Depositional environment and climate changes during the Holocene in Grande Valley, Fildes Peninsula, King George Island, Antarctica

AbstractA 9.24 m sediment core, GA-2, was collected on the coastal platform of Grande Valley, a relatively narrow and shallow fjord in Fildes Peninsula, King George Island, Antarctica. The sediment was formed between 6600 and 2000 cal. yr bp according to accelerator mass spectrometry (AMS) 14C dating of five bulk sediment samples. The comprehensive proxy indicators (grain size, loss on ignition at 550°C, magnetic susceptibility, elements) were analysed, and three separate depositional environments and an alternating climate change pattern were identified. Grande Valley experienced a warm marine environment between 6600 and 5800 cal. yr bp, a minor cooling between 5800 and 4800 cal. yr bp, the transition from cool to warm during 4800–4400 cal. yr bp, a mid-Holocene climatic optimum between 4400 and 2700 cal. yr bp, and the onset of the Neoglacial at 2700 cal. yr bp. This study reconstructed the environmental history of Grande Valley during the mid–late Holocene, provides the missing marine record of historical climate for the western coast of Fildes Peninsula and lays the foundation for further study of the climate and environment changes therein. Our finding that the sea level was c. 12 m a.m.s.l. at 2000 cal. yr bp allows for detailed reconstruction of Holocene sea level variations.

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Upper Maastrichtian depositional environments and sea-level history of the Kopet-Dagh Intracontinental Basin, Kalat Formation, NE Iran

Facies ◽

10.1007/s10347-005-0034-0 ◽

2006 ◽

Vol 52 (2) ◽

pp. 237-248 ◽

Cited By ~ 7

Author(s):

Asadollah Mahboubi ◽

Reza Moussavi-Harami ◽

Parviz Mansouri-Daneshvar ◽

Mehdi Nadjafi ◽

Robert L. Brenner

Keyword(s):

Sea Level ◽

Depositional Environments ◽

History Of ◽

Kopet Dagh ◽

Upper Maastrichtian ◽

Ne Iran ◽

And Sea Level

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Younger Dryas to mid-Holocene environmental history of the lowlands of NW Transylvania, Romania

Quaternary Research ◽

10.1016/j.yqres.2007.08.003 ◽

2007 ◽

Vol 68 (3) ◽

pp. 364-378 ◽

Cited By ~ 47

Author(s):

Angelica Feurdean ◽

Volker Mosbrugger ◽

Bogdan P. Onac ◽

Victor Polyak ◽

Daniel Veres

Keyword(s):

Environmental History ◽

Environmental Changes ◽

Younger Dryas ◽

Total Carbon ◽

Small Populations ◽

Minor Constituent ◽

Effective Moisture ◽

Competition Effects ◽

History Of ◽

A Minor

AbstractPollen, micro-charcoal and total carbon analyses on sediments from the Turbuta palaeolake, in the Transylvanian Basin of NW Romania, reveal Younger Dryas to mid-Holocene environmental changes. The chronostratigraphy relies on AMS 14C measurements on organic matter and U/Th TIMS datings of snail shells. Results indicate the presence of Pinus and Betula open woodlands with small populations of Picea, Ulmus, Alnus and Salix before 12,000 cal yr BP. A fairly abrupt replacement of Pinus and Betula by Ulmus-dominated woodlands at ca. 11,900 cal. yr BP likely represents competition effects of vegetation driven by climate warming at the onset of the Holocene. By 11,000 cal yr BP, the woodlands were increasingly diverse and dense with the expansion of Quercus, Fraxinus and Tilia, the establishment of Corylus and the decline of upland herbaceous and shrubs taxa. The marked expansion of Quercus accompanied by Tilia between 10,500 and 8000 cal yr BP could be the result of low effective moisture associated with both low elevation of the site and with regional change towards a drier climate. At 10,000 cal yr BP, Corylus spread across the region, and by 8000 cal yr BP it replaced Quercus as a dominant forest constituent, with only little representation of Picea abies. Carpinus became established around 5500 cal yr BP, but it was only a minor constituent in local woodlands until ca. 5000 cal yr BP. Results from this study also indicate that the woodlands in the lowlands of Turbuta were never closed.

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Postglacial relative sea level change at Fildes Peninsula, King George Island (West Antarctic)

Journal Ice and Snow ◽

10.15356/2076-6734-2016-1-93-102 ◽

2016 ◽

Vol 56 (1) ◽

pp. 93-102

Author(s):

K. V. Polishchuk ◽

S. R. Verkulich ◽

I. S. Ezhikov ◽

Z. V. Pushina

Keyword(s):

Sea Level ◽

Sea Level Change ◽

King George Island ◽

Relative Sea Level ◽

Fildes Peninsula ◽

Level Change ◽

West Antarctic

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Depositional environment of the Branch Sandstone and correlative sequences: Late Cretaceous changes in relative sea level in the East Coast Basin of New Zealand

10.26686/wgtn.17134055 ◽

2021 ◽

Author(s):

◽

Lisa McCarthy

Keyword(s):

Sea Level ◽

East Coast ◽

Depositional Environments ◽

Passive Margin ◽

Sea Level Changes ◽

Relative Sea Level ◽

Sea Level Fluctuations ◽

The North ◽

Tasman Sea ◽

History Of

The Branch Sandstone is located within an overall transgressive, marine sedimentary succession in Marlborough, on the East Coast of New Zealand’s South Island. It has previously been interpreted as an anomalous sedimentary unit that was inferred to indicate abrupt and dramatic shallowing. The development of a presumed short-lived regressive deposit was thought to reflect a change in relative sea level, which had significant implications for the geological history of the Marlborough region, and regionally for the East Coast Basin. The distribution and lithology of Branch Sandstone is described in detail from outcrop studies at Branch Stream, and through the compilation of existing regional data. Two approximately correlative sections from the East Coast of the North Island (Tangaruhe Stream and Angora Stream) are also examined to provide regional context. Depositional environments were interpreted using sedimentology and palynology, and age control was developed from dinoflagellate biostratigraphy. Data derived from these methods were combined with the work of previous authors to establish depositional models for each section which were then interpreted in the context of relative sea level fluctuations. At Branch Stream, Branch Sandstone is interpreted as a shelfal marine sandstone, that disconformably overlies Herring Formation. The Branch Sandstone is interpreted as a more distal deposit than uppermost Herring Formation, whilst the disconformity is suggested to have developed during a fall in relative sea level. At Branch Stream, higher frequency tectonic or eustatic sea-level changes can therefore be distinguished within a passive margin sedimentary sequence, where sedimentation broadly reflects subsidence following rifting of the Tasman Sea. Development of a long-lived disconformity at Tangaruhe Stream and deposition of sediment gravity flow deposits at Angora Stream occurred at similar times to the fall in relative sea level documented at the top of the Herring Formation at Branch Stream. These features may reflect a basin-wide relative sea-level event, that coincides with global records of eustatic sea level fall.

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Late Pleistocene and Holocene melting history of the Antarctic ice sheet derived from sea-level variations

Marine Geology ◽

10.1016/s0025-3227(00)00018-9 ◽

2000 ◽

Vol 167 (1-2) ◽

pp. 85-103 ◽

Cited By ~ 83

Author(s):

M. Nakada ◽

R. Kimura ◽

J. Okuno ◽

K. Moriwaki ◽

H. Miura ◽

...

Keyword(s):

Sea Level ◽

Late Pleistocene ◽

Ice Sheet ◽

Antarctic Ice Sheet ◽

History Of ◽

Sea Level Variations ◽

The Antarctic

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Environmental History of the Rhine-Meuse Delta: An Ecological Story on Evolving Human-Environmental Relations Coping with Climate Change and Sea Level Rise. By Piet H. Nienhuis. New York: Springer, 2008. xviii + 640 pp. Index, maps, and illustrations. Cloth $239.00

Environmental History ◽

10.1093/envhis/14.3.587 ◽

2009 ◽

Vol 14 (3) ◽

pp. 587-588

Author(s):

J. R. McNeill

Keyword(s):

Climate Change ◽

New York ◽

Sea Level Rise ◽

Environmental History ◽

Sea Level ◽

History Of ◽

Environmental Relations ◽

Index Maps ◽

And Sea Level

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Geophysical evidence for a large Holocene ice marginal moraine of Skeiðarárjökull, SE Iceland

10.5194/egusphere-egu2020-9886 ◽

2020 ◽

Author(s):

Devin Harrison ◽

Neil Ross ◽

Andrew Russell ◽

Stuart Jones

Keyword(s):

Surface Morphology ◽

Environmental History ◽

Sea Level ◽

Low Frequency ◽

Ice Age ◽

The Holocene ◽

Geophysical Surveys ◽

History Of ◽

Ground Penetrating ◽

Surface Geomorphology

The sedimentary record of Icelandic ice-contact environments provides valuable information about glacier margin dynamics and position, relative sea-level and the geomorphic processes driving proglacial environments. This important archive has been little exploited, however, with most glacier and sea level reconstructions based on limited sedimentary exposures and surface geomorphic evidence. Although geophysical surveys of Icelandic sandur have been conducted, they have often been of limited spatial scale and focused on specific landforms. Here, we report an extensive (42 km of data) detailed low-frequency (40 and 100 MHz) ground-penetrating radar (GPR) survey of the Sandgig&#250;r moraine complex, SE Iceland, which transforms our understanding of this landform, with implications for the Holocene history of Skei&#240;ar&#225;rsandur and SE Iceland.The Sandgig&#250;r moraines are located on Skei&#240;ar&#225;rsandur, SE Iceland, down-sandur of large Little Ice Age-moraines of Skei&#240;ar&#225;rj&#246;kull. They have a relatively subtle surface geomorphic expression (typically 125 m wide and 7 m high), and knowledge of their formation is limited, with no dating control on their age or detailed geomorphic or sedimentological investigations. &#160;GPR investigations reveal a much larger (60 m high and 1200 m wide) and extensive buried moraine complex than that suggested by surface morphology, suggesting that the moraine was a major Holocene ice margin of Skei&#240;ar&#225;rj&#246;kull.GPR reflections interpreted as large progradational foresets (up to 20 m in height) beneath the morainic structure are consistent with a sub-aqueous depositional environment before moraine formation, providing potential controls on former sea-level. &#160;The GPR data also provide information on the internal structure of the moraine, with evidence for glacitectonism within the proximal side of the moraine, multiphase moraine formation, and possible buried ice at depth. A 30-40 m thick package of down-sandur dipping GPR reflections drape the leeside of the moraine, evidencing glaciofluvial deposition during and after moraine development. Potential moraine breaches, possibly caused by glaciofluvial (e.g. j&#246;kulhlaup) events, are also apparent within the GPR data and the surface geomorphology.We combine GPR-derived subsurface architecture with the current surface morphology to develop a conceptual model detailing the geomorphic evolution of the moraines and surrounding region, from pre-moraine morphology, to their formation and breaching, resulting in the subsequent present-day morphology. These results provide new insights into the Holocene to present-day evolution of Skei&#240;ar&#225;rsandur and Skei&#240;ar&#225;rj&#246;kull, with implications for reconstructions of the Holocene environmental history of SE Iceland.

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Carbon isotope chemostratigraphy and sea-level history of the Hirnantian Stage (uppermost Ordovician) in the Oslo–Asker district, Norway

Geological Magazine ◽

10.1017/s0016756821000546 ◽

2021 ◽

pp. 1-32

Author(s):

Mikael Calner ◽

Johan Fredrik Bockelie ◽

Christian M.Ø. Rasmussen ◽

Hanna Calner ◽

Oliver Lehnert ◽

...

Keyword(s):

Sea Level ◽

Fourth Order ◽

Sedimentary Facies ◽

Late Ordovician ◽

Depositional Environments ◽

Temporal Development ◽

First Occurrence ◽

History Of ◽

Southern Norway ◽

Mixed Carbonate

Abstract We present a δ13Ccarb chemostratigraphy for the Late Ordovician Hirnantian Stage based on 208 whole-rock samples from six outcrops in the Oslo–Asker district, southern Norway. Our data include the Norwegian type section for the Hirnantian Stage and Ordovician–Silurian boundary at Hovedøya Island. The most complete record of the Hirnantian Isotope Carbon Excursion (HICE) is identified in a coastal exposure at Konglungø locality where the preserved part of the anomaly spans a c. 24 m thick, mixed carbonate–siliciclastic succession belonging to the upper Husbergøya, Langåra and Langøyene formations and where δ13Ccarb peak values reach c. +6 ‰. Almost the entire HICE occurs above beds containing the Hirnantia Fauna, suggesting a latest Hirnantian age for the peak of the excursion. The temporal development of the HICE in southern Norway is associated with substantial shallowing of depositional environments. Sedimentary facies and erosional unconformities suggest four inferably fourth-order glacio-eustatically controlled sea-level lowstands with successively increased exposure and erosion to the succession. The youngest erosional unconformity is related to the development of incised valleys and resulted in cut-out of at least the falling limb of the HICE throughout most of the Oslo–Asker district. The fill of the valleys contains the falling limb of the HICE, and the postglacial transgression therefore can be assigned to the latest part of the Hirnantian Age. We address the recent findings of the chitinozoan Belonechitina gamachiana in the study area and its relationship to the first occurrence of Hirnantia Fauna in the studied sections, challenging identification of the base of the Hirnantian Stage.

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Late Holocene Sedimentation on the Southern Kāpiti Coast

10.26686/wgtn.17064614.v1 ◽

2021 ◽

Author(s):

◽

Rackley Michael Nolan

Keyword(s):

Sea Level ◽

Coastal Plain ◽

Depositional Environments ◽

Hazard Identification ◽

Coastal Hazards ◽

Western Coast ◽

Base Level ◽

Lack Of Information ◽

Terrestrial Environments ◽

Vertical Base

The Kāpiti Coast is a broad low lying coastal plain on the western coast of New Zealand’s North Island. The coastal plain has formed over the last 6500 years through rapid progradation of coastal sediment, developing a distinct cuspate foreland. With numerous coastal communities across the low coastal plain, recent coastal erosion of the southern coastal plain combined with forecast sea level rise has drawn attention to coastal hazards. However, understanding these hazards has been hampered by a lack of information on the Holocene tectonic and sedimentary development of the coastal plain. This study focuses on the southern portion of the Kāpiti Coast using a geological approach to document coastal outcrops and drillcores. Using detailed sedimentological analysis including description, grainsize, composition and shape, in addition to observation of the modern environment, a detailed facies scheme and depositional model for the southern Kāpiti Coast are produced. Combining the interpreted depositional environments and age control provided by C14, OSL and well-dated pumice deposition, progressive coastal progradation and a transition from marine to terrestrial environments is reconstructed for the southern Kāpiti Coast. Records from this study reveal rapid sedimentation, at rates of up to 12.6m/1000 years within this southern limb, slowing dramatically with coastal retreat beginning within the last 400 years. Recognising the vertical offset of the beach/dune boundary as a marker of past sea level recorded in the cores and outcrops, a 1m uplift is recognised at the southernmost point of the coastal plain. In addition to constraining the penultimate movement of the Ohariu Fault, it contrasts with the tectonic stability of the central part of the coastal plain and subsidence further north. Such insight into vertical base level change across the coastal plain has implications for future coastal hazard identification.

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