文章基本信息

标题：An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation
本地全文：下载
作者：Ming-Xing Ling ; Ren-Bin Zhan ; Guang-Xu Wang 等
期刊名称：Solid Earth Sciences
印刷版ISSN：2451-912X
电子版ISSN：2451-912X
出版年度：2019
卷号：4
期号：4
页码：190-198
DOI：10.1016/j.sesci.2019.11.001
语种：English
出版社：Elsevier
摘要：laciation. However, robust geochronology of this interval is still lacking. Here we present four successive high-precision zircon UePb dates by isotope dilution thermal ionization mass spectrometry (ID-TIMS) for biostratigraphically well-constrained K-bentonites of a continuous Ordovician-Silurian boundary section at Wanhe, SW China. They include 444.65 ± 0.22 Ma (middle Dicellograptus complexus Biozone), 444.06 ± 0.20 Ma (lower Paraorthograptus pacificus Biozone), 443.81 ± 0.24 Ma (upper Tangyagraptus typicus Subzone), and 442.99 ± 0.17 Ma (upper Metabolograptus extraordinarius Biozone). Calculations based on sedimentation rates suggest a duration of 0.47 ± 0.34 Ma for the Hirnantian Stage, which is much shorter than previously thought (1.4 ± 2.05 Ma in the International Chronostratigraphic Chart ver. 2019/05). The new data also constrain the Hirnantian glacial maximum to ~0.2 Ma, supporting that its brevity and intensity probably triggered the EOME.
关键词：KeywordsenID-TIMSK-bentoniteEnd Ordovician mass extinction (EOME)Hirnantian stage