四川里伍铜矿田控矿构造特征与找矿方向

摘要

The Liwu copper orefield is hosted in the domal structures of the Jianglang metamorphic core complexes on the western margin of the Yangtze platform, where seven medium- to small-sized copper deposits such as the Liwu and Heiniudong copper deposits have been delineated up to now. The emplacement, occurrence and sizes of copper orebodies are controlled by the structural associations composed of the metamorphic core complex domes and associated ductile shear-decollement zones on the basis of the integration of geology, ore-controling factors and ore-controling structures in the orefield. The copper deposits commonly occur as vein, lenticular and stratoid deposits filled-replaced along the ductile shear-decollement zones of the metamorphic core complex domes where larger metallogenic and accommodation spaces are favourable for the formation of larger-sized copper deposits. Therefore, the ductile shear-decollement zones of the metamorphic core complex domes are believed to be the main ore-controling structures in the Liwu copper orefield. Future targets for the further prospecting and exploration should be concentrated in the Liwu copper orefield and its surrounding areas similar to the Jianglang metamorphic core complex domes on the western margin of the Yangtze platform.%里伍铜矿田位于扬子地台西缘江浪变质核杂岩穹隆构造中.现已发现里伍、黑牛洞等中小型铜矿床7处,为扬子地台西缘地区铜矿集中产出区之一.中深构造层次的江浪变质核杂岩构成了矿区构造主体.通过对里伍铜矿田内矿床的地质特征、控矿因素和控矿构造特征等的系统研究表明,矿田中由变质核杂岩穹隆构成的构造组合及其韧性剪切滑脱带控制了铜矿体的定位、形态以及矿床的规模.变质核杂岩穹隆中的韧性剪切滑脱带是主要控矿构造.在综合研究的基础上,提出了矿田和区域找矿方向.