Discordant Potassium-Argon Model and Isochron "Ages" for Cardenas Basalt (Middle Proterozoic) and Associated Diabase of Eastern Grand Canyon, Arizona | The Institute for Creation Research
 
Discordant Potassium-Argon Model and Isochron "Ages" for Cardenas Basalt (Middle Proterozoic) and Associated Diabase of Eastern Grand Canyon, Arizona

Download PDFDownload Discordant Potassium-Argon Model and Isochron "Ages" for Cardenas Basalt (Middle Proterozoic) and Associated Diabase of Eastern Grand Canyon, Arizona PDF

by Steven A. Austin, Ph.D. and Andrew A. Snelling, Ph.D.

Presented at the Fourth International Conference on Creationism, Pittsburgh, Pennsylvania, August 3–8, 1998. Published in: Proceedings of the Fourth International Conference on Creationism, R. E. Walsh (editor), pp. 35–51, 1998.

© 1998 Creation Science Fellowship, Inc., Pittsburgh, Pennyslvania, USA. All Rights Reserved.

Abstract

For more than twenty years it has been known that the Rb-Sr and K-Ar systems give discordant “ages” for Cardenas Basalt and associated Proterozoic diabase sills and dikes of Grand Canyon. Thirteen new K-Ar analyses of Proterozoic mafic rocks of Grand Canyon are added to nine published K-Ar analyses. We report a new fourteen-point K-Ar isochron “age” of 516 ± 30 Ma which is strongly discordant with the published Rb-Sr isochron “age” of 1.07 ± 0.07 Ga for Cardenas Basalt. By more than doubling the K-Ar data set we can test explanations for why the discordance exists. Advocates of the Rb-Sr isochron, recognizing the strong geochemical similarity of rubidium and potassium, have not argued for significant potassium addition to these rocks. Addition of potassium during alteration of these rocks would explain the anomously young K-Ar age, but it would also add rubidium and invalidate the Rb-Sr isochron age. Instead, advocates of the Rb-Sr isochron have argued only for significant argon loss. Two argon loss models (episodic loss and continuous loss) are tested in an attempt to explain why these altered rocks have about half the 40Ar required by the conventional Rb-Sr interpretation. Both argon loss models, although attempting to maintain the assumptions of conventional geochronology, fail to explain the data, especially the new data we offer. Three models are proposed as alternatives to argon loss models, but these invalidate using the K-Ar system as conventional geochronology would assume.

Keywords

Basalt, Diabase, Grand Canyon, Potassium-Argon Dating, Model “Ages”, Isochron “Ages”, Discordance, Argon Leakage Models, Inheritance, Mixing, Change of Decay

For Full Text

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

The Latest
NEWS
Irish Bacteria Could Stop Dangerous "Superbugs"
We’re all familiar with antibiotic resistance building in the human population.1 Antibiotics are widely prescribed, but many are largely...

CREATION PODCAST
Encouragement and Advice for Homeschool Families
Find encouragement and advice for your homeschooling journey as ICR Director of Communications Jayme Durant reflects on her 22 years of experience as...

NEWS
Prestonwood Christian Academy Previews ICR Discovery Center
On Tuesday, April 2, 2019, sixth graders from Prestonwood Christian Academy visited the ICR Discovery Center for Science and Earth History for a sneak...

NEWS
Dances with Cells
Cell biologists have long focused on the tiniest of interactions: those between molecules. Recently, some researchers have zoomed out just a little...

NEWS
Termite Nest Architectural Design Is Clearly Seen
Termites (order Isoptera) are eusocial—animals with an advanced social organization—insects that can number in the millions, producing something...