Quaternary Research
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Downward Migration of Coastal Conifers as a Response to Recent Land Emergence in Eastern Hudson Bay, Québec
Quaternary Research - Tập 40 - Trang 81-88 - 1993
AbstractPostglacial uplift in the eastern Hudson Bay area is among the most
rapid in the world (300 m during the last 8000 yr). Although emergence curves
based on 14 C-dated raised shorelines give a consistent basis for modeling
relative sea-level changes, such a low-resolution dating method is inappropriate
for estimating trends over recent decades. A major downward displacement of
white spruce (...
The postglacial history of three Picea species in New England, USA
Quaternary Research - Tập 59 - Trang 61-69 - 2003
AbstractGiven the difficulty of separating the three Picea species—P. glauca, P.
mariana, and P. rubens (white, black, and red spruce)—in the pollen record,
little is known about their unique histories in eastern North America following
deglaciation. Here we report the first use of a classification tree analysis
(CART) to distinguish pollen grains of these species. It was successfully
applied to f...
Holocene Paleoclimates of India
Quaternary Research - Tập 66 - Trang 442-453 - 2006
AbstractWe present a comprehensive summary of the available palaeoclimate
records from India and compare the results from different proxies. The results
indicate (i) fluctuating lake levels during the early Holocene. The period of
relatively higher lake levels from increased precipitation efficiency was
reached only ∼7.2–6.0 cal kyr BP, possibly due to increased contribution from
winter rainfall; ...
Mid-Holocene climate change and its effect on prehistoric cultural evolution in eastern Qinghai Province, China
Quaternary Research - Tập 77 - Trang 23-30 - 2012
We studied the mid-Holocene climate change in eastern Qinghai Province, China
and its impact on the evolution of Majiayao (3980–2050 BC) and Qijia (2183–1635
BC) cultures, near the important Neolithic site of Changning. The investigation
focused on analyses of grain size, magnetic susceptibility, ratios of elemental
contents, and pollen assemblage from a loess-paleosol sequence. The results
indica...
A Record of Holocene Climate Change from Lake Geochemical Analyses in Southeastern Arabia
Quaternary Research - Tập 66 Số 3 - Trang 465-476 - 2006
AbstractLacustrine sediments from southeastern Arabia reveal variations in lake
level corresponding to changes in the strength and duration of Indian Ocean
Monsoon (IOM) summer rainfall and winter cyclonic rainfall. The late
glacial/Holocene transition of the region was characterised by the development
of mega-linear dunes. These dunes became stabilised and vegetated during the
early Holocene and ...
Charophyte remains from Wadi Howar as evidence for deep mid-Holocene freshwater lakes in the eastern Sahara of Northwest Sudan
Quaternary Research - Tập 36 Số 2 - Trang 210-223 - 1991
AbstractField research in the eastern Sahara (Northwest Sudan) revealed
extensive early- to mid-Holocene lake marl deposits bearing gyrogonites of
Charophytes (green algae, stoneworts) along the lower course of the Wadi Howar,
an extinct tributary to the Nile. The Charophyte flora of a paleolake southwest
of Jebel Rahib (17°31′N/26°52′E) dated prior to 4720 ± 110 yr B.P. is mainly
composed of the ...
Ancient pine forest on inland dunes in the Spanish northern meseta
Quaternary Research - Tập 63 - Trang 1-14 - 2005
We present a new stratigraphic (pollen and nonpollen microfossils and charcoal
particle) sequence with five AMS dates, covering about the last 9000 yr, of a
core collected from the Spanish northern meseta, one of the territories of the
Iberian Peninsula for which little paleobotanical information is available. The
results support the hypothesis of the permanence of the pine forests, in more or
les...
Influence of a glacial buzzsaw on the height and morphology of the Cascade Range in central Washington State, USA
Quaternary Research - Tập 65 - Trang 96-107 - 2006
AbstractAnalysis of climatic and topographic evidence from the Cascade Range of
Washington State indicates that glacial erosion limits the height and controls
the morphology of this range. Glacial erosion linked to long-term spatial
gradients in the ELA created a tilted, planar zone of 373 cirques across the
central part of the range; peaks and ridges now rise ≤600 m above this zone.
Hypsometric a...
Changes in the glacier extent and surface elevation along the Ningchan and Shuiguan river source, eastern Qilian Mountains, China
Quaternary Research - Tập 81 - Trang 531-537 - 2014
AbstractWe investigate the changes at nine glaciers in the Ningchan and Shuiguan
river source, eastern Qilian Mountains, between 1972 and 2010. According to
analysis of topographic maps and multispectral satellite data, all nine glaciers
in the study area have retreated, by a maximum of 250 ± 57.4 m and a minimum of
91 ± 57.4 m. The total glacier area decreased by 1.20 km2, corresponding to 9.9%
o...
Sea-Level Estimates during the Last Deglaciation Based on δ18O and Accelerator Mass Spectrometry 14C Ages Measured in Globigerina bulloides
Quaternary Research - Tập 31 - Trang 381-391 - 1989
AbstractCoupled measurements of δ18O and accelerator mass spectrometry (AMS) 14C
in a particular species of planktonic foraminifera may be used to calculate
sea-level estimates for the last deglaciation. Of critical importance for this
type of study is a knowledge of the seasonality of foraminiferal growth, which
can be provided by δ18O measurements of modern shells (core tops, plankton
tows). Iso...
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