加拿大新斯科舍省哈利法克斯群下奥陶统拉姆斯登坝和蓝石采石场地层、物源及构造环境

IF 1.2 4区 地球科学 Q2 GEOLOGY
Hayley, D., Pothier, John, F. W., Waldron, Chris, E., White, S., Andrew Dufrane, Rebecca, A., Jamieson
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引用次数: 12

摘要

Meguma地体的寒武纪至奥陶纪变质碎屑沉积岩在加拿大大西洋其他地区没有对应关系,但与北威尔士的序列相似。在Meguma地体中,寒武系Goldenville群以砂岩为主,上覆以细粒板岩和粉砂岩为主的Halifax群。在哈利法克斯群内,广泛分布的弗龙纪黑色板岩单元被灰色单元覆盖,这些单元具有罕见的早奥陶世化石,被划分为侧向等效的Bear River, Feltzen, Bluestone Quarry, Lumsden Dam和Glen Brook组。此处定义的蓝石采石场组的类型剖面位于哈利法克斯半岛,其中有四个组成成员;在沃尔夫维尔附近的拉姆斯登水坝地区,这里定义了拉姆斯登水坝组的类型剖面。从拉姆斯登坝组样品中提取的碎屑锆石显示出与下伏Goldenville群相似的年龄范围,包括丰富的新元古代锆石,代表阿瓦洛尼亚或泛非洲的来源,以及一组突出的1.95 - 2.2 Ga之间的峰值,可能代表西非的来源。从哈利法克斯以东的格伦布鲁克组采集的样本显示了类似的分布。与相关的威尔士序列相比,早奥陶世样品中没有发现中元古代锆石的流入,这表明,如果这两个盆地在寒武纪非常接近,那么它们在早奥陶世就分道扬镳了,这可能是冈瓦纳边缘走滑运动的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stratigraphy, provenance and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada
Cambrian to Ordovician metamorphosed clastic sedimentary rocks of the Meguma terrane have no correlatives elsewhere in Atlantic Canada but are similar to successions in North Wales. In the Meguma terrane, the Cambrian Goldenville Group, dominated by sandstone, is overlain by the Halifax Group, consisting mainly of fine-grained slate and siltstone. Within the Halifax Group widespread Furongian black slate units are overlain by greyer units with rare Early Ordovician fossils, assigned to the laterally equivalent Bear River, Feltzen, Bluestone Quarry, Lumsden Dam and Glen Brook formations. The type section of the Bluestone Quarry Formation, here defined, is on Halifax Peninsula, where four constituent members are recognized; the type section of the Lumsden Dam Formation is here defined in the Lumsden Dam region near Wolfville. Detrital zircons extracted from a sample of the Lumsden Dam Formation show a range of ages similar to those displayed by the underlying Goldenville Group, including abundant Neoproterozoic zircon representing Avalonian or Pan-African sources, and a prominent group of peaks between 1.95 and 2.2 Ga, probably representing sources in West Africa. A sample from the Glen Brook Formation east of Halifax shows a similar distribution. In contrast to the correlative Welsh successions, no influx of Mesoproterozoic zircon is seen in Early Ordovician samples, suggesting that, if the two basins were in close proximity in the Cambrian, they had diverged by the Early Ordovician, possibly as a result of strike-slip motion along the margin of Gondwana.
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来源期刊
Atlantic Geology
Atlantic Geology GEOLOGY-
CiteScore
2.10
自引率
18.80%
发文量
0
审稿时长
>12 weeks
期刊介绍: Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.
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