Inauguration of the GSSP for the Jurassic System
Inauguration of the GSSP for the Jurassic System
复制标题
侏罗纪系统 GSSP 落成
DOI：
10.18814/epiiugs/2012/v35i2/003
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
N. Morton
中科院分区：
文献类型：
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作者：
N. Morton
由于多种地质因素，在侏罗系底部的全球层型剖面和点（GSSP）处正式定义三叠纪-侏罗纪边界被证明是困难的。其中包括重大灭绝事件、全球海平面重大下降以及广泛的构造和火山事件的古地理和古生态后果。历史上，边界的位置一直存在争议。 1984 年，国际侏罗纪地层小组委员会 (ISJS) 成立了一个工作组来调查和记录可能的候选地点，并最终选择一个提议给 ISJS 作为 GSSP。在该过程结束时，工作组成员在 2008 年 2 月至 4 月期间对涉及 5 个部分和 4 个可能的关键标记事件的六项提案进行了评估和投票。奥地利的 Kuhjoch 部分的关键标记事件是菊石 Psiloceras spelae tirolicum 的首次出现，已提交给 ISJS。该提案于 2008 年 6 月被 ISJS 接受，2009 年 5 月被国际地层委员会接受，并于 2010 年 4 月被 IUGS 批准。2011 年 8 月，GSSP 在现场举行的仪式上正式落成，并放置了永久标记“金钉”。
Formal definition of the Triassic-Jurassic boundary at a Global Stratotype Section and Point (GSSP) for the base of the Jurassic System proved to be difficult because of several geological factors. These include a major extinction event, a major global sea-level fall and the palaeogeographical and palaeoecological consequences of widespread tectonic and volcanic events. Historically the position of the boundary has been controversial. In 1984 the International Subcommission on Jurassic Stratigraphy (ISJS) set up a Working Group to investigate and document possible candidate sites and eventually select one to be proposed to ISJS as GSSP. At the end of the process six proposals, involving five sections and four possible key marker events were assessed and voted on by the members of the Working Group between February and April 2008. The Kuhjoch section in Austria, with key marker event the first occurrence of the ammonite Psiloceras spelae tirolicum, was proposed to ISJS. The proposal was accepted by ISJS in June 2008, by the International Commission on Stratigraphy in May 2009 and ratified by IUGS in April 2010. In August 2011 the GSSP was formally inaugurated during a ceremony on site by the placing of a permanent marker, the "golden spike".