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白干湖—戛勒赛一带钨锡成矿与岩枝、岩珠状更长花岗岩等小岩体密切相关。戛勒赛矿床含矿更长花岗岩LA-ICP-MS锆石U-Pb年龄为(429.5±3.3)Ma,εHf(t)为-11.05～7.40,平均为-1.26,T2DM为944～2111Ma,平均为1492Ma;地球化学特征上,富集Rb、Cs、Nb、Sn,亏损Ba、Zr、Hf、Th、Sr、Ti、V、La等。该带与钨锡成矿关系密切的花岗岩均为早志留世局部拉张环境下地幔底侵重熔古老长英质地壳所形成,更长花岗岩小岩体为富含流体的残余岩浆所形成。综合研究认为,钨锡成矿作用主要有2个阶段:第一阶段发生在加里东期地幔底侵重熔古老长英质地壳形成的含W花岗质岩浆侵入过程中,形成了深部二长花岗岩岩基、浅部更长花岗岩小岩体,在小岩体顶边部及与地层接触带中形成云英岩型、矽卡岩型钨矿体;第二阶段,岩浆期后热液淋滤围岩W、Sn等金属,形成含钨锡成矿流体,沿裂隙充填形成了石英脉型钨锡矿体。
The molybdenum-tin mineralization in the Baganghu-Zarlersai zone is closely related to small rock masses such as the rockburst and the longer-beaded granite. LA-ICP-MS zircon U-Pb ages of (429.5 ± 3.3) Ma and εHf (t) of -11.05 ~ 7.40 with an average of -1.26 and T2DM of 944 ~ 2111Ma were obtained from the longer ore- For the 1492Ma; geochemical characteristics, enrichment of Rb, Cs, Nb, Sn, loss of Ba, Zr, Hf, Th, Sr, Ti, V, La and so on. The granite with the tungsten-tin mineralization is formed by the Early Permian intrusion in the Early Zhiwu area under the mantle floor with the intrusive ancient magma olivine crust. The longer granite small rocks are formed by fluid-rich remnant magma. The comprehensive study suggests that there are mainly two stages of the tungsten-tin mineralization: the first stage occurred during the intrusive process of W granitic magma formed by the intrusive infringing paleo-British crust in the Caledonian mantle, Granite basement, the smaller part of the longer granite small rock body, in the small rock mass and the contact zone with the formation of the kerogen type, skarn type tungsten ore body; the second stage, after the magmatic hydrothermal shower Filtering the rocks such as W, Sn and other metals to form tungsten-bearing tin-bearing fluids and forming quartz vein-type tungsten-tin ore bodies along the fissures.