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铜陵地区中酸性侵入岩年代学研究
引用本文:吴才来,周珣若,黄许陈,张成火,黄文明.铜陵地区中酸性侵入岩年代学研究[J].岩石矿物学杂志,1996,15(4):299-306.
作者姓名:吴才来  周珣若  黄许陈  张成火  黄文明
作者单位:中国地质科学院地质研究所,中国地质大学,安徽地矿局321地质队
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、RbSr法同位素年龄产生偏差的原因

关 键 词:Ar-Ar法年龄  侵入岩  铜陵

40Ar/39 Ar Chronology of Intrusive Rocks from Tongling
Wu Cailai.40Ar/39 Ar Chronology of Intrusive Rocks from Tongling[J].Acta Petrologica Et Mineralogica,1996,15(4):299-306.
Authors:Wu Cailai
Abstract: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 40 Ar/ 39 Ar age spectra, which is in accord with the regional metallogenic character that mineralization took place later than magmatic activity.
Keywords:Ar/    39  Ar Isotopic ages  intrusive rocks  Tongling
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