| 40Ar(40Ar＊＋40ArE)、39Ar释气特征与过剩氩的甄别及年代学意义 |
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| 引用本文： | 李正华,戴童谟.40Ar(40Ar＊＋40ArE)、39Ar释气特征与过剩氩的甄别及年代学意义[J].地质科学,1995,30(1):40-46. |
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| 作者姓名： | 李正华 戴童谟 |
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| 作者单位： | 中国科学院地球化学研究所 贵阳 550002 |
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| 摘 要： | 对具有不同地质历史背景的3类40Ar/39Ar法样品中的40Ar和39Ar释出特征进行对比,研究结果表明,40Ar/39Ar法样品中的40Ar、39Ar释气曲线主要表现为以下3种形式:完全重合型、过剩氩型和不规则型。当40Ar与39Ar释气曲线呈完全重合型时,40Ar/39Ar法全熔年龄代表了岩体的形成年龄;当40Ar、39Ar释气曲线是过剩氩型时,40Ar/39Ar法全熔年龄则大于岩体的形成年龄;当40Ar与39Ar释气曲线呈不规则型时,表明样品中的放射成固氩(40Ar*)发生了丢失,其全熔年龄一般较岩体的形成年龄小。对于40Ar、39Ar释气曲线呈过剩氩型的样品,40Ar/39Ar法年龄谱通常呈马鞍形,且马鞍形年龄谱的底部年龄一般都具有地质意义,代表了岩体的形成年龄。对于40Ar、39Ar释气曲线呈不规则型的样品,对其年龄谱的解释应持谨慎态度。
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| 关 键 词： | 40Ar/39Ar法 过剩氩 释气曲线 扩散 |
| 收稿时间： | 1993-10-10 |
| 修稿时间： | 1993-10-10; |
THE RELEASE OF 40Ar(40Ar*+40ArE) AND39Ar IN 40Ar/39Ar SAMPLES AND ITS CHRONOLOGICALSIGNIFICANCE |
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| Li Zhenghua,Dai Tongmo, Qiu Huaning.THE RELEASE OF 40Ar(40Ar*+40ArE) AND39Ar IN 40Ar/39Ar SAMPLES AND ITS CHRONOLOGICALSIGNIFICANCE[J].Chinese Journal of Geology,1995,30(1):40-46. |
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| Authors: | Li Zhenghua Dai Tongmo Qiu Huaning |
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| Institution: | Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002 |
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| Abstract: | A suit of 40Ar/39Ar samples have been studied on the release of 40Ar(40Ar+ 40ArE) and 39Ar and show three patterns of curve of 4oAr and 39Ar released. The samples without excess 4oAr which have a sample geological history show a similar trend of 'oAr to s,Ar released. The samples which have undergone a complex history show a different trend of 'oAr and 39Ar release. A typical pattern of the behavior of 40Ar and 39Ar released from 40Ar/39Ar samples which have excess 40Ar is presented in this paper. The mechanism has been discussed in the text. |
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| Keywords: | 40Ar/39Ar dating" target="_blank">40Ar/39Ar dating')" href="#">40Ar/39Ar dating Excess 40Ar" target="_blank">40Ar')" href="#">Excess 40Ar Gas released curve Diffusion |
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