Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event
Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event
复制标题
DOI：
10.1130/g25763a.1
复制
发表时间：
2009-09
期刊：
影响因子：
5.8
通讯作者：
M. Tejada;Katsuhiko Suzuki;J. Kuroda;R. Coccioni;J. Mahoney;N. Ohkouchi;T. Sakamoto;Y. Tatsumi
中科院分区：
文献类型：
--
作者：
M. Tejada;Katsuhiko Suzuki;J. Kuroda;R. Coccioni;J. Mahoney;N. Ohkouchi;T. Sakamoto;Y. Tatsumi
早白垩世的翁通爪哇海台形成的时间，几乎与最终导致海洋缺氧事件1（OAE1a）的海洋生物变化发生时间相同。此前有人提出这些事件之间存在因果联系，但一直缺乏直接证据。对意大利中部在OAE1a期间沉积的下阿普特阶 “塞利层” 黑色页岩进行的新锇（Os）同位素测量显示，在始于巴雷姆阶 - 阿普特阶界线之上、止于塞利层界线稍上方的200万年时间内，海洋中187Os/188Os比值出现两次负向偏移，这表明全球非放射性锇通量增加了一个数量级。这些结果与翁通爪哇海台早期和主要的喷发阶段相吻合。据估计，后一阶段短至约100万年，可能引发了广泛的海洋分层，从而触发了OAE1a。
The Early Cretaceous Ontong Java Plateau was emplaced at almost the same time as marine biotic changes that culminated in oceanic anoxic event 1 (OAE1a). A causative link between these events has been suggested, but direct evidence has been lacking until now. New Os isotope measurements across the Lower Aptian “Selli Level” black shale deposited during OAE1a in central Italy reveal two negative excursions in marine 187 Os/ 188 Os ratios within a period of 2 Ma starting above the Barremian-Aptian boundary and ending just above the Selli Level horizon, suggesting an order-of-magnitude increase in the global fl ux of unradiogenic Os. The results are consistent with early and major phases of eruption of the Ontong Java Plateau. The latter phase is estimated to have been as short as ~1 Ma and may have induced widespread oceanic stratifi cation that triggered OAE1a.