AI Summary & Key Takeaways
AI InsightDuctile deformation on the granitic rocks, intra-basinal unconformities and syn-sedimentary deformational structures within the deposits are closely associated with the development of extensional regime during Early Miocene in western Turkey.
📌 3 Key Takeaways
Abstract
The extensional regime in western Anatolia caused the development of metamorphic core complexes, NE and E-W-trending basins and emplacement of magmatic rocks since Late Oligocene and Early Miocene. The Alaçamdağ magmatic complex, which is located to the west of the Simav metamorphic core complex, includes significant data that highlight the style of the extensional regime in western Turkey. It consists of Early Miocene granitic intrusions and volcanic rocks with variable compositions ranging from basalt to rhyolite. The granitic intrusions that were emplaced into the basement rocks of the Menderes Massive and İzmir-Ankara Zone are divided into two facies based on their lithological and textural characteristics: Musalar and Alaçam granites. The Musalar granite has typical holocystalline equigranular texture, while the Alaçam granite is characterised by its porphyritic texture defined by abundant K-feldspar megacrysts. Both granite units were locally transformed into mylonites along shear zones. Volcanic rocks consist of Saðýrlar volcanic unit and felsic volcanic rocks. Sağırlar volcanic unit is made up of andesitic/dacitic intrusions, domes, lava flows, dykes and volcanogenic sedimentary rocks. The felsic volcanic rocks, which unconformably overlies the Saðýrlar volcanic unit, consist of ignimbrite, dacite and rhyolite. These rocks have transitional contacts with alluvial/lacustrine sedimentary deposits. Ductile deformation on the granitic rocks, intra-basinal unconformities and syn-sedimentary deformational structures within the deposits are closely associated with the development of extensional regime during Early Miocene in western Turkey.