The possible role of organic matter in transport and accumulation of metals exemplified at the Permian Kupferschiefer formation
Identifieur interne : 001141 ( Main/Exploration ); précédent : 001140; suivant : 001142The possible role of organic matter in transport and accumulation of metals exemplified at the Permian Kupferschiefer formation
Auteurs : W. Püttmann [Allemagne] ; W. J. J. Fermont [Pays-Bas] ; S. Speczik [Pologne]Source :
- Ore Geology Reviews [ 0169-1368 ] ; 1991.
Abstract
The Permian Kupferschiefer in the Central European Zechstein Basin has been deposited under anoxic sedimentary conditions. The shale contains on average about 5% of organic matter which is classified as kerogen Type II. In areas where an ore-grade mineralization of the Kupferschiefer is not observed (i.e. NW Germany), the organic matter follows solely a temperature-induced transformation process. Copper and silver enrichment in the Kupferschiefer is associated with the occurrence of Rote Fäule. At those places where Rote Fäule came in contact with or very close to the Kupferschiefer, secondary alteration reactions are detectable in the solvent-extracted organic matter as well as in the kerogen. This effect is pronounced in the Kupferschiefer of the Konrad mine investigated in the present study. The analysis of solvent extracts has been carried out using methods such as gas chromatography coupled to mass spectrometry (GC/MS). For the investigation of the kerogen pyrolysis experiments (“Rock-Eval”) have been undertaken.In a closely sampled Kupferschiefer profile from the Konrad mine (SW Poland), significant depletion of the organic matter and the hydrogen content of the organic matter is found in the bottom part of the section approaching the Rote Fäule horizon. The precipitation of copper from ascending oxidizing solutions occurred primarily in the inner part of the Kupferschiefer section, where sufficient hydrogen for abiotic thermochemical sulphide production was still available. Thus, the organic matter acted as a reducing barrier mediating the metal accumulation from upwards migrating metal-bearing brines (ascending brine theory). The determination of the maturity parameters indicates, that the organic matter was mature when oxidation occurred.
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DOI: 10.1016/0169-1368(91)90047-B
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Püttmann</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Lehrstuhl für Geologie, Geochemie und Lagerstätten des Erdöls und der Kohle, RWTH Aachen, Lochnerstr. 4-20, 51 Aachen</wicri:regionArea><wicri:noRegion>51 Aachen</wicri:noRegion><wicri:noRegion>51 Aachen</wicri:noRegion></affiliation></author><author><name sortKey="Fermont, W J J" sort="Fermont, W J J" uniqKey="Fermont W" first="W. J. J." last="Fermont">W. J. J. Fermont</name><affiliation wicri:level="1"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Rijks Geologische Dienst, Geologisch Bureau, Postbus 126, 6400 Heerlen</wicri:regionArea><wicri:noRegion>6400 Heerlen</wicri:noRegion></affiliation></author><author><name sortKey="Speczik, S" sort="Speczik, S" uniqKey="Speczik S" first="S." last="Speczik">S. Speczik</name><affiliation wicri:level="1"><country xml:lang="fr">Pologne</country><wicri:regionArea>Faculty of Geology, University of Warsaw, Al. Zwirki i Wigury 93, 02-089 Warsaw</wicri:regionArea><wicri:noRegion>02-089 Warsaw</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Ore Geology Reviews</title><title level="j" type="abbrev">OREGEO</title><idno type="ISSN">0169-1368</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991">1991</date><biblScope unit="volume">6</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="563">563</biblScope><biblScope unit="page" to="579">579</biblScope></imprint><idno type="ISSN">0169-1368</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0169-1368</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The Permian Kupferschiefer in the Central European Zechstein Basin has been deposited under anoxic sedimentary conditions. The shale contains on average about 5% of organic matter which is classified as kerogen Type II. In areas where an ore-grade mineralization of the Kupferschiefer is not observed (i.e. NW Germany), the organic matter follows solely a temperature-induced transformation process. Copper and silver enrichment in the Kupferschiefer is associated with the occurrence of Rote Fäule. At those places where Rote Fäule came in contact with or very close to the Kupferschiefer, secondary alteration reactions are detectable in the solvent-extracted organic matter as well as in the kerogen. This effect is pronounced in the Kupferschiefer of the Konrad mine investigated in the present study. The analysis of solvent extracts has been carried out using methods such as gas chromatography coupled to mass spectrometry (GC/MS). For the investigation of the kerogen pyrolysis experiments (“Rock-Eval”) have been undertaken.In a closely sampled Kupferschiefer profile from the Konrad mine (SW Poland), significant depletion of the organic matter and the hydrogen content of the organic matter is found in the bottom part of the section approaching the Rote Fäule horizon. The precipitation of copper from ascending oxidizing solutions occurred primarily in the inner part of the Kupferschiefer section, where sufficient hydrogen for abiotic thermochemical sulphide production was still available. Thus, the organic matter acted as a reducing barrier mediating the metal accumulation from upwards migrating metal-bearing brines (ascending brine theory). The determination of the maturity parameters indicates, that the organic matter was mature when oxidation occurred.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Pays-Bas</li><li>Pologne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Puttmann, W" sort="Puttmann, W" uniqKey="Puttmann W" first="W." last="Püttmann">W. Püttmann</name></noRegion></country><country name="Pays-Bas"><noRegion><name sortKey="Fermont, W J J" sort="Fermont, W J J" uniqKey="Fermont W" first="W. J. J." last="Fermont">W. J. J. Fermont</name></noRegion></country><country name="Pologne"><noRegion><name sortKey="Speczik, S" sort="Speczik, S" uniqKey="Speczik S" first="S." last="Speczik">S. Speczik</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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