CAJ | 학술논문

豫西卢氏八宝山铁铜多金属矿床是华北克拉通南缘中生代斑岩成矿体系中以铁矿化为主的矿床，其中南矿带和西矿带广泛发育黄铁矿。电子探针成分显示，黄铁矿的主要元素S和Fe的总和超过90%，但同一种黄铁矿表面不同位置微量元素Cu和As的含量存在突变。这种突变说明，来源于同一岩浆热液系统的富液相流体与上升的富气相流体的混合作用是引起黄铁矿沉淀的主要机制。黄铁矿中的As有两种赋存价态As3+和As1–，代表了八宝山斑岩矿床中形成黄铁矿的岩浆流体可能经历了先氧化后还原的环境(As3+指示氧化环境， As1–指示还原环境)，说明八宝山矿区具有斑岩铜矿的成矿潜力。
예서로씨팔보산철동다금속광상시화북극랍통남연중생대반암성광체계중이철광화위주적광상，기중남광대화서광대엄범발육황철광。전자탐침성분현시，황철광적주요원소S화Fe적총화초과90%，단동일충황철광표면불동위치미량원소Cu화As적함량존재돌변。저충돌변설명，래원우동일암장열액계통적부액상류체여상승적부기상류체적혼합작용시인기황철광침정적주요궤제。황철광중적As유량충부존개태As3+화As1–，대표료팔보산반암광상중형성황철광적암장류체가능경력료선양화후환원적배경(As3+지시양화배경， As1–지시환원배경)，설명팔보산광구구유반암동광적성광잠력。
The Babaoshan iron and copper polymetallic deposit, which is located in Lushi county Henan province, is unique for its iron-predominated ore mineralization among all the Mesozoic porphyry metallogenic systems in the southern margin of the North China Craton. Pyrite is ubiquitous in the southern and western parts of the deposit. Their EMPA analyses indicated the contents of S and Fe are more than 90% in total, the contents of Cu and As of the pyrites vary considerably even within the same grain. The abrupt change suggests mixing of ore-forming fluid and upward magmatic vapors from the same magmatic-hydrothermal system is the major force to induce pyrite deposition. That As exist in two valence states, As3+ and As1–, revealed that the Babaoshan pyrite-forming fluid was oxidative originally and changed to be reductive subsequently. The oxygen fugacity fluctuation is a positive factor to the formation of the Babaoshan porphyry copper deposit.