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Sökning: WFRF:(Scherstén Anders) > Baddeleyite formati...

  • Lewerentz, AlexanderStockholm University,Lunds universitet,Stockholms universitet,Institutionen för geologiska vetenskaper,Lund University, Sweden; GeoForschungs Zentrum, Potsdam, Germany; Geological Survey of Sweden,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science,GFZ German Research Centre for Geosciences (författare)

Baddeleyite formation in zircon by Ca-bearing fluids in silica-saturated systems in nature and experiment : resetting of the U-Pb geochronometer

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • 2019-07-22
  • Springer Science and Business Media LLC,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:su-171701
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-171701URI
  • https://doi.org/10.1007/s00410-019-1600-8DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-3525URI
  • https://lup.lub.lu.se/record/33b678ca-9cc4-4bd7-a3e2-911c50e9dbe9URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Intergrowths of baddeleyite have been found in zircon grain interiors from amphibolite- and granulite-facies felsic rocks from southwest Greenland. The zircon grains are either close to or in direct contact with quartz. A series of experiments has been conducted using natural, unaltered zircon grains +/- SiO2 in H2O-CaCl2, and H2O-Ca(OH)(2) solutions with varying molar proportions of Ca to Si at 900 degrees C; 1000MPa and 600 degrees C; 400MPa for 4-50days. Experimental results indicate that baddeleyite formed in the reacted zircon if the molar amount of Ca was close to or greater than Si in the system. The baddeleyite primarily takes the form of bead-like trails along the reaction front between the altered and unaltered zircon. Uranium, Th, and Y+REE were detected in both the newly formed baddeleyite and in the altered zircon, while Pb was effectively absent in both phases. Formation of baddeleyite from zircon in the silica-saturated rocks only appears to be possible when Ca saturates the system, such that the Si is tied up as CaSiO3 lowering the silica activity to <1. This highly localized (mu m to nm scale) effect in natural quartz-bearing rocks, where baddeleyite forms in the interiors of zircon grains in contact with quartz, implies that metastability in natural rock-forming systems can occur on a very small scale. Non-incorporation of Pb in the newly formed baddeleyite, or in areas of the zircon altered by fluids, implies that either could be used to date the metasomatic event responsible for their formation.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Harlov, Daniel E.University of Johannesburg (författare)
  • Scherstén, AndersLund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science(Swepub:lu)geol-aes (författare)
  • Whitehouse, Martin J.,1962-Swedish Museum of Natural History,Naturhistoriska riksmuseet,Enheten för geovetenskap,Nordsim(Swepub:nrm)martwhit (författare)
  • Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Contributions to Mineralogy and Petrology: Springer Science and Business Media LLC174:80010-79991432-0967

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