40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone
Long-lived intra-oceanic arcs of Izu-Bonin-Marianas (IBM)-type are built on thick, granodioritic crust formed in the absence of pre-existing continental crust. International Ocean Discovery Program Expedition 350, Site U1437, explored the IBM rear arc to better understand continental crust formation...
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Taylor & Francis
2017
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ftdatacite:10.6084/m9.figshare.5379151.v1 2023-05-15T16:53:02+02:00 40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone Schmitt, Axel K. Konrad, Kevin Andrews, Graham D. M. Horie, Kenji Brown, Sarah R. Koppers, Anthony A. P. Pecha, Mark Busby, Cathy J. Tamura, Yoshihiko 2017 https://dx.doi.org/10.6084/m9.figshare.5379151.v1 https://tandf.figshare.com/articles/dataset/_sup_40_sup_Ar_sup_39_sup_Ar_ages_and_zircon_petrochronology_for_the_rear_arc_of_the_Izu-Bonin-Marianas_intra-oceanic_subduction_zone/5379151/1 unknown Taylor & Francis https://dx.doi.org/10.1080/00206814.2017.1363675 https://dx.doi.org/10.6084/m9.figshare.5379151 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Cell Biology Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Marine Biology Inorganic Chemistry dataset Dataset 2017 ftdatacite https://doi.org/10.6084/m9.figshare.5379151.v1 https://doi.org/10.1080/00206814.2017.1363675 https://doi.org/10.6084/m9.figshare.5379151 2021-11-05T12:55:41Z Long-lived intra-oceanic arcs of Izu-Bonin-Marianas (IBM)-type are built on thick, granodioritic crust formed in the absence of pre-existing continental crust. International Ocean Discovery Program Expedition 350, Site U1437, explored the IBM rear arc to better understand continental crust formation in arcs. Detailed petrochronological (U–Pb geochronology combined with trace elements, oxygen and hafnium isotopes) characterizations of zircon from Site U1437 were carried out, taking care to exclude potential contaminants by (1) comparison of zircon ages with ship-board palaeomagnetic and biostratigraphic ages and 40 Ar/ 39 Ar geochronology, (2) analysing zircon from drill muds for comparison, (3) selectively carrying out in situ analysis in petrographic thin sections, and (4) minimizing potential laboratory contamination through using pristine equipment during mineral separation. The youngest zircon ages in Site U1437 are consistent with 40 Ar/ 39 Ar and shipboard ages to a depth of ~1390 m below sea floor (mbsf) where Igneous Unit Ig 1 yielded an 40 Ar/ 39 Ar age of 12.9 ± 0.3 Ma (all errors 2σ). One single zircon (age 15.4 ± 1.0 Ma) was recovered from the deepest lithostratigraphic unit drilled, Unit VII (1459.80–1806.5 mbsf). Site U1437 zircon trace element compositions are distinct from those of oceanic and continental arc environments and differ from those generated in thick oceanic crust (Iceland-type) where low-δ 18 O evolved melts are produced via re-melting of hydrothermally altered mafic rocks. Ti-in-zircon model temperatures are lower than for mid-ocean ridge rocks, in agreement with low zircon saturation temperatures, suggestive of low-temperature, hydrous melt sources. Zircon oxygen (δ 18 O = 3.3–6.0‰) and hafnium (εHf = + 10–+16) isotopic compositions indicate asthenospheric mantle sources. Trace element and isotopic differences between zircon from Site U1437 rear-arc rocks and the Hadean detrital zircon population suggest that preserved Hadean zircon crystals were probably generated in an environment different from modern oceanic convergent margins underlain by depleted mantle. Dataset Iceland DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
unknown |
topic |
Cell Biology Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Marine Biology Inorganic Chemistry |
spellingShingle |
Cell Biology Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Marine Biology Inorganic Chemistry Schmitt, Axel K. Konrad, Kevin Andrews, Graham D. M. Horie, Kenji Brown, Sarah R. Koppers, Anthony A. P. Pecha, Mark Busby, Cathy J. Tamura, Yoshihiko 40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
topic_facet |
Cell Biology Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Marine Biology Inorganic Chemistry |
description |
Long-lived intra-oceanic arcs of Izu-Bonin-Marianas (IBM)-type are built on thick, granodioritic crust formed in the absence of pre-existing continental crust. International Ocean Discovery Program Expedition 350, Site U1437, explored the IBM rear arc to better understand continental crust formation in arcs. Detailed petrochronological (U–Pb geochronology combined with trace elements, oxygen and hafnium isotopes) characterizations of zircon from Site U1437 were carried out, taking care to exclude potential contaminants by (1) comparison of zircon ages with ship-board palaeomagnetic and biostratigraphic ages and 40 Ar/ 39 Ar geochronology, (2) analysing zircon from drill muds for comparison, (3) selectively carrying out in situ analysis in petrographic thin sections, and (4) minimizing potential laboratory contamination through using pristine equipment during mineral separation. The youngest zircon ages in Site U1437 are consistent with 40 Ar/ 39 Ar and shipboard ages to a depth of ~1390 m below sea floor (mbsf) where Igneous Unit Ig 1 yielded an 40 Ar/ 39 Ar age of 12.9 ± 0.3 Ma (all errors 2σ). One single zircon (age 15.4 ± 1.0 Ma) was recovered from the deepest lithostratigraphic unit drilled, Unit VII (1459.80–1806.5 mbsf). Site U1437 zircon trace element compositions are distinct from those of oceanic and continental arc environments and differ from those generated in thick oceanic crust (Iceland-type) where low-δ 18 O evolved melts are produced via re-melting of hydrothermally altered mafic rocks. Ti-in-zircon model temperatures are lower than for mid-ocean ridge rocks, in agreement with low zircon saturation temperatures, suggestive of low-temperature, hydrous melt sources. Zircon oxygen (δ 18 O = 3.3–6.0‰) and hafnium (εHf = + 10–+16) isotopic compositions indicate asthenospheric mantle sources. Trace element and isotopic differences between zircon from Site U1437 rear-arc rocks and the Hadean detrital zircon population suggest that preserved Hadean zircon crystals were probably generated in an environment different from modern oceanic convergent margins underlain by depleted mantle. |
format |
Dataset |
author |
Schmitt, Axel K. Konrad, Kevin Andrews, Graham D. M. Horie, Kenji Brown, Sarah R. Koppers, Anthony A. P. Pecha, Mark Busby, Cathy J. Tamura, Yoshihiko |
author_facet |
Schmitt, Axel K. Konrad, Kevin Andrews, Graham D. M. Horie, Kenji Brown, Sarah R. Koppers, Anthony A. P. Pecha, Mark Busby, Cathy J. Tamura, Yoshihiko |
author_sort |
Schmitt, Axel K. |
title |
40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
title_short |
40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
title_full |
40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
title_fullStr |
40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
title_full_unstemmed |
40 Ar/ 39 Ar ages and zircon petrochronology for the rear arc of the Izu-Bonin-Marianas intra-oceanic subduction zone |
title_sort |
40 ar/ 39 ar ages and zircon petrochronology for the rear arc of the izu-bonin-marianas intra-oceanic subduction zone |
publisher |
Taylor & Francis |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.5379151.v1 https://tandf.figshare.com/articles/dataset/_sup_40_sup_Ar_sup_39_sup_Ar_ages_and_zircon_petrochronology_for_the_rear_arc_of_the_Izu-Bonin-Marianas_intra-oceanic_subduction_zone/5379151/1 |
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Iceland |
genre_facet |
Iceland |
op_relation |
https://dx.doi.org/10.1080/00206814.2017.1363675 https://dx.doi.org/10.6084/m9.figshare.5379151 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.5379151.v1 https://doi.org/10.1080/00206814.2017.1363675 https://doi.org/10.6084/m9.figshare.5379151 |
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