Zircon dating ties NE Atlantic sill emplacement to initial Eocene global warming
Zircon dating ties NE Atlantic sill emplacement to initial Eocene global warming
复制标题
锆石测年将东北大西洋基台位置与始新世初期全球变暖联系起来
DOI：
10.1144/0016-76492009-125
复制
发表时间：
2010
影响因子：
2.7
通讯作者：
F. Corfu
中科院分区：
文献类型：
--
作者：
H. Svensen;S. Planke;F. Corfu
摘要：在古新世-始新世最热期（PETM）期间，地球经历了由温室气体引起的快速全球变暖。然而，气体的来源存在争议。我们首次确定了挪威近海沃尔令盆地岩浆岩床的年龄。锆石 U-Pb 年龄为 55.6 ± 0.3 和 56.3 ± 0.4 Ma 表明基台就位与 PETM 同步，误差较小。这一发现强化了这样的假设：全球变暖是由大西洋东北部侵入体周围富含有机物沉积物加热产生的温室气体快速释放引发的，而不是由天然气水合物分解引起的。补充材料：U-Pb 数据可从 http://www.geolsoc.org.uk/SUP18392 获取。
Abstract: The Earth experienced rapid greenhouse gas induced global warming during the Palaeocene–Eocene thermal maximum (PETM). The source of the gas is, however, debated. We have, for the first time, determined the ages of magmatic sills in the Vøring Basin offshore Norway. Zircon U–Pb ages of 55.6 ± 0.3 and 56.3 ± 0.4 Ma demonstrate that sill emplacement was synchronous with the PETM within small errors. This discovery strengthens the hypothesis that global warming was triggered by rapid release of greenhouse gases generated by heating of organic-rich sediments around intrusions in the NE Atlantic rather than from dissociation of gas hydrates. Supplementary material: U–Pb data are available at http://www.geolsoc.org.uk/SUP18392.