Skip to Main Content
GEOREF RECORD

Cathodoluminescence and LA-ICP-MS chemistry of silicified wood enclosing wakefieldite; REEs and V migration during complex diagenetic evolution

Petra Matysova, Jens Goetze, Jaromir Leichmann, Radek Skoda, Ladislav Strnad, Petr Drahota and Tomas Matys Grygar
Cathodoluminescence and LA-ICP-MS chemistry of silicified wood enclosing wakefieldite; REEs and V migration during complex diagenetic evolution
European Journal of Mineralogy (June 2016) 28 (5): 869-887

Abstract

Silicified Agathoxylon-type wood of Late Palaeozoic age was characterized by means of cathodoluminescence (CL) and LA-ICP-MS of the quartz mass, which was found to contain wakefieldite, characterized by electron-microprobe (EMP) analysis, Raman microspectroscopy and X-ray diffraction. Although former organic matter is almost absent, plant anatomy served as the template for the quartz mass texture. Two generations of quartz mass were distinguished; the large proportion of the silicified wood consisting of brownish alpha -quartz with a dark reddish CL emission, and the minor portion of whitish 'leached' wood with a short-lived (transient) blue CL. On the outer edge, a silicified texture of formerly slightly humified wood also emits a dark reddish CL. Likely the wood specimen has been fossilized and diagenetically altered in several steps. The marginal part had been humified (reductively degraded) before the initial stages of silicification. The LA-ICP-MS analyses revealed chemical differences in all three distinct parts. The quartz mass relatively enriched in REEs and As and giving the dark reddish CL is interpreted as a primary diagenetic mineral mass. Whitish zones relatively depleted in U and V, and enriched in Al, Li, Rb, Cu, and Sr producing the blue CL would then be a secondary diagenetic overprint. An EMP/WDS analysis identified As-rich xenotime-(Y) and a solid solution of wakefieldite-(Ce) and wakefieldite-(Y), which locally enclose individual silicified tracheids. Wakefieldite, identified in silicified plant tissue for the first time, was most likely formed as a secondary mineral during post-depositional diagenesis. The mineral diagenesis did not erase the original anatomy of the wood.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 28
Serial Issue: 5
Title: Cathodoluminescence and LA-ICP-MS chemistry of silicified wood enclosing wakefieldite; REEs and V migration during complex diagenetic evolution
Affiliation: Czech Academy of Sciences, Institute of Rock Structure and Mechanics, Prague, Czech Republic
Pages: 869-887
Published: 20160608
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 74
Accession Number: 2016-085303
Categories: Mineralogy of non-silicatesGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N50°33'19" - N50°33'19", E15°33'27" - E15°33'27"
Secondary Affiliation: Technische Universitaet Bergakademie Freiberg, DEU, GermanyMasaryk University, CZE, Czech RepublicCharles University, CZE, Czech RepublicCzech Academy of Sciences, Institute of Inorganic Chemistry, CZE, Czech Republic
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201641
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal