摘要
竹溪天宝一带位于南秦岭造山带中部北大巴山东段南侧,志留纪裂谷火山活动为区域内的稀有稀土矿提供了非常有利的条件。1∶5万水系沉积物测量结果显示,铌、镧异常均与志留纪粗面岩类密切相关。矿体赋存于粗面质火山岩旋回中下部的熔结角砾岩、熔结凝灰岩层位,含矿岩性为粗面质熔结凝灰岩、粗面质熔岩、含钾长石斑晶粗面质熔岩、粗面质角砾熔岩等,主要含铌矿物为铌铁矿和褐钇铌矿。矿床类型为与幔源碱性岩浆岩有关的火山岩型岩浆矿床。铌矿(Nb_2O_5)资源量(3341)为21.05万t,可达大型。该粗面岩带向北西方向延伸至陕西境内,规模巨大,极具找矿前景。
Tianbao area of Zhuxi county is located in the southeast part of North Dabashan, middle Southern Qinling Orogen, Silurian Period rift volcanic activity is rare metal and REE mine in the region provides a very favorable conditions. According to the result of the 1 ： 50 000 stream sediment survey, niobium, lanthanum abnormalities are associated with Silurian Period Trachyte class are closely related. Ore body in the trachytic volcanic cycle in the lower part of breccia lava, ignimbrite horizons, which are trachytic ignimbrite, traehytic lava, trachytic lava containing crystals of feldspar, trachytic breccia lava and so on. The main Niobium minerals are niobite and fergusonite. Deposit type is volcanic type magmatic deposit about mantle alkaline magma. Niobium（ Nb205 ） resource（3341 ） is 210 500 t,and can reach the large-scale deposit. The traehyte band extends with Northwest to Shaanxi Province has great prospecting potential.
出处
《资源环境与工程》
2015年第6期779-784,共6页
Resources Environment & Engineering
基金
中国地质调查局项目(编号:1212011220508
12120113012800)资助
关键词
南秦岭
竹溪
粗面岩
铌矿
地质特征
Southern Qinling
Zhuxi area
trachyte
niobium ore
geological characteristics
