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2017
In order to understand the growth and retreat of glaciers in response to the glacial-interglacial changes, subglacial marine sedimentary sequences have been studied extensively in the continental shelf areas of the Ross Sea. The purpose is to comprehend the glaciomarine sedimentation change on the continental slope of eastern Pennell-Iselin Bank in the Ross Sea, using three gravity cores (C1, C2, C3) and three box cores (BC1, BC2, BC3) collected from sites (RS14-1, 2, 3), respectively, across the continental slope to the eastern side of the Pennell-Iselin Bank during XXIX° (2014) PNRA expedition (Rosslope Ⅱ project). Several sedimentological (grain size, magnetic susceptibility), elemental (XRF), geochemical (biogenic opal, total organic carbon, total nitrogen, C/N ratios, CaCO3), and isotopic (δ13C and δ15N of organic matter) parameters were measured along sediment cores with AMS 14C dating of bulk sediments. Core-sediments consist mostly of hemipelagic sandy clay or silty clay wit...
Palaeogeography, Palaeoclimatology, Palaeoecology
Late Quaternary glacial marine to marine sedimentation in the Pennell Trough (Ross Sea, Antarctica)2006 •
Annals of Glaciology
Late Pleistocene-Holocene sedimentary fluxes of organic carbon and biogenic silica in the northwestern Ross Sea, Antarctica1998 •
Eight sediment gravity cores, collected from the joides and Drygalski basins, were analysed in order to understand late Pleistocene-Holocene biogenic flux changes in the Ross Sea, driven by paleoenvironmental changes. Core lithologies and magnetic-susceptibility depth profiles were used for core logging and stratigraphic correlation. Nineteen AMS radiocarbon dates of bulk organic matter were used to set chronological constraints and calculate sediment accumulation rates. These rates, which vary from 1.4-38 cm ka−1. were used to obtain the burial fluxes of biogenic components. The highest fluxes occur in the deepest parts of the basins (TOC, 0.05-0.2 g cm−2ka−1; biogenic silica, 1.5-5 g cm−1ka−1), where as topographic highs show the lowest values (TOC, 0.01-0.1 g cm−2ka−1; biogenic silica, 0.1-1.4 g cm−2ka−1). Dramatic changes in both physical properties and fluxes record the establishment of open marine-sedimentation conditions which occurred first in the joides basin and then, with...
deepseadrilling.org
22. Textural Characteristics of Cenozoic Preglacial and Glacial Sediments at Site 270, Ross Sea, AntarcticaDeep Sea Research Part II: Topical Studies in Oceanography
Late Pleistocene and Holocene sedimentation on the George V Continental Shelf, East Antarctica2003 •
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2021 •
The repeated proximity of West Antarctic Ice Sheet (WAIS) ice to the eastern Ross Sea continental shelf break during past ice age cycles has been inferred to directly influence sedimentary processes occurring on the continental slope, such as turbidity current and debris flow activity; thus, the records of these processes can be used to study the past history of the WAIS. Ross Sea slope sediments may additionally provide an archive on the history and interplay of density-driven or geostrophic oceanic bottom currents with ice-sheet-driven depositional mechanisms. We investigate the upper 121 m of Hole U1525A, collected during International Ocean Discovery Program (IODP) Expedition 374 in 2018. Hole U1525A is located on the southwestern external levee of the Hillary Canyon (Ross Sea, Antarctica) and the depositional lobe of the nearby trough-mouth fan. Using core descriptions, grain size analysis, and physical properties datasets, we develop a lithofacies scheme that allows construction of a detailed depositional model and environmental history of past ice sheet-ocean interactions at the eastern Ross Sea continental shelf break/slope since ~2.4 Ma. The earliest Pleistocene interval (~2.4- ~ 1.4 Ma) represents a hemipelagic environment dominated by ice-rafting and reworking/deposition by relatively persistent bottom current activity. Finely interlaminated silty muds with ice-rafted debris (IRD) layers are interpreted as contourites. Between ~1.4 and ~0.8 Ma, geostrophic bottom current activity was weaker and turbiditic processes more common, likely related to the increased proximity of grounded ice at the shelf edge. Silty, normally-graded laminations with sharp bases may be the result of flow-stripped turbidity currents overbanking the canyon levee during periods when ice was grounded at or proximal to the shelf edge. A sandy, IRD- and foraminifera-bearing interval dated to ~1.18 Ma potentially reflects warmer oceanographic conditions and a period of stronger Antarctic Slope Current flow. This may have enhanced upwelling of warm Circumpolar Deep Water onto the shelf, leading to large-scale glacial retreat at that time. The thickest interval of turbidite interlamination was deposited after ~1 Ma, following the onset of the Mid-Pleistocene Transition, interpreted as a time when most ice sheets grew and glacial periods were longer and more extreme. Sedimentation after ~0.8 Ma was dominated by glacigenic debris flow deposition, as the trough mouth fan that dominates the eastern Ross Sea continental slope prograded and expanded over the site. These findings will help to improve estimations of WAIS ice extent in future Ross Sea shelf-based modelling studies, and provide a basis for more detailed analysis of the inception and growth of the WAIS under distinct oceanographic conditions.
1998 •
https://servicioskoinonia.org/boff/articulo.php?num=402
0036 BoffSK (2003.10.24) Fin del mundo (II).2024 •
In 1996 archaeologists excavated over 70,000 inscribed pieces of wood from a well in Changsha, the largest such discovery ever made in China. They are local administrative records of the state of Wu in the 230s and provide remarkable detail on the society, governance, and economy of third century central China. Although Wu was one of the famous Three Kingdoms, its administrative history was poorly known until these documents were found, so we have written this book to explain the context and content of these document to help researchers use these valuable texts to rewrite the history of South China.
Nature Ecology & Evolution
Ancient DNA reveals admixture history and endogamy in the prehistoric AegeanAnarchist Studies Blog
"Out of the Morass: A Final Post-Mortem on Morris’s Ideological Readings."2018 •
Isabel Moctezuma, familia y encomienda
Isabel Moctezuma, familia y encomienda.EPRA International Journal of Multidisciplinary Research (IJMR)
Role and Performance of Public of Public Distribution System on Household’s Food Consumption in Odisha, IndiaCiência e Trópico
A Produção Internacional da Ideia de Informalidade Urbana e os "Núcleos Urbanos Informais" no Brasil2023 •
Duc Ai
CAC NHAN TO ANH HUONG SU HAI LONG CUA KHACH HANG CA NHAN DICH VU INTERNET - NGUYEN NGOC DUC AI2019 •
Zeitschrift für Antikes Christentum
Ambiguous Christians and Their Useful Texts: Tatian, Bardaisan, Symmachus, and Rhodon in Eusebius' Ecclesiastical History2023 •
Phyllis M. Messenger and George S. Smith (eds), Cultural Heritage Management, Policies and Issues in Global Perspective. Gainesville: University Press of Florida, 261–77.
2010 Archaeological looting and economic justice2010 •
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2006 •
Journal of Allergy and Clinical Immunology
A diagnostically relevant epitope of A. fumigatus2003 •
2024 •
Dokumentacja Geograficzna
Badania fizyczno-geograficzne otoczenia stacji naukowo-badawczej Instytutu Geografii PAN w Szymbarku. T. 1 /1970 •
Regards croisés sur l'économie
Politiques de la ville : bilan et (absence de) perspectives2011 •
Frontiers in Endocrinology
Androgen receptor in breast cancer: The “5W” questions