Long‐Term Landscape Evolution of the Northparkes Region of the Lachlan Fold Belt, Australia: Constraints from Fission Track and Paleomagnetic Data

2000 ◽  
Vol 108 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Paul B. O'Sullivan ◽  
David L. Gibson ◽  
Barry P. Kohn ◽  
Brad Pillans ◽  
Colin F. Pain
Keyword(s):  
Fission Track ◽  
Landscape Evolution ◽  
Paleomagnetic Data ◽  
Fold Belt ◽  
Lachlan Fold Belt

Long‐Term Landscape Evolution of the Northparkes Region of the Lachlan Fold Belt, Australia: Constraints from Fission Track and Paleomagnetic Data: A Reply

2000 ◽  
Vol 108 (6) ◽  
pp. 750-752
Author(s):  
Paul B. O'Sullivan ◽  
Brad Pillans ◽  
David L. Gibson ◽  
Barry P. Kohn ◽  
Colin F. Pain
Keyword(s):  
Fission Track ◽  
Landscape Evolution ◽  
Paleomagnetic Data ◽  
Fold Belt ◽  
Lachlan Fold Belt

scholarly journals Using Fission-Track Radiography Coupled with Scanning Electron Microscopy for Efficient Identification of Solid-Phase Uranium Mineralogy at a Former Uranium Pilot Mill (Grand Junction, Colorado)

Geosciences ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 294
Author(s):  
Raymond H. Johnson ◽  
Susan M. Hall ◽  
Aaron D. Tigar
Keyword(s):  
Fission Track ◽  
Solid Phase ◽  
Nuclear Research ◽  
Thin Sections ◽  
Nuclear Research Reactor ◽  
Elemental Data ◽  
Individual Grains ◽  
Scanning Electron ◽  
Section Sample

At a former uranium pilot mill in Grand Junction, Colorado, mine tailings and some subpile sediments were excavated to various depths to meet surface radiological standards, but residual solid-phase uranium below these excavation depths still occurs at concentrations above background. The combination of fission-track radiography and scanning electron microscope energy-dispersive X-ray spectroscopy (SEM-EDS) provides a uniquely efficient and quantitative way of determining mineralogic associations of uranium that can influence uranium mobility. After the creation of sample thin sections, a mica sheet is placed on those thin sections and irradiated in a nuclear research reactor. Decay of the irradiated uranium creates fission tracks that can be viewed with a microscope. The fission-track radiography images indicate thin section sample areas with elevated uranium that are focus areas for SEM-EDS work. EDS spectra provide quantitative elemental data that indicate the mineralogy of individual grains or grain coatings associated with the fission-track identification of elevated uranium. For the site in this study, the results indicated that uranium occurred (1) with coatings of aluminum–silicon (Al/Si) gel and gypsum, (2) dispersed in the unsaturated zone associated with evaporite-type salts, and (3) sorbed onto organic carbon. The Al/Si gel likely formed when low-pH waters were precipitated during calcite buffering, which in turn retained or precipitated trace amounts of Fe, As, U, V, Ca, and S. Understanding these mechanisms can help guide future laboratory and field-scale efforts in determining long-term uranium release rates to groundwater.

scholarly journals Evidence for hybridisation in the Tynong Province granitoids, Lachlan Fold Belt, eastern Australia

2016 ◽  
Vol 63 (3) ◽  
pp. 235-255 ◽  
Author(s):  
K. R. Regmi ◽  
R. F. Weinberg ◽  
I. A. Nicholls ◽  
R. Maas ◽  
M. Raveggi
Keyword(s):  
Fold Belt ◽  
Eastern Australia ◽  
Lachlan Fold Belt

Morphology and long-term landscape evolution of the South African plateau in South Namibia

CATENA ◽  
2016 ◽  
Vol 142 ◽  
pp. 47-65 ◽  
Author(s):  
François Mvondo Owono ◽  
Marie-Joseph Ntamak-Nida ◽  
Olivier Dauteuil ◽  
François Guillocheau ◽  
Bernard Njom
Keyword(s):  
South African ◽  
Landscape Evolution ◽  
The South
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