Major, minor, and trace element compositions of peridotitic and basaltic komatiites from the precambrian crust of Southern Africa
| Autor: | Jeffrey W. Jacobs, Larry A. Haskin, Doris Knake, Joyce C. Brannon, A. Gunter Herrmann, Douglas P. Blanchard, Randy L. Korotev |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
Peridotite
Basalt Fractional crystallization (geology) Olivine 010504 meteorology & atmospheric sciences Partial melting Geochemistry Crust engineering.material 010502 geochemistry & geophysics 01 natural sciences Geophysics Geochemistry and Petrology Oceanic crust Ultramafic rock engineering Geology 0105 earth and related environmental sciences |
| Zdroj: | Contributions to Mineralogy and Petrology. 59:1-12 |
| ISSN: | 1432-0967 0010-7999 |
| DOI: | 10.1007/bf00375107 |
| Popis: | Major and trace element compositional data are reported for nine mafic and ultramafic rock samples from the Barberton greenstone belt. Rocks from this province are among the oldest fragments of the Earth's crust (∼3.5 b.y.). The data are consistent with an oceanic crust related origin for these rocks. The high abundances of Ni in these samples make their origin by fractional crystallization of a primitive magma unlikely but are consistent with their generation by partial melting of an upper mantle source. The basaltic samples from the Komati formation can be related by small degrees of partial melting of a primitive upper mantle source to the peridotitic komatiite which probably derived from much more extensive partial melting of a similar source. REE and especially Ni abundances limit the proportion of olivine that is permitted in the residue. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink