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Post-collisional Cenozoic extension in the northern Aegean: The high-K to shoshonitic intrusive rocks of the Maronia Magmatic Corridor, northeastern Greece

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages20
JournalLithosphere
Early online date15 Jun 2018
DOIs
DateAccepted/In press - 16 Apr 2018
DateE-pub ahead of print (current) - 15 Jun 2018

Abstract

The Maronia Magmatic Corridor is a NE-trending belt of Oligocene plutons that intrudes the Kechros Dome of the northern Rhodope Core Complex in northeastern Greece.The post-collisional magmatism transitions from early high-K calc-alkaline magmatism in the NE to a younger, shoshonitic phase in the SW. We use a full suite of whole-rock geochemical analyses, including rare earth elements, to show a shared metasomatized mantle source of the magmatism. Evidence of plagioclase saturation from the onset of crystallization and amphibole-pyroxene-controlled fractionation in the high-K calc-alkaline magmatism suggest a drier (<4.75 wt% H2O) parental magma than is typical of subduction-related magmatism. Continued H2O depletion of the metasomatized source mantle resulted in the transition to a shoshonitic trend where deep crustal fractionation of an H2O-poor (< ~2 wt% H2O) magma in the absence of major olivine resulted in incompatible enrichment over a small range of SiO2. High-precision U-Pb zircon geochronology is presented here for the first time to provide chronological markers for the transition in the magmatic evolution of the Kechros dome. A 2.2 Myr break in magmatism separates the intrusion of the shoshonitic Maronia pluton at 29.8 Ma from the emplacement of the rest of the high-K calc-alkaline Maronia Magmatic Corridor between 32.9–32.0 Ma. The Maronia pluton is the hottest, driest, and youngest episode of post-collisional magmatism in the Kechros dome; we suggest that the emplacement of Maronia marks the cessation of magmatism in the northern Rhodope Core Complex as asthenospheric mantle upwelling migrated southward.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via GSA at https://pubs.geoscienceworld.org/gsa/lithosphere/article/533141/post-collisional-cenozoic-extension-in-the . Please refer to any applicable terms of use of the publisher.

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