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太行山北段赤瓦屋铜钨矿化区花岗质岩石的锆石U-Pb年龄及其地质意义 被引量:6

Zircon U-Pb age of granitoid from the Chiwawu Cu-W occurence Northern Taihang Mountain and its implications
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摘要 太行山北段位于华北克拉通中部,以发育中生代中酸性岩浆岩及多个大中型斑岩-矽卡岩铜钼矿床和金矿床为主要特征,最近在南部赤瓦屋岩体内部发现新类型铜钨矿体.文章选择赤瓦屋岩体为对象,开展不同岩相详细的野外地质和锆石U-Pb测年工作,确定赤瓦屋岩体不同岩性的成岩时代,探讨其地质意义.研究表明,赤瓦屋岩体有边缘相石英闪长岩、边缘相花岗闪长岩和中心相斑状花岗闪长岩及晚期中酸性岩脉,其中铜钨矿化主要发育于中心相斑状花岗闪长岩.石英闪长岩、花岗闪长岩、斑状花岗闪长岩和花岗闪长斑岩脉的锆石U-Pb谐和年龄分别为(134±1)Ma、(133±1)Ma、(131±2)Ma和(128±1)Ma,表明赤瓦屋岩体不同岩相体形成于早白垩世(134-131Ma).结合区域年代学资料,提出太行山北段晚中生代至少存在两期岩浆-成矿事件. The Northern Taihang Mountain is located in the central part of North China Carton, characterized by Mesozoicintermediate-acid magmatic rocks and plenty of important porphyry-skarn Cu-Mo deposits and hydrothernal gold deposits. A newCu-W orebody within the Chiwawu granitoid was recently discovered in the southernmost part. The authors conducted field surveyand zircon U-Pb dating of different granitic petrofacies from the Chiwawu Cu-W ore district, and then used the data obtained to constrain the timing and origin of granitc rocks. The Chiwawu pluton shows obviously textural and compositional variation from theinner part to the outer part, ranging from porphyritic granodiorite at the inner part, granodiorite at the transition part to quartz dioriteat the periphery and several porphyry dykes. These new zircon LA- ICPMS U- Pb analyses of quartz diorite, granodiorite,porphyritic granodiorite and granodiorite porphyry dyke yielded excellent concordant ages of 134 ± 1 Ma, 133 ±1 Ma,131 ±2 Maand 128 ±1 Ma, respectively, indicating that the Chiwawu pluton was formed during the Early Cretaceous period (134-131 Ma).Combined with available chronologic data, the authors recognized two regional magmatic-metallogenic events during the Mesozoictime in Northern Taihang Mountain.
作者 李瑞玲 段超 陈志宽 李伟 张志远 LI Rui-ling DUAN Chao CHEN Zhi-kuan LIWei ZHANG Zhi-yuan(Development and Research Center, China Geological Survey, Beijing 100037, China Key Laboratory of Metallogeny andMineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academyof Geological Sciences, Beijing 100037, China Baoding Institute of Geological Engineering and Explorationof Hebei Province, Baoding 071051, Hebei, China)
出处 《中国地质》 CAS CSCD 北大核心 2016年第5期1761-1770,共10页 Geology in China
基金 中国地质调查局地质调查工作项目(12120113093600)资助~~
关键词 太行山北段 赤瓦屋岩体 铜钨矿 锆石U-PB年龄 Northern Taihang Mountain Chiwawuv pluton Cu-Woccurence zircon U-Pb dating
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