DONG Ya-lin1, ZHANG Ju-quan2,3, ZHAO Wen-xia4*, LI Sheng-rong3, WU Hai1
(1. School of Earth Science and Geological Engineering, Sun Yat_Sen University, Guangzhou 510275, China;
2. School of Gemology and Materials Texhnology, Shijiazhuang University of Economics, Shijiazhuang 050031, China;
3. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
4. Instrumentation Analysis & Research Center, Sun Yat_Sen University, Guangzhou 510275, China)
Abstract: In order to discuss the growth condition for zircon and its relationship with the formation and evolution of magmatic rocks from the region, morphology of zircon was studied. Results show that in different lithological rocks, ratio of zircon’s length and width is mostly between 1.5∶1 and 3∶1, meaning that the magma is alkaline. Zircons can be divided into R2, S2-5, P1-5, S7-10, S12-15 and so on according to Pupin’s classification of zircon crystals. It shows that the zircons are crystallized in the alkaline magma and the temperature is lower. The liquid’s temperature of the rocks is between 800 and 750 ℃. The massive crystallization temperature of the zircon is from 700 to 650 ℃. The temperature span of crystallization is large for continuous time. The magma is water-rich and this result is conducive to mineralization of porphyry Cu-Mo-Au deposit .The chemical composition analysis of magmatic rocks and the evolution trend of the zircons in different rocks in this area show that,in addition to crust materials ,the mantle compositions are also entered in the magma .the magma belong to calcium and alkali rock series (toward alkaline).
Keywords: zircon; morphology; Porphyry deposit; Cu-Mo-Au mine
Email: zhaowx@mail.sysu.edu.cn
ACTA MINERALOGICA SINICA Vol. 36, No. 1, 2016, Page 54-60
