巴布亚新几内亚陆缘火山岛弧成矿带铜金成矿规律

Cu-Au Metallogenic Regularity in the Mineralization Belt Along the Continent Marginal Volcanic Arc Islands of Papua New Guinea

巴布亚新几内亚陆缘火山岛弧成矿带形成于印澳板块与太平洋板块的边界带,其演化涉及俯冲与火山岛弧(岩浆弧)的形成、弧陆碰撞与造山、俯冲陆壳折返、岩浆侵入、成矿作用等多种地质作用。该成矿带的铜金成矿时代比较年轻,成矿集中于23Ma～12Ma、7Ma～1Ma及0. 5Ma～0Ma三个成矿高峰期。空间上可以分为6个成矿亚带,分别为奥克泰迪-波尔盖拉成矿亚带、弗里达河-拉穆成矿亚带、海登山谷-凯利门戈成矿亚带、托鲁库玛-比尼山成矿亚带、瓦普鲁-伍德拉克成矿亚带、利希尔-潘古纳成矿亚带。成矿带主要铜金矿床类型为斑岩型、浅成低温热液型和矽卡岩-斑岩型。成矿受控于俯冲作用、弧陆碰撞造山作用、侵入杂岩体、褶皱和断裂、破火山口等因素。

The mineralization belt along the continent marginal volcanic arc islands of Papua New Guinea is located in the convergence boundary between Indian-Australian and Pacific plates.The regional geodynamic evolution has experienced the formation of volcanic islands arc(magmatic arc),arc-continent collision and orogenesis,exhumation of subductive continental crust,magmatic intrusion,metallogenesis and other geological events.The metallogenic process of Cu-Au deposits in this belt culminated in three time periods,i.e.,23Ma^12Ma,7Ma^1Ma and 0.5Ma^0Ma.The metallogenic belts can be spatially divided into six sub-belts,which are OK Teddy-Porgera,Freda River-Ramu,Hayden Valley-Kerimenge,Tolukuma-Mt.Bini,Wapulu-Woodlark Island and Lihir-Panguna.The major Cu-Au deposits in this region comprise porphyritic,epithermal and skarn-porphyritic types,of which the metallogenic processes were controlled by subduction,arc-continental collision orogenesis,intrusive complex,folds,faults,calderas and other factors.