Late Quaternary aeolian activity in Gonghe Basin, northeastern Qinghai-Tibetan Plateau, China

2013 ◽  
Vol 79 (3) ◽  
pp. 403-412 ◽  
Author(s):  
Mingrui Qiang ◽  
Fahu Chen ◽  
Lei Song ◽  
Xingxing Liu ◽  
Mingzhi Li ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Quaternary ◽  
Optically Stimulated Luminescence ◽  
Aeolian Sand ◽  
Aeolian Deposits ◽  
Effective Moisture ◽  
Aeolian Activity ◽  
History Of ◽  
Gonghe Basin ◽  
Semi Arid

AbstractAeolian deposits at four sites in the Gonghe Basin were used to reconstruct the history of aeolian activity over the late Quaternary. These deposits include well-sorted aeolian sand, paleosols and/or loess. Aeolian sand represents dune-field expansion and/or dune buildup, whereas paleosols indicate stabilization of dunes, accompanying ameliorated vegetation cover. On the basis of 25 dates by optically stimulated luminescence (OSL), it appears that aeolian activities occurred episodically at 33.5, 20.3, 13.9, 11.8–11.0, 9.4, 7.8, and 5.7 (5.5) ka, which is largely consistent with the recent findings from the adjacent semi-arid areas. Aeolian sand mobility occurring during the early to mid Holocene conflicts with a climatic optimum inferred from lacustrine records in the northeastern Qinghai-Tibetan Plateau. This inconsistency may be resolved by interpreting aeolian activity as a response to decreased effective moisture due to enhanced evaporation, induced by higher summer insolation at that time, together with local terrain and its effects on moisture. Our results suggest that aeolian sand and paleosol cannot be simply ascribed to regional dry and wet climates, respectively, and they most likely reflect changes in effective moisture.

scholarly journals Araçatuba Formation: palustrine deposits from the initial sedimentation phase of the Bauru Basin

2003 ◽  
Vol 75 (2) ◽  
pp. 173-187 ◽  
Author(s):  
Luiz A. Fernandes ◽  
Paulo C. F. Giannini ◽  
Ana Maria Góes
Keyword(s):  
Upper Cretaceous ◽  
Drainage System ◽  
Arid Climate ◽  
Sedimentary Sequence ◽  
Aeolian Sand ◽  
Desiccation Cracks ◽  
Aeolian Deposits ◽  
Saline Waters ◽  
Semi Arid

The Bauru Basin (Upper Cretaceous) accumulated an essentially sandy continental sedimentary sequence. In a first desertic phase the basaltic substratum was covered by a widespread and homogeneous aeolian sand unit with minor loess intercalations. The substratum relief favored the formation of an endorheic drainage system under semi-arid climate, a process that started the development of the Araçatuba Paleoswamp. The palustrine deposits (Araçatuba Formation) comprise siltstone and tipically greenish gray narrow tabular strata of sandstone cemented by carbonate. Moulds and gypsite and dolomite pseudomorphs were identified. The moulds seem to be genetically associated with desiccation cracks, root marks and climbing ripple lamination levels, that, on the whole, indicate calm shallow saline waters undergoing phases of subaerial exposition. At the boundaries of the study area, sand units may exhibit sigmoidal features and convolute bedding structure, which is characteristic of marginal deltaic deposits. The Araçatuba Formation is enclosed in and later overlaid by the aeolian deposits of the Vale do Rio do Peixe Formation.

scholarly journals Stepwise Weakening of Aeolian Activities During the Holocene in the Gannan Region, Eastern Tibetan Plateau

2021 ◽  
Vol 9 ◽  
Author(s):  
Shengli Yang ◽  
Xiaojing Liu ◽  
Ting Cheng ◽  
Yuanlong Luo ◽  
Qiong Li ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Environmental Changes ◽  
Climatic Changes ◽  
Early Holocene ◽  
Eastern Tibetan Plateau ◽  
Aeolian Desertification ◽  
The Holocene ◽  
Aeolian Sediments ◽  
Aeolian Activity ◽  
History Of

Aeolian sediments hold key information on aeolian history and past environmental changes. Aeolian desertification and extensive land degradation have seriously affected the eco-environment in the Gannan region on the eastern Tibetan Plateau. Understanding the history of aeolian activities can deepen our understanding of the impacts of climatic changes on aeolian activities in the future. This study uses a detailed chronology and multiple proxy analyses of a typical aeolian section in Maqu to reconstruct aeolian activities in the region during the Holocene. Our results showed that aeolian activities have occurred in the eastern Tibetan Plateau since the early Holocene. Magnetic susceptibility, grain size records, and paleosols formation indicated a trend of stepwise weakening in aeolian activities from the early Holocene to the present. The weakening of aeolian activities was divided into three stages: ∼10.0–8.0 ka BP, ∼8.0–4.0 ka BP, and ∼4.0 ka BP to the present. Paleosols were primarily formed after ∼8.0 ka BP, and episodically interrupted aeolian activities processes in the Gannan region. Aeolian activity may increase in the Gannan region as the climate gradually warms. Climatic changes and local hydrological conditions have jointly affected the history of aeolian activities in this region.

Holocene aeolian sand mobilization, vegetation history and human impact on the stabilized sand dune area of the southern Nyírség, Hungary

2012 ◽  
Vol 78 (3) ◽  
pp. 492-501 ◽  
Author(s):  
Tímea Kiss ◽  
György Sipos ◽  
Barbara Mauz ◽  
Gábor Mezősi
Keyword(s):  
Sand Dune ◽  
Vegetation History ◽  
Agricultural Practices ◽  
Alluvial Fan ◽  
Optically Stimulated Luminescence ◽  
Anthropogenic Factors ◽  
Aeolian Sand ◽  
Humid Climate ◽  
Aeolian Activity ◽  
First Time

AbstractAlmost 20% of the territory of Hungary is covered by stabilized dunes formed during the Pleistocene. With the climate amelioration during the early Holocene the aeolian activity ceased. However, various environmental and anthropogenic factors could have reactivated the aeolian processes. Today, there is an increasing climatic stress on the dune fields of the Carpathian Basin, which is coupled with inadequate land use. It is therefore necessary to determine the timing and circumstances of sand mobilization during the Holocene. The site of the present study is located in a dune–interdune system on the southern part of the Nyírség alluvial fan, where periods of Holocene aeolian activity and environmental change were investigated using palynological and sedimentological methods, optically stimulated luminescence and radiocarbon dating. The data achieved show climate-driven Boreal aeolian activity at approximately 8.2 ka, and also demonstrate for the first time that during the Atlantic Phase (6.4 and 5.3 ka), in spite of the relatively humid climate and dense vegetation, aeolian activity has taken place, induced probably by agricultural practices. Following Subboreal morphological stability, aeolian activity occurred several times in the Subatlantic Phase (2.4–2.2, 1.2–0.8 and 0.4–0.1 ka) as a result of vegetation changes and human activity.

Late Quaternary paleoenvironments and paleoclimatic conditions in the distal Andean piedmont, southern Mendoza, Argentina

2011 ◽  
Vol 76 (2) ◽  
pp. 253-263 ◽  
Author(s):  
Alfonsina Tripaldi ◽  
Marcelo A. Zárate ◽  
George A. Brook ◽  
Guo-Qiang Li
Keyword(s):  
Late Quaternary ◽  
Semiarid Region ◽  
Aeolian Deposits ◽  
Aeolian Activity ◽  
Facies Associations ◽  
Sand Sheet ◽  
Size And Morphology ◽  
Paleoclimatic Significance ◽  
San Rafael ◽  
The Last Glacial

AbstractThe Andean piedmont of Mendoza is a semiarid region covered by extensive and partially vegetated dune fields consisting of mostly inactive aeolian landforms of diverse size and morphology. This paper is focused on the San Rafael plain (SRP) environment, situated in the distal Andean piedmont of Mendoza (34° 30′S), and reports the sedimentology and OSL chronology of two representative exposures of late Quaternary deposits, including their paleoenvironmental and paleoclimatic significance. Eleven facies, including channel, floodplain, fluvio–aeolian interaction, and reworked pyroclastic and aeolian deposits, were described and grouped into two facies associations (FA1 and FA2). FA1 was formed by unconfined sheet flows, minor channelized streams and fluvial–aeolian interaction processes. FA2 was interpreted as aeolian dune and sand-sheet deposits. OSL chronology from the SRP sedimentary record indicates that between ca. 58–39 ka and ca. 36–24 ka (MIS 3), aggradation was governed by ephemeral fluvial processes (FA1) under generally semiarid conditions. During MIS 2, the last glacial maximum (ca. 24–12 ka), a major climatic shift to more arid conditions is documented by significant aeolian activity (FA2) that became the dominant sedimentation process north of the Diamante–Atuel fluvial system. The inferred paleoenvironmental conditions from the SRP sections are in broad agreement with regional evidence.

Holocene climatic change revealed by aeolian deposits from the Gonghe Basin, northeastern Qinghai–Tibetan Plateau

2013 ◽  
Vol 296 ◽  
pp. 231-240 ◽  
Author(s):  
Bing Liu ◽  
Heling Jin ◽  
Liangying Sun ◽  
Zhong Sun ◽  
Zhizhu Su ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Climatic Change ◽  
Aeolian Deposits ◽  
Gonghe Basin

Late Quaternary vegetation history of Kettlehole Pond, southwestern Yukon

1988 ◽  
Vol 18 (10) ◽  
pp. 1270-1279 ◽  
Author(s):  
Les C. Cwynar
Keyword(s):  
Vegetation History ◽  
Late Quaternary ◽  
Initial Period ◽  
Forest Tree ◽  
Published Data ◽  
Vegetation Changes ◽  
Pollen Diagram ◽  
Mesic Forest ◽  
Effective Moisture ◽  
History Of

A pollen diagram with a detailed chronology reveals Late-Pleistocene and Holocene vegetation changes which, in combination with previously published data, provide information on regional vegetation changes in the western boreal forest of the southwestern Yukon. A Populus woodland with an understory of Shepherdiacanadensis and extensive open areas dominated by Artemisia occurred from 11 030 to 9250 BP. Juniperus populations expanded at 9700 BP and then more-mesic forest communities developed when Piceaglauca populations increased at 9250 BP and Populus declined. At 6100 BP there is a remarkable shift from Piceaglauca woodland with Juniperus to a mixed spruce forest in which P. mariana was the dominant species. At 4100 BP conditions altered to favour P. glauca which expanded at the expense of P. mariana, and Juniperus again became important in the vegetation. By 1900 BP Pinuscontorta had become a dominant tree as P. mariana declined, the latter eventually disappearing from the local vegetation. There is no evidence that grasslands were more extensive in the early Holocene, as has been hypothesized for the southwestern Yukon. The vegetation sequence implies an initial period of aridity from 11 030 to 9250 BP, when summer warmth was probably greater than that of the modern climate, a period of increased effective moisture between 9250 and 6100 BP, when Piceaglauca was abundant, even greater effective moisture between 6100 and 4100 BP, when Piceamariana was the dominant forest tree, and then a prolonged period of increasing aridity beginning at 4100 BP and culminating in the development of the modern semi-arid climate.

Luminescence-dated aeolian deposits of late Quaternary age in the southern Tibetan Plateau and their implications for landscape history

2009 ◽  
Vol 72 (3) ◽  
pp. 421-430 ◽  
Author(s):  
ZhongPing Lai ◽  
Knut Kaiser ◽  
Helmut Brückner
Keyword(s):  
Tibetan Plateau ◽  
Late Quaternary ◽  
Age Distribution ◽  
Sediment Accumulation ◽  
Global Scale ◽  
The Tibetan Plateau ◽  
Last Deglaciation ◽  
Aeolian Deposits ◽  
The Last Deglaciation ◽  
Environmental Responses

AbstractAeolian deposits are widely distributed in the interior of the Tibetan Plateau, and their chronology is poorly known. It is not yet clear whether they accumulated only after the last deglaciation, or over a longer time. We applied quartz OSL dating to aeolian samples from the Lhasa area with OSL ages ranging from 2.9 ± 0.2 to at least 118 ± 11 ka. The probability density frequency (PDF) distribution of 24 ages reveals age clusters at about 3, 8, 16–21, 33, and 79–83 ka, indicating enhanced sediment accumulation then. The results show that aeolian deposition occurred throughout most of the last 100 ka. This implies that: 1) an ice sheet covering the whole Tibetan Plateau during the last glacial maximum (LGM) could not have existed; and 2) erosion during the last deglaciation was not as strong as previously proposed, such that not all pre-Holocene loess was removed. The age distribution shown in the PDF indicates that aeolian accumulation is episodic. Sand-formation events revealed by age clusters at 3, 8, and 16–21 ka imply roughly synchronous environmental responses to corresponding global-scale arid events.

scholarly journals Timing and Sedimentary Record of Late Quaternary Fluvio-Aeolian Successions of the Tura-Pyshma Interfluve (SW Western Siberia, Russia)

Geosciences ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 396
Author(s):  
Oleg Sizov ◽  
Alexandr Konstantinov ◽  
Anna Volvakh ◽  
Anatoly Molodkov
Keyword(s):  
Western Siberia ◽  
Late Quaternary ◽  
Late Glacial ◽  
Northern Eurasia ◽  
Sedimentary Record ◽  
Aeolian Deposits ◽  
Aeolian Activity ◽  
Geomorphic Features ◽  
Periglacial Zone ◽  
Two Stages

The sedimentary record of aeolian deposits and geomorphic features of the aeolian landforms of Northern Eurasia contain important information that allows us to better understand the climate and environments of the Late Glacial and Early Holocene periods. At the same time, the degree of scientific knowledge about the timing of aeolian activity, as well as the landscapes that existed during these periods, differs significantly for different parts of this vast territory. Data on the sedimentological record and age estimations of aeolian phases are practically absent for the periglacial zone of Western Siberia, in contrast to that of Europe. This paper presents the first data on the Late Quaternary fluvio-aeolian environments of the southwestern part of Western Siberia, using two sections as examples. Our methods included field investigations, analysis of grain-size and chemical composition, quartz grain morphoscopy and infrared optically stimulated luminescence (IR-OSL) and AMS dating. The obtained results show that aeolian sands are common covering deposits within the study area. Two stages of aeolian activity were identified: the first during the Boreal period (9.2–10.2 ka BP), and the second during the Atlantic period, beginning near 7 ka BP.

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