Subsidence along the central to southern Sanriku coast, northeast Japan, near the source region of the 2011 Tohoku-oki earthquake, estimated from the Holocene sedimentary succession along a ria coast

2017 ◽  
Vol 456 ◽  
pp. 1-16 ◽  
Author(s):  
Yuichi Niwa ◽  
Toshihiko Sugai ◽  
Yoshiaki Matsushima ◽  
Shinji Toda
Keyword(s):  
Source Region ◽  
Sanriku Coast ◽  
The Holocene ◽  
Sedimentary Succession

scholarly journals LGM–Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica

2002 ◽  
Vol 35 ◽  
pp. 306-312 ◽  
Author(s):  
Barbara Delmonte ◽  
Jean Robert Petit ◽  
Valter Maggi
Keyword(s):  
Size Distribution ◽  
Atmospheric Circulation ◽  
Total Concentration ◽  
Source Region ◽  
Ice Core ◽  
East Antarctica ◽  
Dust Particles ◽  
Absolute Minimum ◽  
The Holocene ◽  
Millennial Scale

AbstractMeasurements of the concentration and size distribution of dust particles found in the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core, East Antarctica, provide records covering the last 27000 years. the total concentration decreased drastically by a factor of 55 from the Last Glacial Maximum (LGM) (800 ppb) to the Holocene (15 ppb), with a well-marked absolute minimum around 11500–11600 years ago. This latter almost corresponds to the end of the Younger Dryas in Greenland, which was marked by a methane peak related to the expansion of tropical wetlands. Assuming that the source region forAntarctic dust is the southern part of South America, the Antarctic dust minimum suggests a larger geographical extent for this wet period. the volume (mass)-size distribution of the particles displays a mode which is close to 2 μm in diameter, shifting from 1.9 μm in the glacial period to 2.07 μm in the Holocene. As opposed to previous results from old Dome C, EPICA suggests a greater proportion of large particles in Holocene samples than in LGM samples. In addition, for the period 13 000–2000BP, structured millennial-scale oscillations of the dust mode appear. These are especially well marked before 5000 years ago, with higher frequencies also present. the difference between LGM and Holocene particle distributions may be related to changes in the pattern of dust transport to East Antarctica. At Dome C the greater proportion of coarse particles observed during the Holocene suggests greater direct meridional transport. During the LGM, atmospheric circulation was likely more zonal, causing a greater amount of large dust particles to be removed from the atmosphere before reaching Antarctica. Changes in atmospheric circulation could also be the cause of the millennial-scale dust-mode oscillations during the Holocene.

scholarly journals Depositional conditions on an alluvial fan at the turn of the Weichselian to the Holocene – a case study in the Żmigród Basin, southwest Poland

Geologos ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 105-120 ◽  
Author(s):  
Paweł Zieliński ◽  
Robert J. Sokołowski ◽  
Stanisław Fedorowicz ◽  
Barbara Woronko ◽  
Beata Hołub ◽  
...  
Keyword(s):  
Alluvial Fan ◽  
Luminescence Dating ◽  
Braided River ◽  
Gis Analysis ◽  
The Holocene ◽  
Sedimentary Succession ◽  
Late Weichselian ◽  
Stratigraphic Succession

Abstract Presented are the results of research into the fluvio-aeolian sedimentary succession at the site of Postolin in the Żmigród Basin, southwest Poland. Based on lithofacies analysis, textural analysis, Thermoluminescence and Infrared-Optical Stimulated Luminescence dating and GIS analysis, three lithofacies units were recognised and their stratigraphic succession identified: 1) the lower unit was deposited during the Pleni-Weichselian within a sand-bed braided river functioning under permafrost conditions within the central part of the alluvial fan; 2) the middle unit is the result of aeolian deposition and fluvial redeposition on the surface of the fan during long-term permafrost and progressive decrease of humidity of the climate at the turn of the Pleni- to the Late Weichselian; 3) the upper unit accumulated following the development of longitudinal dunes at the turn of the Late Weichselian to the Holocene; the development of dunes was interrupted twice by the form being stabilised by vegetation and soil development.

scholarly journals Provenance of coarse ice-rafted detritus near the SE Greenland margin

2000 ◽  
Vol 79 (1) ◽  
pp. 109-121 ◽  
Author(s):  
K. Linthout ◽  
S.R. Troelstra ◽  
A. Kuijpers
Keyword(s):  
Source Region ◽  
Late Glacial ◽  
Coarse Grained ◽  
East Greenland ◽  
The Holocene ◽  
East Greenland Current ◽  
Ice Stream ◽  
Denmark Strait ◽  
Thin Section Analysis ◽  
Greenland Margin

AbstractThe provenance of coarse-grained ice-rafted detritus has been studied, based on material collected from the SE Greenland margin. The sediment was sampled by a 1.5 m3 video-grab from 1256 m water depth. The fraction > 1cm was macroscopically investigated and a thin-section analysis was made. The results clearly show that East Greenland north of the Denmark Strait is the source region of the material sampled. The main provenance is from areas adjoining Kangerdlugssuaq Fjord, Blosseville Kyst, Scoresby Sund, Kong Oskar Fjord, and Kejser Franz Joseph Fjord. It can thus be demonstrated that significant ice-stream activity and iceberg calving occurred there. Present-day iceberg production is mainly concentrated to the Scoresby Sund, but the other areas apparently represent locations of larger ice-stream activity during periods prior to the Holocene.More generally, it can be concluded that southerly surface-water flow similar to the present East Greenland Current must also have occurred prior to the Holocene. Although either North America (Canada) or Scandinavia - or both - are generally referred to as important regions for the provenance of ice-rafted detritus, we conclude that (East) Greenland may have been an important source for (late) glacial North Atlantic ice-rafted detritus production as well.

scholarly journals Characteristics of Tephras Interbedded with the Holocene Sediments on the Sanriku Coast, Northeast Japan

2014 ◽  
Vol 123 (5) ◽  
pp. 671-697 ◽  
Author(s):  
Daisuke ISHIMURA ◽  
Keitaro YAMADA ◽  
Takahiro MIYAUCHI ◽  
Ryosuke HAYASE
Keyword(s):  
Sanriku Coast ◽  
The Holocene ◽  
Holocene Sediments

Petrogenesis and dynamic implications of the Cenozoic alkali basalts from Jingpohu volcanic field, Northeast China.

2021 ◽  
pp. SP510-2020-137
Author(s):  
Xiang Bai ◽  
Wei Wei ◽  
Hongmei Yu ◽  
Zhengquan Chen
Keyword(s):  
Northeast China ◽  
Source Region ◽  
Volcanic Field ◽  
Alkali Basalts ◽  
Mantle Transition Zone ◽  
Content Type ◽  
The Holocene ◽  
Mantle Source Region ◽  
Supplementary Material ◽  
Primary Magmas

AbstractThe Cenozoic alkali basalts are widely exposed in the Jingpohu volcanic field, Northeast China. Previous volcanology and geochronology researches have revealed that they were formed in three periods of Miocene (∼29.23-13.59 Ma), Pleistocene (∼83.7 Ka), and Holocene (∼5500-5200 a BP). The Miocene and Pleistocene basalts consist of alkali olivine basalts, while the Holocene basalts are composed of alkali olivine basalts and leucite tephrites. Petrogenetic studies reveal that the primary magmas of the Miocene and Pleistocene alkali olivine basalts originated from partial melting of EM2-like garnet peridotites, and those of the Holocene alkali olivine basalts were derived from melting of EM1- and EM2-like garnet peridotites with higher garnet proportions. In contrast, the primary magmas of Holocene leucite tephrites were derived from melting of eclogites and peridotites. Combined with previous researches, we suggest that melting of the mantle source region to generate Jingpohu alkali basalts was triggered by decarbonization and dehydration of the slabs stagnated in the mantle transition zone.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5227666

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