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

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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

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Department of Geological Engineering, Conference / Seminar

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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.