Polybaric melting of a single mantle source during the Neogene Siverek phase of the Karacadağ Volcanic Complex, SE Turkey
| Autor: | Taner Ekici, Colin G. Macpherson, Nazmi Otlu |
|---|---|
| Přispěvatelé: | Ekici, T., Department of Geological Engineering, University of Cumhuriyet, 58140, Sivas, Turkey -- Macpherson, C.G., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom -- Otlu, N., Department of Geological Engineering, University of Cumhuriyet, 58140, Sivas, Turkey |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Lithos, 2012, Vol.146-147, pp.152-163 [Peer Reviewed Journal] |
| Popis: | Siverek plateau basalts represent the Neogene activity of the Karacada? Volcanic Complex in southeast Turkey and can be divided into two groups based on incompatible element concentrations. Group 1 is largely basaltic, containing some alkali basalts, while Group 2 consists of alkali basalts, trachybasalts and tephrites. The lavas display a range in major element concentrations that are consistent with restricted amounts of differentiation in the crust. Melts from both groups have experienced variable, small amounts of interaction with crustal rocks, which is responsible for most of the isotopic heterogeneity and caused significant Ba-enrichment. Neither fractional crystallisation nor crustal contamination can account for the differences in trace element enrichment observed between the two groups. Group 1 is derived mainly from the spinel lherzolite field by > 1% partial melting. Group 2 lavas were derived from very similar mantle but by smaller degrees of melting and contain a larger relative contribution from garnet-lherzolite. The Siverek plateau lavas are indistinguishable from contemporaneous magmatism in the Karasu Valley of southern Turkey and in northernmost Syria. Together, these plateau basalt fields represent mantle upwelling and melting beneath the thinned and/or weakened Arabian Plate as it migrated northwards during the Neogene. © 2012 Elsevier B.V. 107Y025 Taner Ekici acknowledges financial support from TUBITAK (Project No. 107Y025 ) to conduct fieldwork and analytical work. Mehmet Ülkü of MTA Diyarbakır supported fieldwork in SE Turkey. Discussion with Gillian Foulger was valuable in refining a number of concepts discussed. Kurt Knesel and an anonymous reviewer provided very constructive and helpful reviews. Colin Macpherson is grateful to Durham University for a period of research leave. Appendix A Ekici, T.; Department of Geological Engineering, University of Cumhuriyet, 58140, Sivas, Turkey; email: tanere7@gmail.com |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|