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Zinc, copper, and lead geochemistry of oceanic igneous rocks - ridges, islands, and arcs

International Geology Review

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Abstract

Variations in the abundances of Zn, Cu, and Pb are found to be useful in identifying tectonic regimes and separating ocean-island basalts into enriched- and depleted-source categories. The average Zn, Cu, and Pb contents of normal mid-ocean ridge basalts (N-MORB) are 84, 70, and 0.35 ppm, respectively. Differences in average Zn contents for various ridges reflect more the varying degrees of differentiation than variations of Zn content in the source rocks. At a Mg# of 70, or Mg#70, which is taken to represent primitive MORB, many MORB sequences converge at a Zn content of 58??6 ppm, which is close to the value for primitive mantle (50 ppm) and ordinary chondrites (~55 ppm). -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Zinc, copper, and lead geochemistry of oceanic igneous rocks - ridges, islands, and arcs
Series title:
International Geology Review
Volume
37
Issue:
5
Year Published:
1995
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
International Geology Review
First page:
379
Last page:
420