globalchange  > 气候减缓与适应
DOI: 10.1130/G45335.1
WOS记录号: WOS:000456424300004
论文题名:
Was the Laurentide Ice Sheet significantly reduced during Marine Isotope Stage 3?
作者: Dalton, April S.1,2; Finkelstein, Sarah A.1; Forman, Steven L.3; Barnett, Peter J.4; Pico, Tamara5; Mitrovica, Jerry X.5
通讯作者: Dalton, April S.
刊名: GEOLOGY
ISSN: 0091-7613
EISSN: 1943-2682
出版年: 2019
卷: 47, 期:2, 页码:111-114
语种: 英语
WOS关键词: HUDSON-BAY LOWLANDS ; GLACIAL CYCLE ; CLIMATE ; DEPOSITION ; MISSOURI ; BUILDUP ; HISTORY ; RECORDS ; CANADA
WOS学科分类: Geology
WOS研究方向: Geology
英文摘要:

Accurately reconstructing the paleogeography of the Laurentide Ice Sheet (LIS) during Marine Isotope Stage 3 (MIS 3; ca. 57,000 to ca. 29,000 yr B.P.) is critical for understanding glacial growth toward the Last Glacial Maximum (LGM), refining sea-level histories, and studying the Earth system response to rapid climate change events. Here, we present a geo-chronological data set useful for testing hypotheses of global sea level and refining ice sheet configuration through this interval. Data (n = 735) span the entire MIS 3 interval and consist of C-14 determinations (n = 651), cosmogenic exposure ages (n = 52), and optically stimulated luminescence dates (n = 32). On that basis, we hypothesize that the central region of the LIS underwent a dramatic reduction in ice from ca. 52 to 40 ka. Key to this hypothesis are geological records at sites in the Hudson Bay Lowlands (east central Canada) that suggest a marine incursion and development of terrestrial landscapes. We show that these landscapes are consistent with recently published glacial isostatic adjustment predictions that include widespread deglaciation of the eastern (Labrador) sector of the LIS with ice buildup over the western (Keewatin) sector at 42 ka. Ice growth from this minimum toward the LGM is likely to have been rapid. The agreement between this data set and modeling predictions prompts the reassessment of key Late Pleistocene records, including Heinrich events, loess deposition in the continental United States, and sedimentological records from the Gulf of Mexico.


Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/128412
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: 1.Univ Toronto, Dept Earth Sci, Toronto, ON M5S 3B1, Canada
2.Univ Durham, Dept Geog, Durham DH1 3LE, England
3.Baylor Univ, Dept Geosci, Waco, TX 76798 USA
4.Laurentian Univ, Harquail Sch Earth Sci, Sudbury, ON P3E 2C6, Canada
5.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA

Recommended Citation:
Dalton, April S.,Finkelstein, Sarah A.,Forman, Steven L.,et al. Was the Laurentide Ice Sheet significantly reduced during Marine Isotope Stage 3?[J]. GEOLOGY,2019-01-01,47(2):111-114
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Dalton, April S.]'s Articles
[Finkelstein, Sarah A.]'s Articles
[Forman, Steven L.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Dalton, April S.]'s Articles
[Finkelstein, Sarah A.]'s Articles
[Forman, Steven L.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Dalton, April S.]‘s Articles
[Finkelstein, Sarah A.]‘s Articles
[Forman, Steven L.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.