Mineralogical and Chemical Characteristics of the Amphibole Minerals From the Metamorphic Sole Rocks of the Late Cretaceous Aged Hatip Ophiolitic Mélange in the Konya Area (Central Southern Turkey)

Abstract

In the Konya area, the Neotethyan assemblage is represented by Late Cretaceous aged Hatıp Ophiolitic Mélange, in where the metamorphic sole rocks crop out as thin slices beneath the sheared serpentinites and harzburgites, and Çayırbağı ophiolite. This study aims to characterize the mineralogical characteristics and chemical composition of the amphiboles in the metamagmatic sole rocks of the Hatıp Ophiolitic Mélange. The main rock types in the metamorphic sole rocks are amphibolite (amphibole up to 90.3 %); epidote-amphibolite (65.3% amphibole); zoisite-amphibolite (amphibole 52.2%) and amphibolequartzite (amphibole 28.5%) with nematoblastic to porphyroblastic texture. The microprobe analyses of the amphiboles suggest that the amphiboles have crystallized from a wet magma in medium pressure condition (≤ 7 kb), and are magnesiohornblende, pargasite and edenite in composition. The obtained data also reveal that the Neotethyan assemblage has experienced a regional metamorphism in greenschist facies conditions, which resulted in no chemical changes in the amphiboles.

10Chemical and Mineralogical Characteristics of the Microscopic-sized Epidotes in the Metamorphic Basement Rocks within the Late Cretaceous Hatip Ophiolitic Melange in Konya (Central Southern Turkey)

“…2), and embays and truncates an optically continuous amphibole, confirming an igneous origin for epidote. [31] suggest that the amphibole in the samples may have igneous origin and crystallized under a medium pressure (≤ 7 kb) based on characteristics of their mineral chemistry. The samples is also characterised by the lack of pyroxene crystals possibly due to high content of water in the magma [32] [33].…”

OUTLINES OF THE ÇAYIRBAĞI OPHIOLITES OF KONYA (CENTRAL ANATOLIA)

“…All of these units were overlied by Hatip Ophiolitic Mélange, which is composed of Carboniferous to Late Cretaceous pelagic limestone, radiolarian cherts, mudstone, harzburgite, gabbro, basalt, diabase, phyllite and talc-schist. The metamorphic sole located at the base of the mélange, is composed of amphibolite, epidote-amphibolite, zoizit-amphibolite, garnet-amphibole schist, amphibole schist, plagioclase amphibole schist, plagioclase-epidote-amphibole schist and q-amphibole schist [13], [15]. and its age is 87-84 Ma [8].…”