智利中北部海岸山脉中生代层控型铜(银)矿床

The Mesozoic stratabound type copper (silver) deposits in the coastal range of middle and northern Chile

文章试对智利一个重要的矿床类型——层控型铜（银）矿床做一综合概括和介绍。层控型铜（银）矿床，是智利继斑岩型、IOEG型（铁氧化物铜金型）之后的第三大矿床类型。主要分布于智利中北部海岸山脉，介于南纬21°～34°。矿床赋存于晚侏罗纪至早白垩纪火山和火山沉积岩系中。具体又可分为两条成矿带：即安托法加斯塔海岸山脉侏罗纪成矿带以及中部白垩纪成矿带。此类矿床的成因虽众说纷纭，但火山喷流沉积加后期次火山侵入体热液叠加改造成因观点理论依据最为充分。矿床的形成、就位是安第斯演化初期，即侏罗纪至早白垩纪的板块俯冲事件产物。

In this article the authors made a summary about an important deposit type in Chile： the stratabound copper （silver） deposit. This type of deposit, the thirdly important deposit type after the porphyry type and IOCG type in Chile, , and is hosted in the volcanic and volcano sedimentary sequences of late Jurassic to early Cretaceous along the costal range of central and northern Chile, between 21,9 S and 34.9 S. This belt can be divided into two sub belts： the Jurassic belt, which is located between 21.9 30-26？ S,hosted in the Jurassic volcanic sequences along the costal range of Antofagasta area; tand the Cretaceous belt,which is located between 30.9 -34.9 S,hosted in the volcanic and volcano sedimentary sequences of early Cretaceous. Although the genesis of this type of deposit is a long controversial one up to now, the most favorable one is SEDEX and reworked by later hydrothermal fluid derived from the volcano - intrusive. The ore deposit formed and was emplaced in the early period of the Andes mountain evolution, that means it resulted from the plate subduetion in the Jurassic to early cretaceous.