Potassium-argon dating method

2006 ◽  
pp. 522-525
Author(s):  
K. A. Foland
Keyword(s):  
Argon Dating ◽  
Dating Method

scholarly journals From the discovery of radioactivity to the development of the K-Ar dating method

2012 ◽  
Vol 39 (3) ◽  
pp. 158-166 ◽  
Author(s):  
Stanisław Hałas
Keyword(s):  
20Th Century ◽  
Argon Dating ◽  
Dating Method ◽  
Potassium 40

Abstract In this paper I try to explain why the potassium-argon dating method was developed much later than other radiometric methods (like U-He and U-Pb), which were established at the beginning of the 20th century. In fact the pioneering paper by Aldrich and Nier (1948) was published 50 years after the discovery of polonium and radium, when nearly all the details concerning potassium isotopes and radioactivity of potassium-40 had been investigated. The role of Marie Curie’s concept of the nature of radioactivity in the discovery of the radioactivity of potassium is emphasized.

The quest for an absolute chronology in human prehistory: anthropologists, chemists and the fluorine dating method in palaeoanthropology

2009 ◽  
Vol 42 (1) ◽  
pp. 95-114 ◽  
Author(s):  
MATTHEW R. GOODRUM ◽  
CORA OLSON
Keyword(s):  
Twentieth Century ◽  
Significant Advance ◽  
Prehistoric Archaeology ◽  
Fossil Bone ◽  
Argon Dating ◽  
Early Twentieth Century ◽  
Dating Methods ◽  
Absolute Dating ◽  
Dating Method

AbstractBy the early twentieth century there was a growing need within palaeoanthropology and prehistoric archaeology to find a way of dating fossils and artefacts in order to know the age of specific specimens, but more importantly to establish an absolute chronology for human prehistory. The radiocarbon and potassium–argon dating methods revolutionized palaeoanthropology during the last half of the twentieth century. However, prior to the invention of these methods there were attempts to devise chemical means of dating fossil bone. Collaborations between Emile Rivière and Adolphe Carnot in the 1890s led to the development of the fluorine dating method, but it was not until the 1940s that this method was improved and widely implemented by Kenneth Oakley to resolve a number of problems in palaeoanthropology, including the Piltdown Man controversy. The invention of the fluorine dating method marked a significant advance in the quest for absolute dating in palaeoanthropology, but it also highlights interesting problems and issues relating to the ability of palaeoanthropologists and chemists to bring together different skills and bodies of knowledge in order successfully to develop and apply the fluorine dating method.

Potassium Argon Dating

1966 ◽  
Author(s):  
O. A. Schaeffer ◽  
J. Zähringer
Keyword(s):  
Argon Dating

scholarly journals A Study about the Temporal Constraints on the Martian Yardangs’ Development in Medusae Fossae Formation

2021 ◽  
Vol 13 (7) ◽  
pp. 1316
Author(s):  
Jia Liu ◽  
Zongyu Yue ◽  
Kaichang Di ◽  
Sheng Gou ◽  
Shengli Niu
Keyword(s):  
Size Distribution ◽  
Indirect Method ◽  
Common Method ◽  
Planetary Surface ◽  
Temporal Constraints ◽  
History Of Development ◽  
Long Duration ◽  
History Of ◽  
Dating Method

The age of Mars yardangs is significant in studying their development and the evolution of paleoclimate conditions. For planetary surface or landforms, a common method for dating is based on the frequency and size distribution of all the superposed craters after they are formed. However, there is usually a long duration for the yardangs’ formation, and they will alter the superposed craters, making it impossible to give a reliable dating result with the method. An indirect method by analyzing the ages of the superposed layered ejecta was devised in the research. First, the layered ejecta that are superposed on and not altered by the yardangs are identified and mapped. Then, the ages of the layered ejecta are derived according to the crater frequency and size distribution on them. These ages indicate that the yardangs ceased development by these times, and the ages are valuable for studying the evolution of the yardangs. This indirect dating method was applied to the areas of Martian yardangs in the Medusae Fossae Formation (MFF). The ages of the selected six layered ejecta range from ~0.50 Ga to ~1.5 Ga, indicating that the evolution of the corresponding yardangs had been ceased before these times. Analysis of more layered ejecta craters and superposed yardangs implies that yardangs in the MFF have a long history of development and some yardangs are still in active development.

The determination of sedimentation rates in Lake Ontario using the 210Pb dating method

1978 ◽  
Vol 15 (3) ◽  
pp. 431-437 ◽  
Author(s):  
John G. Farmer
Keyword(s):  
Sedimentation Rate ◽  
Lake Ontario ◽  
Sedimentary Basins ◽  
210Pb Dating ◽  
Sedimentation Rates ◽  
Surface Mixing ◽  
Dating Method ◽  
210Pb Dating Method

The 210Pb dating method has been applied successfully to the determination of recent sedimentation rates at four sites distributed among the three major sedimentary basins (Niagara, Mississauga and Rochester) of Lake Ontario. Following correction for effects due to compaction of the sediments, mean sedimentation rates ranging from 0.02 cm/year at the periphery of the Mississauga basin to 0.11 cm/year in the Niagara and Rochester basins were determined. Allowance for compaction reduced the non-compaction-corrected sedimentation rates by 20–35%. Neither 210Pb nor fallout 137Cs profiles indicated surface mixing of sediment sufficient to noticeably affect the calculated sedimentation rates. At all four sites, the sedimentation rate seems to have remained constant during the last 100–150 years.

The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]

1965 ◽  
Vol 6 (4) ◽  
pp. 342-385 ◽  
Author(s):  
J. F. Evernden ◽  
G. H. Curtis ◽  
William Bishop ◽  
C. Loring Brace ◽  
J. Desmond Clark ◽  
...  
Keyword(s):  
East Africa ◽  
Late Cenozoic ◽  
Argon Dating

Progress on absolute dating of ice cores with Argon isotopes

2021 ◽  
Author(s):  
Anais Orsi ◽  
Ilaria Crotti ◽  
Roxanne Jacob ◽  
Amaelle Landais ◽  
Elise Fourré
Keyword(s):  
Ice Core ◽  
Ice Cores ◽  
Significant Advance ◽  
Large Sample Size ◽  
Argon Isotopes ◽  
Absolute Dating ◽  
Dating Method ◽  
A New Technique ◽  
Ice Core Dating ◽  
Key Parameter

<p>In the search for very old ice, finding the age of the ice is a key parameter necessary for its interpretation. Most ice core dating method are based on chronological markers that require the ice to be in stratigraphic order. However, the oldest ice is likely to be found at the bottom of ice sheets, where the stratigraphy is disturbed, or in ablation areas, where the classical methods cannot be used. Absolute dating techniques have recently been developed to provide new constraints on the age of old ice, but their development in the context of ice cores is limited by the large sample size required. Here, we discuss the analytical performances of a new technique for 40Ar dating, which allows us to provide a reliable age with 80g of ice rather than 800g, as previously published. We present an application to the dating of the bottom of the TALDICE and Dome C ice cores. This method represents a significant advance for its application to the very precious ice at the bottom of ice cores.</p>

scholarly journals An yttrium dating method for giant stars

Science ◽  
2017 ◽  
Vol 357 (6356) ◽  
pp. 1109.5-1110
Author(s):  
Keith T. Smith
Keyword(s):  
Giant Stars ◽  
Dating Method
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