滇西羊拉铜矿床、鲁春铜铅锌矿床构造控矿特征

Characteristics of Ore-Controlling Structures in the Yangla Copper Deposit and Luchun Cu-Pb-Zn Deposit, Western Yunnan

羊拉铜矿床、鲁春铜铅锌矿床位于金沙江成矿带的中部。羊拉铜矿床铜是三江地区典型的大型铜矿床,其赋矿围岩为不同岩性的岩石组成的混杂堆积,容矿构造为缓倾的逆断层和陡倾的正断层;鲁春铜铅锌矿床受到逆断层的控制。通过对4个测点共轭剪节理的研究,表明里农矿段KT2、KT5矿体的古构造应力场最大主应力方向为东西向和北东-南西向,里农矿段、江边矿段花岗闪长岩体的古构造应力场最大主应力方向为北东-南西向。

The Yangla copper deposit and Luchun Cu-Pb-Zn deposit are located in the middle section of Jinshajiang metallogenic belt. The Yangla copper deposit, which is a representive copper deposit in the Jinshajiang-Laneangjiang-Nujiang region, hosts an estimated Cu reserve of about 1.2 × 10^6 tons. The orebodies are hosted in the melange composed of diverse rocks. The ores were deposited in pre-existing thrust faults in Indosinian period and steeply dipping normal fault in Himalayan period. The directions of the maximum principal stress were E-W and NE-SW in the Yangla deposit. E-W direction was related to the westwards subduction of the Jinshajiang Oceanic plate in Indosinian, NE-SW related to the collision between India plate and Asia plate in Himalayan. The Luchun Cu-Pb-Zn deposit is bordered by the Indosinian thrust fault.