A stable isotope record of late Cenozoic surface uplift of southern Alaska

A stable isotope record of late Cenozoic surface uplift of southern Alaska
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阿拉斯加南部晚新生代地表隆起的稳定同位素记录

DOI:
10.1016/j.epsl.2017.11.029
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发表时间:
2018
影响因子:
5.3
通讯作者:
Benowitz, Jeffrey A.
Benowitz, Jeffrey A.
中科院分区:
地球科学1区
文献类型:
--
作者:
Bill, Nicholas S.;Mix, Hari T.;Clark, Peter U.;Reilly, Sean P.;Jensen, Britta J.L.;Benowitz, Jeffrey A.

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尽管阿拉斯加南部晚新生代折返的加速时间被很好地限制为开始于∼5-∼6 Ma,但该地区的地表隆起史仍然知之甚少。为了评估与快速折返相关的地表抬升程度,我们利用阿拉斯加和育空地区内陆盆地最后一次δ7 Ma期间古大气水的氢同位素组成(∼D),开发了稳定的同位素记录。我们的记录来自硅质盖层中的自生粘土(δdClay),记录了从中新世晚期(∼6-∼7 Ma)到更新世-更新世过渡(∼2-∼3 Ma),∼D值增加了50-60∼,然后至少在最后∼2 Ma内接近恒定值。虽然这种浓缩趋势与瑞利蒸馏模型相反,但我们认为这与地表抬升对阿拉斯加内陆的间接影响是一致的,包括干旱、水分来源和水分季节性的变化。我们的结论是,δDclay记录记录了阿拉斯加和育空地区内陆地区地形屏障的建立和相关气候变化。
Although the timing of an acceleration in late-Cenozoic exhumation of southern Alaska is reasonably well constrained as beginning ∼5–∼6 Ma, the surface uplift history of this region remains poorly understood. To assess the extent of surface uplift relative to rapid exhumation, we developed a stable isotope record using the hydrogen isotope composition (δD) of paleo-meteoric water over the last ∼7 Ma from interior basins of Alaska and Yukon Territory. Our record, which is derived from authigenic clays (δDclay) in silicic tephras, documents a ∼50–60‰ increase inδD values from the late Miocene (∼6–∼7 Ma) through the Plio-Pleistocene transition (∼2–∼3 Ma), followed by near-constant values over at least the last ∼2 Ma. Although this enrichment trend is opposite that of a Rayleigh distillation model typically associated with surface uplift, we suggest that it is consistent with indirect effects of surface uplift on interior Alaska, including changes in aridity, moisture source, and seasonality of moisture. We conclude that theδDclayrecord documents the creation of a topographic barrier and the associated changes to the climate of interior Alaska and Yukon Territory.
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