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首页> 外文期刊>Chinese science bulletin >Zircon SHRIMP U-Pb dating for the Cangshuipu volcanic rocks and its implications for the lower boundary age of the Nanhua strata in South China
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Zircon SHRIMP U-Pb dating for the Cangshuipu volcanic rocks and its implications for the lower boundary age of the Nanhua strata in South China

机译：苍水铺火山岩锆石SHRIMP U-Pb测年及其对华南南华地层下界年龄的影响

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摘要

The continental volcanic rocks and volcaniclas-tic sedimentary conglomerates of the Cangshuipu Formation occur well in Yiyang of Hunan Province, consisting of a wedge-shaped succession of Neoproterozoic strata that overlie with high-angle unconformity the flysch turbidites of the Lengjiaxi Group in the Upper Mesoproterozoic Eonothem. SHRIMP zircon U-Pb dating gives a weighted mean age of 814 ± 12 Ma for the dacitic volcanic agglomerates from the lowest part of the volcanic rocks in the Cangshuipu Formation. This age is younger than previously reported values of 921—933 Ma for the volcanic rocks from the Cangshuipu Formation. Our new dating represents the lower boundary age of the Neoproterozoic System in the studied area. The younger age for the Cangshuipu volcanic rocks is supported by the following observations: (1) Lower Neoproterozoic strata (814—1000 Ma) are missing in the studied area; (2) the Nanhua rift system was initiated at about 820 Ma; and (3) an age of -820 Ma may be taken as the lower boundary timing of the Nanhua System (even Neoproterozoic) in South China.
机译：苍水铺组的陆相火山岩和火山岩沉积砾岩好发于湖南益阳，由楔状的新元古代地层组成，并以高角度不整合面覆盖了中元古界上冷家溪群的复辉浊度。 Eonothem。 SHRIMP锆石U-Pb测年为苍水铺组火山岩最低层中的镁铁火山结块加权平均年龄为814±12 Ma。这个年龄比以前报道的苍水铺组火山岩的921-933 Ma年龄要小。我们的新测年代表了研究区新元古代系统的下限年龄。以下观测资料支持了苍水铺火山岩的年轻化：（1）研究区缺少新元古代下部地层（814-1000 Ma）； （2）南华裂谷系始于约820 Ma; （3）华南地区南华系统（甚至是新元古代）的下边界时间可能是-820 Ma。

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