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Syn- and post-orogenic exhumation of metamorphic rocks in North Aegean

机译：北爱琴海变质岩的同生和造山后发掘

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摘要

The Olympos-Ossa-Pelion (OOP) ranges, in NW Aegean, encompass Greece highest summit and are located near the extremity of the North Anatolian Fault (NAF). Structural and thermochronological data gathered in the OOP ranges show that the main exhumation of metamorphic nappes occurred in the Eocene, at ca. 43–39 Ma. This early exhumation, associated with ductile, then brittle-ductile normal faulting with northeastward transport, is coeval with orogenic shortening in the close area. Cooling rates, and likely exhumation, have been low between ~40 Ma and ~20 Ma. 40Ar/39Ar crystallization ages (between 20 and 15 Ma) appears related to brittle-ductile normal faulting and likely associated with Neogene Aegean back-arc extension. The dating of a diabase dyke, and the geometry of associated brittle jointing, of onshore and offshore active normal faults suggest a shift in extension direction after 4Ma, possibly in relation with the propagation of the NAF in northern Aegean.
机译：位于爱琴海西北部的Olympos-Ossa-Pelion（OOP）山脉涵盖希腊最高峰，并位于北安纳托利亚断层（NAF）的末端附近。在OOP范围内收集到的结构和热年代学数据表明，变质尿布的主要掘出发生在始新世，大约在。 43-39马。这种早期发掘与向东北输送的韧性的，然后脆性的韧性断层有关，同时伴随着造山带的缩短。冷却速度以及可能的发掘一直在〜40 Ma和〜20 Ma之间较低。 40Ar / 39Ar结晶年龄（介于20和15 Ma之间）似乎与脆性-韧性正常断裂有关，并且可能与Neogene Aegean弧后伸展有关。辉绿岩堤的年代以及陆上和海上活动正断层的脆性节理的几何形状表明，在4Ma之后，延伸方向发生了变化，这可能与爱琴海北部NAF的传播有关。

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