中国地质2012，Vol.39Issue(6)：1543-1561,19.
德兴矿集区花岗闪长斑岩锆石U-Pb年龄、Hf同位素特征及其意义
U-Pb dating and Hf isotopic characteristics of zircons from granodiorite in the Dexing ore concentration area
摘要
Abstract
The Dexing ore concentration area located at the juncture between Qiantang body and Jiangnan body is one of the large ore concentration areas along the Qinhang metallogenic belt of eastern China. It includes Tongchang, Fujiawu and Zhushahong porphyry Cu-Mo-Au deposits, Yinshan Ag-Cu-Pb-Zn polymetallic deposit, Jinshan gold deposit and other large and superlarge ore deposits. Based on systematic field geological survey and sample acquisition, this paper presents in situ zircon U-Pb and Hf-isotopic data of Tongchang, Fujiawu, Zhushahong and Yinshan deposits: 171 ± 1.2 Ma for Tongchang, 172 ±0.68 Ma Ma for Fujiawu, 173 ± 1.3Ma for Zhushahong, and 176 ± 1.5 Ma Ma for Yinshan. These data show that all the granodiorite-porphyry bodies were formed in the Early-Middle Jurassic period. Zircon in-situ analysis of four samples gives the average εHf (t) values of (4.34～5.54) with limited variation and Hf crustal model ages of 861Ma, 876 Ma, 904 Ma and 941 Ma. The Zr/Hf ratios are close to the Zr/Hf ratio of the upper mantle . Zircon Hf isotopic composition suggests that the parental magmas of the rock bodies were mainly derived from a young mande and partly mixed with old continental crust rock during the evolution. Mande material in the Dexing ore concentration area played an important role in the formation of the granodiorite porphyry. The most important rock-forming and ore-forming period of the four deposits should be in 170 ～ 175 Ma. The continual magmatic hydrothermal activation might have been the important factor responsible for the formation of the Dexing ore district.关键词
LA-ICP-MS zircon U-Pb dating/Hf isotope/Dexing/JiangxiKey words
LA-ICP-MS zircon U-Pb dating/Hf isotope/Dexing/Jiangxi分类
天文与地球科学引用本文复制引用
水新芳,赵元艺,郭硕,吴德新,朱小云,王增科..德兴矿集区花岗闪长斑岩锆石U-Pb年龄、Hf同位素特征及其意义[J].中国地质,2012,39(6):1543-1561,19.基金项目
国土资源部公益性行业科研专项"江西德兴斑岩铜矿科学基地研究"(200911007-01)、"德兴铜矿集区地球化学环境累积效应与预警方法研究"(201111020-05)以及中国地质调查局地质矿产调查项目"钦杭成矿带中新生代岩浆-热液多金属成矿与靶区优选"(1212011085408)共同资助. （200911007-01）
