Geochemistry and Pb, Sr, Nd Isotopic Features of Ore-Bearing Porphyries in Bangong Lake Porphyry Copper Belt, Western Tibet
摘要
Detailed geochemical and Pb, Sr, Nd isotopic researches on the Duobuza copper deposit and the Garqiong copper deposit were conducted in the Bangong Lake copper belt. The result shows that, compared with the porphyries of the Gangdise copper belt, the ore-bearing porphyries of the Bangong Lake copper belt are weaker in the enrichment of large ion lithophile elements (LILE) and are also weaker in the depletion of high-field strength elements and high rare elements, thus having weak positive Eu anomaly. The Bangong Lake porphyry copper belt was formed in a post-collisional crustal up-lift stage, whereas the Gangdise porphyry copper belt in a stage of post-collisional crustal extensional collapse when the crust rose to the maximum height.