The Failure of U-Th-Pb "Dating"; at Koongarra, Australia

Download PDFDownload The Failure of U-Th-Pb "Dating"; at Koongarra, Australia PDF

Published in: CEN Technical Journal, volume 9, number 1, pp. 71–92, 1995.

© 1995 Answers in Genesis A. C. N. 010 120 304. All Rights Reserved.

Abstract

As with other radiometric “dating” methods, the U-Pb and Pb-Pb isochron methods have been questioned in the open literature, because often an excellent line of best fit between ratios obtained from a set of good cogenetic samples gives a resultant “isochron” and yields a derived “age” that has no geological meaning. At the Koongarra uranium deposit, Australia, there is ample evidence of open system behavior, or repeated migration, of U and Pb—ore textures, mineral chemistry, supergene alteration, uranium/daughter disequilibrium, and groundwater and soil geochemistry. Yet U-Th-Pb isotopic studies of the uranium ore, host rocks, and soils have produced an array of false “isochrons” that yield “ages” which are geologically meaningless. Even a claimed near-concordant U-Pb “age” of 862 Ma (million years) on one uraninite grain is identical to a false Pb-Pb isochron “age,” but neither can be connected to any geological event. The open system behavior of the U-Th-Pb system is clearly the norm, as is the resultant mixing of radiogenic Pb with “common” or background Pb, even in soils in the surrounding region, apparently even up to 17 km away! Because no geologically meaningful results can be interpreted from the U-Th-Pb data at Koongarra (three uraninite grains even yield a 232Th/208Pb “age” of 0 Ma), serious questions must be asked about the validity of the fundamental/foundational basis of the U-Th-Pb “dating” method. This makes the task of creationists building their model for the geological record much easier, since claims of U-Th-Pb radiometric “dating” having “proven” the claimed great antiquity of the earth, its strata and fossils can be justifiably ignored.

Keywords

Radiometric Dating, U-Pb and Pb-Pb Isochron Methods, Koongarra, Uranium Deposit, Open-System Behavior, Ore Textures, Mineral Chemistry, Supergene Alteration, Uranium-Daughter Disequilibrium, Groundwater and Soil Geochemistry, Uraninites, Galenas, False Isochrons, Mixing, Zero “Ages”

For Full Text

Please see the Download PDF link above for the entire article.

The Latest
NEWS
"Ancient" Fossil Still Has Hagfish Slime Residue
Hagfish look creepy. They can act creepy, too. Having no bones, they tie themselves into sliding figure eight knots that help them tear mouthfuls of...

CREATION PODCAST
What Do We Do With Darwin Day?
Many secularist and humanist organizations celebrate February 12 as Darwin Day, a day set aside to honor Charles Darwin and his legacy. But is Darwinism...

NEWS
Meteorite Impact Observed During Lunar Eclipse
On January 21, 2019, during a total lunar eclipse, astronomers and amateur stargazers alike saw a small meteorite strike the lunar surface.1 The collision...

NEWS
Revealing Our Fossil Wall
It was an exciting week here at ICR as we watched workers carefully mount nine fossil replicas to the Discovery Center’s exterior wall. Each 12ˈ×12ˈ...

NEWS
Red Algae Lazarus Effect Can't Resurrect Evolution
Jeffrey P. Tomkins, Ph.D. and Timothy L. Clarey, Ph.D. Red algae form one of the main components of coral reefs and were originally thought to have...