2010-06
AUTHORSBin Fu, John W. Valley, Noriko T. Kita, Michael J. Spicuzza, Chad Paton, Tatsuki Tsujimori, Michael Bröcker, George E. Harlow
ABSTRACTJadeitites form from hydrothermal fluids during high pressure metamorphism in subduction environments; however, the origin of zircons in jadeitite is uncertain. We report ion microprobe analyses of δ18O and Ti in zircons, and bulk δ18O data for the jadeitite whole-rock from four terranes: Osayama serpentinite mélange, Japan; Syros mélange, Greece; the Motagua Fault zone, Guatemala; and the Franciscan Complex, California. In the Osayama jadeitite, two texturally contrasting groups of zircons are identified by cathodoluminescence and are distinct in δ18O: featureless or weakly zoned zircons with δ18O = 3.8 ± 0.6‰ (2 SD, VSMOW), and zircons with oscillatory or patchy zoning with higher δ18O = 5.0 ± 0.4‰. Zircons in phengite jadeitite from Guatemala and a jadeitite block from Syros have similar δ18O values to the latter from Osayama: Guatemala zircons are 4.8 ± 0.7‰, and the Syros zircons are 5.2 ± 0.5‰ in jadeitite and 5.2 ± 0.4‰ in associated omphacitite, glaucophanite and chlorite-actinolite rinds. The δ18O values for most zircons above fall within the range measured by ion microprobe in igneous zircons from oxide gabbros and plagiogranites in modern ocean crust (5.3 ± 0.8‰) and measured in bulk by laser fluorination of zircons in equilibrium with primitive magma compositions or the mantle (5.3 ± 0.6‰). Titanium concentrations in these zircons vary between 1 and 19 ppm, within the range for igneous zircons worldwide. Values of δ18O (whole-rock) ≅ δ18O (jadeite) and vary from 6.3 to 10.1‰ in jadeitites in all four areas. These values of δ18O and Ti are higher than predicted for hydrothermal zircons, and the δ18O values of most zircons are not equilibrated with the coexisting jadeite at reasonable metamorphic temperatures. We conclude that while some zircons may be hydrothermal in origin, a majority of the zircons studied are best explained as relic igneous crystals inherited from precursor rocks; they were not precipitated directly from hot aqueous fluids as previously assumed. Therefore, U–Pb ages from these zircons may date magmatic crystallization and do not establish the timing of high pressure metamorphism or hydrothermal activity. More... »
PAGES769-780
http://scigraph.springernature.com/pub.10.1007/s00410-009-0453-y
DOIhttp://dx.doi.org/10.1007/s00410-009-0453-y
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"description": "Jadeitites form from hydrothermal fluids during high pressure metamorphism in subduction environments; however, the origin of zircons in jadeitite is uncertain. We report ion microprobe analyses of \u03b418O and Ti in zircons, and bulk \u03b418O data for the jadeitite whole-rock from four terranes: Osayama serpentinite m\u00e9lange, Japan; Syros m\u00e9lange, Greece; the Motagua Fault zone, Guatemala; and the Franciscan Complex, California. In the Osayama jadeitite, two texturally contrasting groups of zircons are identified by cathodoluminescence and are distinct in \u03b418O: featureless or weakly zoned zircons with \u03b418O = 3.8 \u00b1 0.6\u2030 (2 SD, VSMOW), and zircons with oscillatory or patchy zoning with higher \u03b418O = 5.0 \u00b1 0.4\u2030. Zircons in phengite jadeitite from Guatemala and a jadeitite block from Syros have similar \u03b418O values to the latter from Osayama: Guatemala zircons are 4.8 \u00b1 0.7\u2030, and the Syros zircons are 5.2 \u00b1 0.5\u2030 in jadeitite and 5.2 \u00b1 0.4\u2030 in associated omphacitite, glaucophanite and chlorite-actinolite rinds. The \u03b418O values for most zircons above fall within the range measured by ion microprobe in igneous zircons from oxide gabbros and plagiogranites in modern ocean crust (5.3 \u00b1 0.8\u2030) and measured in bulk by laser fluorination of zircons in equilibrium with primitive magma compositions or the mantle (5.3 \u00b1 0.6\u2030). Titanium concentrations in these zircons vary between 1 and 19 ppm, within the range for igneous zircons worldwide. Values of \u03b418O (whole-rock) \u2245 \u03b418O (jadeite) and vary from 6.3 to 10.1\u2030 in jadeitites in all four areas. These values of \u03b418O and Ti are higher than predicted for hydrothermal zircons, and the \u03b418O values of most zircons are not equilibrated with the coexisting jadeite at reasonable metamorphic temperatures. We conclude that while some zircons may be hydrothermal in origin, a majority of the zircons studied are best explained as relic igneous crystals inherited from precursor rocks; they were not precipitated directly from hot aqueous fluids as previously assumed. Therefore, U\u2013Pb ages from these zircons may date magmatic crystallization and do not establish the timing of high pressure metamorphism or hydrothermal activity.",
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"name": "readcube_id",
"type": "PropertyValue",
"value": [
"06a16006a108e6d03c0b945292801edf2e7db4bf9d1dcecb6939488d49f466c5"
]
},
{
"name": "doi",
"type": "PropertyValue",
"value": [
"10.1007/s00410-009-0453-y"
]
},
{
"name": "dimensions_id",
"type": "PropertyValue",
"value": [
"pub.1001392070"
]
}
],
"sameAs": [
"https://doi.org/10.1007/s00410-009-0453-y",
"https://app.dimensions.ai/details/publication/pub.1001392070"
],
"sdDataset": "articles",
"sdDatePublished": "2019-04-11T14:26",
"sdLicense": "https://scigraph.springernature.com/explorer/license/",
"sdPublisher": {
"name": "Springer Nature - SN SciGraph project",
"type": "Organization"
},
"sdSource": "s3://com-uberresearch-data-dimensions-target-20181106-alternative/cleanup/v134/2549eaecd7973599484d7c17b260dba0a4ecb94b/merge/v9/a6c9fde33151104705d4d7ff012ea9563521a3ce/jats-lookup/v90/0000000373_0000000373/records_13071_00000000.jsonl",
"type": "ScholarlyArticle",
"url": "http://link.springer.com/10.1007/s00410-009-0453-y"
}
]Download the RDF metadata as: json-ld nt turtle xml License info
JSON-LD is a popular format for linked data which is fully compatible with JSON.
curl -H 'Accept: application/ld+json' 'https://scigraph.springernature.com/pub.10.1007/s00410-009-0453-y'
N-Triples is a line-based linked data format ideal for batch operations.
curl -H 'Accept: application/n-triples' 'https://scigraph.springernature.com/pub.10.1007/s00410-009-0453-y'
Turtle is a human-readable linked data format.
curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1007/s00410-009-0453-y'
RDF/XML is a standard XML format for linked data.
curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1007/s00410-009-0453-y'
This table displays all metadata directly associated to this object as RDF triples.
264 TRIPLES
21 PREDICATES
66 URIs
19 LITERALS
7 BLANK NODES