Stable oxygen isotope ratios in zircons from oceanic crust
Lower ocean crust is primarily gabbroic, although 1-2% felsic igneous rocks that are referred to collectively as plagiogranites occur locally. Recent experimental evidence suggests that plagiogranite magmas can form by hydrous partial melting of gabbro triggered by seawater-derived fluids, and thus...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.772319 2023-05-15T17:37:11+02:00 Stable oxygen isotope ratios in zircons from oceanic crust Grimes, Craig B Ushikubo, Takayuki John, Barbara E Valley, John W MEDIAN LATITUDE: 12.287116 * MEDIAN LONGITUDE: -20.442310 * SOUTH-BOUND LATITUDE: -32.724000 * WEST-BOUND LONGITUDE: -46.903610 * NORTH-BOUND LATITUDE: 30.168650 * EAST-BOUND LONGITUDE: 57.277530 * DATE/TIME START: 1987-12-06T04:45:00 * DATE/TIME END: 2003-07-01T13:00:00 2011-12-08 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.772319 https://doi.org/10.1594/PANGAEA.772319 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.772319 https://doi.org/10.1594/PANGAEA.772319 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Grimes, Craig B; Ushikubo, Takayuki; John, Barbara E; Valley, John W (2011): Uniformly mantle-like d18O in zircons from oceanic plagiogranites and gabbros. Contributions to Mineralogy and Petrology, 161(1), https://doi.org/10.1007/s00410-010-0519-x 118-735B 179-1105A 209-1270D 209-1275D 304-U1309B 304-U1309D 305-U1309D Atlantic DRILL Drilling/drill rig Exp304 Exp305 Indian Ocean Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Leg118 Leg179 Leg209 Marvel2000 MULT Multiple investigations North Atlantic Ocean Ocean Drilling Program Oceanic Core Complex Formation Atlantis Massive 1 Atlantis Massive 2 ODP South Indian Ridge South Indian Ocean Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.772319 https://doi.org/10.1007/s00410-010-0519-x 2023-01-20T07:32:21Z Lower ocean crust is primarily gabbroic, although 1-2% felsic igneous rocks that are referred to collectively as plagiogranites occur locally. Recent experimental evidence suggests that plagiogranite magmas can form by hydrous partial melting of gabbro triggered by seawater-derived fluids, and thus they may indicate early, high-temperature hydrothermal fluid circulation. To explore seawater-rock interaction prior to and during the genesis of plagiogranite and other late-stage magmas, oxygen-isotope ratios preserved in igneous zircon have been measured by ion microprobe. A total of 197 zircons from 43 plagiogranite, evolved gabbro, and hydrothermally altered fault rock samples have been analyzed. Samples originate primarily from drill core acquired during Ocean Drilling Program and Integrated Ocean Drilling Program operations near the Mid-Atlantic and Southwest Indian Ridges. With the exception of rare, distinctively luminescent rims, all zircons from ocean crust record remarkably uniform d18O with an average value of 5.2 ± 0.5 per mil (2SD). The average d18O(Zrc) would be in magmatic equilibrium with unaltered MORB [d18O(WR) ~5.6-5.7 per mil], and is consistent with the previously determined value for equilibrium with the mantle. The narrow range of measured d18O values is predicted for zircon crystallization from variable parent melt compositions and temperatures in a closed system, and provides no indication of any interactions between altered rocks or seawater and the evolved parent melts. If plagiogranite forms by hydrous partial melting, the uniform mantle-like d18O(Zrc) requires melting and zircon crystallization prior to significant amounts of water-rock interactions that alter the protolith d18O. Zircons from ocean crust have been proposed as a tectonic analog for >3.9 Ga detrital zircons from the earliest (Hadean) Earth by multiple workers. However, zircons from ocean crust are readily distinguished geochemically from zircons formed in continental crustal environments. Many of the >3.9 Ga zircons ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(-46.903610,57.277530,30.168650,-32.724000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
118-735B 179-1105A 209-1270D 209-1275D 304-U1309B 304-U1309D 305-U1309D Atlantic DRILL Drilling/drill rig Exp304 Exp305 Indian Ocean Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Leg118 Leg179 Leg209 Marvel2000 MULT Multiple investigations North Atlantic Ocean Ocean Drilling Program Oceanic Core Complex Formation Atlantis Massive 1 Atlantis Massive 2 ODP South Indian Ridge South Indian Ocean |
spellingShingle |
118-735B 179-1105A 209-1270D 209-1275D 304-U1309B 304-U1309D 305-U1309D Atlantic DRILL Drilling/drill rig Exp304 Exp305 Indian Ocean Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Leg118 Leg179 Leg209 Marvel2000 MULT Multiple investigations North Atlantic Ocean Ocean Drilling Program Oceanic Core Complex Formation Atlantis Massive 1 Atlantis Massive 2 ODP South Indian Ridge South Indian Ocean Grimes, Craig B Ushikubo, Takayuki John, Barbara E Valley, John W Stable oxygen isotope ratios in zircons from oceanic crust |
topic_facet |
118-735B 179-1105A 209-1270D 209-1275D 304-U1309B 304-U1309D 305-U1309D Atlantic DRILL Drilling/drill rig Exp304 Exp305 Indian Ocean Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Leg118 Leg179 Leg209 Marvel2000 MULT Multiple investigations North Atlantic Ocean Ocean Drilling Program Oceanic Core Complex Formation Atlantis Massive 1 Atlantis Massive 2 ODP South Indian Ridge South Indian Ocean |
description |
Lower ocean crust is primarily gabbroic, although 1-2% felsic igneous rocks that are referred to collectively as plagiogranites occur locally. Recent experimental evidence suggests that plagiogranite magmas can form by hydrous partial melting of gabbro triggered by seawater-derived fluids, and thus they may indicate early, high-temperature hydrothermal fluid circulation. To explore seawater-rock interaction prior to and during the genesis of plagiogranite and other late-stage magmas, oxygen-isotope ratios preserved in igneous zircon have been measured by ion microprobe. A total of 197 zircons from 43 plagiogranite, evolved gabbro, and hydrothermally altered fault rock samples have been analyzed. Samples originate primarily from drill core acquired during Ocean Drilling Program and Integrated Ocean Drilling Program operations near the Mid-Atlantic and Southwest Indian Ridges. With the exception of rare, distinctively luminescent rims, all zircons from ocean crust record remarkably uniform d18O with an average value of 5.2 ± 0.5 per mil (2SD). The average d18O(Zrc) would be in magmatic equilibrium with unaltered MORB [d18O(WR) ~5.6-5.7 per mil], and is consistent with the previously determined value for equilibrium with the mantle. The narrow range of measured d18O values is predicted for zircon crystallization from variable parent melt compositions and temperatures in a closed system, and provides no indication of any interactions between altered rocks or seawater and the evolved parent melts. If plagiogranite forms by hydrous partial melting, the uniform mantle-like d18O(Zrc) requires melting and zircon crystallization prior to significant amounts of water-rock interactions that alter the protolith d18O. Zircons from ocean crust have been proposed as a tectonic analog for >3.9 Ga detrital zircons from the earliest (Hadean) Earth by multiple workers. However, zircons from ocean crust are readily distinguished geochemically from zircons formed in continental crustal environments. Many of the >3.9 Ga zircons ... |
format |
Dataset |
author |
Grimes, Craig B Ushikubo, Takayuki John, Barbara E Valley, John W |
author_facet |
Grimes, Craig B Ushikubo, Takayuki John, Barbara E Valley, John W |
author_sort |
Grimes, Craig B |
title |
Stable oxygen isotope ratios in zircons from oceanic crust |
title_short |
Stable oxygen isotope ratios in zircons from oceanic crust |
title_full |
Stable oxygen isotope ratios in zircons from oceanic crust |
title_fullStr |
Stable oxygen isotope ratios in zircons from oceanic crust |
title_full_unstemmed |
Stable oxygen isotope ratios in zircons from oceanic crust |
title_sort |
stable oxygen isotope ratios in zircons from oceanic crust |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.772319 https://doi.org/10.1594/PANGAEA.772319 |
op_coverage |
MEDIAN LATITUDE: 12.287116 * MEDIAN LONGITUDE: -20.442310 * SOUTH-BOUND LATITUDE: -32.724000 * WEST-BOUND LONGITUDE: -46.903610 * NORTH-BOUND LATITUDE: 30.168650 * EAST-BOUND LONGITUDE: 57.277530 * DATE/TIME START: 1987-12-06T04:45:00 * DATE/TIME END: 2003-07-01T13:00:00 |
long_lat |
ENVELOPE(-46.903610,57.277530,30.168650,-32.724000) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Grimes, Craig B; Ushikubo, Takayuki; John, Barbara E; Valley, John W (2011): Uniformly mantle-like d18O in zircons from oceanic plagiogranites and gabbros. Contributions to Mineralogy and Petrology, 161(1), https://doi.org/10.1007/s00410-010-0519-x |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.772319 https://doi.org/10.1594/PANGAEA.772319 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.772319 https://doi.org/10.1007/s00410-010-0519-x |
_version_ |
1766136967320305664 |