藏南色如朗金红石矿床地质特征及控矿条件

Geological characteristics and ore-controlling conditions of the Serulang rutile deposit in southern Tibet

藏南色如朗金红石矿床位于米拉山口断裂带东段北缘,矿床的赋矿岩石主要为绿片岩。由北向南圈定了3个矿体,矿体沿北东方向延伸,呈层状、似层状产出。矿石矿物以金红石为主,其他金属矿物有磁铁矿、赤铁矿、黄铁矿、黄铜矿、磁黄铁矿等。金红石主要为红褐色,少数为暗红褐色,呈自形-半自形柱状和他形粒状,粒径多为0.01~0.2mm,大者可达1~2mm。该矿床的形成主要受地层和变质作用控制,后期构造对矿床形态有一定的破坏作用。通过与中国典型金红石矿床地质特征对比,初步认为色如朗金红石矿床的成因类型为中低压变质型。

The Serulang rutile deposit in southern Tibet is located at the north edge of the eastern Mila Pass fault zone. The green schist is the major ore-hosting rock. Three orebodies were discovered from north to south,which are broadly distributed in simple layers and extend in the northeast direction. The major ore mineral is rutile,which is associated with such metal minerals as magnetite,hematite,pyrite,chalcopyrite and pyrite. The rutile,which exhibits euhedral-subhedral columnar and anhedral granular forms,is mainly red brown and subordinately dark brown in color. Its particle size is 0.01~0.2 mm,with the largest up to 1~2 mm. The formation of the deposit was mainly controlled by both strata and metamorphism. The later structures had a certain destructive effect on the shape of the ore deposit. Geological characteristics comparison of the Serulang deposit with other typical rutile ore deposits in China indicates that the genetic type of the Serulang ore deposit is the medium-low pressure metamorphic type.