祁连山西段党河南山北坡3个不同特征的金矿床研究

黑刺沟金矿床以富As和Sb的微细浸染蚀变岩型金矿化和部分石英脉型锑－金矿化为特征,典型矿物组合为黄铁矿-毒砂(辉锑矿)-石英;贾公台金矿床以少硫化物石英脉型金矿化和蚀变岩型金矿化为特征,As和Sb的质量分数不高,典型矿物组合为黄铁矿-自然金(方铅矿)-石英-钾长石;鸡叫沟金矿床以蚀变岩型金矿化为主,次之为石英脉型金矿化,典型矿物组合为黄铁矿-黄铜矿-石英.3个金矿床的成因均与岩浆岩有密切联系,但各矿区的岩浆岩在岩石学、岩石化学、微量元素及稀土元素特征具有差异,表明其成因不尽相同.这可能是造成3个金矿床地质特征差异的主要原因.

STUDY ON 3 GOLD DEPOSITS VARIED IN CHARACTERISTICS AT THE NORTH SLOPE OF THE DANGHE NANSHAN MOUNTAIN IN THE WEST QILIAN MOUNTAINS

Heicigou gold deposit is characterized by micro-disseminated altered cataclastic rock type gold mineralization and partial quartz vein type gold mineralization riched in As and Sb and typical pyrite arsenopyrite(stibnite) quartz association;Jiagongtai gold deposit by quartz vein type Au mineralization and altered cataclastic rock type gold mineralization with less sulfides and low As and Sb and typical pyrite native gold(galena) quartz K-feldspar association;Jijiaogou gold deposit by gold mineralization dominated by the altered cataclastic rock type then the quartz vein type and typical pyrite chalcopyrite quartz association.The three gold deposits are all genetically closely related to magmatic rocks.However,the magmatic rocks of individual deposit are varied in petrology,petrochemistry,micro-elements and REE thus the deposits are different more or less in genesis.The petrological variation may result in difference of geological characteristics of individual gold deposits.Based on this the study is further deepened on gold ore searching in the area.