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Hidden Middle Devonian Magmatism of North-Eastern Siberia: Age Constraints from Detrital Zircon U–Pb Data
Minerals ( IF 2.5 ) Pub Date : 2020-10-01 , DOI: 10.3390/min10100874
Victoria B. Ershova , Andrei V. Prokopiev , Andrei K. Khudoley

We present new data on the tectonic evolution of north-eastern Siberia using an integrated provenance analysis based on U–Pb detrital zircon dating and sandstone petrography of Devonian sedimentary strata. Our petrographic data suggest that Upper Devonian sandstones of north-eastern Siberia were derived from a local provenance, supported by the widespread distribution of ca. 1900–2000 Ma magmatic events in the basement of the neighboring Ust’-Lena and Olenek uplifts. Devonian detrital zircon age distributions of the Devonian sandstones are similar to ages of Middle Paleozoic magmatic rocks of Yakutsk-Vilyui large igneous province (LIP). Therefore, we suggest that the studied sandstones were derived from proximally-located uplifted blocks composed of Proterozoic–Devonian rocks and Middle–Late Devonian volcanics. Moreover, the abundance of Middle–Late Devonian zircons is suggestive of a wider distribution of coeval magmatism across north-eastern Siberia than previously supposed. We propose that widespread Devonian magmatism associated with the Yakutsk-Vilyui LIP also occurred to the east of our study area and is now buried beneath thick Carboniferous–Jurassic sedimentary rocks of the eastern Siberian passive margin, subsequently deformed into the Late Jurassic–Cretaceous Verkhoyansk fold-and-thrust belt. We also propose that the major pulse of the Yakutsk-Vilyui LIP occurred in north-eastern Siberia during the Middle Devonian at ca. 390 Ma, some 15 million years earlier than within the Vilyui rift basin in eastern Siberia (ca. 375 Ma).

中文翻译:

西伯利亚东北部隐伏的泥盆纪岩浆作用:来自碎屑锆石U-Pb数据的年龄约束

我们使用基于U–Pb碎屑锆石测年和泥盆纪沉积地层砂岩岩石学的综合物源分析,提供了西伯利亚东北部构造演化的新数据。我们的岩相学数据表明,西伯利亚东北部的上泥盆统砂岩是从当地物产获得的,大约受ca的广泛分布的支持。1900–2000年在邻近的Ust'-Lena和Olenek隆起的地下室发生了Ma岩浆事件。泥盆纪砂岩的泥盆纪碎屑锆石年龄分布与雅库茨克-维留伊大火成岩省(LIP)中古生界岩浆岩的年龄相似。因此,我们建议研究的砂岩是从近地隆起的块体中衍生出来的,该块体由元古生界-德文系岩石和中晚期泥盆纪火山岩组成。此外,中晚泥盆世锆石的丰富性表明,西伯利亚东北部的近代岩浆活动分布比以前想象的要广。我们认为与雅库茨克—维留伊LIP有关的泥盆纪广泛岩浆作用也发生在我们研究区的东部,现在被埋在西伯利亚东部被动边缘的厚石炭纪—侏罗纪沉积岩之下,随后变形为晚侏罗世—白垩纪Verkhoyansk褶皱推力带。我们还提出,雅库茨克-维尤伊LIP的主要脉动发生在西西伯利亚东北部,在中泥盆纪,大约在。390 Ma,比西伯利亚东部的维留伊裂谷盆地早1500万年(约375 Ma)。我们认为与雅库茨克—维留伊LIP有关的泥盆纪广泛岩浆作用也发生在我们研究区的东部,现在被埋在西伯利亚东部被动边缘的厚石炭纪—侏罗纪沉积岩之下,随后变形为晚侏罗世—白垩纪Verkhoyansk褶皱推力带。我们还提出,雅库茨克-维尤伊LIP的主要脉动发生在西西伯利亚东北部,在中泥盆纪,大约在。390 Ma,比西伯利亚东部的维留伊裂谷盆地早1500万年(约375 Ma)。我们认为与雅库茨克—维留伊LIP有关的泥盆纪广泛岩浆作用也发生在我们研究区的东部,现在被埋在西伯利亚东部被动边缘的厚石炭纪—侏罗纪沉积岩之下,随后变形为晚侏罗世—白垩纪Verkhoyansk褶皱推力带。我们还提出,雅库茨克-维尤伊LIP的主要脉动发生在西西伯利亚东北部,在中泥盆纪,大约在。390 Ma,比西伯利亚东部的维留伊裂谷盆地早1500万年(约375 Ma)。随后变形为晚侏罗世-白垩纪Verkhoyansk褶皱冲断带。我们还提出,雅库茨克-维尤伊LIP的主要脉动发生在西西伯利亚东北部,在中泥盆纪,大约在。390 Ma,比西伯利亚东部的维留伊裂谷盆地早1500万年(约375 Ma)。随后变形为晚侏罗世-白垩纪Verkhoyansk褶皱冲断带。我们还提出,雅库茨克-维尤伊LIP的主要脉动发生在西西伯利亚东北部,在中泥盆纪,大约在。390 Ma,比西伯利亚东部的维留伊裂谷盆地早1500万年(约375 Ma)。
更新日期:2020-10-02
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