中国东北部地区埃达克岩及其成矿意义

Adakites in northeastern China and their mineralized implications.

中国东北部地区埃达克岩分布较广,以吉林居多,内蒙古东部和黑龙江较少。本区埃达克岩分别形成于古亚洲洋、蒙古-鄂霍茨克洋和环太平洋三个构造带,时代为早古生代中期-中生代。区内以埃达克岩为成矿主岩的热液矿床矿种主要为Au和Cu,其次为Mo;成因类型主要为斑岩型、岩浆热液型和浅成低温热液型;成矿时代主要为早古生代中期、晚古生代晚期及中生代中晚期。依据本地区埃达克岩和与其相关的热液矿床特征及产出的构造部位,将本区以埃达克岩为含矿岩的热液矿床划分为大兴安岭北部、蒙吉黑和吉黑东部3个成矿区。

Adakites are widely distributed in Northeast China, particularly in Jilin Province, and rarely in the east of Inner Mongolia and Helongjiang Province. The Adakites in Northeast China were formed in three tectonic settings, namely the Paleo-Asian Ocean, the Mongolia-Okhotsk Ocean and the Circum-Pacific Ocean. The time limit of the adakites is from the middle stage of Early Paleozoic to Mesozoic. The adakite-hosted hydrothermal deposits in the area are mainly An and Cu, secondly Mo. The genetic types are porphyry and magmatic hytrothermal and epithermal fluids. The mineralizated epochs are the middle stage of Early Paleozoic, the late stage of Late Paleozoic and the middle and late stages of Mesozoic. Based on the characteristics of the adakites and the related hytrothermal deposits, as well as the tectonic settings, the minerogenetic provinces fall into three regions, namely the north of Da Hinggan Moutain, Meng-Ji-Hei and eastern Ji-Hei.