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

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Fältnamn	Indikatorer	Metadata
000		05093naa a2200601 4500
001		oai:DiVA.org:su-171701
003		SwePub
008		190819s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
009		oai:DiVA.org:nrm-3525
009		oai:lup.lub.lu.se:33b678ca-9cc4-4bd7-a3e2-911c50e9dbe9
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1717012 URI
024	7	a https://doi.org/10.1007/s00410-019-1600-82 DOI
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-35252 URI
024	7	a https://lup.lub.lu.se/record/33b678ca-9cc4-4bd7-a3e2-911c50e9dbe92 URI
040		a (SwePub)sud (SwePub)nrmd (SwePub)lu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Lewerentz, Alexanderu Stockholm 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 Geosciences4 aut0 (Swepub:lu)al3624le
245	1 0	a Baddeleyite formation in zircon by Ca-bearing fluids in silica-saturated systems in nature and experiment :b resetting of the U-Pb geochronometer
264		c 2019-07-22
264	1	b Springer Science and Business Media LLC,c 2019
338		a print2 rdacarrier
520		a 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.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geologi0 (SwePub)105042 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geology0 (SwePub)105042 hsv//eng
653		a Zircon
653		a Baddeleyite
653		a U-Pb geochronology
653		a Fluid alteration
653		a Experimental petrology
653		a The changing Earth
653		a Baddeleyite
653		a Experimental petrology
653		a Fluid alteration
653		a U–Pb geochronology
653		a Zircon
700	1	a Harlov, Daniel E.u University of Johannesburg4 aut
700	1	a Scherstén, Andersu Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science4 aut0 (Swepub:lu)geol-aes
700	1	a Whitehouse, Martin J.,d 1962-u Swedish Museum of Natural History,Naturhistoriska riksmuseet,Enheten för geovetenskap,Nordsim4 aut0 (Swepub:nrm)martwhit
710	2	a Stockholms universitetb Institutionen för geologiska vetenskaper4 org
773	0	t Contributions to Mineralogy and Petrologyd : Springer Science and Business Media LLCg 174:8q 174:8x 0010-7999x 1432-0967
856	4	u https://doi.org/10.1007/s00410-019-1600-8
856	4	u http://dx.doi.org/10.1007/s00410-019-1600-8y FULLTEXT
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-171701
856	4 8	u https://doi.org/10.1007/s00410-019-1600-8
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-3525
856	4 8	u https://lup.lub.lu.se/record/33b678ca-9cc4-4bd7-a3e2-911c50e9dbe9

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