兰坪盆地演化与成矿特征

The Evolution and the Metallogenic Characteristic of Lanping Basin

兰坪盆地的演化受控于盆地所处的构造背景,经历了中三叠世至早侏罗世的陆内裂谷盆地、中-晚侏罗世的拗陷盆地、白垩纪的前陆盆地、古新世-中新世的走滑盆地。盆内成矿与盆地性质密切相关,陆内裂谷盆地阶段是重要的成矿期,具热水沉积矿床特征;拗陷盆地阶段多形成铜多金属矿床;前陆盆地阶段为喜山期的成矿作了物质准备;走滑盆地阶段,由于推覆构造活动强烈,深部流体和浅部红层中的盆地流体的混合,提供了大量的矿物质,并就位于构造圈闭中,形成如金顶铅锌矿等大型矿床。

The evolution of Lanping Basin is subjected to its tectonic background, which experienced intracontinental rift basin stage from Middle Tri- assic to Early Jurassic, depression basin stage from middle to late Jurassic, Foreland basin in Cretaceous and Strike-slip basin from Palacocene to Mio- cene. Mineralization was Closely related to the Basin nature, the intracontinental rift basin stage was the important mineralogenetic epoch, the mineral de- posit structure with the character of hydrothermal ore deposit. The copper polymetallic deposit was formed during the depression basin stage. It was pre- pared for Ore-forming materials to Himalayan phase during Foreland basin stage. Because of strongly nappe tectonic movement, the fluid that came frmn deep-seated and superficial Red Beds was mixed. So,it had provided a lot of ore-forming materials and formed large-scale ore deposit such as JinDing lead-zinc ore deposit located in the structural trap.