Ar-40-Ar-39 dating, whole-rock and Sr-Nd-Pb isotope geochemistry of post-collisional Eocene volcanic rocks in the southern part of the Eastern Pontides (NE Turkey): implications for magma evolution in extension-induced origin


ARSLAN M. , TEMİZEL İ. , Abdioglu E. , KOLAYLI H. , Yucel C., Boztug D., ...More

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, vol.166, no.1, pp.113-142, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 166 Issue: 1
  • Publication Date: 2013
  • Doi Number: 10.1007/s00410-013-0868-3
  • Title of Journal : CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • Page Numbers: pp.113-142
  • Keywords: Post-collisional volcanics, Petrology, Isotope geochemistry, Dating, Delamination, Geodynamic evolution, Extension, Pontides, Turkey, CRUST-MANTLE INTERACTION, ULUBEY ORDU AREA, TRACE-ELEMENT, CALC-ALKALINE, CENTRAL ANATOLIA, WESTERN ANATOLIA, SLAB BREAKOFF, BLACK-SEA, CHEMICAL CHARACTERISTICS, NEOTETHYAN CONVERGENCE

Abstract

The Eocene volcano-sedimentary units in the southern part of the Eastern Pontides (NE Turkey) are confined within a narrow zone of east-west trending, semi-isolated basins in Bayburt, GumuAYhane, Airan and Alucra areas. The volcanic rocks in these areas are mainly basalt and andesite through dacite, with a dominant calc-alkaline to rare tholeiitic tendency. Ar-40-Ar-39 dating of these volcanic rocks places them between 37.7 +/- A 0.2 and 44.5 +/- A 0.2 Ma (Middle Eocene). Differences in the major and trace element variations can be explained by the fractionation of clinopyroxene +/- A magnetite in basaltic rocks and that of hornblende + plagioclase +/- A magnetite +/- A apatite in andesitic rocks. Primitive mantle-normalized multi-element variations exhibit enrichment of large-ion lithophile elements and to a lesser extent, of light rare earth elements, as well as depletion of high field strength elements, thus revealing that volcanic rocks evolved from a parental magma derived from an enriched mantle source. Chondrite-normalized rare earth element patterns of the aforementioned volcanic rocks resemble each other and are spoon-shaped with low-to-medium enrichment (La-N/Lu-N = 2-14), indicating similar spinel lherzolitic mantle source(s). Sr, Nd and Pb isotopic systematics imply that the volcanic rocks are derived from a subduction-modified subcontinental lithospheric mantle. Furthermore, post-collisional thickened continental crust, lithospheric delamination and a subduction-imposed thermal structure are very important in generating Tertiary magma(s). The predominantly calc-alkaline nature of Eocene volcanic rocks is associated with increasing geodynamic regime-extension, whereas tholeiitic volcanism results from local variations in the stress regime of the ongoing extension and the thermal structure, as well as the thickness of the crust and the mantle-crust source regions. Based on volcanic variety and distribution, as well as on petrological data, Tertiary magmatic activity in Eastern Pontides is closely related to post-collisional thinning of the young lithosphere, which, in turn, is caused by extension and lithospheric delamination after collisional events between the Tauride-Anatolide Platform and the Eurasian Plate.