地质科技情报2017，Vol.36Issue(3)：103-109,7.DOI:10.19509/j.cnki.dzkq.2017.0313
河北省石湖金矿含金石英脉中锆石U-Pb年龄及其地质意义
Zircon U-Pb Ages of Gold-Bearing Quartz Veins in the Shihu Gold Deposit of Hebei Province and Its Geological Significance
摘要
Abstract
The Shihu gold deposit,currently the only large gold deposit in the western Hebei,is located in the middle-southern section of Fuping mantle branch and its surrounding rocks are mainly Archean Fuping Group rocks.In order to deeply study the metallogenic age of this gold deposit,this paper focuses the zircons from gold-bearing quartz veins with analysis of cathodoluminescence image features and U-Pb ages by LA-ICP-MS.The results show that the zircons mainly display characteristics of magmatic zircon,with idiomorphic-hypidiomorphic texture and oscillatory zones,main Th/U ratio above 0.1.Two main groups of zircon U-Pb ages were obtained,the 2:7Pb/206Pb ages of (2 569±41)-(2 014±38) Ma and the 206Pb/238U ages of (136±4) Ma respectively.The first ages are mainly below the discordia,indicating the varying degree of losses of radiogenic lead.And an upper intercepted age of (2 492±82)Ma shows the crystallization age of magmatic zircon probably from the Fuping Group TTG gneiss.Combining the second age with the spatial position relation of ore bearing geological bodies,it shows that the main metallogenic events of Shihu gold deposit occured after (136±4)Ma.In addition,the hydrothermal zircons have not been found in gold-bearing quartz veins in the current and zircons are from the surrounding rock.关键词
石湖金矿/锆石/U-Pb年龄/含金石英脉/幔枝构造/麻棚岩体/阜平群Key words
Shihu gold deposit/zircon/U-Pb age/gold-bearing quartz vein/mantle branch structure/Mapeng granitic intrusion/Fuping Group分类
天文与地球科学引用本文复制引用
陈超,曹亚琦,张小青,王芳,赵夫旺,张福祥,牛树银,马宝军,高银仓,王建成,路亚飞..河北省石湖金矿含金石英脉中锆石U-Pb年龄及其地质意义[J].地质科技情报,2017,36(3):103-109,7.基金项目
国家自然科学基金项目(40872137) （40872137）
河北省自然基金项目(D2015403013) （D2015403013）
河北省教育厅项目(ZC2016060) （ZC2016060）
河北地质大学博士基金项目(BQ201320) （BQ201320）
