کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8907256 | 1634674 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A stable isotope record of late Cenozoic surface uplift of southern Alaska
ترجمه فارسی عنوان
یک ضبط ایزوتوپ پایدار از بالا رفتن سطح کانوزوئیک در جنوب آلاسکا
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کلمات کلیدی
آلاسکا، بالا بردن سطح، ایزوتوپهای پایدار، تغییر محیط زیست، چرخه هیدرولوژیکی، پائولاتومتری،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Although the timing of an acceleration in late-Cenozoic exhumation of southern Alaska is reasonably well constrained as beginning â¼5-â¼6 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 â¼7 Ma from interior basins of Alaska and Yukon Territory. Our record, which is derived from authigenic clays (δDclay) in silicic tephras, documents a â¼50-60â° increase in δD values from the late Miocene (â¼6-â¼7 Ma) through the Plio-Pleistocene transition (â¼2-â¼3 Ma), followed by near-constant values over at least the last â¼2 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 the δDclay record documents the creation of a topographic barrier and the associated changes to the climate of interior Alaska and Yukon Territory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 482, 15 January 2018, Pages 300-311
Journal: Earth and Planetary Science Letters - Volume 482, 15 January 2018, Pages 300-311
نویسندگان
Nicholas S. Bill, Hari T. Mix, Peter U. Clark, Sean P. Reilly, Britta J.L. Jensen, Jeffrey A. Benowitz,