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The syn‐collisional Danacıobası biotite leucogranite derived from the crustal thickening in central Anatolia (Kırıkkale), Turkey
Author(s) -
Tatar Si̇bel,
Boztuǧ Durmuş
Publication year - 2005
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.1027
Subject(s) - leucogranite , biotite , quartz monzonite , geochemistry , geology , felsic , mafic , zircon , pluton , plagioclase , anatexis , partial melting , petrology , metamorphic rock , gneiss , quartz , basalt , paleontology , tectonics
Abstract The Behrekdağ composite batholith, which crops out as a huge N–S‐trending plutonic body in central Anatolia, Turkey, consists of five mappable granitoid units of Late Cretaceous age. They are (1) the S‐type, peraluminous Danacıobası biotite leucogranite, (2) the I‐type, hybrid, metaluminous Konur K‐feldspar megacrystic quartz monzonite, (3) the mafic A‐type, alkaline Kizdede monzogabbro, (4) the felsic A‐type, alkaline Hasandede quartz syenite/monzonite, and (5) the M‐type, low‐K tholeiitic Yeniköy tonalite. The S‐type Danacıobası biotite leucogranite constitutes the oldest intrusive unit in the mapped area. It has coarse‐ to medium‐crystalline texture and consists of quartz, orthoclase and plagioclase, with variable amounts of biotite and accessory minerals, including apatite, zircon and opaque phases. K‐Ar age dating of biotite separates, yields cooling ages of 69.1 ± 1.42 and 71.5 ± 1.45 Ma for the Danacıobası biotite leucogranite. Major‐element, trace‐element, and rare‐earth element geochemical data suggest an exclusively peraluminous, S‐type, high‐K calc‐alkaline, upper crustal genesis for the Danacıobası biotite leucogranite. This petrogenetic interpretation is also supported by oxygen‐isotope data from quartz separates, with a mean value of 10.58 ± 0.11 ‰ of δ 18 O VSMOW value. The magma source of the Danacıobası biotite leucogranite is proposed to have been a syn‐collisional leucogranitic melt derived by anatexis of high‐grade metasediments of the Central Anatolian Crystalline Complex during peak conditions of regional metamorphism. This metamorphic event was induced by crustal thickening which was a result of Late Cretaceous collision between the Eurasia and Tauride–Anatolide Platform along the İzmir–Ankara–Erzincan Suture Zone in central Anatolia. Copyright © 2005 John Wiley & Sons, Ltd.