Terrestrial and marine organic matter evidence from a Cretaceous deep-sea chert of Japan: Implications for enhanced hydrological cycle during the Aptian OAE 1a
Terrestrial and marine organic matter evidence from a Cretaceous deep-sea chert of Japan: Implications for enhanced hydrological cycle during the Aptian OAE 1a
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日本白垩纪深海燧石的陆地和海洋有机质证据：对 Aptian OAE 1a 期间水文循环增强的影响
DOI：
10.1016/j.gloplacha.2022.103886
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发表时间：
2022
影响因子：
3.9
通讯作者：
Ikeda Masayuki
中科院分区：
文献类型：
--
作者：
Nakagawa Yuki;Legrand Julien、Bole Maximilien;Hori Rie S.;Kuroda Junichiro;Hasegawa Hitoshi;Ikeda Masayuki
早期阿普第亚海洋事件（OAE 1a; ca。120 Ma）伴随着翁东爪哇高原的大规模喷发，使大气二氧化碳浓度加倍，并使海面温度升高4-8 °C。在这项研究中，我们试图从Goshikinohama网站的Hauterivian到Cenomanian深海硅质岩的孢粉分析，并成功地获得了各种微残留物，主要代表无定形有机质，有机和无机颗粒的聚合物，角质层碎片。一个奥特里阶和许多阿普梯阶样本意外地发现了陆地植物材料，如树脂和带有管胞的木材碎片，这是深海中上层燧石中陆地植物微遗骸的第一个记录。OAE 1a期间δ 13 C正负偏移范围内的木材碎片的出现与大气CO2浓度增加的时间间隔有关。我们还可以认为，树脂的出现，主要是在泥岩丰富的燧石层的早Aptian负δ 13 C峰和中，上Aptian间隔，可能与海平面下降的时期。类似的大规模树脂沉积事件与其他突然气候中断期间的水文循环增强有关，例如卡尼期洪积事件，三叠纪-侏罗纪边界和古新世-始新世最大热事件。因此，在深海燧石中的陆生植物埋藏的增加可能与大量的植物排放有关，这些植物排放与水文循环的增强有关，例如OAE 1a期间的风暴加剧和/或海平面变化。
The early Aptian Oceanic Anoxic Event (OAE 1a; ca. 120 Ma) was accompanied by a massive eruption of the Ontong Java Plateau, doubling atmosphericpCO₂, and increasing sea surface temperature by 4–8 °C. In this study, we attempted a palynological analysis of the Hauterivian to Cenomanian deep–sea chert from the Goshikinohama site, and successfully obtained a variety of microremains, mainly represented by amorphous organic matter, aggregations of organic and inorganic particles, and cuticle fragments. One Hauterivian and many Aptian samples unexpectedly yielded terrestrial plant material, such as resins and wood fragments with tracheids, which represent the first record of terrestrial plant microremains from deep-sea pelagic chert. The occurrence of wood fragments within the negative and positive δ13C excursions during the OAE 1a can be correlated with an interval of increased atmospheric CO₂ level. We can also suggest that the occurrence of resins, mainly within the mudstone-rich chert intervals of the early Aptian negative δ13C peak and the middle-upper Aptian interval, are possibly related with periods with sea-level drops. Similar massive resin deposition events have been linked with intensified hydrological cycling during other abrupt climatic disruptions, such as the Carnian Pluvial Event, the Triassic−Jurassic boundary, and the Paleocene−Eocene Thermal Maximum. Therefore, an increase of terrestrial plant burial in deep–sea chert is likely linked with a massive plant discharge related with enhanced hydrological cycles, such as intensified storms and/or some sea–level change during the OAE 1a.