Implications of reduced turbidity current and landslide activity for the Initial Eocene Thermal Maximum - evidence from two distal, deep-water sites
Implications of reduced turbidity current and landslide activity for the Initial Eocene Thermal Maximum - evidence from two distal, deep-water sites
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DOI：
10.1016/j.epsl.2015.03.022
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发表时间：
2015-06
影响因子：
5.3
通讯作者：
M. Clare;P. Talling;J. Hunt
中科院分区：
文献类型：
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作者：
M. Clare;P. Talling;J. Hunt
以前的研究表明，由于未来全球变暖的迅速发展，海底滑坡和浊流可能会变得更有可能。确定全球变暖是否会增加可能性有助于评估滑坡引发的海啸灾害和海底结构的风险。其他研究表明，由于天然气水合物的突然释放，山体滑坡有助于引发过去快速的气候变化。两个深水浊积岩记录显示，在初始始新世热最大期（IETM）期间，浊流活动的长期间断发生在距今55Ma。IETM代表了未来人为引起的气候变化的一个可能的代理。我们的记录很可能主要代表大型和快速移动的解体式海底滑坡。长期（> 230万年）记录的统计分析表明，IETM后浊流频率显着下降。我们的研究结果表明，快速的气候变化并不一定会导致浊流活动的增加，并没有提供证据滑坡作为IETM的主要触发因素。
Previous studies propose that submarine landslides and turbidity currents may become more likely due to future rapid global warming. Determining whether global warming increases likelihood assists in assessment of landslide-triggered tsunami hazards and risk to seafloor structures. Other studies propose that landslides helped to trigger past rapid climate change due to sudden release of gas hydrates. Two deep-water turbidite records show prolonged hiatuses in turbidity current activity during the Initial Eocene Thermal Maximum (IETM) at ∼55 Ma. The IETM represents a possible proxy for future anthropogenically-induced climate change. It is likely that our records mainly represent large and fast moving disintegrative submarine landslides. Statistical analysis of long term (>2.3 Myr) records shows that turbidity current frequency significantly decreased after the IETM. Our results indicate that rapid climate change does not necessarily cause increased turbidity current activity, and do not provide evidence for landslides as a primary trigger for the IETM.