Citation: | SHI Chao, LI Rongshe, HE Shiping, JI Wenhua, GU Pingyang, CHEN Shoujian, ZHANG Haidi. 2017: A study of the ore-forming age of the Hutouya deposit and its geological significance:Geochemistry and U-Pb zircon ages of biotite monzonitic granite in Qimantag, East Kunlun Mountains. Geological Bulletin of China, 36(6): 977-986. |
The Hutouya Pb-Zn polymetallic ore deposit is located in Qimantag, East Kunlun Mountains.Intermediate-acid intru-sive rocks occur widely in this area, and are closely related to iron polymetallic mineralization.The 206Pb/238U weighted average age is 234.2±1.5 Ma, which was obtained by in-situ LA-ICP-MS zircon dating of biotite monzonitic granite that was closely related to mineralization and skarn.The results of geochemical analysis show that the biotite monzonitic granite is characterized by high Al2O3, K2O and low TiO2, Na2O.The I-type granites are characterized by rich LREE, Rb, Th and some of HFSE, but poor Nb, Sr and Zr, and clear separation of LREE from HREE.In diagram of(Y+Nb)-Rb, all samples fall into post-collision granite area, and in R1-R2 diagram, all samples fall into the superimpositon of post-collision granite area and collision granite area, indicating that the gran-ites probably formed in a collision-post-collision structural phase.The Ⅵ belt of the Hutouya Pb-Zn polymetallic ore deposit expe-riended strong skarnization.The authors hold that the deposit has characteristics of skarn deposit, as shown by its ore fabric, gangue minerals, wall rock alteration, and it was formed at 234.2±1.5 Ma (Middle-Late Triassic).
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