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Article Dans Une Revue Geology Année : 2019

Miocene fire intensification linked to continuous aridification on the Tibetan Plateau

Résumé

Although fire is considered an important factor in global vegetation evolution and cli- mate change, few high-resolution Miocene fire records have been obtained worldwide. Here, two independent micro-charcoal–based fire records from the northern Tibetan Plateau were analyzed; both show similar trends in micro- charcoal concentrations through time, with low abundances in the warmer Middle Miocene Climate Optimum (18–14 Ma) followed by a continuous increase throughout the late Mio- cene (14–5 Ma) cooling. Our detailed statistical analyses show that the micro-charcoal concen- tration trend is highly positively correlated to the trend in oxygen isotopes (δ18O, r = 0.94) and xerophytic species (%Xero, r = 0.95). We propose that the intensified fire frequency on the Tibetan Plateau mainly originated from the forest-steppe ecotone as a result of the continuous aridifica- tion in winter driven by the global cooling and decreased atmospheric pCO2 that occurred dur- ing 18–5 Ma, with a secondary control by the tectonic activity of the northern Tibetan Plateau.
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Dates et versions

hal-02095433 , version 1 (27-02-2024)

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Yunfa Miao, Fuli Wu, Sophie Warny, Xiaomin Fang, Haijian Lu, et al.. Miocene fire intensification linked to continuous aridification on the Tibetan Plateau. Geology, 2019, 47 (4), pp.303-307. ⟨10.1130/G45720.1⟩. ⟨hal-02095433⟩
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