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矿床地质  2006 

青藏高原碰撞造山带:Ⅲ.后碰撞伸展成矿作用

Keywords: 地质学,后碰撞,钾质岩浆岩,成矿作用,深部过程,青藏高原

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Abstract:

“后碰撞”作为大陆碰撞造山作用的特定过程,以其重要的构造演化标示性特征和强烈的爆发式金属成矿作用,受到人们的高度重视。但涉及后碰撞的一系列重要地质问题,如后碰撞期的构造特征与演化历程、岩浆发育序列和岩石构造组合、伸展成矿作用与矿床系列组合等,尚未得到清楚完好的识别、理解和阐示。文章系统研究和总结了青藏高原后碰撞造山与成矿作用特征,提出了后碰撞伸展成矿作用的构造控制模型。研究表明,现今处于后碰撞阶段的青藏高原,中新世以来主要经历了两阶段发育历史。后碰撞早期阶段主要发生下地壳流动与上地壳缩短(>18Ma):下地壳塑性流动并向南挤出,在藏南地区形成EW向延伸的藏南拆离系(STD)和高喜马拉雅,上地壳强烈逆冲推覆,在拉萨地体发育EW向展布的逆冲断裂系;晚期阶段主要发生地壳伸展与裂陷(<18Ma):垂直碰撞带的EW向伸展,形成一系列横切青藏高原的NS向正断层系统(≤13.5Ma)及其围陷的裂谷系和裂陷盆地。后碰撞岩浆作用以形成钾质_超钾质火山岩、钾质埃达克岩、钾质钙碱性花岗岩与淡色花岗岩为特征,集中发育于冈底斯构造_岩浆带和藏南特提斯喜马拉雅。淡色花岗岩与藏南拆离构造有关,其他钾质_超钾质岩浆活动则与EW向地壳伸展有关。青藏高原后碰撞成矿作用强烈而复杂,主要形成斑岩型Cu矿、热液脉型Sb-Au矿、矽卡岩型和热液脉型Ag-Pb-Zn矿以及现代热泉型Cs-Au矿等重要矿床类型。斑岩型Cu矿及矽卡岩型多金属矿床形成于后碰撞伸展环境,岩浆起源于加厚的镁铁质新生下地壳;热液脉型Sb-Au矿发育于藏南拆离带及变质核杂岩周围,系中新世地热田浅成低温热液活动产物。热液脉型Ag-Pb-Zn矿主要产于拉萨地体内部的逆冲构造带内,与地壳流体的迁移汇聚过程有关。青藏高原后碰撞成矿作用在上地壳层次受3大构造系统控制,即①东西向伸展形成的近NS向正断层系统及裂谷裂陷带,②南北向地壳缩短形成的EW向展布的逆冲构造带和③EW向展布的拆离构造带,但在中下地壳/地幔层次上,则受中下地壳物质流动_挤出过程以及俯冲大陆板片断离_拆沉过程控制。

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