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首页> 外文期刊>Journal of Asian earth sciences >A revisit to the Yorii jadeite-quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis
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A revisit to the Yorii jadeite-quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

机译：日本中部关东山脉约里翡翠石英岩的再造：对成岩作用的启示

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摘要

The jadeite-quartz rock (or jadeitite) from the Yorii area, the Kanto Mountains, central Japan occurs in greenstone melange subjected to metamorphism related to the Sanbagawa event. This rock was previously suggested to have formed through "vein precipitation" process contemporaneous with the Jurassic accretionary event. Mineral inclusions in zircons from this jadeite-quartz rock were re-examined in this study. The results clearly showed that these zircons contain mineral inclusions of both primary (igneous) and secondary (metasomatic) origin. The former are not present in matrix of the jadeite-quartz rock and the latter are pseudo-inclusions. These zircons are thus inherited or incompletely recrystallized ones. The geochemical characteristics of these zircons, including Th/U ratio and Ce anomaly, are also in accord with this conclusion. The jadeite-quartz rock should therefore have formed through "wholesale metasomatic replacement" process at an age younger than 141 Ma from a protolith of probable igneous origin aged at 162.2 +/- 0.6 Ma.
机译：来自日本中部关东山脉约里地区的翡翠石英岩（或翡翠岩）发生在绿岩混杂岩中，该混杂岩经历了与三叶川事件有关的变质作用。以前曾有人建议该岩石是通过侏罗纪增生事件的“静脉沉淀”过程形成的。在这项研究中，对这种翡翠-石英岩石中的锆石中的矿物包裹体进行了重新检查。结果清楚地表明，这些锆石包含主要（火成岩）和次要（元气溶胶）来源的矿物包裹体。前者不存在于翡翠石英岩的基质中，后者是伪夹杂物。这些锆石因此被继承或未完全重结晶。这些锆石的地球化学特征，包括Th / U比和Ce异常，也符合这一结论。因此，翡翠-石英岩石应通过“批发变质置换”过程从年龄可能为火成岩的原生岩中年龄为162.2 +/- 0.6 Ma的原生石中形成，年龄小于141 Ma。

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