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991.
Tobias Lauer Rainer Bonn Manfred Frechen Magret C. Fuchs Marcus Trier Sumiko Tsukamoto 《Geochronometria》2011,38(4):341-349
Due to the construction of a new North-South subway in Cologne, Roman time harbour sediments were exposed and were sampled
for luminescence dating. A very good independent age control was given by the precise knowledge of the chronology of Roman
activity and by radiocarbon ages of charcoal samples. Hence, different methodological approaches within luminescence dating
were applied for Holocene heterogeneously bleached fluvial samples and were compared to the known ages. For one sample, optically
stimulated luminescence (OSL) dating was applied to coarse-grained quartz using a single aliquot regenerative-dose (SAR) protocol.
After De-measurements, different statistical approaches were tested (i.e. arithmetic mean, median, minimum age model, finite mixture
model, leading edge method and the Fuchs and Lang approach). It is demonstrated that the Fuchs and Lang approach along with
the leading edge method yielded the best matching OSL ages with respect to the known ages. 相似文献
992.
The luminescence dating of the K-feldspar fraction is an alternative way for samples that cannot yield reasonable equivalent
dose (De) from quartz fraction with very weak luminescence signal. For testing the reliability of the infrared stimulated luminescence
(IRSL) dating of K-feldspar, luminescence dating was applied to quartz and K-feldspar fractions respectively for several Holocene
samples in this study. K-feldspar apparent ages using routine single aliquot regenerative-dose (SAR) protocol, K-feldspar
ages using g value correction method and ages from isochron dating method were compared with quartz ages. It is found that
the g value correction method cannot give reliable ages due to the large errors induced during measurements. The isochron
dating method is effective to the sample with problematically external dose rate. However, isochron dating may introduce a
relatively greater error during grain sizes — De curve fitting, therefore this method could obtain low-resolution ages for Holocene samples. Even K-feldspar apparent age
from routine SAR protocol is relatively younger by about 10% than the quartz age, it still could establish reasonable chronological
framework for Holocene samples. 相似文献
993.
Nataliya E. Zaretskaya Nataliya V. Shevchenko Alexandra N. Simakova Leopold D. Sulerzhitsky 《Geochronometria》2011,38(2):116-127
In this paper, a detailed overview of the Holocene evolution of the North Dvina river (ND) delta (southern White Sea) is presented; it is based on radiocarbon dating, geomorphological and other field surveys, and plant macrofossil and palynological data. We have identified three main stages of the delta evolution: estuary erosional (Allerød — 5700 cal BC), lagoon or tidal-marsh (5700 cal BC — 3700 cal BC) and fan-delta accumulative (3700 cal BC — present). These stages are correlated with local climatic curves, sea level changes, glacioisostatic raise curve and Baltic Sea stages. A variety of landforms has been identified and dated within the delta. These results help to explain the spatial and temporal patterns in the prehistoric human occupation of this area. 相似文献
994.
Maria Łanczont Andrij B. Bogucki Stanisław Fedorowicz Jarosław Kusiak 《Geochronometria》2011,38(4):350-358
The history of the interlaboratory comparison of TL dating results in Poland started in the 1980s. At that time the Lublin,
Warsaw and Silesian laboratories made the first attempts at TL dating of the same loess samples from the Odonów profile. However,
the cooperation ceased for many years due to great differences in the obtained TL age estimates. The next interlaboratory
comparisons were made in the years 2000–2009 for the loess samples from several Polish (Dybawka, Tarnawce, Dankowice, Biały
Kościół) and Ukrainian (Boyanychi, Halych, Velykyj Hlybochok, Yezupil) profiles. Most of the compared dates, obtained for
the loess deposits from the Upper Pleistocene and younger part of the Middle Pleistocene, were consistent. This encouraged
us to undertake the Gdańsk-Lublin interlaboratory cooperation in dating of 200-700 ka old loess deposits. Nine samples were
taken from the Ukrainian profile Mamalyha 2 in 2009 for this purpose. The TL dating results indicate that comparable dates
are obtained in two laboratories for loess deposits younger than 300 ka BP. The TL signal obtained in the Gdańsk laboratory
for the samples older than 300 ka BP was saturated so such samples should not be dated by the multi-aliquot regeneration method.
The results obtained in the Lublin laboratory for these deposits (489–682 ka) confirm that it is possible to date loess deposits
older than 500 ka. It probably results from the use of total-bleach method with preheating at 160°C for the equivalent dose
determination. 相似文献
995.
996.
The thermoluminescence phenomenon has been used for pottery dating and radiation dosimetry for sixty years and for forty years
has been applied to the study of meteorites, being successful in quantifying metamorphic histories and providing new insights
into terrestrial age and orbits. Here we review some of the fundamental properties of thermoluminescence with particular focus
on the study of small extraterrestrial particles. We suggest that natural TL data can be used to identify the burial and release
history of cometary particles and that induced TL measurements can provide in-sights into the mineralogy of particles (even
when largely amorphous) and the metamorphic history of those particles. We illustrate the use of TL to study small particles
by describing recent studies on micrometeorites and 10–100 μm fragments taken from the matrix of a meteorite Semarkona which
is type 3.0 ordinary chondrite. 相似文献
997.
Sharad N. Rajaguru Bhaskar C. Deotare Kaushik Gangopadhyay Malay K. Sain Sheena Panja 《Geochronometria》2011,38(3):282-291
Archaeological studies in the upper and lower part of the Ganga-Bhaghrathi-Hugli delta were taken up to understand the nature
of site formation and human adaptation in a dynamic fluvial zone. This aspect has been neglected in Indian archaeology. However
archaeological dating using typological information, has an error margin of a couple of centuries and hence, is of limited
use. We suggest that high resolution chronology using Optically Stimulated Luminescence (OSL) and radiocarbon dating can be
quite effective in the study of archaeology and human environment relationship in the Ganga-Brahmaputra Delta (GBD). 相似文献
998.
The paper deals with dendrochronological and radiocarbon dating of subfossil trunks found in the basin of the Morava River.
The research into subfossil trunks had been conducted in the Czech Republic in the past but the research stopped in 2001.
160 records of measurements of subfossil, predominantly oak trunk samples, are preserved from that time. Three years ago the
research was reopened and again the most trunks were found in the basin of the Morava River. 92 samples of oak trunks and
7 samples of other tree species (poplar, elm, maple, beech) were taken from selected sites. The samples were processed in
compliance with the standard dendrochronological methodology. To date the samples, Czech, Austrian, Polish and German standard
chronologies were used. In cases when the dendrochronological dating was unsuccessful, the samples were sent for radiocarbon
dating. In total, 35 samples were dated, mainly by the radiocarbon method. Subfossil trunks from gravel pit Tovačov were dated
and classified into 4 different periods, the oldest being from 2780–2190 BC. In Osek nad Bečvou, the samples were taken from
two sites. Whereas from the 4 trunks taken in the river channel each was from a different period, the trunks from the gravel
pit come from 981–1015 AD. The trunks found in the Morava River basin near Strážnice were dated to the 10th–15th century. In the future, we expect to extend the amount of the acquired samples with the aim to create a link to the existing
standard chronology or to create a long floating average treering curve. 相似文献
999.
The present study focuses on investigations carried out in the Late Vistulian succession of the Warta River deposits (central
Poland) in which a horizon of subfossil trees was excavated. Prelim-inary conclusions on time record and past environmental
conditions of a forest existence determined from radiocarbon dating, pollen analyses and geological evidence appear promising
with view of tree-ring chronologies. 相似文献
1000.
A.D. SWITZER B.L. MAMO D. DOMINEY‐HOWES L.C. STROTZ C. COURTNEY B.G. JONES S.K. HASLETT D.M. EVERETT 《Geographical Research》2011,49(4):408-430
An unusual coarse, shelly sedimentary unit is found elevated above present mean sea level in a sheltered pocket embayment at Old Punt Bay in south‐eastern Australia. The coarse sediments, diverse microfauna, and large shelly macrofauna of mixed affinity suggest that the deposit is the result of high‐energy deposition. The deposit was previously thought to have been deposited 1000–1300 cal bp based on one shell dated using 14C and amino acid racemisation. However, additional 14C dating indicates a likely age of ~2500 cal bp . Regardless of age constraints, the presence of rock‐encrusting oyster shells and large articulated bivalves, suggests that the depositional event must have been capable of removing and transporting coarse sediments (rock clasts), bivalves, and oysters shells from a variety of seaward environments and depositing them with little abrasion, something storm waves are unlikely to do. The deposit may be tsunamigenic. If a tsunami origin is accepted, the new dating results indicate that it is possibly coeval with a tsunami event previously reported to have affected several other sites along the coast of New South Wales at c. 2900 cal bp . Consequently, this deposit provides evidence for the event at a new site and importantly, a tighter constraint on the likely date of the events occurrence. It further adds weight to the developing catalogue of palaeotsunamis that may have affected the south‐eastern coast of Australia. Regardless of the deposit's origins, if viewed from a coastal planning perspective, this deposit indicates that this part of the coast has experienced large‐scale overwash events in the past that if repeated, would be catastrophic. There are serious implications for risk management. 相似文献