本文選題：偃尾山銅銀礦床　切入點(diǎn)：圍巖蝕變　出處：《地質(zhì)與勘探》2017年03期

【摘要】：偃尾山銅銀礦床是大興安嶺北段呼中-塔源成礦帶內(nèi)新發(fā)現(xiàn)的中小型礦床。礦床圍巖蝕變呈面狀分布,主要蝕變類型為硅化、碳酸鹽化、黃鐵礦化、伊利石化、高嶺石化和絹云母化。熱液成礦期可分為三個(gè)階段:成礦早期石英-黃鐵礦階段(含少量黃銅礦)、主成礦期石英-斑銅礦-黃銅礦-輝銅礦(含銅硫化物)階段和成礦晚期石英-碳酸鹽-螢石階段(含少量方鉛礦和閃鋅礦)。該礦床流體包裹體主要為富液相包裹體,也有少量純氣相包裹體,未見含子礦物包裹體。主成礦階段流體包裹體均一溫度為155℃~342℃,峰值集中在160℃~230℃,冰點(diǎn)溫度在㧟3.3℃~㧟0.3℃,鹽度為0.53%NaC_(leqv)~5.41%Na Cleqv;流體成分以K~+、Na~+、SO_4~(2-)為主,含少量Ca~(2+)和Cl~-,氣相成分以H_2O為主,含少量的CO_2;流體δ~(18)O在-11.8‰~-13.72‰之間,δD變化范圍在-105‰~-137‰之間。總體上,成礦流體為低溫低鹽度流體,流體來源主要是大氣降水,成礦流體和礦床蝕變-礦化特征顯示本礦床可能為高硫型淺成低溫?zé)嵋旱V床。流體壓力的突然降低可能是成礦物質(zhì)沉淀的主要機(jī)制。偃尾山礦床可能代表了區(qū)域上同時(shí)代一種新的礦床類型,后續(xù)深入研究將有助于認(rèn)識該區(qū)域成礦規(guī)律和找礦方向。
[Abstract]:The Yanwei Mountain copper silver deposit is a newly discovered medium and small size deposit in the Huzhong-Tawan metallogenic belt in the northern part of the Daxinganling Mountains.The main alteration types are silicification, carbonization, pyrite, Yili petrochemical, kaolinite and sericite.The hydrothermal metallogenic period can be divided into three stages: the quartz-pyrite stage (containing a small amount of chalcopyrite) in the early metallogenic stage, the quartz-porphyrite -chalcopyrite (copper-bearing sulfide) stage in the main metallogenic stage and the quartz-carbonate stage in the late metallogenic stage.Salt-fluorite stage (containing a small amount of galena and sphalerite).The fluid inclusions in the deposit are mainly liquid rich inclusions and there are a few pure gas inclusions.涓繪垚鐭塊樁孌墊祦浣撳寘瑁逛綋鍧囦竴娓╁害涓，

本文編號：1711953