四川九龙黑牛洞铜矿床地质特征及其外围找矿方向初探

Geology and new perspectives of the Heiniudong copper deposit and its surrounding areas in Jiulong,Sichuan

摘要: 形成于燕山期的黑牛洞铜矿分布在江浪变质核杂岩的伸展型韧性剪切带内,变基性火山岩附近矿化和蚀变强烈。伸展型韧性剪切带晚期具有张性或张扭性断裂叠加的构造特征。黑牛洞铜矿似属韧性剪切带型铜矿,其成矿物质具有多来源、成矿作用具有多期次、矿床具有多成因的特点,而最终使其成为富铜矿的重要控矿因素则是燕山期的伸展型韧性剪切作用及其晚期的脆性断裂叠加。建议找矿在伸展型韧性剪切带内,有变基性火山岩发育,矿化、蚀变显示良好,晚期叠加张性或张扭性断裂的有利地段展开。

Abstract: The Heiniudong copper deposit formed during the Yanshanian is hosted in the extensional ductile shear zones of the Jianglang metamorphic core complexes. The metabasic volcanic rocks within the copper deposit have been highly mineralized and altered. The extensional ductile shear zones display the structural features of extensional or tenso-shear faulting. The copper deposit is likely to be the ductile shear zone type, and polyphyletic, polyphase and polygenetic. The controlling factors include the Yanshanian extensional ductile shearing and late brittle faulting. Further exploration should be expected for the extensional ductile shear zones where the metabasic volcanic rocks are well developed, mineralized, altered, and associated with late extensional or tenso-shear faulting.