Timing of post-obduction granitoids from intrusion through cooling to exhumation in central Anatolia, Turkey

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• 作者：D. Boztuğ ; R.C. Jonckheere ; M. Heizler ; L. Ratschbacher ; Y. Harlavan ; M. Tichomirova
• 关键词：²⁰⁷Pb– ; ²⁰⁶Pb ; ⁴⁰Ar– ; ³⁹Ar ; K– ; Ar ; Fission-track ; Collision ; Central Turkey
• 刊名：Tectonophysics
• 出版年：2009
• 出版时间：20 July 2009
• 年：2009
• 卷：473
• 期：1-2
• 页码：223-233
• 全文大小：2411 K

文摘

The Middle to Late Cretaceous central Anatolian granitoids intrude the supra-subduction zone-type central Anatolian ophiolite and medium- to high-grade metasediments of central Anatolian crystalline complex and are overlain by Late Palaeocene to Early/Middle Eocene sediments. Their single-zircon ²⁰⁷Pb–²⁰⁶Pb evaporation ages define three clusters: (1) Cenomanian–Turonian (weighted-mean age: 94.9 ± 3.4 Ma), (2) Turonian–Santonian (85.5 ± 5.5 Ma) and (3) Campanian (74.9 ± 3.8 Ma). Their hornblende and biotite ⁴⁰Ar–³⁹Ar and K–Ar cooling ages cluster around 80–65 Ma. The close hornblende and biotite ages reflect rapid exhumation of a mid-crustal section during the Campanian–Maastrichtian. Early to Middle Palaeocene (57–62 Ma) apatite fission-track age clusters date the tail end of this exhumation episode. It is proposed that the central Anatolian granitoid melts were generated in a post-collisional extensional setting following the docking of an oceanic island arc onto the Tauride–Anatolide platform. Campanian–Maastrichtian to Early/Middle Palaeocene rapid exhumation event is considered to result from continent–continent collisions between Eurasian plate and the Tauride–Anatolide platform along the İzmir–Ankara–Erzincan suture zone.