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地球学报  2002 

青藏高原北缘中生代伸展构造^40Ar/^39Ar测年和MDD模拟

Keywords: 青藏高原北缘,阿尔金山,拉配泉断裂,40Ar/39Ar测年,MDD模拟

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Abstract:

沿着青藏高原北缘的阿尔金山脉东段,发育了长度大于300km、EW走向的拉配泉断裂。中美合作阿尔金课题组的地质填图结果表明,该断层实际上是一条南倾的正断层,局部倾角可以低至30°以下。沉积学和热年代学研究控制了拉配泉断裂的活动时代:早—中侏罗统地层可以解释为断裂上盘的伸展盆地沉积;下盘岩石中钾长石40Ar/39Ar测年和MDD模拟给出2个阶段的冷却事件,早期事件出现在约220~187Ma之间,晚期事件出现在早白垩世晚期(约100Ma)。早期事件代表了拉配泉断裂正断作

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