王家店—天合兴金铜矿带地质构造背景

TECTONIC SETTING OF THE WANGJIADIAN-TIANHEXING GOLDCOPPER BELT, JiLIN PROVINCE

王家店—天合兴金铜矿带区域为太古代高级变质区,矿带分布于穹隆一盆地体系之间近南北向的韧性剪切带中,中生代以后,本区地壳受到拉张,地幔物质沿韧性剪切带上涌,形成王家店—天合兴酸性—偏碱性浅成侵入岩群。金、铜矿化成因上与该期岩浆岩有关。该带地球物理场以重力低、磁力低为特征,说明深部存在异常地幔带,它控制了浅层的构造岩浆作用和成矿作用。

The Wangjiadian—Tianhexing Au—Cu belt is distributed in the SN-trending ductile shear zone between the dome and basin in the Archaean highgrade metamorphic area. After the Mesozoic, the crust in this area was influenced by tension and the materials from the mantle intruded upward to form the Wangjiadain-Tainhexing acid-alkali hypabyssal intrusive rock swarm. The mineralization of gold and copper is related originally to the magmatic rocks in this stage. The geophysical field in this area is characterized by gravity low and magnetics low, indicating that the hypabyssal tectonic-magmatism and oreforming process are controlled by the deep abnormal mantle.