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
RNA Ties and Unties Itself
There are two types of nucleic acids (genetic molecules): DNA and RNA. DNA (deoxyribonucleic acid) is a large linear molecule designed to store genetic...

NEWS
Does Oddball Platypus Genome Reveal Its Origins?
How in the world did a creature as odd as the duck-billed platypus originate? This creature lays eggs like a reptile, has venom like a reptile, spurs like...

NEWS
Is Evolution ‘Fake Science’?
The organization BioLogos, which advocates that Christians accept secular evolutionary claims, recently published an online essay entitled “How to...

NEWS
Cambrian Explosion Alive and Well
A new editorial in GSA Today is claiming that secular scientists should cease using the term “Cambrian Explosion.”1 It’s not...

NEWS
Abraham Ate Bananas?
Since the word banana does not occur in Scripture, any evidence of bananas in ancient Middle Eastern diets would have to come from the ground. New research...

NEWS
3-D Human Genome Radically Different from Chimp
All plant and animal genomes studied so far exhibit complex and distinct three-dimensional (3-D) structures in their chromosome configurations depending...

NEWS
Amazonian Artwork and the Post-Flood Ice Age
An extensive series of South American Ice Age artwork may be of interest to biblical creationists. In 2017 and 2018, scientists discovered a nearly eight-mile-long...

ACTS & FACTS
Creation Kids: Dinosaurs
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...

NEWS
Inside January 2021 Acts & Facts
How is ICR winning science and scientists back to Christ? What is the significance of fossil bone collagen discoveries? Did pterosaurs have feathers?...

ACTS & FACTS
Savvy Sons of Light
Many Christians grow uncomfortable when their pastor teaches about money. If it’s any consolation, I know many pastors who feel the same way....