Calibrating the Guadalupian Series (Middle Permian) of South China
Calibrating the Guadalupian Series (Middle Permian) of South China
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华南瓜达鲁普阶（中二叠统）的标定
DOI：
10.1016/j.palaeo.2016.11.011
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发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Shen Shu-zhong
中科院分区：
文献类型：
--
作者：
Mu Lin;Zhang Yi-chun;Li Xian-hua;Shen Shu-zhong
瓜达卢佩纪是地球历史上最重要的时期之一，其特征是一系列全球性的地质和生物事件。然而，与华南乐平阶和三叠纪下统以及俄罗斯乌拉尔山脉南部奇苏拉阶的高精度年龄相比，它受放射性同位素年龄的约束很小。本文报道了巢湖地区龟峰组底部和下部三个灰层的CA-ID-TIMS和西姆斯U-Pb年代学研究结果。对A、C、D火山灰层中的锆石进行了西姆斯初步分析，获得了206 Pb/238 U年龄的加权平均值，依次为269.0 ± 1.4Ma（MSWD = 1.03，n = 31）、266.3 ± 2.2Ma（MSWD = 2.2，n = 29）和262.2 ± 1.7Ma（MSWD = 1.0，n = 20）。然而，高精度的U-Pb年代学的相同的灰层的CA-ID-TIMS方法点的西姆斯结果中的重要的不准确性，由于铅的损失在锆石。灰层A和灰层C的TIMS加权平均206 Pb/238 U年龄分别为272.95 ± 0.11Ma（MSWD = 1.9，n = 7）和271.038 ± 0.097Ma（MSWD = 2.2，n = 8）。灰层A的沉积年龄为272.95 ± 0.11Ma，是华南地区传统的Cisuralian-Guadalupian界线（CGB）年龄。新的年代学研究表明，华南瓜达卢普统的总持续时间为13.85 ± 0.52百万年，其瓜达卢普-乐平界线年龄为259.1 ± 0.5 Ma。新的年龄校准的基础上的瓜达卢佩系列isca。0.65（± 0.51）万年，比之前基于2016年国际年代地层图（ICC）和2012年地质时标（GTS）对CGB年龄和瓜达卢佩纪持续时间的估计要老，并且有所改进。
The Guadalupian Epoch represents one of the most critical intervals during the Earth history which is characterized by a series of global geological and biological events. However, it is poorly constrained by radioisotopic ages in comparison with the high-precision dates from the Lopingian and lowest Triassic in South China and the Cisuralian in southern Urals, Russia. In this study, we report combined CA-ID-TIMS and SIMS U-Pb zircon geochronology for three ash beds from the base and lower part of the Kuhfeng Formation in the Chaohu area, southeastern China. Zircons from Ash Beds A, C and D were initially analyzed by SIMS and yielded weighted mean206Pb/238U dates of 269.0 ± 1.4 Ma (MSWD = 1.03, n = 31), 266.3 ± 2.2 Ma (MSWD = 2.2, n = 29) and 262.2 ± 1.7 Ma (MSWD = 1.0, n = 20) in ascending order. However, high-precion U-Pb geochronology of the same ash beds by the CA-ID-TIMS method point to important inaccuracies in the SIMS results due to Pb-loss in zircons. Ash Beds A and C yielded two TIMS weighted mean206Pb/238U dates of 272.95 ± 0.11 Ma (MSWD = 1.9, n = 7) and 271.038 ± 0.097 Ma (MSWD = 2.2, n = 8), respectively. The depositional age of 272.95 ± 0.11 Ma for Ash Bed A is postulated as the traditional Cisuralian-Guadalupian boundary (CGB) age in South China. Our new geochronology suggests that the Guadalupian Series in South China had a total duration of 13.85 ± 0.52 myr given a Guadalupian-Lopingian boundary (GLB) age of 259.1 ± 0.5 Ma. The new age calibration of the base of the Guadalupian Series isca. 0.65 (± 0.51) myr older than – and improves upon – the previous estimates for the CGB age and the duration of the Guadalupian Epoch based on the 2016 International Chronostratigraphic Chart (ICC) and the 2012 Geologic Time Scale (GTS).
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影响因子：
6.1
作者：
R. Kryza;Q. Crowley;A. Larionov;C. Pin;T. Oberc-Dziedzic;K. Mochnacka
通讯作者：
R. Kryza;Q. Crowley;A. Larionov;C. Pin;T. Oberc-Dziedzic;K. Mochnacka
中国中二叠世的火山活动、生物大灭绝和碳同位素波动
影响因子：
56.9
作者：
Sun, Yadong;Lai, Xulong;Wignall, Paul B.;Ali, Jason R.;Jiang, Haishui;Vedrine, Stephanie;Bottrell, Simon H.;Newton, Robert J.;Izon, Gareth;Cope, Helen;Bond, David P. G.;Widdowson, Mike
通讯作者：
Widdowson, Mike
DOI：
--
发表时间：
1994
期刊：
--
影响因子：
--
作者：
Sheng Jinzhang;Jin Yugan
通讯作者：
Sheng Jinzhang;Jin Yugan
影响因子：
1.5
作者：
Xiangdong Wang;T. Sugiyama
通讯作者：
Xiangdong Wang;T. Sugiyama
影响因子：
3
作者：
T. Kani;M. Fukui;Y. Isozaki;S. Nohda
通讯作者：
T. Kani;M. Fukui;Y. Isozaki;S. Nohda