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Terrestrial and marine organic matter evidence from a Cretaceous deep-sea chert of Japan: Implications for enhanced hydrological cycle during the Aptian OAE 1a
Global and Planetary Change ( IF 3.9 ) Pub Date : 2022-07-02 , DOI: 10.1016/j.gloplacha.2022.103886
Yuki Nakagawa, Julien Legrand, Maximilien Bôle, Rie S. Hori, Junichiro Kuroda, Hitoshi Hasegawa, Masayuki Ikeda

The early Aptian Oceanic Anoxic Event (OAE 1a; ca. 120 Ma) was accompanied by a massive eruption of the Ontong Java Plateau, doubling atmospheric pCO₂, 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.



中文翻译:

来自日本白垩纪深海燧石的陆地和海洋有机物证据:对 Aptian OAE 1a 期间水文循环增强的影响

早期的 Aptian 海洋缺氧事件 (OAE 1a; ca. 120 Ma) 伴随着 Ontong Java 高原的大规模喷发,大气p CO₂ 增加了一倍,海面温度升高了 4-8 °C。在这项研究中,我们尝试对来自五色浜遗址的 Hauterivian 到 Cenomanian 深海燧石进行孢粉学分析,并成功获得了以无定形有机质、有机和无机颗粒的聚集体以及角质层碎片为主要代表的多种微遗迹。一个 Hauterivian 和许多 Aptian 样本出乎意料地产生了陆生植物材料,例如树脂和带有管胞的木材碎片,这代表了来自深海中上层燧石的陆生植物微残骸的首次记录。木屑在负和正δ范围内的发生OAE 1a 期间的13 C 偏移可能与大气 CO 2 水平升高的间隔相关。我们还可以建议树脂的出现,主要是在早期 Aptian 负 δ 13的富含泥岩的燧石层段内C 峰和中上 Aptian 区间,可能与海平面下降的时期有关。类似的大规模树脂沉积事件与其他突然的气候破坏期间的水文循环加剧有关,例如卡尼期雨洪事件、三叠纪-侏罗纪边界和古新世-始新世热最大值。因此,深海燧石中陆地植物埋藏的增加可能与与水文循环增强相关的大量植物排放有关,例如在 OAE 1a 期间风暴加剧和/或一些海平面变化。

更新日期:2022-07-02
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