Three Stages of Zircon Growth in Magmatic Rocks from the Pingtan Complex,Eastern China

作     者：WANG Xiang W. L. GRIFFIN S. Y. O＇REILLY LI Wuxian 

作者机构：State Key Laboratory for Mineral Deposit Research Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 China GEMOC ARC National Key Center Department of Earth and Planetary Sciences Macquarie University NSW 2109 Australia CSIRO Exploration and Mining North Ryde NSW 2113 Australia 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2007年第81卷第1期

页      面：68-80页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This work is supported by the National Natural Science Foundation of China (No. 40572038) 

主　　题：zircon three stages of crystal growth typology trace element magmatic rock 

摘      要：Morphological and chemical studies on zircon grains from gabbro and granite of the Pingtan magmatic complex, Fujian Province, eastern China, show that there are three stages of zircon growth. The early stage of zircon growth is characterized by colorlessness, high transparence and birefringence, low and dispersive Ipr and Ipy, weak and homogeneous BSE brightness, lower Hf content and depletion of U, Th and Y; the middle stage is characterized by abruptly increasing lpy, progressively strong and sectoral-zoning BSE brightness, higher Hf content and enrichment of U, Th and Y with Th/U 〉 1; the late stage of growth is characterized by brownish color, poor transparence, low birefringence, highest Ipr and Ipy, middle and oscillatorily-zoning BSE brightness, highest contents of Hf, U and Y with Th/U 〈 1. The stages are considered to be formed in a deep magma chamber, ascent passage and emplacement site, respectively. Due to the more or less long residual time of the magma chamber, the difference in age between the early and late stages of zircon might be great enough to be distinguished, which can be attributed to tectonic constraint for the magnlatism.