A radiocarbon age determination for Mount Edgecumbe (Putauaki) volcano, Bay of Plenty, New Zealand

1997 ◽  
Vol 40 (4) ◽  
pp. 559-562 ◽  
Author(s):  
L. D. Carroll ◽  
J. A. Gamble ◽  
B. F. Houghton ◽  
T. Thordarson ◽  
T. F. G. Higham
Keyword(s):  
New Zealand ◽  
Age Determination ◽  
Radiocarbon Age

scholarly journals Grave of the Corded Ware culture from Węgrzce, Kraków District

2020 ◽  
Vol 88 ◽  
pp. 63-78
Author(s):  
Maciej Nowak ◽  
Barbara Musiał-Łaczek ◽  
Piotr Włodarczak
Keyword(s):  
Age Determination ◽  
Local Features ◽  
Radiocarbon Age ◽  
Funeral Rite ◽  
Detached House ◽  
Archaeological Excavations

Grave 3/2016 from site 3 in Węgrzce, Comm. Zielonki, Kraków District was discovered during archaeological excavations preceding construction of a detached house. This was a niche grave, holding two burials: a male aged 38–47 years, and a child 4–5 years old. The recorded funeral rite is characteristic of a cluster of Corded Ware culture cemeteries on the lower Dłubnia River, near Kraków. A vessel recovered from the grave reveals local features characteristic of that cluster. One radiocarbon age determination was obtained for the burial, pointing to ca. 2470–2350 BC as the most likely range. Thus, the grave links with the younger phase of the Final Eneolithic in Lesser Poland.

A Reassessment of U-Th and14C Ages for Late-Glacial High-Frequency Hydrological Events at Searles Lake, California

1998 ◽  
Vol 49 (1) ◽  
pp. 11-23 ◽  
Author(s):  
Jo C. Lin ◽  
Wallace S. Broecker ◽  
Sidney R. Hemming ◽  
Irena Hajdas ◽  
Robert F. Anderson ◽  
...  
Keyword(s):  
High Frequency ◽  
Radiocarbon Dating ◽  
Age Determination ◽  
Ice Cores ◽  
Close Correlation ◽  
Late Glacial ◽  
Radiocarbon Age ◽  
Abrupt Changes ◽  
Dry Conditions ◽  
Glacial Time

U-Th isochron ages of tufas formed on shorelines suggest that the last pluvial event in Lake Lahontan and Searles Lake was synchronous at about 16,500 cal yr B.P. (equivalent to a radiocarbon age of between 14,000 and 13,500 yr B.P.), whereas the timing of this pluvial event determined by radiocarbon dating is on the order of 1000 yr younger. The timing of seven distinct periods of near desiccation in Searles Lake during late-glacial time has been reinvestigated for U-Th age determination by mass spectrometry. U-Th dating of evaporite layers in the interbedded mud and salt unit called the Lower Salt in Searles Lake was hampered by the uncertainty in assessing the initial 230Th/232Th of the samples. The resulting ages, corrected by a conservative range of initial 230Th/232Th ratios, suggest close correlation of the abrupt changes recorded in Greenland ice cores (Dansgaard-Oeschger events) and wet–dry conditions in Searles Lake between 35,000 and 24,000 cal yr B.P.

The Neolithic in The Cambridgeshire Fens

Antiquity ◽  
1962 ◽  
Vol 36 (141) ◽  
pp. 10-23 ◽  
Author(s):  
J. G. D. Clark ◽  
H. Godwin
Keyword(s):  
Bronze Age ◽  
Western Europe ◽  
Age Determination ◽  
Radiocarbon Dates ◽  
Cambridge University ◽  
Radiocarbon Age ◽  
Neolithic Culture ◽  
University Department ◽  
The University ◽  
North Western

By common consent the spread of Neolithic culture has been one of the first objectives of radiocarbon dating in north-western Europe. This is due primarily to the intrinsic historical importance of this process, but the fact that the inception of husbandry has left clear indicators in the palaeobotanical record means that decisive samples are readily available. In the present paper an account will first be given of the reinvestigation of the site on Peacock’s Farm, Shippea Hill, Cambridgeshire, a locality where in 1934 Neolithic pottery had been found stratified in a vertical sequence between Mesolithic and Early Bronze Age remains, each in deposits with fossil pollen. In view of the stratigraphical importance of the site it may be appropriate in this same context to review the radiocarbon dates for the inception of Neolithic culture in the British Isles as a whole. The excavations were undertaken during June, 1960, by the Cambridge University Department of Archaeology and Anthropology with the support of the Crowther-Beynon Fund. Samples were collected for pollen analysis and radiocarbon age determination and the laboratory work was carried out in the University Sub-department of Quaternary Research at Cambridge.

scholarly journals In situ cosmogenic ¹⁰Be in pyroxene with an application to surface exposure dating

2021 ◽  
Author(s):  
◽  
Julia Anne Collins
Keyword(s):  
New Zealand ◽  
Production Rate ◽  
Production Rates ◽  
New Production ◽  
Radiocarbon Age ◽  
Exposure Dating ◽  
Ice Surface ◽  
Cross Calibration ◽  
Exposure Ages

<p>Cosmogenic nuclides are an important tool in quantifying many Earth-surface processes. Beryllium-10 (¹⁰Be) is commonly extracted out of the mineral quartz; however many landscapes lack quartz bearing rocks. In order to establish a new chronometer based on ¹⁰Be in pyroxene for use in New Zealand and Antarctica, it is necessary to verify cleaning protocols and determine a local production rate. In this study, I have tested and modified an existing pyroxene decontamination procedure in order to further develop the use of ¹⁰Be in pyroxene as a chronometer. This method successfully removes the meteoric component of ¹⁰Be in pyroxene, allowing only the concentration of in situ produced ¹⁰Be to be measured. Additionally, production rates for ¹⁰Be in pyroxene have been determined empirically for New Zealand using cross-calibration with measured ³He concentrations and an independent radiocarbon age of the Murimotu debris avalanche in the central North Island, New Zealand of 10.6 ± 1.1 ka. Theoretical ¹⁰Be pyroxene production rates were also determined, based on the composition of the Murimotu pyroxene. The best estimate for the 10Be pyroxene production rate is 3.4 ± 0.8 atoms g⁻¹ yr⁻¹ at sea-level high latitude, which was determined via cross-calibration with the radiocarbon age for the deposit. This work shows that production rates for ¹⁰Be in pyroxene are both empirically and theoretically 8-27% lower than in quartz. The ³He/¹⁰Be ratio in the Murimotu pyroxene is 34.5 ± 9.9; this is indistinguishable from global ³He-pyroxene/¹⁰Be-quartz production ratios.  In a case study surface exposure ages were determined for bedrock samples and cobble erratics collected in a vertical transect on Mount Gran, Antarctica, by applying the aforementioned ¹⁰Be pyroxene decontamination procedure and radiocarbon derived production rates. A chronology for ice surface lowering was obtained for the adjacent Mackay Glacier, indicating the ice surface lowered approximately 60 m during a relatively rapid episode of thinning which occurred between ~13.5 ka and 11 ka.  This thesis presents a successful test of decontamination procedures, new production rates, and an example application, showing the promise of ¹⁰Be in pyroxene as a chronometer. The development of ¹⁰Be in pyroxene allows environments without quartz-bearing rocks to be dated using this widely used nuclide. The pairing of ¹⁰Be with ³He in pyroxene would allow complex exposure histories to be determined, expanding the application.</p>

scholarly journals Further Attempts at Dating the Palynological Sequence of the Hula L07 Core, Upper Jordan Valley, Israel

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 561-570 ◽  
Author(s):  
M Weinstein-Evron ◽  
J C Vogel ◽  
J Kronfeld
Keyword(s):  
Soil Ph ◽  
Organic Material ◽  
Age Determination ◽  
Jordan Valley ◽  
Radiocarbon Age ◽  
Uranium Series ◽  
The Core ◽  
Acid Leach ◽  
Total Digestion ◽  
Carbonate Material

The palynological sequence of the Hula L07 core was previously correlated with the global oxygen isotope stages 3–5, based on a radiocarbon age determination and comparison with other Levantine paleoclimatological curves. An attempt was made to validate this correlation with Th/U dating. Unlike typical European peat, which is acidic, the soil pH of the Hula peat is mildly basic. Not only does this contribute to the oxidation of palynomorphs, but it also helps to preserve the carbonate material that can be a variable mixture of allogenic, endogenic, and authigenic components. Each component may represent a different degree of uranium series disequilibrium. The thorium (232Th) concentrations of the carbonate are low. Total digestion or acid leach of the sample may not always enable the proper correction for initial thorium. The dating derived from a NaOH-extraction of the organic material, while giving apparently better ages, also suffers from the presence of the carbonate admixture. It appears that, while 14C dating can be considered suitable for the younger portions of the core, techniques based upon the U-series may not be as efficacious in dating this important record of climatic change.

scholarly journals Environmental Influences on Dietary Carbon and 14C Ages in Modern Rats and Other Species

Radiocarbon ◽  
2001 ◽  
Vol 43 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Nancy R Beavan-Athfield ◽  
Bruce G McFadgen ◽  
Rodger J Sparks
Keyword(s):  
New Zealand ◽  
Food Web ◽  
Aquatic Plants ◽  
Food Chain ◽  
Rattus Norvegicus ◽  
Volcanic Zone ◽  
Norway Rat ◽  
Radiocarbon Age ◽  
The North ◽  
Lake Waters

Diet can play a significant role in anomalous radiocarbon ages derived from bone and other tissues when the food web incorporates depleted 14C reservoirs, such as the marine environment. Dietary effects from a post-bomb carbon variation have also been found in modern invertebrates and populations of Rattus exulans (Beavan and Sparks 1998). We now present the effect on absolute percent modern (pMC) and the conventional radiocarbon age (CRA) of a modern aquatic/terrestrial food web in a volcanic zone of the North Island, New Zealand. At Lake Taupo, geothermal venting transfers 14C depleted carbon to lake waters, which aquatic plants fix into the food chain; depleted 14C is shown to then pass on to shellfish, waterfowl, and Norway rat (Rattus norvegicus). The geothermally induced 14C variations from modern atmospheric pMC and CRA can increase apparent 14C ages by >2000 years.

scholarly journals Ages of Charcoal Samples of Geomorphologic Interest in Northeast Hungary

Radiocarbon ◽  
1980 ◽  
Vol 22 (3) ◽  
pp. 774-777 ◽  
Author(s):  
Eva Csongor ◽  
Zoltán Borsy ◽  
Ilona Szabô
Keyword(s):  
Sand Dune ◽  
Soil Layer ◽  
Age Determination ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Radiocarbon Age ◽  
Fossil Soil ◽  
Hungarian Plain ◽  
The Last Glacial

There are extended wind-blown sand territories in the northeastern part of the Great Hungarian Plain. Wind-blown sand migration periods were distineuished by means of radiocarbon age determination of charcoal samples found in the same type of a thin soil layer of chernozem character in different sand dune exposures. The ages of the samples were determined by proportional counter, and are around 12 000 years BP. This thin fossil soil layer, which is regionally spread in the northeast Hungarian wind-blown sand areas, presents a chronological mark between the blown sand forms evolved in the last glacial period and in the Holocene.

Radiocarbon Dating of Quaternary Loess Deposits, Banks Peninsula, Canterbury, New Zealand

1977 ◽  
Vol 7 (2) ◽  
pp. 177-196 ◽  
Author(s):  
K.M. Goh ◽  
B.P.J. Molloy ◽  
T.A. Rafter
Keyword(s):  
Organic Matter ◽  
New Zealand ◽  
Late Glacial ◽  
Radiocarbon Age ◽  
Chemical Treatments ◽  
Before And After ◽  
Loess Deposits ◽  
Physical And Chemical ◽  
Apparent Conflict

Quaternary loess deposits containing charcoal and in situ organic matter constituents from Banks Peninsula, New Zealand, were subjected to various physical and chemical treatments before radiocarbon assay. A stepwide procedure was used in which each component was radiocarbon dated before and after the treatments were applied. The criterion adopted for judging the effectiveness of a treatment is an increase in the radiocarbon age of loess layer. On this basis the oldest and therefore the most reliable date was obtained from the intra-loess charcoal and its humic acid extract. By comparison, the radiocarbon ages of organic matter constituents of the whole or partitioned loess were much younger, and are considered to represent only average ages for the particular layers concerned. No advantage was gained by dating the carbon-enriched clay-humus fraction as opposed to whole loess samples. There is an apparent conflict between our dates and current interpretation of loess stratigraphy and chronology in the South Island of New Zealand, which requires further investigation. This uncertainty apart, the upper layers of multiple loess deposits are clearly much older than earlier reports indicate, and it follows that the correlation of these deposits with late-glacial events both within and beyond New Zealand is even more tenuous and unreliable than previously thought to be the case.

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