首页|A synthesis of the Cretaceous wildfire record related to atmospheric oxvgen levels?
A synthesis of the Cretaceous wildfire record related to atmospheric oxvgen levels?
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The Cretaceous was a significant greenhouse period in Earth's history with higher atmospheric CO2 levels and temperatures than today.Although evidence of combustion has been widely described from the Cretaceous deposits,our understanding of the spatiotemporal diversification pattern and process of the Cretaceous wildfires is still limited.In this study,we comprehensively synthesize a total of 271 published Cretaceous wildfire occurrences based on the by-products of burning,including fossil charcoal,pyrogenic inertinite(fossil charcoal in coal),and pyrogenic polycyclic aromatic hydrocarbons(PAHs).Spatially,the dataset shows a distinctive distribution of reported wildfire evidence characterized by high concentration in the middle latitudinal areas of the Northern Hemisphere(30°N-60°N)over the Cretaceous.Temporally,an overall increasing trend of the reported wildfire data from the Early Cretaceous to the Late Cretaceous is coincident with higher atmospheric O2 levels.However,the spatial and temporal patterns may result from many types of factors,such as taphonomy,preservation,and researcher biases,instead of a real picture of the Cretaceous wildfire evolution.To better understand the spatiotemporal diversification of the Cretaceous wildfire,more investigations on the record of wildfire occurrences during this period would be necessary in the future.
Da-Wei Lü、Wen-Xu Du、Zhi-Hui Zhang、Yuan Gao、Tian-Tian Wang、Jin-Cheng Xu、Ao-Cong Zhang、Cheng-Shan Wang
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Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals,College of Earth Sciences and Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong Province,China
School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China
Institute of Earth Sciences,China University of Geosciences(Beijing),Beijing 100083,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Shandong ProvinceChinese Postdoctoral Science FoundationSDUST Research Fund,Shandong University of Science and Technology
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