Geology and geochemistry of the pre-Early Cambrian rocks in the Sandikli area; implications for the Pan-African evolution of NW Gondwanaland

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doi: 10.1016/S1342-937X(05)71075-3
Authors:Gursu, Semih; Goncuoglu, M. Cemal; Bayhan, Hasan
Author Affiliations:Primary:
General Directorate of Mineral Research and Exploration, MAT Department, Ankara, Turkey
Middle East Technical University, Turkey
Hacettepe University, Turkey
Volume Title:Gondwana Research
Source:Gondwana Research, 7(4), p.923-935. Publisher: International Association for Gondwana Research, Osaka, Japan. ISSN: 1342-937X
Publication Date:2004
Note:In English. 63 refs.; illus., incl. 1 table, geol. sketch map
Summary:The pre-Early Cambrian Sandikli Basement Complex in western Central Anatolia comprises a low-grade meta-sedimentary succession (Guvercinoluk Formation) and meta-rhyolites intruded by meta-quartz porphyry rocks (Kestel Cayi Porphyroid Suite). The Guvercinoluk Formation consists of alternation of meta-siltstones and meta-sandstones with olistostromal conglomerates, rare black chert and cherty meta-dolomite lenses. The Kestel Cayi Porphyroid Suite is a deformed, highly sheared dome-shaped rhyolitic body with quartz porphyry rocks. Quartz porphyry dykes intrude both the volcanic carapace and the meta-sedimentary rocks of the Guvercinoluk Formation. Both the meta-quartz porphyry rocks and meta-rhyolites are typically mylonitic with relict igneous textures. Geochemical data indicate that the felsic rocks of the Kestel Cayi Porphyroid Suite are subalkaline and display characteristic features of post-collisional, I-type granitoids. The basement complex is unconformably overlain by variegated conglomerates, mudstones and arkosic sandstones with andesitic lavas, followed by siliciclastic rocks and carbonates that yielded Early Middle Cambrian fossils. Based on the geochemical characteristics of the felsic rocks of Kestel Cayi Porphyroid Suite and the depositional features of the associated sediments it is suggested that the Sandikli Basement Complex is related to a post-collisional extension event in NW Gondwanaland. Similar occurrences elsewhere have been related to a transition from continental plate convergence to continental plate divergence along the Pan-African Belt.
Sections:Geochemistry; Petrology
Subsections:Metamorphism: regional, dynamic
Subjects:Basement; Cambrian; Chemical composition; Chemical ratios; Depositional environment; Dikes; Geochemistry; Gondwana; Granites; I-type granites; ICP mass spectra; Igneous rocks; Intrusions; Lithostratigraphy; Low-grade metamorphism; Lower Cambrian; Major elements; Mass spectra; Metamorphic rocks; Metamorphism; Metasedimentary rocks; Metavolcanic rocks; Neoproterozoic; Paleoenvironment; Paleogeography; Paleozoic; Pan-African Orogeny; Petrography; Plutonic rocks; Precambrian; Proterozoic; Reconstruction; Sedimentary rocks; Spectra; Textures; Trace elements; Upper Precambrian; X-ray fluorescence spectra; Anatolia; Asia; Middle East; Turkey; Cal Tepe Formation; Gogebakan Formation; Guvercinoluk Formation; Hudai Formation; Ilyasli Formation; Kestel Cayi Suite; Sandikli Complex; Sandikli Turkey; Seydisehir Formation
Coordinates:N373000 N380000 E0303000 E0293000
Abstract Numbers:04M/4188
Record ID:2005019576
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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