| DOI: | 10.1016/j.palaeo.2016.01.026
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| 论文题名: | Paleoclimate of Antarctica reconstructed from clast weathering rind analysis |
| 作者: | Mahaney W.C.; Schwartz S.
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| 刊名: | Palaeogeography, Palaeoclimatology, Palaeoecology
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| ISSN: | 0031-0182
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| 出版年: | 2016
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| 卷: | 446 | | 起始页码: | 205
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| 结束页码: | 212
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| 语种: | 英语
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| 英文关键词: | Antarctic paleosols
; Antarctic temperate/polar ice transition
; XRF/SEM/EDS sediment analysis
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| 英文摘要: | Previous analysis of extractable Fe/Al in paleosols near New Mountain, Antarctica, suggests a pre-Middle Miocene, possibly Late Oligocene-Early Miocene age for paleosol 831 emplaced during the alpine event prior to the growth of the Inland Ice Sheet. Recent analysis of weathering zones in clasts with encrusted Fe/salts from the pebble pavement overlying the 831 paleosol reveals a succession of three weathering zones in a sandstone clast that record a paleoclimate transitioning from warm/wet (temperate) to cold/dry (polar). The first zone corresponds to an association of quartz cemented with berthierine (smectite-serpentine) and illite clay minerals. The second zone transitional from weathered clast to Na-encrusted rind contains smaller amounts of berthierine and illite formed in grains of partially dissolved quartz with minor salt content. Zone three corresponds to an ~3 mm (3×106nm) thick mass of porous nitrate and gypsum. The contact between zones 2 and 3 appears to be correlative with the transition from temperate to polar ice which is considered to have occurred prior to or coincident with the Middle Miocene Climatic Optimum. © 2016 Elsevier B.V. |
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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/68558
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Quaternary Surveys, 26 Thornhill Ave., Thornhill, ON, Canada; Université Grenoble Alpes, ISTerre-UMR 5275, Grenoble, France
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| Recommended Citation: | |
Mahaney W.C.,Schwartz S.. Paleoclimate of Antarctica reconstructed from clast weathering rind analysis[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,446
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