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地质学报  2005 

西昆仑西段三叠纪两类花岗岩年龄测定及其构造意义

, PP. 645-652

Keywords: 西昆仑,三叠纪花岗岩,锆石U-PbSHRIMP年龄,构造特征,构造意义

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Abstract:

西昆仑造山带海西晚期-印支早期(三叠纪)花岗岩发育,但已有的测年资料、岩石地球化学研究及少量的构造学观察还没有对本区这一时期造山事件的时间尺度做到准确把握。对西昆仑西段海西晚期两类构造特征完全不同的花岗岩露头尺度的观察、锆石U-Pb定年结果表明,一类含石榴子石片麻状花岗岩形成时代为240.5±1.8Ma,表现出同造山过程中的花岗岩变形特征;另一类块状含角闪石花岗岩的年龄为228.2±1.5Ma。根据两个岩体的构造特征,结合前人的研究及地球化学特征,表明含石榴子石片麻状花岗岩形成于同碰撞造山时期,是甜水海地体与西昆仑南带晚古生代岛弧沿麻扎-康西瓦缝合带碰撞峰期的产物,代表了沿麻扎-康西瓦分布的古特提斯洋一个分支的闭合,而228Ma块状含角闪石花岗岩形成于碰撞造山后的伸展背景。220-190Ma持续发育的花岗岩是南昆仑地体拼合到北昆仑地体之后在其南部形成的新的深成岩浆弧带。这一研究为西昆仑海西晚期-印支早期构造演化提供了更精细的时间制约。

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