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
Human Genome 20th Anniversary—Junk DNA Hits the Trash
The first rough drafts of the human genome were reported in 2001 (one in the private sector and one in the public sector).1-2 Since then, after...

NEWS
Bacterial Proteins Use Quantum Mechanics
Researchers have found a dimmer switch inside a protein. It tunes the protein’s configuration to take advantage of quantum mechanics during photosynthesis....

NEWS
Dr. Bill Cooper, ICR’s Adjunct Professor, Now in Glory
Earlier last month on March the 9th, Dr. William R. Cooper, ICR’s Master Faculty (known to ICR-SOBA’s faculty as “Dr. Bill” since...

NEWS
Inside April 2021 Acts & Facts
How will ICR expand biblical creation education this year? How do fossilized fish and land creatures confirm Genesis history? Does recent research support...

ACTS & FACTS
Creation Kids: Bees
You’re never too young to be a creation scientist! Kids, discover fun facts about God’s creation with ICR’s special Creation Kids learning...

ACTS & FACTS
Pleasure in Our Purpose
Eric Liddell was one of the most famous athletes of the 20th century and perhaps the greatest that Scotland ever produced. An international rugby player,...

APOLOGETICS
Beware Sinkholes and Other Failing Foundations
The sudden falling of some Christian schools can be compared to tiankengs, the geological term used for sinkholes that are at least 300 feet deep.1,2...

ACTS & FACTS
The Painted Desert: Fossils in Flooded Mud Flats
Brian Thomas, Ph.D., and Tim Clarey, Ph.D. The Painted Desert stretches across 120 miles of northern Arizona. Its sedimentary rocks show bright...

ACTS & FACTS
Does Recent Research Support Human Evolution?
In 1997, the Institute for Creation Research ran an Acts & Facts article on the lack of compelling evidence regarding our supposed evolution from...

ACTS & FACTS
Building a Perfectly Optimal Flying Machine
For thousands of years, people have dreamed of flying because they witnessed birds and knew it was possible. Inspired by a study of birds, the Wright...