Surface characteristics, mineralogy and geochemistry of the gicik low–sulfidation epithermal au deposit (Ankara province, central anatolia)

Download

index.pdf

Date

2019

Author

Çil, Akın

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

820
views

412
downloads

Tethyan-Eurasian Metallogenic Belt was formed as a result of the Mesozoic-Cenozoic Alpine-Himalayan orogeny related to the opening and closure of the Tethyan ocean basins. Turkey forms a sector of this extensive belt, and hosts numerous precious and base metal deposits. Gicik Au mineralization is located at Sakarya zone and approximately 15 km north of Ankara. Gold mineralization is hosted within Middle Eocene (ca. 44 Ma) intermediate composition dacitic lavas and agglomerates that are widely exposed near Ankara, and unconformably overlying the Paleozoic metamorphic basement. Whole-rock geochemical analyses of volcanic rocks indicate that the volcanism is metaluminous, medium-K calc-alkaline in composition and related to subduction and post-collisional tectonic setting. Lithogeochemical and geochronological data strongly implies that the studied volcanic rocks belong to the earlier (Eocene) eruptive volcanic event at the north of Ankara which was followed by volcanic rocks of Galatean Volcanic Province (Miocene). These volcanic lithologies are cut by NNE–trending 2 to 10 meters thick siliceous veins that display stockwork, colloform banding and superimposed breccia textures or less commonly bladed textures. Main ore minerals in the Gicik area includes argentiferous tetrahedrite, pyrite and arsenopyrite. Alteration assemblages include widespread epidote-chlorite with less common calcite (propylitic), argillic (kaolinitesericite/illite-smectite-quartz-adularia) and silicification. 40Ar/39Ar age data obtained from sericite in Gicik deposit yielded age of 45 – 47 Ma suggesting synchronous formation of volcanism and mineralized system. Central Anatolia is remained relatively underexplored when compared to the eastern and western parts of the Eocene magmatic belt across the north of İzmir-Ankara-Erzincan suture. Presence of Eocene volcanism related Gicik mineralization in central Anatolia puts entire magmatic belt in a position potential to especially precious metal mineralization.

Subject Keywords

Geology, Stratigraphic, Geology, Stratigraphic Cenozoic., Central Anatolia, Ankara, Gicik, Cenozoic Volcanism, Low–Sulfidation Epithermal Gold.

URI

http://etd.lib.metu.edu.tr/upload/12623865/index.pdf
https://hdl.handle.net/11511/44046

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Geological evolution of the gediz graben, sw turkey: temporal and spatial variation of the graben Çiftçi, Bozkurt N; Bozkurt, Erdin; Department of Geological Engineering (2007) Gediz Graben is a continental extensional basin filled with Neogene sediments. Its margins are controlled by active ~EW-trending fault systems with major system, in terms of total offset and duration of activity, located along the southern margin. The graben evolved as a half graben by the activity of the southern margin during the entire Miocene. Then, the northern margin-bounding structure initiated by PlioQuaternary to form the current configuration of the graben with an inherited asymmetry. The southern...
Surface expression of eastern Mediterranean slab dynamics: Neogene topographic and structural evolution of the southwest margin of the Central Anatolian Plateau, Turkey Schildgen, T. F.; Cosentino, D.; Caruso, A.; Buchwaldt, R.; Yildirim, C.; Bowring, S. A.; Rojay, Fuat Bora; Echtler, H.; Strecker, M. R. (2012-03-16) The southwest margin of the Central Anatolian Plateau has experienced multiple phases of topographic growth, including the formation of localized highs prior to the Late Miocene that were later affected by wholesale uplift of the plateau margin. Our new biostratigraphic data limit the age of uplifted marine sediments at the southwest plateau margin at 1.5 km elevation to <7.17 Ma, and regional lithostratigraphic correlations imply that the age is <6.7 Ma. Single-grain CA-TIMS U-Pb zircon analyses from a rew...
Petrochemistry of the Oyaca-Kedikayasi (Ankara) dacites as evidence for the post-collisional tectonic evolution of north-central Anatolia, Turkey Bozkurt, Erdin; Winchester, JA; Holland, G; Beyhan, A (Wiley, 1999-07-01) The Lower Miocene Oyaca and Kedikayasi dacite stocks, unconformably overlain by Plio-Quaternary sedimentary and volcanic rocks, intrude a southward-verging imbricate thrust zone within the izmir-Ankara-Erzincan Suture Zone (IAESZ), approximately 50 km SW of Ankara. These stocks crop out as two petrographically distinguishable plagioclase, hornblende and biotite-phyric dacites. Xenoliths petrographically similar to the Kedikayasi dacite occur within the Oyaca stock, suggesting that the Kedikayasi stock is ol...
Sub-ophiolite metamorphic rocks from NW Anatolia, Turkey Onen, AP; Hall, R (Wiley, 2000-09-01) The metamorphic rocks from near Kutahya in north-west Anatolia record different stages in the history of closure of the Neo-Tethyan Izmir-Ankara-Erzincan ocean. Sub-ophiolite metamorphic rocks within the Tavsanli zone are a tectonically composite sequence of quartz-mica schists, amphibole schists, amphibolites and garnet amphibolites. They show increasing metamorphic grade towards the base of the ophiolite. A first metamorphic event, typical of sub-ophiolite metamorphic sole rocks, was characterized by high...
Rapid cooling history of a Neotethyan ophiolite: Evidence for contemporaneous subduction initiation and metamorphic sole formation PARLAK, OSMAN; Dunkl, Istvan; KARAOĞLAN, FATİH; Kusky, Timothy M.; Zhang, Chao; Wang, Lu; Koepke, Juergen; Billor, Zeki; Hames, Willis E.; ŞİMŞEK, EMRAH; Simsek, Gokce; ŞİMŞEK, TUĞÇE; Ozturk, Selena Ezgi (Geological Society of America, 2019-11-01) The Beywhir-Hoyran Nappes, including Mesozoic carbonate platform rocks, deepsea sediments, and ophiolite-related units, crop out extensively on the western limb of the Isparta Angle in the Central Taurides, Turkey. The ophiolite-related rocks are represented by variably serpentinized harzburgitic mantle tectonites, tectonically underlain by a subophiolitic metamorphic sole and melange. The harzburgitic mantle tectonites and metamorphic sole are intruded by undeformed isolated dikes. Protoliths of the metamo...

Citation Formats

A. Çil, “Surface characteristics, mineralogy and geochemistry of the gicik low–sulfidation epithermal au deposit (Ankara province, central anatolia),” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Geological Engineering., Middle East Technical University, 2019.