Mantle Sources of Recent Anatolian Intraplate Magmatism: A Regional Plume or Local Tectonic Origin?. Issue 12 (15th December 2018)

• Record Type: Journal Article
• Authors: Nikogosian, I. K.; Bracco Gartner, A. J. J.; van Bergen, M. J.; Mason, P. R. D.; van Hinsbergen, D. J. J.
• Is Part Of: Tectonics. Volume 37:Issue 12(2018)
• Page Start: 4535
• Page End: 4566
• Publication Date: 2018-12-15
• Subjects: intraplate magmatism -- Anatolia -- melt inclusions -- primary melt generation -- mantle sources -- geodynamics; Geology, Structural -- Periodicals; 551.8
• DOI: 10.1029/2018TC005219
• Languages: English
• ISSNs: 0278-7407

Abstract

Abstract: We present an extensive study of rehomogenized olivine‐hosted melt inclusions, olivine phenocrysts, and chromian spinel inclusions to explore the link between geodynamic conditions and the origin and composition of Pliocene–Quaternary intraplate magmatism in Anatolia at Kula, Ceyhan‐Osmaniye, and Karacadağ. Exceptional compositional variability of these products reveals early and incomplete mixing of distinct parental melts in each volcanic center, reflecting asthenospheric and lithospheric mantle sources. The studied primitive magmas consist of (1) two variably enriched ocean island basalt (OIB)‐type melts in Kula; (2) both OIB‐type and plume mid‐ocean ridge basalt (P‐MORB)‐like melts beneath Toprakkale and Üçtepeler (Ceyhan‐Osmaniye); and (3) two variably enriched OIB‐type melts beneath Karacadağ. Estimated conditions of primary melt generation are 23–9 kbar, 75–30 km, and 1415–1215 °C for Kula; 28–19 kbar, 90–65 km, and 1430–1350 °C for Toprakkale; 23–18 kbar, 75–60 km, and 1400–1355 °C for Üçtepeler; and 35–27 kbar, 115–90 km, and 1530–1455 °C for Karacadağ, the deepest levels of which correspond to the depth of the lithosphere‐asthenosphere boundary in all regions. Although magma ascent was likely facilitated by local deformation structures, recent Anatolian intraplate magmatism seems to be triggered by large‐scale mantle flow that also affects the wider Arabian and North African regions. We infer that these volcanics form part of a much wider Arabian‐North African intraplate volcanic province, which was able to invade the Anatolian upper plate through slab gaps. Key Points: We present a melt inclusion study of recent primitive Anatolian intraplate magmas at Kula, Ceyhan‐Osmaniye, and Karacadağ Studied magmas indicate mixing of two primary melt components, which reflect asthenospheric and lithospheric mantle sources Anatolian intraplate magmatism seems to be triggered by large‐scale mantle flow that also affects the wider Arabian and North African region