云南省腾冲市小龙河锡稀土多金属矿田新知及其稀土矿的发现

通过对云南省腾冲市小龙河地区古永复式岩体原生构造、蚀变和矿化的类比、对比,结合构造地球化学、年代学研究和初步预查,新发现与之有关的热液弥散状蚀变、侵入角砾岩和大型稀土金属矿体,并伴生稀有金属铷(Rb)、铌(Nb)和稀散金属镓(Ga),存在晚期同岩浆断裂。花岗蚀变岩独居石、锆石和未蚀变黑云钾长花岗岩锡石、锆石U-Pb年龄分别为(75.61±0.47)Ma、(75.68±0.72)Ma、(76.3±3.2)Ma和(77.29±0.54)Ma,年龄相近,反映它们可能是岩浆晚期同构造活动的产物。

New cognition and discovery of rare earth deposits in the Xiaolonghe tin-REE polymetallic orefield of Tengchong in Yunnan Province

By the analogy and contrast of the primary structure, alteration and mineralization in Guyong rock body of Xiaolonghe area in Tengchong city, combining with tectonic geochemistry,geochronology and preliminary investigation, pervasive hydrothermal alteration, intrusive breccia and large REE ore bodies were discovered. And the rare metals (Rb and Nb) and scare metal (Ga) were accompanied. Also the synmagmatic faults were found in the later period. The U-Pb ages for the monazite and zircon of the altered granitic rocks are (75.61±0.47) Ma and (75.68 ± 0.72) Ma, and the U-Pb ages for the cassiterite and zircon of the biotite K-feldspar granites are (76.3 ± 3.2) Ma and (77.29 ± 0.54) Ma. These ages are very close, which reflects that they may be the products of tectonic activities at later period of the magmatic action.