Intrusive products of H2O and CO2 rich alkaline melt (Karakoç Magmatic Association): Significance in tethyan realm, Turkey

Date

2012-10-01

Author

Toksoy Köksal, Fatma

Metadata

Show full item record

Item Usage Stats

192
views

0
downloads

The Karakoç Magmatic Association (KMA) within the Central Anatolian Crystalline Complex (CACC) consists of ultramafic cumulates, layered gabbros and diorite. The KMA intruded the carbonate dominated upper part of the CACC as a network and includes host rock xenoliths. The KMA is characterized by abundance of Ca-rich phases (green diopside (Mg#=57-93), pargasite (Mg#=41-86), plagioclase (An=91-95), scapolite (Me=42-92), calcite) and Ca-free minerals (phlogopite (Mg#=71-76), alkali-feldspar). The accessories are apatite, sphene, rutile, zircon, and Fe-oxides. Scapolite and calcite are in textural equilibrium with surrounding silicates, inferring magmatic origin. The KMA, with low SiO2 and high CaO, Na2O, K2O, H2O, CO2 contents, has high-K alkaline nature. The rocks display positive Th, U, K, Pb, P and negative Nb, Ta, Ti, Zr anomalies on the primitive mantle normalized spider diagrams. The rocks enriched in REE (REE=179-673) show sloped pattern from LREE to HREE. The KMA is characterized by low εNd(T) values [(-2.2) – (-6.2)] and moderate to high initial 87Sr/86Sr isotope ratios (0.707262 – 0.707864). Geochemically, the KMA is strongly comparable with the Late Cretaceous monzonitic I- and A-type granitoids, and also shows similarities to the Late Cretaceous to Lower Tertiary alkaline and ultrapotassic volcanic rocks within the CACC. The KMA is assumed to be product of a hydrous mafic magma generated in a post-collisional extensional setting during the Late Cretaceous. Release of CO2 in an extensional setting is likely to cause extensive assimilation of crustal carbonate in liquid state and increase in alkalinity and desilicification of the host magm

Subject Keywords

Karakoç, Hydrous alkaline magma, Carbonate assimilation

URI

https://hdl.handle.net/11511/87357
http://iesca.deu.edu.tr/ocs/index.php/iesca/2012/schedConf/presentations?searchInitial=K&track=0

Conference Name

IESCA 2019 : International Earth Science Colloquium On the Aegean Region , October 7-11 2019

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Extrusive members of postcollisional A-type magmatism in Central Anatolia: Karahidir Volcanics, Idis Dagi-Avanos Area, Turkey Koksal, S; Göncüoğlu, Mehmet Cemal; Floyd, PA (2001-08-01) The Idis Dagi Igneous Complex is one of a number of late-stage plutonic bodies within the Central Anatolian Crystalline Complex. It intrudes Paleozoic-Mesozoic metamorphic basement rocks and Late Cretaceous granitoids. The complex comprises mainly quartz syenites and alkali-feldspar quartz syenites known as the Idis Dagi Syenitoids.
Eocene post collisional volcanism in the Central Anatolian Crystalline Complex Turkey Petrology and geodynamic significance Geneli, Fatma; Göncüoğlu, Mehmet Cemal; Lassıter, J; Toksoy Köksal, Fatma (null; 2010-09-04) In the Central Anatolian Crystalline Complex (CACC) the Late Cretaceous postcollisional granitic magmatism is followed by Eocene extension, resulting in formation of roughly E-W trending transtensional basins. The volcanic rocks, mainly submarine lava flows and subareal domes are concentrated along these Middle Eocene (Bartonian) basins. The volcanic rocks are basic to intermediate and are classified as basalt, basaltic andesite and rarely alkali basalt and trachy-andesite. Petrographically they are general...
Late Middle Jurassic (Late Bathonian-early Callovian) radiolarian cherts from the Neotethyan Bornova flysch zone, Spil Mountains, Western Turkey TEKİN, UĞUR KAĞAN; Göncüoğlu, Mehmet Cemal (2009-06-01) Alternating radiolarian cherts and mudstones associated with basaltic lavas occur in a olistolith within the Late Cretaceous Bornova Flysch in W Anatolia. Cherts yielded diverse and moderately preserved, Nassellaria-dominated radiolarian faunas of late Bathonian-early Callovian age. Associated volcanic rocks are geochemically classified as remnants of oceanic seamounts. This is so far the first late Middle Jurassic age from the crust of the Neotethyan Izmir-Ankara Ocean in W Anatolia, and suggests that its ...
Structural interpretation of gabbroic rocks in Agacoren Granitoid, central Turkey: field observations and aeromagnetic data Kadioglu, Yk; Ates, A; Güleç, Nilgün Türkan (1998-03-01) Gabbroic rocks crop out commonly in different localities of the Central Anatolian Crystalline Complex and are interpreted by many researchers as the remnants of a Neotethyan ophiolitic suite now observed as roof-pendants in the granitoids of the complex. In this study, the structural position of the gabbroic rocks within one of the granitoids of the Central Anatolian Crystalline Complex, namely the Agacoren Granitoid, is determined by geological and aeromagnetic data from the central part of the pluton. The...
Hydrous aluminosilicate metasomatism in an intra-oceanic subduction zone: Implications from the Kurancali (Turkey) ultramafic-mafic cumulates within the Alpine Neotethys Ocean Toksoy Köksal, Fatma; Göncüoğlu, Mehmet Cemal (2009-03-01) The Kurancali ultramafic-mafic cumulate body, an allochthonous ophiolitic sliver in central Anatolia, is characterized by the presence of abundant hydrous phases (phlogopite, pargasite) besides augitic diopside, plagioclase, and accessory amounts of rutile, sphene, apatite, zircon, and calcite. Based on modes of the essential minerals, the olivine-orthopyroxene-free cumulates are grouped as clinopyroxenite, hydrous clinopyroxenite, phlogopitite, hornblendite, layered gabbro, and diorite. Petrographical, min...

Citation Formats

F. Toksoy Köksal, “Intrusive products of H2O and CO2 rich alkaline melt (Karakoç Magmatic Association): Significance in tethyan realm, Turkey,” presented at the IESCA 2019 : International Earth Science Colloquium On the Aegean Region , October 7-11 2019, Izmir, Turkey, 2012, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/87357.