| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Journal of Petrology | Volume 44 | Number 10 | Pages 1759-1785 | 2003
© Oxford University Press 2003; all rights reserved
Geochemistry of the Othris Ophiolite, Greece: Evidence for Refertilization?
1 VENING MEINESZ RESEARCH SCHOOL OF GEODYNAMICS, FACULTEIT AARDWETENSCHAPPEN, UNIVERSITEIT UTRECHT, BUDAPESTLAAN 4, 3584 CD UTRECHT, THE NETHERLANDS
2 FACULTEIT DER AARD- EN LEVENSWETENSCHAPPEN, VRIJE UNIVERSITEIT AMSTERDAM, DE BOELELAAN 1085, 1081 HV AMSTERDAM, THE NETHERLANDS
3 DEPARTMENT OF GEOLOGY, UNIVERSITY OF LEICESTER, UNIVERSITY ROAD, LEICESTER LE1 7RH, UK
* Corresponding author. Telephone: + 31 30 253 5071. Fax : + 31 30 253 5030. E-mail: barth{at}post.harvard.edu
The Othris peridotite massif, Greece, shows conflicting evidence for a mid-ocean ridge and supra-subduction zone tectonic setting with the presence of plagioclase peridotite that may represent an area of either incomplete melt extraction, or melt impregnation and accumulation. To address these problems we focus on a 3 km continuous section in the Fournos Kaïtsa area, consisting of layers of harzburgite, plagioclase harzburgite and plagioclase lherzolite with accurately known structural and petrographic control. Refractory, Cr-rich spinel compositions and light rare earth element depleted clinopyroxenes in the harzburgites are consistent with 
15% dry partial melting. Simple batch and fractional melting models are not sufficient to explain the composition of the residual phases and a multistage model with some melting in the garnet stability field is proposed. The pyroxenes from the plagioclase peridotites have higher Ti and rare earth element contents than those from the harzburgites, but similar refractory spinel compositions in both rock types indicate that the plagioclase peridotites may be products of impregnation of harzburgites with a fractionating melt. These observations are in good agreement with previous structural studies and suggest that the moderately depleted Fournos Kaïtsa mantle section most probably originated at a slow-spreading mid-ocean ridge.
KEY WORDS: melt impregnation; Othris Ophiolite; plagioclase lherzolite; refertilization
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  L. Pelletier, F. Vils, A. KALT, and K. Gmeling Li, B and Be Contents of Harzburgites from the Dramala Complex (Pindos Ophiolite, Greece): Evidence for a MOR-type Mantle in a Supra-subduction Zone Environment J. Petrology, December 4, 2008; (2008) egn057v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. Rampone and G. Borghini Melt migration and intrusion in the Erro-Tobbio peridotites (Ligurian Alps, Italy): Insights on magmatic processes in extending lithospheric mantle European Journal of Mineralogy, August 1, 2008; 20(4): 573 - 585. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Sano and J.-I. Kimura Clinopyroxene REE Geochemistry of the Red Hills Peridotite, New Zealand: Interpretation of Magmatic Processes in the Upper Mantle and in the Moho Transition Zone J. Petrology, January 1, 2007; 48(1): 113 - 139. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. RAMPONE, A. ROMAIRONE, W. ABOUCHAMI, G. B. PICCARDO, and A. W. HOFMANN Chronology, Petrology and Isotope Geochemistry of the Erro-Tobbio Peridotites (Ligurian Alps, Italy): Records of Late Palaeozoic Lithospheric Extension J. Petrology, April 1, 2005; 46(4): 799 - 827. [Abstract] [Full Text] [PDF]
|
|