Mantle source characteristics and melting models for the early-middle Miocene mafic volcanism in Western Anatolia Implications for enrichment processes of mantle lithosphere and origin of K-rich volcanism in post-collisional settings

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ERSOY E. Y., Helvaci C., Palmer M. R.

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, vol.198, pp.112-128, 2010 (SCI-Expanded)

• Publication Type: Article / Article
• Volume: 198
• Publication Date: 2010
• Doi Number: 10.1016/j.jvolgeores.2010.08.014
• Journal Name: JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Page Numbers: pp.112-128
• Keywords: Western Anatolia, Neogene volcanism, Shoshonitic volcanism, Ultrapotassic volcanism, Subduction enrichment, TRACE-ELEMENT PARTITION, CALC-ALKALINE MAGMATISM, MENDERES-MASSIF, FRACTIONAL CRYSTALLIZATION, GEOCHEMICAL CONSTRAINTS, ISOTOPE GEOCHEMISTRY, BASALTIC MAGMAS, IGNEOUS ROCKS, NW ANATOLIA, SR ISOTOPE
• Dokuz Eylül University Affiliated: Yes

Abstract

In Western Anatolia early-middle Miocene post-collisional volcanism is represented by K nch volcanic rocks including calc alkaline high-K calc-alkaline shoshonitic and ultrapotasstc products Low-SIO2 and relatively high-MgO mafic volcanic rocks in the region are represented by high-K volcanic rocks (HKVR) in the west where strike-slip tectonics related to the Izmir-Balikesir Transfer Zone dominates while shoshonitic and ultrapotassic volcanic rocks (SHVR and UKVR) occur in the eastern part of the region where mid-crustal units were exhumed along detachment faults during orogenic collapse All three rock groups have nearly identical Sr-Nd Isotope ratios but the SHVR and UKVR are more enriched in incompatible trace elements relative to the HKVR. Comparison of the geochemical characteristics of the most primitive lavas (SiO2<55 wt % Mg#>65 and MgO>6 wt %) provides an important tool in discussing the origin and evolution of the K-rich magmatic activity in this post-orogenic setting