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首页> 外文期刊>Chinese science bulletin >SHRIMP U-Pb zircon dating of the uppermost Cretaceous Furao Formation near the Heilong River:An age closest to the K/T boundary
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SHRIMP U-Pb zircon dating of the uppermost Cretaceous Furao Formation near the Heilong River:An age closest to the K/T boundary

机译：黑龙河附近最上层白垩纪呋喃组的SHRIMP U-Pb锆石年代：最接近K / T边界的年龄

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摘要

Since Alvarez et al. suggested that the presence of a large iridium concentration anomaly in sediments at the Cretaceous-Tertiary (K-T) boundary was evidence of a large bolide impact at this time that cause the K-T mass extinction, much attention has been paid to the precise age of this boundary with important geological event, mass extinction of organism and their mechanistic link. During the K-T boundary time, shocked quartz and microspherules were widely distributed in America, which were genetically related to the synchronous Chicxulub crater on the Uucatan Peninsula of Mexico. These findings indicate that the K-T mass extinction was most likely caused by an extraterrestrial impact at about 65 or 66.5 Ma. On the other hand , large explosive gas release from cratonic lithosphere triggered by mantle plume activity is considered as the main reason of the major mass extinctions during Phanerozoic time including the K-T boundary. In addition, the K-T mass extinction is also probably caused by multiple impacts of small planets with volcanic explosions.In comparison with marine K-T Global Standard Section and Point (GSSP), investigations of non-marine K-T boundary clay with iridium anomaly in Asia.
机译：由于阿尔瓦雷斯等。提示白垩纪-第三纪（KT）边界沉积物中存在大量铱浓度异常现象，证明了此时发生的大型硼化物撞击导致KT块灭绝，对此边界的确切年龄已引起了广泛关注与重要的地质事件，生物的大规模灭绝及其机制联系。在K-T边界时间内，震惊的石英和微球在美国广泛分布，与墨西哥Uucatan半岛上的同步Chicxulub陨石坑在遗传上有关。这些发现表明，K-T灭绝很可能是由大约65或66.5 Ma的地外撞击引起的。另一方面，由地幔柱活动引起的克拉通岩石圈大量爆炸性气体释放被认为是包括K-T边界在内的古生代发生大规模绝灭的主要原因。此外，K-T的大灭绝也可能是由于小行星多次受到火山爆炸的影响所致。与海洋K-T全球标准断面和点（GSSP）相比，亚洲对具有铱异常的非海洋K-T边界黏土的研究。

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