Exposure-age data from across Antarctica reveal mid-Miocene establishment of polar desert climate
Exposure-age data from across Antarctica reveal mid-Miocene establishment of polar desert climate
复制标题
来自整个南极洲的暴露年龄数据揭示了中新世中期极地沙漠气候的建立
作者:
Spector, Perry;Balco, Greg
High-elevation rock surfaces in Antarctica have some of the oldest cosmogenic-nuclide exposure ages on Earth, dating back to the Miocene. A compilation of all available3He,10Be, and21Ne exposure-age data from the Antarctic continent shows that exposure histories recorded by these surfaces extend back to, but not before, the mid-Miocene cooling at 14–15 Ma. At high elevation, this cooling entailed a transition between a climate in which liquid water and biota were present and could contribute to surface weathering and erosion, and a polar desert climate in which virtually all weathering and erosion processes had been shut off. This climate appears to have continued uninterrupted between the mid-Miocene and the present.
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DOI:
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发表时间:
1999
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