西藏马攸木金矿成矿背景与成矿阶段

Mineralization background and stages of the Mayum gold deposit,Xizang

基于地层、构造、地球化学、同位素年龄等证据,认为马攸木金矿形成于雅江洋盆的消减俯冲-碰撞以来直至现代的地质构造环境,其成矿可分为3个成矿阶段,即古近纪俯冲碰撞期成矿阶段、中新世碰撞后伸展期成矿阶段和晚上新世以来的碰撞后快速隆升成矿阶段。

The Mayum gold deposit in Xizang was generated in the tectonic settings spanning from the subduction and collision of the Yarlung Zangbo oceanic basin to the current tectonism. The ore-forming matter may be derived from the Lower Permian basalts, Late Triassic- Early Cretaceous mantle-derived matter and magmatic rocks of Late Cretaceous or younger, of which the collisional andesite is considered as one of important sources. Three mineralization stages may be separated, including those associated with Paleogene subduction and collision, Miocene post-collisional extension and post-collisional rapid uplifting from the late Pliocene onwards.