Chemical and isotopic compositions of volcanics from ODP Hole 210-1276
Site 1276, Leg 210 of the Ocean Drilling Program, was located on the Newfoundland margin in a seismically-defined ~128 Ma "transitional" crust just west of the presumed oceanic crust, and the M3 magnetic anomaly. The goal of drilling on this non-volcanic margin was to study the rifting, na...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.705419 2024-09-15T18:20:02+00:00 Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 Hart, Stanley R Blusztajn, Jerzy S LATITUDE: 45.405333 * LONGITUDE: -44.785833 * DATE/TIME START: 2003-02-09T00:00:00 * DATE/TIME END: 2003-07-16T00:00:00 2006 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.705419 https://doi.org/10.1594/PANGAEA.705419 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.705419 https://doi.org/10.1594/PANGAEA.705419 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Hart, Stanley R; Blusztajn, Jerzy S (2006): Age and geochemistry of the mafic sills, ODP site 1276, Newfoundland margin. Chemical Geology, 235(3-4), 222-237, https://doi.org/10.1016/j.chemgeo.2006.07.001 210-1276 COMPCORE Composite Core Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2006 ftpangaea https://doi.org/10.1594/PANGAEA.70541910.1016/j.chemgeo.2006.07.001 2024-08-21T00:02:25Z Site 1276, Leg 210 of the Ocean Drilling Program, was located on the Newfoundland margin in a seismically-defined ~128 Ma "transitional" crust just west of the presumed oceanic crust, and the M3 magnetic anomaly. The goal of drilling on this non-volcanic margin was to study the rifting, nature of basement, and post-rift sedimentation in the Newfoundland-Iberia rift. Drilling of this 1739 m hole was terminated 90-160 m above basement, in the lower of a doublet of alkaline diabase sills. We have carried out geochemical studies of the sill complex, in the hopes that they will provide proxy information regarding the nature of the underlying basement. Excellent 40Ar/39Ar plateau ages were obtained for the two sills: upper sill ~105.3 Ma; lower sill ~97.8 Ma. Thus the sills are substantially younger than the presumed age of the seafloor at site 1276 (~128 Ma), and were intruded beneath substantial sediment overburden (250 m for the upper, older sill, and 575 m for the lower younger sill). While some of the geochemistry of the sills has been compromised by alteration, the "immobile" trace elements show these sills to be hawaiites, differentiated from an enriched alkaline or basanitic parentage. Sr, Nd and Pb isotopes are suggestive of an enriched hotspot/plume mantle source, with a possible "added" component of continental material. These sills unequivocally were not derived from typical MORB (asthenospheric) upper mantle. Other/Unknown Material Newfoundland North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-44.785833,-44.785833,45.405333,45.405333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
210-1276 COMPCORE Composite Core Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
210-1276 COMPCORE Composite Core Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP Hart, Stanley R Blusztajn, Jerzy S Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
topic_facet |
210-1276 COMPCORE Composite Core Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Site 1276, Leg 210 of the Ocean Drilling Program, was located on the Newfoundland margin in a seismically-defined ~128 Ma "transitional" crust just west of the presumed oceanic crust, and the M3 magnetic anomaly. The goal of drilling on this non-volcanic margin was to study the rifting, nature of basement, and post-rift sedimentation in the Newfoundland-Iberia rift. Drilling of this 1739 m hole was terminated 90-160 m above basement, in the lower of a doublet of alkaline diabase sills. We have carried out geochemical studies of the sill complex, in the hopes that they will provide proxy information regarding the nature of the underlying basement. Excellent 40Ar/39Ar plateau ages were obtained for the two sills: upper sill ~105.3 Ma; lower sill ~97.8 Ma. Thus the sills are substantially younger than the presumed age of the seafloor at site 1276 (~128 Ma), and were intruded beneath substantial sediment overburden (250 m for the upper, older sill, and 575 m for the lower younger sill). While some of the geochemistry of the sills has been compromised by alteration, the "immobile" trace elements show these sills to be hawaiites, differentiated from an enriched alkaline or basanitic parentage. Sr, Nd and Pb isotopes are suggestive of an enriched hotspot/plume mantle source, with a possible "added" component of continental material. These sills unequivocally were not derived from typical MORB (asthenospheric) upper mantle. |
format |
Other/Unknown Material |
author |
Hart, Stanley R Blusztajn, Jerzy S |
author_facet |
Hart, Stanley R Blusztajn, Jerzy S |
author_sort |
Hart, Stanley R |
title |
Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
title_short |
Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
title_full |
Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
title_fullStr |
Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
title_full_unstemmed |
Chemical and isotopic compositions of volcanics from ODP Hole 210-1276 |
title_sort |
chemical and isotopic compositions of volcanics from odp hole 210-1276 |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.705419 https://doi.org/10.1594/PANGAEA.705419 |
op_coverage |
LATITUDE: 45.405333 * LONGITUDE: -44.785833 * DATE/TIME START: 2003-02-09T00:00:00 * DATE/TIME END: 2003-07-16T00:00:00 |
long_lat |
ENVELOPE(-44.785833,-44.785833,45.405333,45.405333) |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Supplement to: Hart, Stanley R; Blusztajn, Jerzy S (2006): Age and geochemistry of the mafic sills, ODP site 1276, Newfoundland margin. Chemical Geology, 235(3-4), 222-237, https://doi.org/10.1016/j.chemgeo.2006.07.001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.705419 https://doi.org/10.1594/PANGAEA.705419 |
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.70541910.1016/j.chemgeo.2006.07.001 |
_version_ |
1810458408084570112 |