四川小金—理县一带铌钽矿成矿预测研究

METALLOGENIC PROGNOSIS OF NB AND TA IN THE XIAOJIN-LIXIAN AREAS, SICHUAN

四川小金-理县一带发育有燕山期和印支期两期花岗岩,存在稀有金属化探异常,已发现多处稀有金属矿(化)点,具有较好的铌钽成矿地质条件.该区内Nb、Ta具有印支期和燕山期两期成矿模式,前者富Ta,后者富Nb.岩体化学成分上以富碱为特征,Nb、Ta与Ti、Na、K相关性较好.通过对区域地质、区域地球物理、地球化学特征和已知矿床矿点的对比,研究了含矿岩体的岩石化学、岩石地球化学特征.在此基础上划分出4个铌钽找矿远景区,预测了资源远景储量(334)为Ta2O5 200～500t,Nb2O5 300～600t.

Yanshanian and Indo-Sinian granitoids are developed in the Xiaojin -Lixian areas of Sichuan province. Geochemical anomalies of rare metals exist in the granitoids and several rare metals mineralizing deposits or spots have been found, showing good Nb and Ta mineralizing conditions in the area. Nb and Ta mineralization are developed in Yanshanian and Indo-Sinian epochs, which the former is rich in Ta and the latter rich in Nb. The granitoid is characterized by high alkali and well relationship of Nb, Ta to Ti, Na and K. According to regional geological survey, regional geophysical and geochemical anomaly, as well as the known ore deposits, lithochemistry and geochemistry of Nb and Ta ore - bearing granitoids are studied. Four Nb and Ta ore prospecting areas are divided. Future reserves prognosis of Ta2O5 200-500t and Nb2O5 300-600t are suggested.