Evidence for Cretaceous-Paleogene boundary bolide “impact winter” conditions from New Jersey, USA
Evidence for Cretaceous-Paleogene boundary bolide “impact winter” conditions from New Jersey, USA
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DOI：
10.1130/g37961.1
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发表时间：
2016-08
期刊：
影响因子：
5.8
通讯作者：
J. Vellekoop;Selen Esmeray-Senlet;K. Miller;J. Browning;A. Sluijs;B. Schootbrugge;J. Damsté;H. Brinkhuis
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文献类型：
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作者：
J. Vellekoop;Selen Esmeray-Senlet;K. Miller;J. Browning;A. Sluijs;B. Schootbrugge;J. Damsté;H. Brinkhuis
白垩纪-古近纪(K-PG)界线(约66 Ma)突然而短暂的“冲击冬季”条件通常被认为是导致物种灭绝的主要机制，标志着非鸟类恐龙统治的结束。然而，到目前为止，只有有限的证据可以证明这种气候扰动。在这里，我们对新泽西古陆架(美国东北部)的三个浅层岩心进行了高分辨率TEX86有机古测温，以评估K-PG撞击后立即引发的气候扰动，并将这些短期事件置于长期气候演化的背景下。我们提供了K-PG撞击后立即由撞击引发的严重气候变冷的证据。这个所谓的“影响冬季”发生在白垩纪末期暖期之后的长期降温趋势上。
Abrupt and short-lived “impact winter” conditions have commonly been implicated as the main mechanism leading to the mass extinction at the Cretaceous-Paleogene (K-Pg) boundary (ca. 66 Ma), marking the end of the reign of the non-avian dinosaurs. However, so far only limited evidence has been available for such a climatic perturbation. Here we perform high-resolution TEX86 organic paleothermometry on three shallow cores from the New Jersey paleoshelf, (northeastern USA) to assess the impact-provoked climatic perturbations immediately following the K-Pg impact and to place these short-term events in the context of long-term climate evolution. We provide evidence of impact-provoked, severe climatic cooling immediately following the K-Pg impact. This so-called “impact winter” occurred superimposed on a long-term cooling trend that followed a warm phase in the latest Cretaceous.