ABSTRACT The Glenroy Complex and McKnee Intrusives, southeast Nelson, have previously been correlated with similar rocks in northern Fiordland: the Worsley Pluton of the Western Fiordland Orthogneiss and George Sound Paragneiss, and Mistake Diorite and Darran Leucogabbro, respectively. Two samples of the Glenroy Complex (Woodham Orthogneiss) and one from the McKnee Intrusives yielded laser ablation inductively-coupled plasma mass spectrometry (LA–ICP–MS) U–Pb zircon ages of 123.7 ± 1.4 and 121.9 ± 1.1 Ma, and 138.8 ± 1.3 Ma, respectively. These new ages fall within the ranges previously published for the Glenroy Complex, McKnee Intrusives and their northern Fiordland counterparts and, thus, provide further evidence for their correlation. An age of 116.3 ± 2.4 Ma was also determined for a post-metamorphic pegmatite–aplite dike, constraining metamorphism of the Woodham Orthogneiss to within 2.0–9.0 Ma following magmatic crystallisation. The time gap between crystallisation and metamorphism is similar to that of the Worsley Pluton (3.7–8.9 Ma), lending additional support for their direct correlation.

中文翻译：

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Nelson 东南部 Glenroy 杂岩体和 McKnee 侵入岩的新 U-Pb 锆石年龄：加强与峡湾北部的联系并限制变质作用的时间

摘要 Nelson 东南部的 Glenroy 杂岩体和 McKnee Intrusives 先前已与峡湾北部的类似岩石相关联：分别为峡湾西部 Orthogneiss 和 George Sound Paragneiss 的 Worsley Pluton，以及 Mistake Diorite 和 Darran Leucogabbro。Glenroy Complex (Woodham Orthogneiss) 的两个样品和 McKnee Intrusives 的一个样品产生的激光烧蚀电感耦合等离子体质谱 (LA-ICP-MS) U-Pb 锆石年龄分别为 123.7 ± 1.4 和 121.9 ± 1.1 Ma，以及 138。分别为 1.3 Ma。这些新年龄属于先前公布的 Glenroy Complex、McKnee Intrusives 及其北部峡湾对应物的范围，因此为它们的相关性提供了进一步的证据。还确定了变质后伟晶岩-阿普莱特岩脉的年龄为 116.3 ± 2.4 Ma，在岩浆结晶后将伍德姆正片麻岩的变质作用限制在 2.0-9.0 Ma 之内。结晶和变质之间的时间间隔与 Worsley Pluton (3.7-8.9 Ma) 相似，为它们的直接相关性提供了额外的支持。