柿竹园超大型钨矿床的成矿作用与成矿条件

Metallization and Metallogenetic Conditions of Shizhuyuan Ultra large Tungsten Deposit

柿竹园超大型钨多金属矿床，是幔拗区地壳加厚深熔和元古宇基底剪切熔融产生的岩浆，在燕山早期侵入活动中形成的。其成矿作用，包括：地壳熔融岩浆分异、熔—流体不混熔相分离成矿和地层物质淋滤—蒸馏—对流等联合成矿作用。成矿条件，具有：①特富的Ｆ、Ｃｌ、Ｂ元素组合和成矿元素的岩浆—热液熔—流系统；②充足的矿源及挥发份源的多源补给；③侏罗纪蓄水盆地提供渗滤、对流的水源和部分动力；④位于构造有利的地块边绿，多组断裂岩浆成矿带的交切热柱体上；⑤在极富的Ｆ、Ｗ、Ｓｎ、Ｍｏ、Ｂｉ、Ｐｂ、Ｚｎ地球化学区中；⑥以及高挥发组分在极优的Ａｌ、Ｓｉ介质中对成矿物质的搬运；⑦在上部碳酸盐介质中交代、充填定位等优越的成矿条件。

Shizhuyuan ultra large tungsten deposit forms in the early Yanshan movement by the activity of magma which is produced from the anatexis of the thicken crust in the mantle depression and from the shear melting of Proterozoic basement. The metallization includes differentiation of crust molten magma,separation of the immiscible phases of melt fluid system and the compositing process of metallization of leaching distilla-tion convection of strata materials.With regard to the metallogenetic conditions there are as following 1)ele-ment assemblage very rich in F,Cl and B and magma hydrothermal solution,that is,the melt fluid system containing metallogenetic elements;2)full supply of metallogenetic materials and volatile components with mul-ti sources;3) Jurassic water storing basin providing water source for infiltration and convection and giving partly the motive power for metallization; 4)the border of two big massives and the intersections of fault groups at which occur the heat columns in the zone of magmatic metallization, all these places being favourable tectonic setting for deposit forming; 5)geochemical field extreamely rich in F,W, Sn, Mo, Bi, Pb and Zn; 6) high volatile components carrying and transporting metallogenetic materials in very suitable condition of Al and Si media;7)and the metasomatism and filling and emplacement of metallogenetic materials in upper carbonate rocks.