Magmatic processes and mixing origin of andesite: Miocene Karamagara volcanics, central Anatolia, Turkey

Alpaslan M., Ekici T. , Otlu N. , Boztug D., Temel A.

GEOLOGICAL JOURNAL, vol.40, no.2, pp.193-214, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 2
  • Publication Date: 2005
  • Doi Number: 10.1002/gj.1002
  • Title of Journal : GEOLOGICAL JOURNAL
  • Page Numbers: pp.193-214


The Miocene Karamagara volcanics (KMV) crop out in the Saraykent region (Yozgat) of Central Anatolia. The KMV include four principal magmatic components based on their petrography and compositional features: basaltic andesites (KMB); enclaves (KME); andesites (KMA); and dacites (KMD). Rounded and ellipsoidal enclaves occur in the andesites, ranging in diameter from a few millimetres to ten centimetres. A non-cognate origin for the enclaves is suggested due to their mineralogical dissimilarity to the enclosing andesites. The enclaves range in composition from basaltic andesite to andesite. Major and trace element data and primitive mantle-normalized rare-earth element (REE) patterns of the KMV exhibit the effects of fractional crystallization on the evolution of the KME which are the product of mantle-derived magma.