G., Khomenko, V., Vishnyevskyy, A., Wirth, R., Struck, U., Nissen, J., Gernert, U., Rocholl, A. (2017): Biologically mediated crystallization of buddingtonite in the Paleoproterozoic: Organic-igneous interactions from the Volyn pegmatite, Ukraine. - American Mineralogist, 102, 10, 2119-2135.
https://doi.org/10.2138/am-2017-6055

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Franz, Gerhard1, Autor
Khomenko, Vladimir1, Autor
Vishnyevskyy, Aleksei1, Autor
Wirth, R.2, Autor              
Struck, Ulrich1, Autor
Nissen, Jörg1, Autor
Gernert, Ulrich1, Autor
Rocholl, A.3, Autor              
GFZ SIMS Publications, Deutsches GeoForschungsZentrum, Autor              
Affiliations:
1External Organizations, ou_persistent22              
24.3 Chemistry and Physics of Earth Materials, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146036              
33.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

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Schlagwörter: Buddingtonite, tobelite, kerite, organic matter, Volodarsk-Volynskyi pegmatite field
 Zusammenfassung: The Volyn pegmatites from Volodarsk-Volynskyi in the Zhytomyr Oblast, NW Ukraine, are associated with granites genetically related to the Paleoproterozoic Korosten pluton. Their late-stage evolution is characterized by the formation of opal-cemented breccia. A polymineralic pseudomorph after beryl within the breccia includes bertrandite (±euclase) + F-muscovite (with tobelite component) + buddingtonite + organic matter (OM) + opal (+ traces of K-feldspar, albite, columbite, FeS2, barite, REE-minerals). Sector-zoned and platy to fibrous buddingtonite has variable (K+Na)- vs. NH4-contents (electron microprobe analyses) and some H2O or H3O+, as indicated by microscope infrared spectroscopy. We suggest that ammonium was produced by decay of OM, which is partly preserved in the pseudomorph. Energy-dispersive electron microprobe data of the OM show with increasing O–decreasing C-N-content due to degassing; the OM contains the high field strength elements Zr (≤7 at%), Y (≤3 at%), Sc (≤0.8 at%), REE (≤0.3 at%), Th (≤0.2 at%), and U (≤1.25 at%), which increase with increasing O-content. Transmission electron microscopy of the OM confirms the presence of N; Zr, Si, and O (with other HFSE) are concentrated in nanometer-sized areas and at the transition from OM to opal in nanometer-sized platy Zr-Si-O crystals. C-rich areas are amorphous but show poorly developed lattice fringes. OM is present in the pseudomorph also as brown pigmentation of opal and in pegmatitic beryl from Volyn as a component in late stage fluid inclusions, identified by C-H vibrational bands in infrared spectra. Stable isotope investigations of C and N of buddingtonite, black opal and kerite (fibrous OM known from the literature to occur in the Volyn pegmatites and interpreted as microfossils) indicate a biogenic origin of the OM. We propose that OM in the pseudomorph is condensed kerite, which achieved the high concentrations of high field strength elements via fluid-pegmatite interaction. Although no age determination of minerals in the pseudomorph is available, textural arguments and phase equilibria indicate its formation in a late stage of the pegmatite evolution, at P-T conditions below ~100 MPa/150 °C. We favor a conceptual model for the formation of the Volyn buddingtonite in analogy to Phanerozoic occurrences of buddingtonite, where over and around the shallow anorthosite-granite Korosten pluton hydrothermal convection cells introduced N-bearing hydrocarbons and its precursors into the cooling igneous rocks. Due to the elevated temperature, the OM disintegrated into degassing volatile and non-volatile residual components analogous to petroleum maturation. Organic N, released as NH4, was then incorporated into buddingtonite.

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 Datum: 2017
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.2138/am-2017-6055
URI: http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.2138/am-2017-6055
GFZPOF: p3 PT3 Earth Surface and Climate Interactions
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Titel: American Mineralogist
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 102 (10) Artikelnummer: - Start- / Endseite: 2119 - 2135 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals22