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首页> 外文期刊>South African journal of geology >Precise U/Pb age determination with baddeleyite (ZrO_2), a case study from the Phalaborwa Igneous Complex, South Africa
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Precise U/Pb age determination with baddeleyite (ZrO_2), a case study from the Phalaborwa Igneous Complex, South Africa

机译:稀土铅矿(ZrO_2)的精确U / Pb年龄测定,来自南非Phalaborwa火成岩复合体的案例研究

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摘要

U/Pb analyses of baddeleyite from the Phalaborwa Igneous Complex, South Africa, yield a precise age of 2060.6 ± 0.5 Ma that has been reproduced with two different isotopic tracers, one enriched in ~(205)Pb and ~(233)U, the other in ~(202)Pb and ~(233)U. The initial Pb concentration of baddeleyite is < 0.2 ppm, whereas the U concentration is in the range of several hundreds of ppm. The high mother/daughter isotope ratio is thus favourable for U/Pb dating. The highly radiogenic composition of the Pb as it is expressed by the high ~(206)Pb/~(204)Pb ratios of up to 50 000 and the high degree of concordance prove the suitability of baddeleyite for U/Pb dating. The high precision of the age presented in this study should encourage the use of this mineral to decipher the age relationships of individual intrusions of major igneous episodes such as the ~2060 Ma old period in southern Africa.
机译:南非Phalaborwa火成岩地块中的铅锌矿的U / Pb分析得出的精确年龄为2060.6±0.5 Ma,已通过两种不同的同位素示踪剂重现,其中一种富含〜(205)Pb和〜(233)U, 〜(202)Pb和〜(233)U中的其他元素。铅锌矿的初始Pb浓度<0.2 ppm,而U浓度在数百ppm的范围内。因此,高的母/子同位素比有利于U / Pb测年。 Pb的高放射源组成由高至约50000的高〜(206)Pb /〜(204)Pb比和高度的一致性所表示,证明了Baddeleyite适用于U / Pb定年。在这项研究中提出的高精度年龄应该鼓励使用这种矿物来破译主要火成岩事件(如南部非洲的〜2060 Ma晚期)的单个侵入体的年龄关系。

著录项

  • 来源
    《South African journal of geology》 |1995年第1期|p.1-4|共4页
  • 作者

    T. Reischmann;

  • 作者单位

    Institut fuer Geowissenschaften, Johannes Gutenberg-Universitaet, Becherweg 21, D-55099 Mainz, Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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