Results 121 to 130 of about 397 (177)

Apatite fission track and (U-Th)/He data from Fennoscandia: An example of underestimation of fission track annealing in apatite

Earth and Planetary Science Letters, 2005
Abstract Apatite fission track (AFT) data from cratons have commonly been interpreted in terms of major episodes of sedimentary burial and subsequent denudation, often in the absence of any remnant sedimentary rocks or other supporting geological evidence. Reconciling these interpretations with geologically documented denudation events or outcropping
B.W.H. Hendriks, T.F. Redfield
exaly   +2 more sources

Apatite fission-track chronometry using laser ablation ICP-MS

Chemical Geology, 2004
Abstract Comparison is made of apatite fission-track (FT) ages measured by using conventional thermal neutron irradiation and Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) to determine sample uranium content. Spontaneous track densities were determined on specified apatite grains from the Durango, Fish Canyon Tuff, and Mount
Jocelyn Barbarand, Andrew Carter
exaly   +3 more sources

Improved modeling of fission-track annealing in apatite

American Mineralogist, 2007
Two abiding issues impact the reliability of apatite fission-track analysis and thermal history inversion in particular: reproducibility of track-length measurements and variability of annealing kinetics. In the companion to this paper, we addressed the first by demonstrating that using c -axis projection to normalize track lengths for ...
Richard A Ketcham, Andrew Carter, Jocelyn Barbarand   +2 more
exaly   +2 more sources

Reproducibility of apatite fission-track length data and thermal history reconstruction

Earth and Planetary Science Letters, 2009
The ability to derive detailed thermal history information from apatite fission-track analysis is predicated on the reliability of track length measurements. However, insufficient attention has been given to whether and how these measurements should be standardized.
Richard A Ketcham, Massimiliano Zattin
exaly   +4 more sources

Compositional and structural control of fission-track annealing in apatite

Chemical Geology, 2003
Geological cooling histories modelled from apatite fission-track (FT) data are dependent upon extrapolated, laboratory-based track annealing data. Annealing in apatite appears to be compositionally controlled. This study investigates how compositional variation influences apatite crystal structure (as reflected in the unit-cell parameters) and fission ...
Jocelyn Barbarand, Andrew Carter
exaly   +2 more sources

Fission track tectonics: The tectonic interpretation of fission track apatite ages

Earth and Planetary Science Letters, 1972
Abstract Absolute uplift rates, regional uplift patterns, and time limits for uplift and fault movements can be studied with fission tracks in apatite. This is demonstrated for about 50 apatites from the Swiss and Italian Alps. Due to the relatively low thermal stability of tracks in apatite, the fission track ages of apatites from this area define ...
G.A. Wagner, G.M. Reimer
openaire   +1 more source

Fission fragment tracks in apatite: recordable track lengths

Earth and Planetary Science Letters, 1971
Abstract This study is concerned with the measurements of total lengths of fission fragment tracks due to spontaneous fission of238U (fossil tracks) and neutron induced fission of235U (n-induced tracks) in several terrestrial apatites of geological age exceeding 0.4 billion years. The measurements of total etchable lengths are based on the revelation
N. Bhandari, S.G. Bhat, D. Lal, G. Rajagopalan, A.S. Tamhane, V.S. Venkatavaradan   +5 more
openaire   +1 more source

Optical studies of fission tracks in apatite

Nuclear Tracks and Radiation Measurements (1982), 1984
Abstract Fossil fission track damage in natural fluorapatite has been studied by absorption spectroscopy. It was found that for samples cut perpendicular to the c-axis, the dominant annealing process for the absorbing defects (identified as H(II) centers) is, in the early stage of annealing, diffusion to the sample surface with a measured diffusion ...
W. Ritter, T.D. Märk
openaire   +1 more source

Fission-Track-Alter von Durango-Apatit, Mexiko

Contributions to Mineralogy and Petrology, 1971
Spontaneous and induced fission tracks in apatite were revealed by etching with HNO3 and used for fission track dating. The fission track age of specimens known as Durango-Apatite was found to be (36.3±3.5) · 106 a.
Märk, Elmar, Pahl, Max, Märk, Tilmann D.   +2 more
openaire   +1 more source

Fission track annealing in apatite and sphene

Journal of Geophysical Research, 1969
Study of the annealing characteristics of fission tracks in sphene and fluorapatite shows that all tracks will be annealed out in 1 hour at 350°C for fluorapatite and 625°C for sphene. Extrapolation of the experimentally determined annealing temperatures suggest that all tracks will disappear in 106 years as 170°C for fluorapatite and 420°C for sphene.
C. W. Naeser, H. Faul
openaire   +1 more source