Exhumation of metamorphic rocks in N Aegean: the path from shortening to extension and extrusion

R. Lacassin, N. Arnaud, P. Leloup, R. Armijo, B. Meyer
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引用次数: 12

Abstract

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 nearly coeval with orogenic shortening in the close area. Cooling rates, and likely exhumation, have been low between ~40 Ma and ~20 Ma. 40 Ar/ 39 Ar crystallization ages (between 20 and 15 Ma) appears related to brittle-ductile normal faulting and likely associated with the onset of Aegean back-arc extension. The dating of a diabase dyke, and the geometry of associated brittle jointing, of onshore and offshore active normal faults imply a shift in extension direction after 4 Ma. Such a shift is probably related the propagation of the NAF in northern Aegean known to have occurred around 5 Ma.
爱琴海变质岩的发掘:从缩短到伸展和挤压的路径
奥林波斯-奥萨-佩利翁山脉(OOP)位于爱琴海西北部,环绕着希腊的最高峰,位于北安那托利亚断层(NAF)的末端。OOP范围内的构造和热年代学资料表明,变质推覆体的主要发掘发生在始新世,约43-39 Ma。这一早期掘出与延性-脆性-延性正断裂和东北向搬运有关,与近地造山缩短几乎是同一时期的。40 Ar/ 39 Ar结晶年龄(在20 ~ 15 Ma之间)似乎与脆性-韧性正断层有关,可能与爱琴海弧后伸展的开始有关。辉绿岩脉的年代学和与之相关的陆上和海上活动正断层的脆性节理的几何形状表明,在4 Ma之后,辉绿岩脉的伸展方向发生了转变。这种转变可能与已知发生在5 Ma左右的NAF在爱琴海北部的传播有关。
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