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Anhydrous partial melting of MORB pyrolite and other peridotite compositions at 10 kbar: implications for the origin of primitive MORB glasses
Citation
Falloon, TJ and Green, DH, Anhydrous partial melting of MORB pyrolite and other peridotite compositions at 10 kbar: implications for the origin of primitive MORB glasses, Mineralogy and Petrology, 37, (3-4) pp. 181-219. ISSN 0930-0708 (1987) [Refereed Article]
Copyright Statement
© 1987 by Springer-Verlag
Abstract
Anhydrous partial melting experiments on four peridotite compositions have been
conducted at 10 kbar providing a relatively internally consistent set of data on the
character of primary melts expected from the oceanic upper mantle in the mid-ocean
ridge setting. The four peridotite compositions are: "MORB pyrolite" (considered to
be suitable for the production of primitive (Mg#≥0.68) MORB glasses at 10 kbar),
"Hawaiian pyrolite" (representative of "enriched" upper mantle), Tinaquillo lherzolite
(representative of more "depleted" upper mantle), and the spinel lherzolite KLB-1
which is a suitable composition for the production of primitive MORB glasses. The
equilibrium liquids were determined by "sandwich" experiments. The primitive MORB
glass DSDP 3-18-7-1 was used in experiments using MORB pyrolite and KLB-1, while
a calculated 10 kbar liquid composition from Jaques and Green (1980) was used in
experiments with Hawaiian pyrolite and Tinaquillo lherzolite. The results of the experiments
are used to test a 10 kbar melt model for the generation of primitive MORB
glasses, which are parental magmas to typical MORB compositions. The melt compositions
from the four peridotites studied are significantly different from primitive
MORB glasses in major element chemistry and plot away from the field of primitive
MORB glasses in the CIPW molecular normative "Basalt tetrahedron". The results
indicate that primitive MORB glasses are derivative compositions lying on olivine
fractionation lines from picritic parents, which themselves are primary magmas at
pressures greater than 10 kbar. The results of this study are integrated with previous
10 kbar experimental studies.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | MORB pyrolite, Hawaiian pyrolite, Tinaquillo Lherzolite, KLB-1, peridotite melting experiments, sandwich technique, MORB petrogenesis, olivine fractionation, picrite, 10kbar, 1GPa, anhydrous |
Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Igneous and metamorphic petrology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Falloon, TJ (Dr Trevor Falloon) |
UTAS Author: | Green, DH (Professor David Green) |
ID Code: | 99100 |
Year Published: | 1987 |
Web of Science® Times Cited: | 203 |
Deposited By: | Earth Sciences |
Deposited On: | 2015-03-13 |
Last Modified: | 2015-04-21 |
Downloads: | 0 |
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