中国夕卡岩矿床中的角闪石

Amphiboles in Skarn Deposits of China

文章综合分析研究了中国 2 1个夕卡岩矿床中的 1 30个角闪石的成分分析数据。根据夕卡岩类型及其伴生金属矿化的不同 ,把角闪石分为 4大类 :钙夕卡岩中的角闪石多属钙角闪石 ,包括绿钙闪石、铁角闪石、镁绿钙闪石、铁浅闪石、阳起石、铁阳起石、铁镁钙闪石和铁韭闪石等 ;镁夕卡岩中的角闪石以透闪石为主 ,局部有浅闪石或韭闪石 ;锰质夕卡岩中的角闪石有锰质阳起石、锰质透闪石、锰直闪石和锰镁闪石 ;碱质夕卡岩中的角闪石属钠_钙角闪石或钠角闪石类 ,包括钠透闪石、镁亚铁钠闪石、亚铁钠闪石、镁铝钠闪石和镁钠闪石。碳酸盐围岩和有关侵入岩的成分对角闪石的类型。

Based on 130 analyses of amphiboles from 21 skarn deposits in China, the authors have studied their types, optical properties, composition characteristics, and parageneses. Different skarn types have different definite amphibole variaties and associated mineralizations: amphiboles in calcic skarns mostly belong to calcic amphiboles such as hastingsite, chlorian hastingsite, potassian hastingsite, potassic hastingsite, magnesiohastingsite, ferrohornblende, chlorian ferrohornblende, fluorian ferrotschermakite, ferro_edenite, actinolite, and potassian ferropargasite. The associated mineralizations may have such components as Fe, Cu, Au, Sn, Mo and B. Amphiboles in magnesian skarns are mainly tremolite and locally edenite and pargasite associated with Fe, Cu, Au, Sn, Mo, B mineralizations. In manganoan skarns, amphiboles may have manganoan actinolite, manganoan tremolite, mangano_anthophyllite, and manganocummingtonite associated with Pb_Zn_Ag mineralization. Amphiboles in alkaline skarns are of sodic_calcic and sodic types and consist of richterite, fluororichterite (fluorian richterite), arfvedsonite, magnesio_arfvedsonite, potassic magnesio_arfvedsonite, fluorian magnesioriebeckite and fluorian_potassic eckermannite associated with U, Th, REE, Fe, Nb mineralizations. The compositions of carbonate wall rocks and related intrusions must have played important roles in determining types and compositions of amphiboles as well as their associated mineralizations.