地质学报2011，Vol.85Issue(1)：88-96,9.
鄂东丰山矿田花岗闪长斑岩体锆石SHRIMPU-Pb定年及其意义
SHRIMP U-Pb Zircon Dating for Granodiorite Porphyry of the Fengshan Orefield in Eastern Hubei Province and ItsGeological Significance
摘要
Abstract
As an important part of the polymetallogenic belt on the Middle-Lower Reaches of the Yangtze River, the Fengshan orefield consists of large-medium-sized Cu-Au polymetallogenic deposits, distributed in Jilongshan,Fengshan, and Lijiawan. Orebodies occur within the contact zones of granodiorite porphyry with Triassic carbonate, and the mineralization was closely related to the Yanshanian granodiorite porphyry. Zircon SHRIMP U-Pb dating was carried out for the mineralized granodiorite porphyry and yielded age of 138 ± 2Ma(95 ％ confidence, MSWD= 5.1 ) for the Jilongshan granodiorite porphyry and 137 ±2Ma(95％ confidence,MSWD=l. 4)for the Fengshan granodiorite porphyry. The results are consistent with the molybdenite Re-Os isochron age( 140Ma± ) of typical Cu-Au-Mo-(W) deposits in the southeastern deposit--intensive region, indicating that the diagenesis and metallogeny events of the Fengshan orefield happened in the Early Cretaceous. This study also obtained the age of Neoproterozic zircon from the Jilongshan granodiorite porphyry, and this provides evidence for existence of the Neo-Archean-palaeoProterozoic crystalline basement in the northern margin of the Yangtze massif.关键词
锆石SHRIMP U-Pb定年/新太古代/花岗闪长斑岩/丰山矿田/鄂东Key words
Zircon SHRIMP U-Pb dating/ Neo-Archean/ granodiorite porphyry/ Fengshan orefield/ Eastern H ubei Province/ South China引用本文复制引用
陈富文,梅玉萍,李华芹..鄂东丰山矿田花岗闪长斑岩体锆石SHRIMPU-Pb定年及其意义[J].地质学报,2011,85(1):88-96,9.基金项目
本文为国家科技支撑计划"南岭地区有色-贵重金属成矿潜力及综合探测技术示范研究"(编号 2006BAB01B03)、国土资源大调查"我国重要矿产和区域成矿规律研究"(编号 1212010633903)、"中国成矿体系综合研究"(编号 1212010634002)和"我国西部重要成矿区带矿产资源潜力评估"(编号 1212010535804研究成果. （编号 2006BAB01B03）
