Mineralogy, geochemistry and geotectonic significance of harzburgites from the southern Dramala upper mantle suite, Pindos ophiolite complex, NW Greece

2014 ◽  
Vol 51 (2) ◽  
pp. 236-262 ◽  
Author(s):  
Argyrios N. Kapsiotis
Keyword(s):  
Upper Mantle ◽  
Ophiolite Complex

Mineralogy, composition and PGM of chromitites from Pefki, Pindos ophiolite complex (NW Greece): evidence for progressively elevated fAs conditions in the upper mantle sequence

2010 ◽  
Vol 101 (1-2) ◽  
pp. 129-150 ◽  
Author(s):  
Argirios Kapsiotis ◽  
Tassos A. Grammatikopoulos ◽  
Basilios Tsikouras ◽  
Konstantin Hatzipanagiotou ◽  
Federica Zaccarini ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Ophiolite Complex

Olivine fabrics in the Bay of Islands Ophiolite: implications for oceanic mantle structure and anisotropy

1985 ◽  
Vol 22 (12) ◽  
pp. 1757-1766 ◽  
Author(s):  
Matthew H. Salisbury ◽  
Nikolas I. Christensen
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Plastic Flow ◽  
Upper Mantle ◽  
Mafic Rock ◽  
Ultramafic Rocks ◽  
Slip Systems ◽  
Mantle Structure ◽  
Ophiolite Complex ◽  
Crust And Upper Mantle

Petrofabric analysis of oriented ultramafic and mafic rock samples from six traverses representing all four massifs of the Bay of Islands ophiolite complex, Newfoundland, indicate that the ultramafic rocks are tectonites displaying fabrics consistent with high-temperature plastic flow on the olivine (010) [100] and (0kl) [100] slip systems. The fabric orientation is uniform in three of the four massifs but varies between massifs, suggesting differential rotation before or during emplacement. Within North Arm Mountain, the olivine a axes are aligned approximately perpendicular to the sheeted dikes in both the ultramafic tectonites and the overlying gabbroic tectonites. In Blow Me Down Mountain, the olivine a axes in the gabbros are perpendicular to the dikes, but they are parallel to them in the ultramafic rocks. It is concluded that the ultramafic rocks on Blow Me Down Mountain were rotated 90° during emplacement or that local decoupling and rotation occurred between the crust and upper mantle prior to emplacement. Within the Lewis Hills, the olivine fabrics rotate and weaken near the shear zone in the center of the massif. A second deformation, perhaps associated with low-temperature plastic flow, appears to have obliterated the fabric patterns still observed in the ultramafic rocks to the east.

Chemical heterogeneity in the upper mantle recorded by peridotites and chromitites from the Shetland Ophiolite Complex, Scotland

2012 ◽  
Vol 333-334 ◽  
pp. 226-237 ◽  
Author(s):  
Brian O'Driscoll ◽  
James M.D. Day ◽  
Richard J. Walker ◽  
J. Stephen Daly ◽  
William F. McDonough ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Chemical Heterogeneity ◽  
Ophiolite Complex
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