دورية أكاديمية
The Mississippi River records glacial-isostatic deformation of North America.
| العنوان: | The Mississippi River records glacial-isostatic deformation of North America. |
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| المؤلفون: | Wickert AD; Department of Earth Sciences and Saint Anthony Falls Laboratory, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA., Anderson RS; Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, 4001 Discovery Dr., Boulder, CO 80303, USA., Mitrovica JX; Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138, USA., Naylor S; Center for Geospatial Data Analysis and Indiana Geological Survey, Indiana University, 611 N. Walnut Grove St., Bloomington, IN 47405, USA., Carson EC; Wisconsin Geological and Natural History Survey, 3817 Mineral Point Rd., Madison, WI 53705, USA. |
| المصدر: | Science advances [Sci Adv] 2019 Jan 30; Vol. 5 (1), pp. eaav2366. Date of Electronic Publication: 2019 Jan 30 (Print Publication: 2019). |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Association for the Advancement of Science Country of Publication: United States NLM ID: 101653440 Publication Model: eCollection Cited Medium: Internet ISSN: 2375-2548 (Electronic) Linking ISSN: 23752548 NLM ISO Abbreviation: Sci Adv Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: | Original Publication: Washington, DC : American Association for the Advancement of Science, [2015]- |
| مستخلص: | The imprint of glacial isostatic adjustment has long been recognized in shoreline elevations of oceans and proglacial lakes, but to date, its signature has not been identified in river long profiles. Here, we reveal that the buried bedrock valley floor of the upper Mississippi River exhibits a 110-m-deep, 300-km-long overdeepening that we interpret to be a partial cast of the Laurentide Ice Sheet forebulge, the ring of flexurally raised lithosphere surrounding the ice sheet. Incision through this forebulge occurred during a single glacial cycle at some time between 2.5 and 0.8 million years before present, when ice-sheet advance forced former St. Lawrence River tributaries in Minnesota and Wisconsin to flow southward. This integrated for the first time the modern Mississippi River, permanently changing continental-scale hydrology and carving a bedrock valley through the migrating forebulge with sediment-poor water. The shape of the inferred forebulge is consistent with an ice sheet ~1 km thick near its margins, similar to the Laurentide Ice Sheet at the Last Glacial Maximum, and provides evidence of the impact of geodynamic processes on geomorphology even in the midst of a stable craton. |
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| تواريخ الأحداث: | Date Created: 20190208 Latest Revision: 20200225 |
| رمز التحديث: | 20231215 |
| مُعرف محوري في PubMed: | PMC6353627 |
| DOI: | 10.1126/sciadv.aav2366 |
| PMID: | 30729164 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 2375-2548 |
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| DOI: | 10.1126/sciadv.aav2366 |