Time-calibrated Milankovitch cycles for the late Permian.

Time-calibrated Milankovitch cycles for the late Permian.
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二叠纪晚期的米兰科维奇周期时间校准

DOI:
10.1038/ncomms3452
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发表时间:
2013
影响因子:
16.6
通讯作者:
Yang, Tianshui
Yang, Tianshui
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wu, Huaichun;Zhang, Shihong;Hinnov, Linda A.;Jiang, Ganqing;Feng, Qinglai;Li, Haiyan;Yang, Tianshui

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地球科学的一项重要创新是天文时间尺度。天文时标基于米兰科维奇强迫地层学,该地层学已根据古气候强迫的天文模型进行了校准;它是针对新生代-中生代的大部分区域而定义的。然而,对于古生代,由于缺乏高精度的地质年代学或天文模型,天文强迫尚未得到广泛探索。在这里,我们报告了中国南方眉山和上思晚二叠世(洛平阶)地层的米兰科维奇旋回,时间通过最近的高精度 U-Pb 测年校准。这些证据扩展了 2.5 亿年前地球天文参数的经验知识。观测到的倾角和进动项支持 22 小时的日长。重建的天文时间尺度表明洛平纪的持续时间为 779.3 万年,此时强烈的 405 kyr 周期限制了天文建模。这是定义古生代天文时间尺度的第一个重大进展,以绝对时间为基础,弥合了古生代-中生代的过渡。
An important innovation in the geosciences is the astronomical time scale. The astronomical time scale is based on the Milankovitch-forced stratigraphy that has been calibrated to astronomical models of paleoclimate forcing; it is defined for much of Cenozoic–Mesozoic. For the Palaeozoic era, however, astronomical forcing has not been widely explored because of lack of high-precision geochronology or astronomical modelling. Here we report Milankovitch cycles from late Permian (Lopingian) strata at Meishan and Shangsi, South China, time calibrated by recent high-precision U–Pb dating. The evidence extends empirical knowledge of Earth’s astronomical parameters before 250 million years ago. Observed obliquity and precession terms support a 22-h length-of-day. The reconstructed astronomical time scale indicates a 7.793-million year duration for the Lopingian epoch, when strong 405-kyr cycles constrain astronomical modelling. This is the first significant advance in defining the Palaeozoic astronomical time scale, anchored to absolute time, bridging the Palaeozoic–Mesozoic transition.
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发表时间: 2006-09-01
期刊: EPISODES
影响因子: 3.1
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DOI: 10.1002/gj.1220
发表时间: 2010-03-01
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期刊: GEOLOGIC TIME SCALE 2012, VOLS 1 & 2
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作者:
Hinnov, L. A.;Hilgen, F. J.
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DOI: 10.1126/science.289.5478.432
发表时间: 2000-07-21
期刊: SCIENCE
影响因子: 56.9
作者:
Jin, YG;Wang, Y;Erwin, DH
通讯作者: Erwin, DH