دورية أكاديمية
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today
| العنوان: | The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
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| المؤلفون: | Christ, Andrew J., Bierman, Paul R., Knutz, Paul C., Corbett, Lee B., Fosdick, Julie C., Thomas, Elizabeth K., Cowling, Owen C., Hidy, Alan J., Caffee, Marc W. |
| المصدر: | College of Arts and Sciences Faculty Publications |
| بيانات النشر: | UVM ScholarWorks |
| سنة النشر: | 2019 |
| المجموعة: | The University of Vermont: ScholarWorks @ UVM |
| مصطلحات موضوعية: | climate proxies, cosmogenic nuclides, lipid biomarkers, paleoclimate, thermochronology, Climate Solutions, Climate |
| الوصف: | The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. Here, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| العلاقة: | https://scholarworks.uvm.edu/casfac/15Test; https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdfTest |
| DOI: | 10.1029/2019GL085176 |
| الإتاحة: | https://doi.org/10.1029/2019GL085176Test https://scholarworks.uvm.edu/casfac/15Test https://scholarworks.uvm.edu/context/casfac/article/1016/viewcontent/BiermanNorthwestern.pdfTest |
| حقوق: | ©2019. American Geophysical Union. All Rights Reserved. |
| رقم الانضمام: | edsbas.C61017A2 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2019GL085176 |
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