Desert varnish: potential for age dating via uranium-series isotopes
Trace metals and natural radioisotopes are measured in an unusually thick and presumed ancient desert varnish from the Colorado Plateau in Utah. Uranium and thorium concentrations in the sequence: varnish--altered rind--heartrock (Shinarump formation sandstone) indicate that uranium with little accompanying thorium is derived from external sources. The varnish forms a closed system for /sup 230/Th and /sup 231/Pa with equilibrium values for both /sup 230/Th//sup 234/U and /sup 231/Pa//sup 235/U. Selective leaching of the ferromanganese oxides followed by analysis of both the leachate and silicate residue is proposed to allow age determinations.
- Research Organization:
- Lawrence Livermore National Lab., CA
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6353928
- Journal Information:
- J. Geol.; (United States), Journal Name: J. Geol.; (United States) Vol. 88:1; ISSN JGEOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
ARID LANDS
COATINGS
DEPOSITS
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
PROTACTINIUM 231
PROTACTINIUM ISOTOPES
RADIOISOTOPES
ROCKS
THORIUM 230
THORIUM ISOTOPES
TRACE AMOUNTS
URANIUM 234
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
580100* -- Geology & Hydrology-- (-1989)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
ARID LANDS
COATINGS
DEPOSITS
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
PROTACTINIUM 231
PROTACTINIUM ISOTOPES
RADIOISOTOPES
ROCKS
THORIUM 230
THORIUM ISOTOPES
TRACE AMOUNTS
URANIUM 234
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES