干旱区生态环境知识资源中心(Arid): Cryostratigraphy of mid-Miocene permafrost at Friis Hills, McMurdo Dry Valleys of Antarctica

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DOI	10.1017/S0954102020000619
	Cryostratigraphy of mid-Miocene permafrost at Friis Hills, McMurdo Dry Valleys of Antarctica
	Verret, Marjolaine; Dickinson, Warren; Lacelle, Denis; Fisher, David; Norton, Kevin; Chorley, Hannah; Levy, Richard; Naish, Tim
通讯作者	Verret, M (corresponding author), Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand.
来源期刊	ANTARCTIC SCIENCE
ISSN	0954-1020
EISSN	1365-2079
出版年	2021
卷号	33 期号:2 页码:174-188
英文摘要	The origin and stability of ground ice in the stable uplands of the McMurdo Dry Valleys remains poorly understood, with most studies focusing on the near-surface permafrost. The 2016 Friis Hills Drilling Project retrieved five cores reaching 50 m depth in mid-Miocene permafrost, a period when Antarctica transitioned to a hyper-arid environment. This study characterizes the cryostratigraphy of arguably the oldest permafrost on Earth and assesses 15 Myr of ground ice evolution using the REGO model. Four cryostratigraphic units were identified: 1) surficial dry permafrost (0-30 cm), 2) ice-rich to ice-poor permafrost (0.3-5.0 m) with high solute load and delta O-18 values (-16.2 +/- 1.8 parts per thousand) and low D-excess values (-65.6 +/- 4.3 parts per thousand), 3) near-dry permafrost (5-20 m) and 4) ice-poor to ice-rich permafrost (20-50 m) containing ice lenses with low solute load and delta O-18 values (-34.6 +/- 1.2 parts per thousand) and D-excess of 6.9 +/- 2.6 parts per thousand. The near-surface delta O-18 profile of ground ice is comparable to other sites in the stable uplands, suggesting that this ice is actively responding to changing surface environmental conditions and challenging the assumption that the surface has remained frozen for 13.8 Myr. The deep ice lenses probably originate from the freezing of meteoric water during the mid-Miocene, and their delta O-18 composition suggests mean annual air temperatures similar to 7-11 degrees C warmer than today.
英文关键词	ground ice Miocene Climatic Optimum soluble ions stable upland zone stable water isotopes
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000648921000006
WOS类目	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367847
作者单位	[Verret, Marjolaine; Dickinson, Warren; Chorley, Hannah; Levy, Richard; Naish, Tim] Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand; [Lacelle, Denis] Univ Ottawa, Dept Geog Environm & Geomat, Ottawa, ON, Canada; [Fisher, David] Univ Ottawa, Dept Earth Sci, Ottawa, ON, Canada; [Norton, Kevin] Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand; [Levy, Richard] GNS Sci, Lower Hutt, New Zealand
推荐引用方式 GB/T 7714	Verret, Marjolaine,Dickinson, Warren,Lacelle, Denis,et al. Cryostratigraphy of mid-Miocene permafrost at Friis Hills, McMurdo Dry Valleys of Antarctica[J],2021,33(2):174-188.
APA	Verret, Marjolaine.,Dickinson, Warren.,Lacelle, Denis.,Fisher, David.,Norton, Kevin.,...&Naish, Tim.(2021).Cryostratigraphy of mid-Miocene permafrost at Friis Hills, McMurdo Dry Valleys of Antarctica.ANTARCTIC SCIENCE,33(2),174-188.
MLA	Verret, Marjolaine,et al."Cryostratigraphy of mid-Miocene permafrost at Friis Hills, McMurdo Dry Valleys of Antarctica".ANTARCTIC SCIENCE 33.2(2021):174-188.