scholarly journals Continental Erosion/Weathering Changes in Central Asia Recorded in the Holocene Sediment from Lake Hovsgol, Northwest Mongolia, by Synchrotron μ-XRF Mapping Analyses

10.5772/38848 ◽  
2012 ◽  
Author(s):  
Nagayoshi Katsuta ◽  
Takuma Murakami ◽  
Yuko Wada ◽  
Masao Takano ◽  
Masayuki Kunugi ◽  
...  
Keyword(s):  
Central Asia ◽  
The Holocene ◽  
Holocene Sediment ◽  
Lake Hovsgol ◽  
Continental Erosion

scholarly journals Observations on Palaeogeographical Evolution of Akrotiri Salt Lake, Lemesos, Cyprus

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 321
Author(s):  
Miltiadis Polidorou ◽  
Niki Evelpidou ◽  
Theodora Tsourou ◽  
Hara Drinia ◽  
Ferréol Salomon ◽  
...  
Keyword(s):  
Climate Change ◽  
Landscape Evolution ◽  
Salt Lake ◽  
Active Tectonics ◽  
Scientific Interest ◽  
Progressive Change ◽  
The Holocene ◽  
Holocene Sediment ◽  
First Time ◽  
The City

Akrotiri Salt Lake is located 5 km west of the city of Lemesos in the southernmost part of the island of Cyprus. The evolution of the Akrotiri Salt Lake is of great scientific interest, occurring during the Holocene when eustatic and isostatic movements combined with local active tectonics and climate change developed a unique geomorphological environment. The Salt Lake today is a closed lagoon, which is depicted in Venetian maps as being connected to the sea, provides evidence of the geological setting and landscape evolution of the area. In this study, for the first time, we investigated the development of the Akrotiri Salt Lake through a series of three cores which penetrated the Holocene sediment sequence. Sedimentological and micropaleontological analyses, as well as geochronological studies were performed on the deposited sediments, identifying the complexity of the evolution of the Salt Lake and the progressive change of the area from a maritime space to an open bay and finally to a closed salt lake.

Long-term summer warming trend during the Holocene in central Asia indicated by alpine peat α-cellulose δ13C record

2019 ◽  
Vol 203 ◽  
pp. 56-67 ◽  
Author(s):  
Zhiguo Rao ◽  
Chao Huang ◽  
Luhua Xie ◽  
Fuxi Shi ◽  
Yan Zhao ◽  
...  
Keyword(s):  
Central Asia ◽  
Warming Trend ◽  
The Holocene ◽  
Summer Warming

scholarly journals Holocene Sediment Production in Lillooet River Basin, British Colombia: A Sediment Budget Approach

2007 ◽  
Vol 45 (1) ◽  
pp. 45-57 ◽  
Author(s):  
Peter Jordan ◽  
Olav Slaymaker
Keyword(s):  
Sediment Yield ◽  
Debris Flows ◽  
Sediment Budget ◽  
Sediment Supply ◽  
Volcanic Complex ◽  
Minor Importance ◽  
The Holocene ◽  
Sediment Production ◽  
Clastic Sediment ◽  
Holocene Sediment

ABSTRACTA sediment budget approach is used to investigate the sources, storage, and yield of clastic sediment in Lillooet River watershed, in the southern Coast Mountains. The 3150 km2basin is heavily glacierised, and includes a Quaternary volcanic complex which has been active in the Holocene. The sediment yield has been determined from the rate of advance of the delta at the basin outlet. The floodplain of the main river valley is aggrading as the delta advances, and probably has been through most of the Holocene. Major sediment sources in the basin include glaciers and Neoglacial deposits, debris flows, and landslides in the Quaternary volcanic complex. Soil and bedrock creep, bank erosion of Pleistocene glacial deposits, and sediment from logging and agriculture are probably of minor importance. Estimates of sediment production from these sources explain only about half the observed clastic sediment yield plus the rate of valley aggradation. The unexplained sediment production may be associated with paraglacial sediments exposed by glacial retreat from the nineteenth century Neoglacial maximum; alternatively the frequency of occurrence of intermediate scale debris flows and landslides has been seriously underestimated. Sediment supply is highly episodic over time scales of centuries to thousands of years. Major factors in the temporal pattern of Holocene sediment supply are periods of volcanism, large landslides, the retreat of glaciers from the Neoglacial maximum, and recent river engineering works.

First Holocene floating varve chronology in Central Asia from the Lake Chatyr Kol sediment record (Kyrgyz Republic)

2020 ◽  
Author(s):  
Julia Kalanke ◽  
Jens Mingram ◽  
Stefan Lauterbach ◽  
Ryskul Usubaliev ◽  
Achim Brauer
Keyword(s):  
Central Asia ◽  
Mountain Lake ◽  
Lake Basin ◽  
High Mountain ◽  
Kyrgyz Republic ◽  
Sediment Record ◽  
Thin Sections ◽  
The Holocene ◽  
Sediment Profile ◽  
Varve Chronology

<p>We present the first floating varve chronology in arid Central Asia of a finely laminated lake sediment record from the high-mountain Lake Chatyr Kol (Kyrgyz Republic). The record was retrieved from the deepest part (~20m) of the lake basin and comprises seasonal laminations (varves) from 11,619 ± 603 years BP to 360 ± 40 BP years. The identification of varves is based on seasonal deposition models established from continuous thin section analyses of the entire sediment profile. The varves comprise a complex pattern of six different micro-facies types throughout the Holocene. All varve types include a pronounced clastic-detrital sublayer, but the composition of their summer sublayers varies between organic, diatom, calcite, and aragonite sublayers. Based on replicate varve counts on overlapping petrographic thin sections an uncertainty of ± 5 % has been calculated for the varve chronology. The chronology is floating because in the uppermost part of the sediment profile varves have been only occasionally formed or preserved which prevented from continuous varve counting in this interval. Instead, the non-varved interval has been dated with <sup>210</sup>Pb and <sup>137</sup>Cs γ-spectrometry providing an age for anchoring the floating chronology to the absolute time scale. The resulting chronology is supported by two <sup>14</sup>C ages obtained from terrestrial plant macrofossils. In contrast, radiocarbon dating of aquatic materials showed significantly older ages and prove reservoir effects. Through comparison with the varve chronology changes in reservoir effects throughout the Holocene have been determined. We find a stepwise decline of reservoir ages from up to ~6150 years in the early Holocene to lowest reservoir ages of less than 1000 years in the late Holocene. In addition to their value as chronological tool, changes in varve thickness and seasonal sublayer composition are used as proxies for hydro-climatological reconstruction of Holocene climate evolution.</p><p>This is a contribution to the CAHOL project, part of the BMBF-funded and integrated project CAME II.</p>

scholarly journals Present‐Day Subsidence in the Ganges‐Brahmaputra‐Meghna Delta: Eastern Amplification of the Holocene Sediment Loading Contribution

2019 ◽  
Vol 46 (19) ◽  
pp. 10764-10772 ◽  
Author(s):  
Y. Krien ◽  
M. Karpytchev ◽  
V. Ballu ◽  
M. Becker ◽  
C. Grall ◽  
...  
Keyword(s):  
Sediment Loading ◽  
The Holocene ◽  
Holocene Sediment ◽  
The Ganges

Chara nikolskae, a new name for Chara elliptica Nikolskaja (1984) non Fritzsche (1924) and Aclistochara elliptica (Fritzsche) comb. nov. (Characeae)

Phytotaxa ◽  
2015 ◽  
Vol 226 (2) ◽  
pp. 199
Author(s):  
Alexander Borisovitch Doweld
Keyword(s):  
South America ◽  
Central Asia ◽  
Algal Species ◽  
Fossil Plant ◽  
Fossil Species ◽  
The Holocene ◽  
New Name ◽  
Plant Names ◽  
Holocene Sediments ◽  
The Creation

The fossil species Chara elliptica Nikolskaja (1984: 1092) was established on the gyrogonite remains from the Holocene sediments of Majkara (Kazakhstan, Central Asia). However, according to Art. 53.1 of ICN (McNeill et al., 2012) this name is illegitimate because of the existence of an overlooked earlier homonym, Chara elliptica Fritzsche (1924: 93) which was originally described from the earlier Cretaceous (Campanian) deposits of Tres Cruces and Negra Muerta, Province Jujuy, North Argentina (South America). Due to the creation of the International Fossil Plant Names Index with listing of all fossil plant and algal species, the fact of the homonymy between fossil species was solidly established (IFPNI, 2014-).

CO2/H2O and orbitally driven climate variability over central Asia through the Holocene

2005 ◽  
Vol 136 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Andrew B.G. Bush
Keyword(s):  
Climate Variability ◽  
Central Asia ◽  
The Holocene

Long-term winter/summer warming trends during the Holocene revealed by α-cellulose δ18O/δ13C records from an alpine peat core from central Asia

2020 ◽  
Vol 232 ◽  
pp. 106217 ◽  
Author(s):  
Zhiguo Rao ◽  
Fuxi Shi ◽  
Yunxia Li ◽  
Chao Huang ◽  
Xinzhu Zhang ◽  
...  
Keyword(s):  
Central Asia ◽  
The Holocene ◽  
Peat Core ◽  
Summer Warming
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