NDLI: Petrogenetic evolution of the Koziakas ophiolite complex (W. Thessaly, Greece)

Content Provider	Springer Nature Link
Author	Pomonis, P. Tsikouras, B. Hatzipanagiotou, K.
Copyright Year	2006
Abstract	The Koziakas ophiolitic complex is situated in W. Thessaly and is interpreted as an incomplete ophiolite sequence, thrust over the Western Thessaly Unit (W.T.U.). Two tectonically distinct units represent it: (1) the lower unit with a metamorphic sole and a tectonosedimentary mélange and (2) the upper unit including mantle peridotites and basaltic lavas. The mantle peridotites are composed by harzburgite, lherzolite and plagioclase lherzolite intruded by a sparse network of gabbroic, plagiogranitic and doleritic dykes. The volcanic sequence of the upper unit can be geochemically subdivided into four groups of basalts with: (1) tholeiitic N-type MORB affinities, (2) low-Ti boninitic affinities, (3) subalkalic E-MORB type affinities and (4) alkali characteristics displaying a different petrogenetic evolution with respect to the other groups. The magmatic history of the Koziakas ophiolite is in agreement with extensive fractional crystallization and variable degrees of partial melting of a heterogeneous mantle source, yielding, magmas mainly of MORB composition. Modal and cryptic metasomatic phenomena of the mantle peridotites as well as Sr-Nd isotopic ratios imply that this melt contained also a hydrous component derived from melting of a subducted lithosphere. The above geochemical characteristics and the correlation with the adjacent ophiolite suites of Pindos, Othris and Vourinos indicate that Koziakas ophiolitic complex formed in a small backarc basin situated at the eastern margin of the greater Pindos Ocean, between the Western Thessaly Unit (W.T.U.) and the Pelagonian continent.
Starting Page	77
Ending Page	111
Page Count	35
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	89
Issue Number	1-2
e-ISSN	14381168
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-07-13
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemistry Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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