Tectonic Settings of Potassic Igneous Rocks

Müller, Daniel; Groves, David

doi:10.1007/978-3-319-23051-1_3

Cited by 1 publication

(1 citation statement)

References 216 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5B, 6G, 6H). Geochemical and isotopic evidence advocate a heterogeneous, highly metasomatized source mantle as the foundation for the generation of ultra-potassic shoshonitic to lamproitic magmas (e.g., Foley et al, 1987;Beccaluva et al, 2013;Condamine and Médard, 2014;Müller and Groves, 2016). Sr isotopic data from the MMC reported by Del Moro et al (1988;Table 4), show consistently enriched radiogenic 87 Sr across the Kassiteres-Leptokaria ( 87 Sr/ 86 Sr = 0.7057-0.7080) and Maronia ( 87 Sr/ 86 Sr = 0.7061-0.7076) magmatic suites.…”

Section: Petrogenesis Of the Maronia Plutonmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

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% H 2 O) parental magma than is typical of subduction-related magmatism. Continued H 2 O depletion of the metasomatized source mantle resulted in the transition to a shoshonitic trend where deep crustal fractionation of an H 2 O-poor (< ~2 wt% H 2 O) magma in the absence of major olivine resulted in incompatible enrichment over a small range of SiO 2. 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.

show abstract

Section: Petrogenesis Of the Maronia Plutonmentioning

confidence: 99%