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铜陵地区中酸性侵入岩年代学研究
40Ar/39 Ar Chronology of Intrusive Rocks from Tongling
  
中文关键词:Ar-Ar法年龄 侵入岩 铜陵
英文关键词:Ar/39 Ar Isotopic ages intrusive rocks Tongling
基金项目:
作者单位
吴才来  
周珣若  
黄许陈  
张成火  
黄文明  
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中文摘要:
      本文选择了铜陵地区主要岩石类型的代表性岩体中黑云母为测定对象,准确地测定了侵入岩的40Ar/39Ar同位素年龄。测定结果表明,区内侵入岩的年龄均小于140Ma,属燕山晚期的产物,后期热事件为成矿时代,晚于岩浆侵入时代,在此基础上,分析了K Ar法、RbSr法同位素年龄产生偏差的原因。
英文摘要:
      Ar/39 Ar isotopic chronologic studies of intrusive rocks from Tongling area show that ages of these rocks are all younger than 140Ma and belong to Late Yanshanian period, with granodiorite, quartz monzodiorite, pyroxene monzodiorite and gabbro diabase being 139.8-137Ma, 137-135.8Ma, 138.2-136.6Ma and 133.7Ma respectively. On the basis of 40 Ar/39 Ar isotopic chronologic studies of these intrusive rocks, the authors have also dealt with their K Ar and Rb Sr isotopic ages, and pointed out that the age error was caused by the late hydrothermal alteration and the mixture between mantle magma and crustal magma. In addition, the mineralization ages are found to be close to the smaller ages in 40Ar/39 Ar age spectra, which is in accord with the regional metallogenic character that mineralization took place later than magmatic activity.
吴才来,周珣若,黄许陈,张成火,黄文明,1996,铜陵地区中酸性侵入岩年代学研究[J].岩石矿物学杂志,15(4):299~306.
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