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首页> 外文期刊>Contributions to Mineralogy and Petrology >SHRIMP and electron microprobe chronology of UHT metamorphism in the Napier Complex, East Antarctica: implications for zircon growth at >1,000 °C
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SHRIMP and electron microprobe chronology of UHT metamorphism in the Napier Complex, East Antarctica: implications for zircon growth at >1,000 °C

机译：南极东部纳皮尔复合体中UHT变质的SHRIMP和电子微探针年代学：对> 1,000°C的锆石生长的影响

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摘要

Zircons in ultra-high-temperature (UHT) metamorphosed paragneisses from Mt. Riiser-Larsen in the Napier Complex, East Antarctica, were dated by using ion microprobe (SHRIMP) and electron microprobe (EMP). Both SHRIMP and EMP analyses yield consistent 2520–2460 Ma age populations for garnet–orthopyroxene-bearing paragneiss and leucosomes enclosed within. The peak UHT event was dated at 2480 Ma by SHRIMP analyses on metamorphic zircons from the garnet–orthopyroxene paragneiss and those on magmatic zircons from the leucosomes which are interpreted to be formed at syn-UHT. As obtained by SHRIMP, the UHT metamorphic event was terminated no later than 2460 Ma. Minor 2520-Ma SHRIMP age suggests either the onset of prograde metamorphism or another high-grade metamorphic event unrelated to the UHT. EMP analyses on metamorphic zircons from sapphirine–quartz and osumilite-bearing magnesian paragneisses give c. 2500–2450 Ma ages. Inherited igneous zircon cores of the magnesian paragneisses yield relatively scattered EMP ages ranging over c. 3000–2650 Ma, suggesting that igneous materials of these ages sourced the protoliths of the paragneisses and that they were deposited during the interval c. 2650–2520 Ma.
机译：超高温（UHT）变质的帕拉尼萨斯山中的锆石。通过使用离子微探针（SHRIMP）和电子微探针（EMP）确定了南极东部纳皮尔复合体中的Riiser-Larsen。 SHRIMP和EMP分析均能得出2520-2460 Ma年龄的人群中封闭的石榴石-邻苯二甲氧基帕雷格尼斯菌和白细胞的总数。通过SHRIMP分析，石榴石-邻位邻苯并茂氧化锆的变质锆石和隐性脂质体的岩浆锆石的SHRIMP分析表明，UHT的峰值事件发生在2480 Ma，据解释是在Syn-UHT形成的。如通过SHRIMP获得的，UHT变质事件在不超过2460 Ma时终止。 2520-Ma SHRIMP年龄较小表明，要么发生了渐进性变质，要么发生了另一种与UHT不相关的高级变质事件。对蓝宝石-石英和含osumlite镁质纵隔石的变质锆石进行EMP分析得出c。 2500-2450 Ma年龄。镁质石蜡的继承火成锆石核产生相对分散的EMP年龄，范围超过c。 3000-2650 Ma，表明这些年龄的火成岩物质是伴生石长石的原石，并且它们是在间隔c内沉积的。 2650–2520马。

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    《Contributions to Mineralogy and Petrology》 |2004年第1期|1-20|共20页
  • 作者

    Tomokazu Hokada; Keiji Misawa; Kazumi Yokoyama; Kazuyuki Shiraishi; Akira Yamaguchi;

  • 作者单位

    National Institute of Polar ResearchDepartment of Polar Science the Graduate University for Advanced Studies;

    National Institute of Polar ResearchDepartment of Polar Science the Graduate University for Advanced Studies;

    National Science Museum;

    National Institute of Polar ResearchDepartment of Polar Science the Graduate University for Advanced Studies;

    National Institute of Polar ResearchDepartment of Polar Science the Graduate University for Advanced Studies;

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