中国的天然硅铁矿  

Native Fersilicite of China

作　　者：胡雄健 

机构地区：[1]浙江省第七地质大队

出　　处：《岩石矿物学杂志》1995年第1期71-78,共8页Acta Petrologica et Mineralogica

摘　　要：硅铁矿属于罕见的Ｓｉ和Ｆｅ的互化物类矿物，目前在自然界已发现并命名的此类矿物相的矿物有：古北矿（Ｆｅ＿３Ｓｉ）、喜峰矿（Ｆｅ＿５Ｓｉ＿３）、等轴硅铁矿（ＦｅＳｉ）、二磋铁矿（ＦｅＳｉ＿２）及苏硅铁矿（ａＦｅ＿３Ｓｉ）等５种。本文着重介绍我国自１９８０年以来在藏、甘、冀、苏、皖、新、辽、浙诸省区所发现的二硅铁矿及其连生矿物自然硅。Fersilicite is rare Si and Fe metallic mineral.Up till now,five sorts of mineral facies have been discovered,namely gubelite(Fe_3Si),xifengite(Fe_5Si_3),fersilicite(FeSi),ferdisilicite(FeSi_2 ) and suessite(a-Fe_3Si),of which the first two minerals were found in the alluvial bed of Yanshan area. belonging to cosmic dust minerals. In 1980 ,Hong Wenxing first reported the discovery of ferdisilicite in Tibet and Gansu;afterwards, this mineral was successively found in such provinces (regions)as Jiarngsu,Anhui,Xinjiang,Liaoning, Hebei and Zhejiang,and its host rocks are magmatic rocks,sedimen- tary rocks and metamorphic rocks,with mafic and uItramafic rocks being dominant.The host rocks were formed from Archean to Cenozoic,and the southern Zhejiang Proterozoic metamorphic area seems most widely distribu- ted.Ferdisilicite of China contains Fe 41.1%─49.9% andSi 49.1%一55.9%,being deficient in Fe and rich in Si as compared with the theoretical values. In addition,ferdisilicite contains such minor elements as Mn,Al,Ce,Eu,whose contents are different in different areas. Besides fersilicite,the associa- ted minerals of ferdisilicite include sporadic native silicon(Si ),and this haS been confirmed by mineralogical and electron microprobe analyses and X-ray diffraction data. The areas producing primary native silicon so far known include Liaoning, Zhejiang and Fujian. Genetically,fersilicites are derived either from mantle magma or meteo- rite falling. The fersilicites in the southern Zhejiang metamorphic area might have been related to the Arcbean meteorite falling event.

关 键 词：硅铁矿 二硅铁矿 自然硅 矿物 

分 类 号：P578.12[天文地球—矿物学]