美国哥伦比亚大学
据悉，三叠纪末的陆地灭绝（ETE）与大西洋中部岩浆省（CAMP）的初始熔岩同步，发生在可用于全球对比的短暂的26000kyr逆地磁极性事件Chron E23r之后。
研究人员收集了先前来自于摩洛哥和美国东北部报道的，逐个熔岩的古地磁长期变化数据，结合近期在加拿大芬迪盆地测定的北山玄武岩数据进行分析，数据显示，CAMP火山活动的初始阶段只发生在五个方向组或脉冲中，每个方向组或脉冲持续事件不到一个世纪。
根据现有的天文年代学和U-Pb年代学资料，研究人员探明，第一批四个定向群出现在约40kyr。CAMP火山活动的初始主要脉冲与ETE的重合表明，硫酸盐气溶胶引起的短暂的火山冬季反照率，可能是热带大陆地区物种灭绝的关键因素，而较松散的相关性则允许长期二氧化碳排放量，通过海洋酸化和长期变暖对海洋领域产生更长远的影响。
附：英文原文
Title: Correlation of sub-centennial-scale pulses of initial Central Atlantic Magmatic Province lavas and the end-Triassic extinctions
Author: Kent, Dennis V., Olsen, Paul E., Wang, Huapei, Schaller, Morgan F., Et-Touhami, Mohammed
Issue&Volume: 2024-10-28
Abstract: The end-Triassic extinction (ETE) on land was synchronous with the initial lavas of the Central Atlantic Magmatic Province (CAMP) and occurred just after the brief 26 thousand year (kyr) reverse geomagnetic polarity Chron E23r that can be used for global correlation. Lava-by-lava paleomagnetic secular variation data, previously reported from Morocco and northeastern United States combined with our data for the North Mountain Basalt from the Fundy Basin of Canada show that the initial phase of CAMP volcanism occurred in only five directional groups or pulses each occupying less than a century. The first four directional groups occur during a ~40 kyr period based on available astrochronology and U-Pb geochronology. The coincidence of the initial major pulse of CAMP volcanism with the ETE points to short-lived volcanic winters albedo-induced by sulfate aerosols as a plausible key agent of the extinctions in the tropical continental realm, whereas looser correlations allow prolonged CO2 emissions to contribute to more long-ranging effects in the marine realm via ocean acidification and longer-term warming.
DOI: 10.1073/pnas.2415486121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2415486121