Aptian and Albian atmospheric CO₂ changes during oceanic anoxic events: Evidence from fossil Ginkgo cuticles in Jilin Province, Northeast China

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• 作者：Yuewu Sun^a ; ^b ; ^{sunyuewu@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiang Li^b ; Guowei Zhao^c ; ^{zhaogw.syky@sinopec.com" class="auth_mail" title="E-mail the corresponding author} ; Huan Liu^d ; Yanlong Zhang^e
• 关键词：Carbon dioxide ; Stomatal parameter ; Ginkgo ; Aptian ; Albian ; Oceanic anoxic events
• 刊名：Cretaceous Research
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：62
• 期：Complete
• 页码：130-141
• 全文大小：5116 K

文摘

The Early Cretaceous was a time with super-greenhouse conditions and episodic global oceanic anoxic events. However, relative timing of atmospheric CO₂ emissions and oceanic anoxic events, and their causal relationships remain matters of debate. Using the stomatal index approach, well-preserved fossil cuticles of Ginkgo from the Lower Cretaceous Changcai Formation, eastern Jilin, and from the Lower Cretaceous Yingcheng Formation, central Jilin, Northeast China, were investigated to reconstruct atmospheric CO₂ concentrations during the Aptian and earliest Albian (Early Cretaceous). The results indicate that the CO₂ concentrations reached 1098–1142 ppmv (Carboniferous standardization) or 970–1305 ppmv (regression function) during the Aptian and earliest Albian. Our estimates of palaeoatmospheric CO₂ concentrations during the earliest Albian (OAE 1b) are slightly higher than the data between the early Aptian Selli (OAE 1a) and the middle Aptian Fallot OAEs; this may indicate the absence of any great emissions of CO₂ during the latest Aptian and earliest Albian.