History of ice sheet elevation in East Antarctica: Paleoclimatic implications

Liu, Xiaohan; Huang, Feixiong; Kong, Ping; Fang, Aimin; Li, Xiaoli; Ju, Yitai

doi:10.1016/j.epsl.2009.12.008

Cited by 21 publications

(15 citation statements)

References 37 publications

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“…The soils were weathering stage 3 or 4 (Table 2.6); from this their ages were estimated at 0.5-3.5 Ma. 10 Be exposure ages of samples taken from different elevations on Mount Harding and adjacent Zakharoff Ridge (Liu et al 2010) were consistent with these estimates.…”

Section: Grove Mountainssupporting

confidence: 75%

“…2.10). Unconsolidated Quaternary age sediments include moraines, mostly ice cored, on top or flanks of glaciers and till deposited on mountains and nunataks when glacier levels were higher than at present (Hirvas et al 1993;Hambrey et al 2007;Liu et al 2010). From surface exposure dating, Hambrey et al (2007) recorded at least 10 million years of landscape evolution at Radok Lake in the northern PCM.…”

Section: Geologymentioning

confidence: 97%

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Soils of MacRobertson Land

Мергелов

Konyushkov

Лупачев

et al. 2015

World Soils Book Series

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Section: Grove Mountainssupporting

confidence: 75%

Section: Geologymentioning

confidence: 97%

Soils of MacRobertson Land

Мергелов

Konyushkov

Лупачев

et al. 2015

World Soils Book Series

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“…Assuming initial 3 He/ 4 He of 7 R a (see below) and no radiogenic input of 4 He, and using the mean global sea level high latitude cosmogenic 3 He production rate of 120 atoms g −1 yr −1 (Goehring et al, 2010) and scaling factor of 1.25 for Antarctica (Stone, 2000), the melt R a value of 15 R a shown by the abraded AL/B16-98 fraction would have been produced in ∼100 ka. Outcrop exposure ages of such magnitude within a few hundred meters above the present ice/bedrock contact have been reported from elsewhere in western Dronning Maud Land and East Antarctica (e.g., Liu et al, 2010). Relatively lower melt 3 He/ 4 He values (0-8 R a ) are shown by the boulders and dike sample AL/WM1e-98, all collected very close to the continental ice sheet (Fig.…”

Section: Constraining the Magmatic 3 He/ 4 He Compositionmentioning

confidence: 91%

“…Helium isotopes are a powerful indicator of ancient relatively undegassed mantle sources, having low (Th+U)/He and high 3 He/ 4 He (up to 50 times the atmospheric ratio, i.e., 50 R a ), and often referred to as primitive or primordial (e.g., Lupton and Craig, 1975;Kurz et al, 1982). Although such sources may be considered controversial in the context of whole mantle convection models, most of the models suggest a lower mantle origin (e.g., .…”

Section: Introductionmentioning

confidence: 99%

Low-3He/4He sublithospheric mantle source for the most magnesian magmas of the Karoo large igneous province

Heinonen

Kurz

2015

Earth and Planetary Science Letters

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Keywords:Karoo large igneous province continental flood basalts helium isotopes mantle sourceThe massive outpourings of Karoo and Ferrar continental flood basalts (CFBs) ∼180 Ma ago mark the initial Jurassic rifting stages of the Gondwana supercontinent. The origin and sources of these eruptions have been debated for decades, largely due to difficulties in defining their parental melt and mantle source characteristics. Recent findings of Fe-and Mg-rich dikes (depleted ferropicrite suite) from Vestfjella, western Dronning Maud Land, Antarctica, have shed light on the composition of the deep sub-Gondwanan mantle: these magmas have been connected to upper mantle sources presently sampled by the Southwest Indian Ocean mid-ocean ridge basalts (SWIR MORBs) or to high 3 He/ 4 He plume-entrained non-chondritic primitive mantle sources formed early in Earth's history. In an attempt to determine their He isotopic composition and relative contributions from magmatic, cosmogenic, and radiogenic He sources, we performed in-vacuo stepwise crushing and melting analyses of olivine mineral separates, some of which were abraded to remove the outer layer of the grains. The best estimate for the mantle isotopic composition is given by a sample with the highest amount of He released (>50%) during the first crushing step of an abraded coarse fraction. It has a 3 He/ 4 He of 7.03 ± 0.23 (2σ ) times the atmospheric ratio (R a ), which is indistinguishable from those measured from SWIR MORBs (6.3-7.3 R a ; source 3 He/ 4 He ∼6.4-7.6 R a at 180 Ma) and notably lower than in the most primitive lavas from the North Atlantic Igneous Province (up to 50 R a ), considered to represent the epitome magmas from non-chondritic primitive mantle sources. Previously published trace element and isotopic (Sr, Nd, and Pb) compositions do not suggest a direct genetic link to any modern hotspot of Indian or southern Atlantic Oceans. Although influence of a mantle plume cannot be ruled out, the high magma temperatures and SWIR MORB-like geochemistry of the suite are best explained by supercontinent insulation of a precursory Indian Ocean upper mantle source. Such a model is also supported by the majority of the recent studies on the structure, geochronology, and petrology of the Karoo CFBs.

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“…14) occurred within one composite sequence (< 400 ky). This behavior of ice sheet growth is analogous to the early Cenozoic initiation of the Antarctic ice sheet (Coxall et al, 2005;Liu et al, 2010) suggesting that the stepwise buildup of the Carboniferous ice sheets could record the role of orbitally forced climatic preconditioning across a climate threshold (cf., Palike et al, 2006). The superposition of this series of brief glaciations on the longer-term moderate sea-level rise of the Serpukhovian further suggests instability in the climate system during the late Mississippian icehouse-togreenhouse transition.…”

Section: Paleotropical -High-latitude Linkagesmentioning

confidence: 99%

Sequence stratigraphy and onlap history of the Donets Basin, Ukraine: Insight into Carboniferous icehouse dynamics

Eros

Montañez

Osleger

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

145

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The degree to which Permo-Carboniferous cyclothemic successions archive evidence for longterm variations in ice volume during the Late Paleozoic Ice Age is insufficiently resolved. Here we develop the sequence stratigraphy and onlap-offlap history for a 33-my interval of the Carboniferous using the U-Pb calibrated succession of the Donets Basin, Ukraine, in order to assess the relationship between sea-level, high-latitude changes in glacial extent, and climate. Integrated subsurface and outcrop data permit meter-scale correlation of 242 biostratigraphically constrained limestones and coals, and in turn individual cyclothems, across ~250 km of the Donets Basin. Rapid uniform subsidence and basinwide continuity of marker beds indicate Pennsylvanian deposition under relatively stable tectonic conditions. Three scales of sequences (avg. durations of ~140 ky, ~480 ky and 1.6 my) are recognized on the basis of stratigraphic stacking patterns and basinwide architecture of marine to terrestrial facies assemblages.The hierarchy of sequences and the geographic and stratigraphic positions of shifts in base-level sensitive facies across the Donets ramp permit the construction of an onlap-offlap history at a sub-400 ky scale. Major sea-level lowstands occur across the mid-Carboniferous boundary and during the early Moscovian. These lowstands coincide with glacial maxima inferred from highlatitude glacigenic deposits. The middle to late Pennsylvanian is characterized by a stepwise onlap, culminating in an earliest Gzhelian highstand, suggesting contraction of Carboniferous ice sheets prior to the initiation of Early Permian glaciation.The stratigraphic position of climate sensitive facies within individual Donets cyclothems indicates a turnover from seasonal sub-humid or semi-arid climate to everwet conditions during the late lowstand and maximum ice sheet accumulation. Comparison of the stratigraphic and aerial distribution of coals and evaporites in the Donets Basin with the onlap-offlap history further indicates everwet conditions during lowstands and inferred glacial maxima and drier climate during onlap and inferred ice sheet contraction at the intermediate (~0.8 to 1.6 my) and long (10 6 yr) time-scales. Taken together, the relationship between inferred climate and glacioeustasy suggests a likely teleconnection between high-latitude ice sheet behavior and low-latitude atmospheric dynamics.

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History of ice sheet elevation in East Antarctica: Paleoclimatic implications

Cited by 21 publications

References 37 publications

Soils of MacRobertson Land

Soils of MacRobertson Land

Low-3He/4He sublithospheric mantle source for the most magnesian magmas of the Karoo large igneous province

Sequence stratigraphy and onlap history of the Donets Basin, Ukraine: Insight into Carboniferous icehouse dynamics

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