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首页> 外文期刊>Journal of geodynamics >Detrital zircon (U-Th)/He ages from Paleozoic strata of the Severnaya Zemlya Archipelago: Deciphering multiple episodes of Paleozoic tectonic evolution within the Russian High Arctic
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Detrital zircon (U-Th)/He ages from Paleozoic strata of the Severnaya Zemlya Archipelago: Deciphering multiple episodes of Paleozoic tectonic evolution within the Russian High Arctic

机译：碎屑锆石（U-Th）/他来自Severnaya Zemlya群岛的古生代地层：破译俄罗斯高北极地区古生代构造演化的多个事件

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摘要

Combined (U-Th)/He and U-Pb detrital zircon geochronological data are reported from Ordovician to Devonian strata of the Severnaya Zemlya archipelago to address the paleogeography of the Kara Terrane in the Russian High Arctic. (U-Th)/He ages from all six samples analyzed were not reset after sediment deposition, indicating that detrital zircons carry information on the exhumation history in the source region of the clastic material. In Ordovician-Silurian strata, (U-Th)/He ages range from 583.8 +/- 46.7 to 429.0 +/- 34.3 Ma. These ages nicely coincide with significant regional exhumation during the Caledonian and Timanian orogenies. In addition, combined U-Pb and (U-Th)/He dating show that within the source region, zircons that were crystalized during the Timanian Orogeny (U-Pb ages 680-560 Ma) were likely exhumed during younger Caledonian events ((U-Th)/He ages of 455-495 Ma), suggesting potential overlap of these orogens within the source region. In Devonian strata, detrital zircon (U-Th)/He ages range from 517.2 +/- 41.38 to 332.9 +/- 26.6 Ma, with a peak age of ca. 375 Ma. This 375 Ma event may be correlated with either the Ellesmerian Orogeny or the terminal Solundian/Svalbardian stages of the Caledonian Orogeny.
机译：据报道，从Severnaya Zemlya群岛的奥陶纪到泥盆纪地层，结合了（U-Th）/ He和U-Pb碎屑锆石的年代学数据，以研究俄罗斯高北极地区卡拉地层的古地理。沉积物沉积后，所有六个样品的（U-Th）/ He年龄均未重置，表明碎屑锆石携带着碎屑物质来源地区的掘尸历史信息。在奥陶纪-lur柳纪地层，（U-Th）/ He年龄范围从583.8 +/- 46.7到429.0 +/- 34.3 Ma。这些年龄恰好与加里东和Timanian造山运动期间的重要区域发掘活动相吻合。此外，结合U-Pb和（U-Th）/ He测年表明，在源区内，在Timanian造山运动（U-Pb年龄680-560 Ma）期间结晶的锆石很可能在年轻的古苏格兰事件中被挖出（（ U-Th）/ He年龄为455-495 Ma），表明这些造山带在源区内可能重叠。在泥盆纪地层中，碎屑锆石（U-Th）/ He年龄范围从517.2 +/- 41.38到332.9 +/- 26.6 Ma，峰值年龄大约为75。 375毫安。 375 Ma事件可能与Ellesmerian造山运动或Caledonian造山运动的末次Solundian / Svalbardian阶段有关。

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