ISOTOPE SUPPORT. “Support for this idea can also be found in the ratio of strontium isotopes. Strontium-87 mainly makes it into the ocean through the breakdown of continental rocks, whereas strontium-86 comes from mid-ocean ridges. The high point for strontium-87 over the past 900 million years occurred during the Cambrian, suggesting weathering peaked around then. The ratio of neodymium-143 to neodymium-144 (also known as εNd) also helps out by indicating the age of those continental rocks being weathered. Around the time that strontium-87 peaked, εNd hit a low point as continental weathering cut into older and older rocks.’
https://lnkd.in/dtYSB5v
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022