Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin
Serpentinized spinel peridotites of the Newfoundland margin drilled during ODP Leg 210 at Site 1277 have preserved, relic mineral compositions similar to the most depleted abyssal peridotites worldwide and different from those of the conjugate Iberian margin. The samples are derived from mass flows...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.707815 2024-09-15T18:19:48+00:00 Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin Müntener, Othmar Manatschal, Gianreto LATITUDE: 45.196660 * LONGITUDE: -44.376660 * DATE/TIME START: 2003-09-02T18:10:00 * DATE/TIME END: 2003-09-04T13:30:00 2006 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.707815 https://doi.org/10.1594/PANGAEA.707815 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.707815 https://doi.org/10.1594/PANGAEA.707815 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Müntener, Othmar; Manatschal, Gianreto (2006): High degrees of melt extraction recorded by spinel harzburgite of the Newfoundland margin: The role of inheritance and consequences for the evolution of the southern North Atlantic. Earth and Planetary Science Letters, 252(3-4), 437-452, https://doi.org/10.1016/j.epsl.2006.10.009 210-1277A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2006 ftpangaea https://doi.org/10.1594/PANGAEA.70781510.1016/j.epsl.2006.10.009 2024-08-21T00:02:25Z Serpentinized spinel peridotites of the Newfoundland margin drilled during ODP Leg 210 at Site 1277 have preserved, relic mineral compositions similar to the most depleted abyssal peridotites worldwide and different from those of the conjugate Iberian margin. The samples are derived from mass flows containing clasts of peridotite and gabbro and from in-situ basement, and are mostly mylonitic cpx-poor spinel harzburgites with Cr-rich spinels (Cr#0.35-0.66). Melting of the Newfoundland mantle occurred in the spinel peridotite field and probably exceeded the cpx-out phase boundary for some samples. Using proposed spinel peridotite melting models and experimentally derived phase diagrams, the Newfoundland harzburgites can be modeled as a residue after extraction of 14 to 20-25% melting. Basalts that are interleaved with mass flow deposits on top of the peridotite basement resemble normal to transitional mid-ocean ridge basalt. This, together with the unusually high Cr# of some spinel harzburgites suggest that the formation of basalts and partial melting of the underlying peridotite are not cogenetic. Among mantle samples some of the Newfoundland harzburgites approach mineral compositions of the Bay of island ophiolite and ophiolites from Japan that represent peridotites formed in an arc-setting. Thus, the peridotites drilled at Site 1277 may represent inherited (Caledonian or older) subarc mantle that was exhumed close to the ocean floor during the rifting evolution of the Atlantic. Compared to the spinel harzburgites from Newfoundland, the peridotites from the conjugate Iberian margin are, on average, less depleted and provide evidence for local equilibration in the plagioclase stability field. This can either be explained by an inherited, primary, Ca-richer composition of the Iberia peridotite, or, alternatively, by local melt impregnation and stagnation during continental rifting, and thus refertilizing previously depleted (arc-related) peridotite. Other/Unknown Material Newfoundland North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-44.376660,-44.376660,45.196660,45.196660) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
210-1277A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
210-1277A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP Müntener, Othmar Manatschal, Gianreto Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
topic_facet |
210-1277A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Serpentinized spinel peridotites of the Newfoundland margin drilled during ODP Leg 210 at Site 1277 have preserved, relic mineral compositions similar to the most depleted abyssal peridotites worldwide and different from those of the conjugate Iberian margin. The samples are derived from mass flows containing clasts of peridotite and gabbro and from in-situ basement, and are mostly mylonitic cpx-poor spinel harzburgites with Cr-rich spinels (Cr#0.35-0.66). Melting of the Newfoundland mantle occurred in the spinel peridotite field and probably exceeded the cpx-out phase boundary for some samples. Using proposed spinel peridotite melting models and experimentally derived phase diagrams, the Newfoundland harzburgites can be modeled as a residue after extraction of 14 to 20-25% melting. Basalts that are interleaved with mass flow deposits on top of the peridotite basement resemble normal to transitional mid-ocean ridge basalt. This, together with the unusually high Cr# of some spinel harzburgites suggest that the formation of basalts and partial melting of the underlying peridotite are not cogenetic. Among mantle samples some of the Newfoundland harzburgites approach mineral compositions of the Bay of island ophiolite and ophiolites from Japan that represent peridotites formed in an arc-setting. Thus, the peridotites drilled at Site 1277 may represent inherited (Caledonian or older) subarc mantle that was exhumed close to the ocean floor during the rifting evolution of the Atlantic. Compared to the spinel harzburgites from Newfoundland, the peridotites from the conjugate Iberian margin are, on average, less depleted and provide evidence for local equilibration in the plagioclase stability field. This can either be explained by an inherited, primary, Ca-richer composition of the Iberia peridotite, or, alternatively, by local melt impregnation and stagnation during continental rifting, and thus refertilizing previously depleted (arc-related) peridotite. |
format |
Other/Unknown Material |
author |
Müntener, Othmar Manatschal, Gianreto |
author_facet |
Müntener, Othmar Manatschal, Gianreto |
author_sort |
Müntener, Othmar |
title |
Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
title_short |
Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
title_full |
Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
title_fullStr |
Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
title_full_unstemmed |
Major element concentrations in spinel, olivine and pyroxene from peridotites of ODP Hole 210-1277 of the Newfoundland margin |
title_sort |
major element concentrations in spinel, olivine and pyroxene from peridotites of odp hole 210-1277 of the newfoundland margin |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.707815 https://doi.org/10.1594/PANGAEA.707815 |
op_coverage |
LATITUDE: 45.196660 * LONGITUDE: -44.376660 * DATE/TIME START: 2003-09-02T18:10:00 * DATE/TIME END: 2003-09-04T13:30:00 |
long_lat |
ENVELOPE(-44.376660,-44.376660,45.196660,45.196660) |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Supplement to: Müntener, Othmar; Manatschal, Gianreto (2006): High degrees of melt extraction recorded by spinel harzburgite of the Newfoundland margin: The role of inheritance and consequences for the evolution of the southern North Atlantic. Earth and Planetary Science Letters, 252(3-4), 437-452, https://doi.org/10.1016/j.epsl.2006.10.009 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.707815 https://doi.org/10.1594/PANGAEA.707815 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.70781510.1016/j.epsl.2006.10.009 |
_version_ |
1810458145615511552 |