SHRIMP U-Pb Zircon Geochronology of the Xiaotongguanshan and Shatanjiao Intrusions and Its Petrological Implications in
This paper determines the crystallization ages of the Xiaotongguanshan quartz monzodiorite and Shatanjiao quartz monzonite porphyry from the Tongling area using the SHRIMP zircon U-Pb method. The crystallization age of the former is 142.8±1.8 Ma; that of the latter is 151.8±2.6 Ma. These data indicate that they were formed during the Late Jurassic (142.8 to 151.8 Ma). Zoned magma chamber was formed because of double diffusive convection. Therefore, the intrusive sequence of magma is generally from quartz monzonite through quartz monzodiorite to pyroxene monzodiorite,i.e. an inverted sequence.
作 者： DI Yongjun WU Ganguo ZHANG Da SONG Biao ZANG Wenshuan ZHANG Zhongyi LI Jinwen 作者单位： DI Yongjun,WU Ganguo,ZHANG Da,ZANG Wenshuan,ZHANG Zhongyi(State KeyLaboratory of Geological Processes and Mineral Resources, China University of Geosciences,Beijing 100083;Key Laboratory of Lithosphere Tectonics and Lithoprobing Techology, Ministry of Education, China University of Geosciences, Beijing 100083)SONG Biao(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037)
LI Jinwen(Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037)
刊 名： 地质学报（英文版） SCI 英文刊名： ACTA GEOLOGICA SINICA 年，卷(期)： 2005 79(6) 分类号： P5 关键词： zircon SHRIMP zircon U-Pb age granitoids Late Jurassic Tongling area Anhui