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Latest Carboniferous to early Permian volcano-stratigraphic evolution in Central Europe: U–Pb CA–ID–TIMS ages of volcanic rocks in the Thuringian Forest Basin (Germany)
International Journal of Earth Sciences ( IF 2.3 ) Pub Date : 2020-11-23 , DOI: 10.1007/s00531-020-01957-y
Harald Lützner , Marion Tichomirowa , Alexandra Käßner , Reinhard Gaupp

Mainly acidic Stephanian to early Permian volcanic rocks and intercalated sediments accumulated in the Thuringian Forest Basin (TFB) in central Germany to a total thickness of ca. 2000 m. This basin offers a wide range of biostratigraphic information. New high-precision U–Pb CA–ID–TIMS (chemical abrasion–isotope dilution–thermal ionization mass spectrometry) zircon data are obtained from volcanic rocks for the first time in the TFB. Pre-treatment of the zircons by chemical abrasion was important to get rid of severe Pb loss. The zircon ages of the investigated formations indicate that the total duration of the volcanic activity in the TFB was considerably shorter [ca. 4 Myr: from 300 Ma for the oldest formation (Möhrenbach) until ca. 296 Ma for the youngest volcanic-rock-bearing formation (Rotterode)] than suggested in previous studies (ca. 20 Myr; 295 Ma to 275 Ma). Consequently, the well-documented gap of the sedimentary record from the early Permian volcanic rocks up to the Illawarra geomagnetic reversal has to be extended to ca. 25 Myr from the previously proposed 5 Myr. The zircon ages of the investigated volcanic rocks allow the constraining of some intercalated fossiliferous horizons crucial for biostratigraphic correlation of latest Carboniferous–early Permian (Rotliegend) sections. The high-precision age data require a new interpretation of the evolution of the TFB but also offer the chance to obtain a more reliable comparison of the timing of the main magmatic activity across intramontane basins as well as to obtain links to the Standard Global Stratigraphic Scale.



中文翻译:

中欧的最新石炭纪至二叠纪早期火山地层演化:图林根森林盆地(德国)的火山岩U–Pb CA–ID–TIMS年龄

在德国中部的图林根森林盆地(TFB)中,主要为酸性Stephanian到二叠纪早期的火山岩,以及层积的沉积物,总厚度约为。2000米 该盆地提供了广泛的生物地层信息。TFB首次从火山岩中获得了新的高精度U–Pb CA–ID–TIMS(化学磨蚀–同位素稀释–热电离质谱)锆石数据。通过化学磨蚀对锆石进行预处理对于消除严重的铅损失非常重要。被调查地层的锆石年龄表明,TFB中火山活动的总持续时间要短得多[ca. 4 Myr:从最早的岩层(Möhrenbach)到300 Ma,直至大约 火山岩最年轻的地层(Rotterode)为296 Ma](比以前的研究建议的大约20 Myr;295马至275马)。因此,从早期的二叠纪火山岩到伊拉瓦拉地磁逆转的沉积记录的有据可查的差距必须扩大到大约。先前建议的5 Myr为25 Myr。被调查火山岩的锆石年龄限制了对最新石炭纪-早二叠世(Rotliegend)断层生物地层相关性至关重要的一些插层化石层位的约束。高精度年龄数据需要对TFB的演化进行新的解释,但也有机会获得更可靠的山间盆地主要岩浆活动时间对比,以及与标准全球地层尺度的联系。从早二叠纪火山岩到伊拉瓦拉地磁逆转的沉积记录的有据可查的差距必须扩大到大约。先前建议的5 Myr为25 Myr。被调查火山岩的锆石年龄限制了对最新石炭纪-早二叠世(Rotliegend)断层生物地层相关性至关重要的一些插层化石层位的约束。高精度年龄数据需要对TFB的演化进行新的解释,但也有机会获得更可靠的山间盆地主要岩浆活动时间对比,以及与标准全球地层尺度的联系。从早二叠纪火山岩到伊拉瓦拉地磁逆转的沉积记录的有据可查的差距必须扩大到大约。先前建议的5 Myr为25 Myr。被调查火山岩的锆石年龄限制了对最新石炭纪-早二叠世(Rotliegend)断层生物地层相关性至关重要的一些插层化石层位的约束。高精度年龄数据需要对TFB的演化进行新的解释,但也有机会获得更可靠的山间盆地主要岩浆活动时间对比,以及与标准全球地层尺度的联系。被调查火山岩的锆石年龄限制了对最新石炭纪-早二叠世(Rotliegend)断层生物地层相关性至关重要的一些插层化石层位的约束。高精度年龄数据需要对TFB的演化进行新的解释,但也有机会获得更可靠的山间盆地主要岩浆活动时间对比,以及与标准全球地层尺度的联系。被调查火山岩的锆石年龄限制了对最新石炭纪-早二叠世(Rotliegend)断层生物地层相关性至关重要的一些插层化石层位的约束。高精度年龄数据需要对TFB的演化做出新的解释,但也有机会获得更可靠的山间盆地主要岩浆活动时间对比,以及与标准全球地层尺度的联系。

更新日期:2020-11-23
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