| 河北丰宁县大草坪钼矿区岩体锆石U-Pb年龄研究 |
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| 引用本文：.2007.Zircon U-Pb ages of intrusive bodies in Dacaoping molybdenum ore district, Fengning County, Hebei Province [J].Mineral Deposits,26(6):634~642 |
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| 基金项目:天津市国土资源和房屋管理局〔津国土房科（2006）550号〕和天津华北地勘局科技创新项目〔津华勘（2005）210号〕 |
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| 中文摘要:大草坪钼矿属冀北上黄旗构造岩浆岩带钼多金属成矿带，对其赋矿围岩的年龄、矿床成因及类型一直存在争论。通过对岩浆结晶锆石及捕虏晶锆石U-Pb年龄研究，表明大草坪花岗岩岩浆结晶锆石U_Pb年龄为（220.0±1.7）Ma、（224.0±1.5）Ma和（232.7±1.5）Ma，作者据此重新厘定大草坪花岗岩成岩期为印支期，有别于1989年《河北省、北京市、天津市区域地质志》中厘定的燕山期。根据大草坪花岗闪长岩中岩浆结晶锆石U_Pb年龄（134.3±1.2）Ma和（140.0±1.5）Ma，重新厘定大草坪花岗闪长岩成岩期为燕山期，有别于前人厘定的海西期。表明本区含矿岩体来源于古老基底就地多期改造重熔。 |
| 中文关键词:地球化学 锆石U_Pb年龄 成岩年龄 大草坪钼矿床 丰宁 |
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| Zircon U-Pb ages of intrusive bodies in Dacaoping molybdenum ore district, Fengning County, Hebei Province |
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| Abstract:The Dacaoping molybdenum deposit is located in the molybdenum polymetallic ore-forming belt along the Shanghuangqi tectonic magmatic belt in northern Hebei. There are different viewpoints concerning the age of the ore-bearing rocks as well as the genesis and type of the molybdenum deposit. This paper gives new zircon dating information for wall rocks of the molybdenum deposit. The authors obtained age data of enveloped zircons.The zircon U-Pb ages of (220.0±1.7) Ma and (224.0±1.5) Ma for the granite in Dacaoping suggest the Indosinian period, whereas the zircon U-Pb ages of (134.3 ± 1.2) Ma and (140.0 ± 1.5) Ma for the granodiorite imply the Yanshanian period. The ages are different from those given in Regional Geology of Hebei Province, Beijing and Tianjin. It is thus concluded that the ore-bearing rock body was derived from the old basement and experienced repeated reformation and remelting. |
| keywords:geochemistry, zircon U-Pb age, rock-forming age, Dacaoping molybdenum deposit, Fengning County |
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