得尔布干成矿区(北片)矿产资源远景评估

AN ASSESSMENT OF PROSPECTS FOR MINER AL RESOURCES IN DERBUGAN METALLOGENIC PROVINCE(NORTHERN PART )

得尔布干成矿区的黑山头以北地区(简称为“北片”)由6个成矿带组成,即上黑龙江成矿亚区(Ⅰ)的恩和哈达-二根河金成矿带(Ⅰ-1)、龙根河-二十一站铜金成矿带(Ⅰ-2)、奥拉奇-瓦拉干金成矿带(Ⅰ-3)和额尔古纳成矿亚区(Ⅱ)的乌玛-八道卡金(铜)成矿带(Ⅱ-1)、吉拉林-富克山铜金成矿带(Ⅱ-2)、下护林-西吉诺铅锌银金(铜)成矿带(Ⅱ-3).为了评估该区金属矿产资源潜力,为今后勘查工程提供科学依据和新的找矿思路,论述了各成矿带成矿地质条件、控矿因素、成矿类型.

There is a great potential of searchi ng for minerals in the northern part o f Heishantou within Derbugan metallogenic area(hereafter referred to as Northern Part).The Northern Part is composed of two metallogenic sub - provinces which are:1)Upper Heilongjiang(depression)Au-Cu metallogenic sub - province(I)and 2)Ergun(uplift)Pb,Zn,Ag,Au and Cu metallogenic sub - province(Ⅱ).In Enhehada-Ergenhe Au metallogeni c belt(Ⅰ-1),the'New Type'of Au ore is dominant and also the main di-rection of prognosis.The potential areas include the upper reach of Maoh e,Shabaosi dome structure,Ergenhe hidden rock body and so on.The terrigenous f ragmental rock of Ershiyizhan forma tion is the main host rock of the deposit of such type.The heat source for mineraliza tion comes from the J 3 -K 1 hypabyssal and ultra - hypabyssal acid-intermediate in-trusive.In Longgouhe - Ershiyizhan Cu - Au metallogenic belt(Ⅰ-2),the porphyry copper deposit,which is closely related to the acid-intermediate porphyry bod y,is the primary metallogenic type,followed by the'New Typeof Au deposit.The porphyry body groups in Longgouhe an d Ershiyizhan to Qiulibachi are the t argets for porphyry copper deposit prospect-ing.The excontact of the porphyry body is the favourable area for the'New Type'of Au deposit.In Aolaqi - Walagan Au metallogenic belt(Ⅰ-3),the studying is focused on the volca nic rock type of Au deposit.It is suggested that a further exploration be made in the deep of Aolaqi (reduced enviroment ).In Wuma-Badaoka Au (Cu)metallogenic belt(Ⅱ-1),the'intrusive complex type'of Au deposit is the principal metallogenic type.The prospective areas include Xikouzi,Langbeihe,A liya etc.The eastern part of Badaoka occurs metallization of the'New Typeof Au deposit and skarn type of Cu deposit.It is suggested that the focal point of ore-search should be put on the eastern part of Luoguhe.In Jibaogou - Fukeshan Cu - Au metallogenic belt(Ⅱ-2),according to Russian data,Qiqian r egion belongs to the favourable metallogenic zone for sk arn type of Cu(Au )deposit.We propose a reconnaissance survey for it.Fukeshan region is favorable for intrusive co mplex type of Au deposit,instead of t he quartz vein type.A further reconn aissance survey should be made in this area.In Xiahulin-Xijinuo Pb,Zn,Ag,Au an d Cu metallogenic belt(Ⅱ-3),the dominant ore should be volcanic rock type of Pb,Zn and Ag deposit and epith ermal adularia-sericite type of Au(Ag )deposit.We suggest a reconnaisance suvey for Pb,Zn and Ag in the prospective re gions of Jinling and Anan Forestry Ce nter and for adularia-sericite type of Au deposit in Merdaoga volcanic basin.