Radioisotopes in the Diabase Sill (Upper Precambrian) at Bass Rapids, Grand Canyon, Arizona: An Application and Test of the Isochron Dating Method | The Institute for Creation Research
 
Radioisotopes in the Diabase Sill (Upper Precambrian) at Bass Rapids, Grand Canyon, Arizona: An Application and Test of the Isochron Dating Method

Download PDFDownload Radioisotopes in the Diabase Sill (Upper Precambrian) at Bass Rapids, Grand Canyon, Arizona: An Application and Test of the Isochron Dating Method PDF

by Andrew A. Snelling, Ph.D., Steven A. Austin, Ph.D., and William A. Hoesch, M.S.

Presented at the Fifth International Conference on Creationism, Pittsburgh, Pennsylvania, August 4–9, 2003. Published in: Proceedings of the Fifth International Conference on Creationism, R. L. Ivey (Ed.), pp. 269–284, 2003.

© 2003 Creation Science Fellowship, Inc., Pittsburgh, PA, USA. Published with permission. All rights reserved.

Abstract

The five-point Rb-Sr whole-rock isochron age of 1.07 Ga for the diabase sill at Bass Rapids, Grand Canyon, has been regarded for 20 years as an excellent example of the application of conventional radioisotopic dating. Initial thorough isotopic mixing within the sill is ideal for yielding concordant whole-rock isochron and mineral isochron ages. However, our new K-Ar, Rb-Sr, Sm-Nd, and Pb-Pb radioisotope data from 11 whole-rock samples (eight diabase, three granophyre) and six mineral phases separated from one of the whole-rock diabase samples yield discordant whole-rock and mineral isochron “ages.” These isochron “ages” range from 841.5±164 Ma (whole-rock K-Ar) to 1375±170 Ma (mineral Sm-Nd). Although significant discordance exists between the K-Ar, Rb-Sr, Sm-Nd, and Pb-Pb radioisotope methods, each method appears to yield concordant “ages” internally between whole rocks and minerals. Internal concordance is best illustrated by the Rb-Sr whole rock and mineral isochron “ages” of 1055±46 Ma and 1059±48 Ma, respectively. It is therefore argued that only changing radioisotope decay rates in the past could account for these discordant isochron “ages” for the same geologic event. Furthermore, these data are consistent with alpha decay having been accelerated more than beta decay, and with the longer the present halflife the greater being the acceleration factor.

Keywords

Diabase, Sill, Grand Canyon, Potassium-Argon, Rubidium-Strontium, Samarium-Neodymium, Lead-Lead, Radioisotopic Dating, Model Ages, Whole-Rock Isochron Ages, Mineral Isochron Ages, Discordance, Decay Constants, Accelerated Decay

For Full Text

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

The Latest
NEWS
Spinosaurus Swam! How a Swimming Spinosaurus Fits Scripture
Spinosaurus aegyptiacus had a longer body than the enormous T. rex. In Nature journal, researchers published a new reconstruction of the extinct reptile’s...

NEWS
Jungle Crickets Use Sophisticated Design to Avoid Bats
One hundred percent effective. How often does that happen, especially in the dog-eat-dog world of biology? Researchers from the University of Bristol in...

NEWS
T. rex Had Legs Designed for Walking
A new study published in the journal PLOS ONE has found that T. rex had legs made more for walking, rather than running.1 Their long legs were...

NEWS
Maple Syrup, Gold Nanoparticles, and Gratitude
It’s springtime in New England—an important season for maple syrup production. The maple syrup season is short, only lasting between four...

NEWS
A Day to Remember
"And this day shall be unto you for a memorial; and ye shall keep it a feast to the LORD throughout your generations; ye shall keep it a feast...

NEWS
Physics Today Article Ignores Monster Milankovitch Problem
An overview of the Milankovitch (or astronomical) ice age theory appears in the May 2020 issue of Physics Today.1 This theory (hypothesis, really)...

COVID-19
Pandemic Lockdown Result of Bad Software
One of the most frustrating things a person can go through is for their normally stable computer system, tablet, or phone, to suddenly stop working—a...

NEWS
Lone Scotland Tree Survived Deadly “Elm Disease”
One lone elm tree survived a deadly “elm disease.” Nicknamed “Ent Tree” (alluding to arboreal heroes in J. R. R. Tolkien’s...

NEWS
Finding Hope in Flooding
On the morning of May 19, 2020, the Governor of Michigan, Gretchen Whitmer, declared a state of emergency for Midland County after two dams broke from...

NEWS
World’s Largest Volcano Found Hiding Under the Ocean
A new study published in Earth and Planetary Science Letters has determined that Pūhāhonu volcano is the world’s largest by volume and the hottest.1...