Zircon geochronology and geochemistry of the Ward Hunt pluton, Pearya terrane, Canadian High Arctic: Insights into its age, origin, and circum-Arctic Timanide connections

Zircon geochronology and geochemistry of the Ward Hunt pluton, Pearya terrane, Canadian High Arctic: Insights into its age, origin, and circum-Arctic Timanide connections
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加拿大高北极地区皮尔亚地体沃德亨特岩体的锆石年代学和地球化学:深入了解其年龄、起源和环北极蒂马尼德联系

DOI:
10.1007/s41063-020-00078-9
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发表时间:
2020
期刊:
Arktos
影响因子:
--
通讯作者:
McClelland, W.C.
McClelland, W.C.
中科院分区:
--
文献类型:
--
作者:
Malone, S.J.;McClelland, W.C.

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新元古代提马尼造山带的北方边缘被加里东造山带的古生代变形所截断。证据分散的Timanide造山带的影响是通过同期的构造活动,沉积岩中的碎屑锆石横跨北冰洋边缘记录。然而,直接将这些区域与加里东地区联系在一起,却受到了近端区域缺乏适当事件的阻碍。Ward Hunt岩体是位于Pearya岛北方Ward Hunt岛上的一个未标年代的正长-二长岩侵入体,其结晶年龄为542 ± 2 Ma。微量元素的数据表明,从火成岩锆石侵入老变质沉积岩的火山弧系统的一部分,由少年铪同位素签名和微量元素数据表明,侵入岩体。这些数据支持了Pearya弧和其他新元古代-寒武纪弧系统之间的联系,例如在北极阿拉斯加-楚科达和亚历山大弧中提出的联系。
The northern margin of the Neoproterozoic Timanide Orogen is truncated by Paleozoic deformation of the Caledonian Orogen. Evidence for dispersion of terranes affected by the Timanide Orogen is documented through contemporaneous tectonothermal activity, and by detrital zircon in sedimentary rock from across the Arctic Ocean margins. However, directly tying these terranes to the Caledonide realm is hindered by the paucity of appropriate events in proximal terranes. The Ward Hunt Pluton, a previously undated syenite–monzodiorite intrusion located on Ward Hunt Island, northern Pearya terrane, yields a crystallization age of 542 ± 2 Ma. Trace-element data from the igneous zircon suggest that the pluton intruded older metasedimentary rocks of the terrane as part of a volcanic arc system, indicated by juvenile Hf isotopic signatures and trace-element data. The data support links between the Pearya terrane and other Neoproterozoic–Cambrian arc systems, such as those proposed in Arctic Alaska-Chukota and the Alexander terrane.
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