| DOI: | 10.1016/j.quascirev.2012.11.017
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| Scopus记录号: | 2-s2.0-84871740604
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| 论文题名: | Erosion and transport by Byrd Glacier, Antarctica during the Last Glacial Maximum |
| 作者: | Licht K.J.; Palmer E.F.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2013
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| 卷: | 62 | | 起始页码: | 32
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| 结束页码: | 48
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| 语种: | 英语
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| 英文关键词: | Detrital zircon
; Petrography
; Provenance
; Till
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| Scopus关键词: | Age distribution
; Antarctica
; Archean
; Bedrock outcrop
; Central Basin
; Data sets
; Detrital zircon
; Glacial till
; Glacier till
; Ice flow
; Last Glacial Maximum
; Provenance
; Rock types
; Ross Sea
; Sand fraction
; Spatial variability
; Subglacial process
; Till
; Triassic
; Cluster analysis
; Geochronology
; Glacial geology
; Grinding (comminution)
; Particle size analysis
; Petrography
; Zircon
; Ice
; Archean
; bedrock
; cluster analysis
; detrital deposit
; geochronology
; glacial erosion
; Holocene
; ice flow
; Last Glacial Maximum
; lithic fragment
; moraine
; nunatak
; outcrop
; particle size
; petrography
; provenance
; reconstruction
; till
; Triassic
; uranium isotope
; uranium-lead dating
; Antarctica
; Byrd Glacier
; East Antarctica
; Ross Sea
; Southern Ocean
; Transantarctic Mountains
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| 英文摘要: | Glacial till samples from seven, modern-Holocene Byrd Glacier moraines were characterized using particle size analysis, sand petrography and detrital zircon geochronology and compared to Ross Sea tills deposited during the Last Glacial Maximum. The goal was to identify the paleoflow path for Byrd Glacier and assess the use of multiple provenance techniques. The coarse sand fraction of Byrd Glacier tills is dominated by lithic fragments of adjacent bedrock outcrops, except samples from the Lonewolf Nunataks, which have a higher proportion of mineral to lithic fragments, as well as a recognizable exotic component. Cluster analysis shows that Byrd Glacier tills, with the exception of the two Lonewolf Nunataks sites, do not cluster strongly with Ross Sea samples because they have a higher proportion of lithic fragments. This indicates that comminution must be an active subglacial process beneath East Antarctic outlet glaciers. Byrd Glacier tills are also typically coarser grained that Ross Sea tills and their maturity is a reflection of both glacial processes and rock type. Measured U/Pb ages of detrital zircons from Byrd Glacier tills range from Triassic to Archean (240-3540 Ma) with a dominance of grains 530-600 Ma. Ross Sea till samples show spatial variability in U/Pb age distributions, with the core sites west of the 180° longitude line showing similarity to most Byrd Glacier tills, whereas core NBP9407-39, east of 180° long., is dominated by ~100 Ma grains. Ross Sea tills also contain a recognizable detrital zircon fraction eroded inland of the Transantarctic Mountains. Both provenance methods indicate that the ice flow line for Byrd Glacier during the LGM was to the east of Ross Island and extended on either side of Ross Bank, with the majority of ice flowing to the Ross Sea's Central Basin. Our analysis shows that sand petrography and detrital zircon U/Pb age spectra provide complementary datasets that produce similar ice flow reconstructions and reveal valuable information about glacial processes and ice covered bedrock. © 2012 Elsevier Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/60716
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Department of Earth Sciences, Indiana University-Purdue University, Indianapolis, United States
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| Recommended Citation: | |
Licht K.J.,Palmer E.F.. Erosion and transport by Byrd Glacier, Antarctica during the Last Glacial Maximum[J]. Quaternary Science Reviews,2013-01-01,62
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