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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A North American provenance for Neoproterozoic to Cambrian sandstones in Tasmania?
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A North American provenance for Neoproterozoic to Cambrian sandstones in Tasmania?

机译：北美在塔斯马尼亚的新元古代至寒武纪砂岩的起源？

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摘要

Tasmania forms an enigmatic province within the Neoproterozoic to Cambrian history of Australia. It lies at the boundary between Australia and North America in most Rodinia reconstructions but no reliable lithostratigraphic correlations have been reported with either mainland Australia or North America. We used detrital zircon age spectra, measured by LAM-ICP-MS, of Neoproterozoic and Cambrian sandstones in Tasmania to search for evidence of correlations with these two continental blocks during the time slice critical to Rodinia breakup. The Tasmanian sandstones are dominated by 1600-1900 Ma and 1200-1500 Ma age zircons. There is little evidence for Grenville (～1100 Ma) and Ross (～550 Ma) Orogen sources in these sandstones, in contrast to detrital zircon age spectra of similar age rocks in South Australia. The detrital zircon age spectra of Tasmanian sandstones are different from age spectra reported from British Columbia. They are very similar to age spectra reported from Cambrian sandstones of Nevada, supporting Rodinia reconstructions that place southwestern USA near to Tasmania in the Neoproterozoic.
机译：塔斯马尼亚州是澳大利亚新寒武纪至寒武纪时期的一个神秘省。在大多数Rodinia重建中，它位于澳大利亚和北美洲之间的边界，但尚未报告与澳大利亚大陆或北美洲的可靠岩石地层相​​关性。我们使用塔斯马尼亚州新元古代和寒武纪砂岩的碎屑锆石年龄谱（通过LAM-ICP-MS测量）来寻找对罗迪尼亚破裂至关重要的时间片与这两个大陆块相关的证据。塔斯马尼亚砂岩以1600-1900 Ma和1200-1500 Ma年龄的锆石为主。与南澳大利亚相似年龄岩石的碎屑锆石年龄谱相反，这些砂岩中没有Grenville（〜1100 Ma）和Ross（〜550 Ma）造山带来源的证据。塔斯马尼亚砂岩的碎屑锆石年龄谱与不列颠哥伦比亚省报道的年龄谱不同。它们与内华达州寒武纪砂岩报道的年龄光谱非常相似，支持了美国西南部靠近新元古代的塔斯马尼亚州的Rodinia重建。

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