The Ordovician chondrite from Brunflo, central Sweden, II. Secondary minerals
Identifieur interne : 001143 ( Main/Exploration ); précédent : 001142; suivant : 001144The Ordovician chondrite from Brunflo, central Sweden, II. Secondary minerals
Auteurs : Jan Olov Nyström [Suède] ; Frans E. Wickman [Suède]Source :
- Lithos [ 0024-4937 ] ; 1991.
Abstract
Brunflo is an altered H4-H5 stony meteorite that fell in calcareous mud on the continental shelf of the Iapetus Ocean about 460–470 Ma B.P. Except for relicts of chromite all the original minerals are replaced by calcite, barite, an illite-type mineral and some minor to rare phases: carbonate-fluorapatite, quartz, titanium dioxide, chalcopyrite, three different members of the cobaltite-gersdorffite series (including a phase with a composition close to CoNi(AsS)2), rammelsbergite, safflorite, nickeline, maucherite, orcelite, native nickel, “anomalous bornite”, galena, pyrite, sphalerite and two Cu-phases (Cu1.66S and Cu4FeS4). The secondary mineralogy varies rapidly at a mm-scale, indicating non-equilibrium conditions during the alteration. By the time the mud was cemented to limestone most of the original minerals might have been transformed to secondary phases. During subsequent stages of diagenesis the temperature remained within the 0–50°C range for millions of years, probably explaining the formation of the phases of unusual compositions. A temperature rise to 200–300°C chiefly due to regional heating during the Caledonian orogeny in Silurian-Devonian time might have modified the secondary mineralogy.
Url:
DOI: 10.1016/0024-4937(91)90011-9
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000C69
- to stream Istex, to step Curation: 000876
- to stream Istex, to step Checkpoint: 000A29
- to stream Main, to step Merge: 001207
- to stream Main, to step Curation: 001143
Le document en format XML
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Secondary minerals</title><author><name sortKey="Nystrom, Jan Olov" sort="Nystrom, Jan Olov" uniqKey="Nystrom J" first="Jan Olov" last="Nyström">Jan Olov Nyström</name><affiliation wicri:level="1"><country xml:lang="fr">Suède</country><wicri:regionArea>Swedish Museum of Natural History, S-10405 Stockholm</wicri:regionArea><wicri:noRegion>S-10405 Stockholm</wicri:noRegion></affiliation></author><author><name sortKey="Wickman, Frans E" sort="Wickman, Frans E" uniqKey="Wickman F" first="Frans E." last="Wickman">Frans E. Wickman</name><affiliation wicri:level="4"><country xml:lang="fr">Suède</country><wicri:regionArea>Department of Geology and Geochemistry, Stockholm University, S-10691 Stockholm</wicri:regionArea><orgName type="university">Université de Stockholm</orgName><placeName><settlement type="city">Stockholm</settlement><region nuts="1">Svealand</region><region nuts="1">Comté de Stockholm</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Lithos</title><title level="j" type="abbrev">LITHOS</title><idno type="ISSN">0024-4937</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991">1991</date><biblScope unit="volume">27</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="167">167</biblScope><biblScope unit="page" to="185">185</biblScope></imprint><idno type="ISSN">0024-4937</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0024-4937</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Brunflo is an altered H4-H5 stony meteorite that fell in calcareous mud on the continental shelf of the Iapetus Ocean about 460–470 Ma B.P. Except for relicts of chromite all the original minerals are replaced by calcite, barite, an illite-type mineral and some minor to rare phases: carbonate-fluorapatite, quartz, titanium dioxide, chalcopyrite, three different members of the cobaltite-gersdorffite series (including a phase with a composition close to CoNi(AsS)2), rammelsbergite, safflorite, nickeline, maucherite, orcelite, native nickel, “anomalous bornite”, galena, pyrite, sphalerite and two Cu-phases (Cu1.66S and Cu4FeS4). The secondary mineralogy varies rapidly at a mm-scale, indicating non-equilibrium conditions during the alteration. By the time the mud was cemented to limestone most of the original minerals might have been transformed to secondary phases. During subsequent stages of diagenesis the temperature remained within the 0–50°C range for millions of years, probably explaining the formation of the phases of unusual compositions. A temperature rise to 200–300°C chiefly due to regional heating during the Caledonian orogeny in Silurian-Devonian time might have modified the secondary mineralogy.</div></front></TEI><affiliations><list><country><li>Suède</li></country><region><li>Comté de Stockholm</li><li>Svealand</li></region><settlement><li>Stockholm</li></settlement><orgName><li>Université de Stockholm</li></orgName></list><tree><country name="Suède"><noRegion><name sortKey="Nystrom, Jan Olov" sort="Nystrom, Jan Olov" uniqKey="Nystrom J" first="Jan Olov" last="Nyström">Jan Olov Nyström</name></noRegion><name sortKey="Wickman, Frans E" sort="Wickman, Frans E" uniqKey="Wickman F" first="Frans E." last="Wickman">Frans E. Wickman</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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