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Geochemistry and trace elements at DSDP Hole 78-543A

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.808824
Keywords
  • # = Total Iron
  • 1050 Deg
  • 78-543A
  • Ab
  • Al
  • Al2O3
  • Albite
  • Aluminium
  • Aluminium Oxide
  • An
  • Anorthite
  • Antimony
  • Ap
  • Apatite
  • Ba
  • Barium
  • Ca
  • Caesium
  • Calcium
  • Calcium Oxide
  • Calculated
  • Calculated Based On Oxygen Number
  • Cao
  • Chromium
  • Chromium(Iii) Oxide
  • Cipw
  • Co
  • Cobalt
  • Comment
  • Cr
  • Cr2O3
  • Cs
  • Deep Sea Drilling Project
  • Differentiation Index
  • Diff Index
  • Diposide
  • Drilling
  • Dsdp
  • Electron Microprobe
  • Element Analysis
  • Neutron Activation (Naa)
  • En
  • Enstatite
  • Estimated By Stoichiometry To 24 Cations And 32 Oxygens
  • Eu
  • Europium
  • Fa
  • Fayalite
  • Fe
  • Fe2+
  • Fe2O3
  • Fe3+
  • Feo
  • Ferrosilite
  • Fo
  • Forsterite
  • Fs
  • Glomar Challenger
  • Hafnium
  • Hf
  • Id
  • Identification
  • Ilm
  • Ilmenite
  • Iron
  • Iron 2+
  • Iron 3+
  • Iron Oxide
  • Fe2O3
  • Iron Oxide
  • Feo
  • K2O
  • La
  • Label
  • Lanthanum
  • Leg78
  • Loi
  • Loss On Ignition
  • Magnesium
  • Magnesium Oxide
  • Magnetite
  • Magnt
  • Manganese
  • Manganese Oxide
  • Mg
  • Mgo
  • Mn
  • Mno
  • Na2O
  • Nb
  • Ni
  • Nickel
  • Niobium
  • North Atlantic/Cont Rise
  • Odp Sample Designation
  • Or
  • Orthoclase
  • P2O5
  • Phosphorus Oxide
  • Potassium Oxide
  • Quartz
  • Rb
  • Rubidium
  • Sample Code/Label
  • Sb
  • Sc
  • Scandium
  • Si
  • Silicon
  • Silicon Dioxide
  • Sio2
  • Sodium Oxide
  • So Index
  • Solidification Index
  • Sr
  • Strontium
  • Ta
  • Tantalum
  • Tb
  • Terbium
  • Ternary Components Are Computed From Structural Formulas En = Mg
  • Ternary Components Are Computed From Structural Formulas Fs = Fe + Mn
  • Normalized To 100%
  • Ternary Components Are Computed From Structural Formulas Wo = Ca
  • Th
  • Thorium
  • Ti
  • Tio2
  • Titanium
  • Titanium Oxide
  • Total
  • Total Iron
  • U
  • Uranium
  • V
  • Vanadium
  • Wo
  • Wollastonite
  • X-Ray Fluorescence (Xrf)
  • Y
  • Yttrium
  • Zinc
  • Zn
Disciplines
  • Chemistry
  • Earth Science

Abstract

The upper part of the basaltic substratum of the Atlantic abyssal plain, approaching subduction beneath the Barbados Ridge and thus presumably beneath the Lesser Antilles island arc, is made of typical LREE-depleted oceanic tholeiites. Mineralogical (microprobe) and geochemical (X-ray fluorescence, neutron activation analyses) data are given for 12 samples from the bottom of Hole 543A, which is 3.5 km seaward of the deformation front of the Barbados Ridge complex. These basalts are overlain by a Quaternary to Maestrichtian-Campanian sedimentary sequence. Most of the basalts are relatively fresh (in spite of the alteration of olivine and development of some celadonite, clays, and chlorite in their groundmass), and their mineralogical and geochemical compositions are similar to those of LREE-depleted recent basalts from the Mid-Atlantic Ridge. The most altered samples occur at the top of the basaltic sequence, and show trends of enrichment in alkali metals typical of altered oceanic tholeiites.

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