University of Alberta scientists contend they have the answer to mass extinction of animals and plants 93 million years ago. The answer, research has uncovered, has been found at the bottom of the sea floor where lava fountains erupted, altering the chemistry of the sea and possibly of the atmosphere.
Earth and Atmospheric Science researchers Steven Turgeon and Robert Creaser found specific isotope levels of the element osmium, an indicator of volcanism in seawater, in black shale—rocks containing high amounts of organic matter—drilled off the coast of South America and in the mountains of central Italy.
According to their research, the eruptions preceded the mass extinction by a geological blink of the eye. The event occurred within 23 thousand years and the underwater volcanic eruption had two consequences: first, nutrients were released, which allowed mass feeding and growth of plants and animals.
When these organisms died, their decomposition and fall towards the sea floor caused further oxygen depletion, thereby compounding the effects of the volcanic eruption and release of clouds of carbon dioxide in to the oceans and atmosphere. The result was a global oceanic anoxic event, where the ocean is completely depleted of oxygen.
Anoxic events—while extremely rare—occur in periods of very warm climate, which means that this research could not only help prove a mass-extinction theory, but also help scientists studying the effects of global warming.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- How Zika Infects The Placenta
- Making Or Breaking Habits: The Endocannabinoids Can Do It
- Scientists Discover How Supermassive Black Holes Keep Galaxies Turned Off
- Music For The Eyes
- Genomic Study Tracks African-American Dispersal In The Great Migration
- Schrödinger's Cat Is Not Just Alive And Dead, He's Both In 2 Places At Once
- B0 Meson Lifetime Difference Measured By ATLAS
- "Yes, agreed, nice way of putting it. Though a rather interesting garage that's full of treasures..."
- "Oh, okay, sorry about that. Likewise for yourself. ..."
- "Four paragraphs in I hit delete. I'm just going to wish you the best in all things...."
- "Oh rightio. I should add something about that as background for those who haven't come across the..."
- "Okay. Read it. Liked about half The part I found most startling was the meaning of the phrase,..."