海洋无氧事件2是由Kerguelen火山活动引发的
C A Walker-Trivett1,2, S Kender3,4, K A Bogus5
1Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK. cw725@exeter.ac.uk.
Nature communications
|June 15, 2024
概括
来自Kerguelen大火山区 (LIP) 的火山活动在海洋无氧事件2 (OAE2) 之前和同时发生. 脉冲峰表明LIP火山活动推动了气候和碳循环的变化,引发了OAE2.
科学领域:
- 地质化学 地质化学
- 古气候学 古气候学
- 板块构造学是一种板块构造学.
背景情况:
- 大型岩性地带 (LIP) 与全球变暖和碳循环中断有关,例如海洋无氧事件2 (OAE2) 和中期Cenomanian事件 (MCE).
- 这些事件的确切火山源和触发机制仍在争论中,之前的假设涉及加勒比海LIP或高北极LIP.
研究的目的:
- 为了确定与OAE2和MCE相关的火山活动的时间.
- 为了确定这些事件期间沉积物质的来源.
- 阐明火山活动在触发OAE2和MCE中的作用.
主要方法:
- 在门特尔盆地对沉积 (Hg) 度进行分析,以确定火山发生的时间.
- (Nd) 和 (Sr) 的同位素分析,以确定沉积物的来源.
- 将Hg数据与北半球记录进行比较.
主要成果:
- 门特尔盆地沉积物Hg度较高,超过北半球水平,表明Kerguelen LIP火山活动.
- 转向放射性同位素的转变表明,Kerguelen LIP高原在OAE2.2之前和期间升起.
- 有限的证据表明,火山活动并没有直接导致MCE,但在OAE2之前和期间脉冲Hg峰值是显著的.
结论:
- 在OAE2.2之前和期间,Kerguelen LIP火山活动和相关的高原升起是活跃的.
- 来自Kerguelen LIP的火山排放在推动气候和碳循环变化方面发挥了关键作用,最终触发了OAE2.
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