| 9076 |
Creator |
169f034520be3a0d0aff86e4441f6f0e |
| 9076 |
Creator |
ext-6c219a9a6efe243b5f396e585bd54a96 |
| 9076 |
Date |
2006-03 |
| 9076 |
Is Part Of |
repository |
| 9076 |
Is Part Of |
p00128252 |
| 9076 |
abstract |
Uranium-series (U-series) analyses are an essential component of many research projects
in Earth and environmental science, oceanography, hydrology and science-based archaeology.
Topics range from magma chamber evolution and volcanic hazard prediction, global climatic
change through dating of authigenic carbonate deposits, human evolution through dating
of bone, to the study of groundwater evolution. The U-series decay chains contain
many elements that can be fractionated in environmental and geological processes.
Half-lives of radioactive isotopes of such elements range from seconds to many millennia
and application depends on the natural timeframe of the process or the elapsed time.
This review will be limited to some aspects of the 238U–234U–230Th–226Ra system with
half-lives of 245 kyr, 76 kyr and 1.6 kyr, respectively.
In environmental systems, fractionation of uranium and thorium is a very efficient
process because thorium is extremely insoluble while hexavalent uranium in oxidising
conditions is relatively soluble. Many authigenic precipitates of calcite contain
virtually no thorium and inorganic precipitates have U/Ca ratios very similar to the
ratio of dissolved uranium and calcium. Almost no radiogenic 230Th in the precipitate
means that the radiogenic clock starts effectively at zero. However, pure authigenic
precipitates are rare and many contain some allogenic material, mostly silicate with
238U in secular equilibrium with significant 230Th. Some of the characteristics of
different types of samples and various methods to accommodate or correct for ‘inherited’
230Th will be discussed.
Authigenic material should remain a ‘closed system’ with respect to the relevant isotopes
but that requirement is sometimes difficult to maintain because radioactive decay
results in damage to the crystal lattice of the host mineral. Consequences of this
‘recoil effect’ and correction schemes will be discussed. Dating archaeological bone
based on the systematics of diffusion and adsorption to effectively model ‘open system’
behaviour is also included. |
| 9076 |
authorList |
authors |
| 9076 |
issue |
1-4 |
| 9076 |
status |
peerReviewed |
| 9076 |
volume |
75 |
| 9076 |
type |
AcademicArticle |
| 9076 |
type |
Article |
| 9076 |
label |
van Calsteren, P. and Thomas, L. (2006). Uranium-series dating applications in
natural environmental science. Earth Science Reviews, 75(1-4) pp. 155–175. |
| 9076 |
label |
van Calsteren, P. and Thomas, L. (2006). Uranium-series dating applications in natural
environmental science. Earth Science Reviews, 75(1-4) pp. 155–175. |
| 9076 |
Title |
Uranium-series dating applications in natural environmental science |
| 9076 |
in dataset |
oro |