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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, 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.

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Hart, Stanley R, Blusztajn, Jerzy S (2006). Dataset: Chemical and isotopic compositions of volcanics from ODP Hole 210-1276. https://doi.org/10.1594/PANGAEA.705419

DOI retrieved: 2006

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.705419
Author Hart, Stanley R
Given Name Stanley R
Family Name Hart
More Authors
Blusztajn, Jerzy S
Source Creation 2006
Publication Year 2006
Resource Type application/zip - filename: Hart-2006
Subject Areas
Name: Chemistry

Name: Lithosphere

Related Identifiers
Title: Age and geochemistry of the mafic sills, ODP site 1276, Newfoundland margin
Identifier: https://doi.org/10.1016/j.chemgeo.2006.07.001
Type: DOI
Relation: IsSupplementTo
Year: 2006
Source: Chemical Geology
Authors: Hart Stanley R , Blusztajn Jerzy S .