加拿大新不伦瑞克省大马南岛基底罗斯岛组花岗伟晶岩碎屑的新元古代U–Pb（锆石）和40Ar/39Ar（白云母）年龄

IF 1.2 4区地球科学 Q2 GEOLOGY

Atlantic Geology Pub Date : 2019-07-28 DOI:10.4138/ATLGEOL.2019.009

S. Barr, J. Mortensen

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引用次数: 2

摘要

来自大马南岛罗斯岛组底部砾岩的花岗质伟晶岩碎屑中的锆石颗粒表明其火成岩结晶年龄为664.1±4.6 Ma。碎屑中还含有大量可追溯到太古宙的更古老的遗传颗粒。同一碎屑中的白云母和另一个类似碎屑中的白云母的冷却年龄分别为607.0±3.7 Ma和619.6±4.1 Ma，为罗斯岛组主砾岩的最大沉积年龄提供了依据。缅因州Penobscot湾700英亩岛组的伟晶岩年龄相似，支持了基于新元古代石英岩和碳酸盐单元相似性的两个地区之间的早期相关性。

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Neoproterozoic U–Pb (zircon) and 40Ar/39Ar (muscovite) ages from granitic pegmatite clasts, basal Ross Island Formation, Grand Manan Island, New Brunswick, Canada

Zircon grains from a granitic pegmatite clast from conglomerate at the base of the Ross Island Formation on Grand Manan Island indicate an igneous crystallization age of 664.1 ± 4.6 Ma. The clast also contains abundant older inherited grains back to the Archean. Muscovite in the same clast and an additional similar clast yielded cooling ages of 607.0 ± 3.7 Ma and 619.6 ± 4.1 Ma, respectively, providing a maximum depositional age for the host conglomerate of the Ross Island Formation. The similarity in age to pegmatite in the Seven Hundred Acre Island Formation in Penobscot Bay, Maine, supports earlier correlations between the two areas based on similarities in Neoproterozoic quartzite and carbonate units.

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来源期刊

Atlantic Geology GEOLOGY-

CiteScore

2.10

自引率

18.80%

发文量

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.