DOI: 10.1016/j.quascirev.2018.08.027
Scopus记录号: 2-s2.0-85054159918
论文题名: History and dynamics of the Greater Yellowstone Glacial System during the last two glaciations
作者: Licciardi J.M. ; Pierce K.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 200 起始页码: 1
结束页码: 33
语种: 英语
英文关键词: Bull Lake
; Cosmogenic isotopes
; Geomorphology
; Glacial
; Glaciation
; North America
; Orographic precipitation
; Paleoclimatology
; Pinedale
; Pleistocene
; Teton Range
; Yellowstone
Scopus关键词: Geochronology
; Geomorphology
; Ice
; Isotopes
; Lakes
; Snow
; Unloading
; Cosmogenic isotopes
; Glacial
; Glaciation
; North America
; Orographic precipitation
; Paleoclimatology
; Pinedale
; Pleistocene
; Teton Range
; Yellowstones
; Glacial geology
英文摘要: The Greater Yellowstone Glacial System (GYGS) covered about 20,000 km2 at its maximum Pleistocene extent. The initiation, culmination, and ultimate decay of the GYGS involved complex interactions between several coalescent ice masses flowing from glacial source areas adjoining and including the Yellowstone Plateau. Here, we present an updated review of the history and dynamics of the GYGS during the penultimate (Bull Lake) and last (Pinedale) glaciations, drawing upon an integration of glacial-geologic mapping with >130 cosmogenic 10Be and 3He exposure ages. Bull Lake glacial deposits in greater Yellowstone are dated to ca. 150–140 ka and correlate with marine isotope stage 6. The Bull Lake glaciation extended well beyond the Pinedale along the southern and western GYGS margins, but Pinedale glaciers overrode Bull Lake ice limits on the north and east sides. The northeastward shift of the center of ice mass from Bull Lake to Pinedale time may be explained by uplift on the leading edge of the Yellowstone hotspot and subsidence on the trailing margin. In early Pinedale time (∼22–18 ka), ice buildup culminated in the high terrain of the Beartooth Uplift and High Absaroka Range. Glaciers from these source regions flowed onto the northeastern margin of the Yellowstone Plateau and advanced to terminal moraines beyond Clarks Fork Canyon and in Jackson Hole. By middle Pinedale time (∼18–16 ka), the Yellowstone Plateau ice cap surface had risen above the equilibrium-line altitude, stimulating orographic glacial buildup nourished by storms funneled eastward through the Snake River Plain. The plateau ice cap eventually thickened to >1000 m and joined glaciers from the Beartooth Uplift and Gallatin Range to form the northern Yellowstone outlet glacier. Terrain east and downwind of the ice cap crest was placed in a precipitation shadow, resulting in glacial recession in these regions. During the late Pinedale (∼16–13 ka), the plateau ice cap prograded southwestward toward the direction of moisture supply, leading to advances along the southern and western margins of the GYGS. Northern sectors of the plateau ice cap were nearly stagnant at this time. The Yellowstone region experienced widespread deglaciation ca. 15–14 ka in response to warming climate. Unloading of the ∼1 km-thick plateau ice cap and consequent release of pressure on the magmatic system beneath Yellowstone was not accompanied by volcanism, indicating that the magma chamber was not primed to erupt via decompression during the last deglaciation. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112013
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth Sciences, University of New Hampshire, 56 College Road, Durham, NH 03824, United States; U.S. Geological Survey, NRMSC, 2327 University Way, Box 2, Bozeman, MT 59715, United States
Recommended Citation:
Licciardi J.M.,Pierce K.L.. History and dynamics of the Greater Yellowstone Glacial System during the last two glaciations[J]. Quaternary Science Reviews,2018-01-01,200