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Large environmental disturbances caused by magmatic activity during the Late Devonian Hangenberg Crisis
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.gloplacha.2020.103155
Agnieszka Pisarzowska , Michał Rakociński , Leszek Marynowski , Marek Szczerba , Marie Thoby , Mariusz Paszkowski , Maria Cristina Perri , Claudia Spalletta , Hans-Peter Schönlaub , Nina Kowalik , Manfred Gereke

Abstract A wide range of various proxies (e.g., mineralogy, organic carbon, inorganic geochemistry, C and Mo isotopes, and framboidal pyrite) were applied for interpretation of changing oceanic redox conditions, bioproductivity, and the regional history of magmatic activity. This resulted in internally consistent interpretation of the late Famennian Hangenberg Crisis in subtropical deepest water sites of the epeiric Rhenohercynian and Saxo–Thuringian basins, as well as more open sites of the Paleo-Tethys Ocean. High mercury concentrations were detected in all of the studied sections, with the highest values strata in the Carnic Alps (up to 20 ppm) and Thuringia (up to 1.5 ppm). The beginning of the Hg anomaly and the presence of pyroclastic material, indicate that local magmatic activity was initiated before the deposition of the Hangenberg Black Shale (HBS). The onset of the HBS deposition coincided with the expansion of phosphate-enriched, anoxic to euxinic waters during short-lived CO2-greenhouse spike of a warm–humid climate. Intensive magmatic activity was a trigger for climatic changes, an excessive eutrophication, and an accelerated burial of organic carbon during the Hangenberg transgressive pulse. The injection of catastrophic amounts of CO2, toxic elements and acids from volcanic activity could have led to acidification, mutation of spores, and episodes of mass mortality of marine plankton.

中文翻译:

晚泥盆世汉根堡危机期间岩浆活动引起的大环境扰动

摘要 广泛的各种替代指标(例如矿物学、有机碳、无机地球化学、C 和 Mo 同位素以及枝状黄铁矿)被用于解释不断变化的海洋氧化还原条件、生物生产力和岩浆活动的区域历史。这导致了对上层 Rhenohercynian 和 Saxo-Thuringian 盆地的亚热带最深水位点以及古特提斯洋更开放的地点的晚期法门阶汉根堡危机的内部一致解释。在所有研究的部分都检测到高汞浓度,最高值位于 Carnic 阿尔卑斯山(高达 20 ppm)和图林根(高达 1.5 ppm)。汞异常的开始和火山碎屑物质的存在,表明局部岩浆活动是在汉根堡黑页岩(HBS)沉积之前开始的。HBS 沉积的开始与在温暖潮湿气候的短期 CO2 温室峰值期间富含磷酸盐、缺氧到富氧水的扩张相吻合。强烈的岩浆活动是气候变化、过度富营养化和汉根伯格海侵脉冲期间有机碳埋藏加速的触发因素。火山活动产生的灾难性数量的二氧化碳、有毒元素和酸的注入可能导致酸化、孢子突变和海洋浮游生物大量死亡的事件。强烈的岩浆活动是气候变化、过度富营养化和汉根伯格海侵脉冲期间有机碳埋藏加速的触发因素。火山活动产生的灾难性数量的二氧化碳、有毒元素和酸的注入可能导致酸化、孢子突变和海洋浮游生物大量死亡的事件。强烈的岩浆活动是气候变化、过度富营养化和汉根伯格海侵脉冲期间有机碳埋藏加速的触发因素。火山活动产生的灾难性数量的二氧化碳、有毒元素和酸的注入可能导致酸化、孢子突变和海洋浮游生物大量死亡的事件。
更新日期:2020-07-01
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