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海南公爱NW向韧性剪切带构造特征及其40Ar?39Ar年代学约束

, PP. 312-319

Keywords: NW向韧性剪切带,Ar?Ar年代学,海南岛公爱地区

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Abstract:

在海南岛西部公爱地区识别出NW向韧性剪切带,其野外构造解析和显微构造分析表明,公爱NW向韧性剪切带早期为右旋剪切,变形温度约300~450℃。对该韧性剪切带糜棱岩样品中白云母单矿物的40Ar?39Ar定年结果表明:样品04HN17和04HN18分别给出了250.0±1.0Ma和248.0±1.0Ma的40Ar/39Ar坪年龄,为印支早期变形产物。海南公爱NW向韧性剪切带变形运动学和变形时序与印支北部NW向韧性剪切带(如Song?Ma地区)具有很好的一致性,这为理解公爱地区早中生代构造演化及华南陆块和印支半岛印支期构造演化提供了新的信息。

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