Starship Asterisk*

APOD Robot wrote: ↑Sat May 25, 2024 4:07 am Orbiting 400 kilometers above Quebec, Canada, planet Earth, the International Space Station Expedition 59 crew captured this snapshot of the broad St. Lawrence River and curiously circular Lake Manicouagan on April 11.

APOD Robot wrote: ↑Sat May 25, 2024 4:07 am Manicouagan Impact Crater from Space

Rauf wrote: ↑Sat May 25, 2024 6:04 am

APOD Robot wrote: ↑Sat May 25, 2024 4:07 am Orbiting 400 kilometers above Quebec, Canada, planet Earth, the International Space Station Expedition 59 crew captured this snapshot of the broad St. Lawrence River and curiously circular Lake Manicouagan on April 11.

April 11? Which one? I guess the one in 2019?

Roy wrote: ↑Sat May 25, 2024 2:11 pm Lots of interesting questions arise! How accurate are age estimates? The text says 215 million years, 1 million years plus or minus, so cannot have caused Triassic-Jurassic die-off at 201 million years. Percentage of error possible at that remove, for each estimate?
Also, where was Quebec back then? Continents move.
Fossil remains in the area discovered?
Inquiring minds want to know.

Chris Peterson wrote: ↑Sat May 25, 2024 2:32 pm

Roy wrote: ↑Sat May 25, 2024 2:11 pm Lots of interesting questions arise! How accurate are age estimates? The text says 215 million years, 1 million years plus or minus, so cannot have caused Triassic-Jurassic die-off at 201 million years. Percentage of error possible at that remove, for each estimate?
Also, where was Quebec back then? Continents move.
Fossil remains in the area discovered?
Inquiring minds want to know.

This occurred when there was only one landmass on Earth, Pangea. The area that became Quebec was at a lower latitude, probably not far north of the tropics.

The radiometric dating methods used to determine the age of the event are very well developed, so the 215 million year determination is almost certainly quite close. I don't think anybody considers the impact to have been the cause of that extinction event, although its climatic impact may have been contributory.

Wikipedia wrote:

The Siberian Traps (Russian: Сибирские траппы, romanized: Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive eruptive event that formed the traps is one of the largest known volcanic events in the last 500 million years.

The eruptions continued for roughly two million years and spanned the Permian–Triassic boundary, or P–T boundary, which occurred around 251.9 million years ago. The Siberian Traps are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record.

Ann wrote: ↑Sat May 25, 2024 5:10 pm

Chris Peterson wrote: ↑Sat May 25, 2024 2:32 pm

Roy wrote: ↑Sat May 25, 2024 2:11 pm Lots of interesting questions arise! How accurate are age estimates? The text says 215 million years, 1 million years plus or minus, so cannot have caused Triassic-Jurassic die-off at 201 million years. Percentage of error possible at that remove, for each estimate?
Also, where was Quebec back then? Continents move.
Fossil remains in the area discovered?
Inquiring minds want to know.

This occurred when there was only one landmass on Earth, Pangea. The area that became Quebec was at a lower latitude, probably not far north of the tropics.

The radiometric dating methods used to determine the age of the event are very well developed, so the 215 million year determination is almost certainly quite close. I don't think anybody considers the impact to have been the cause of that extinction event, although its climatic impact may have been contributory.

The Siberian Traps, I'm just saying!!!

...

Wikipedia wrote:

The Siberian Traps (Russian: Сибирские траппы, romanized: Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive eruptive event that formed the traps is one of the largest known volcanic events in the last 500 million years.

The eruptions continued for roughly two million years and spanned the Permian–Triassic boundary, or P–T boundary, which occurred around 251.9 million years ago. The Siberian Traps are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record.

I think I've heard that this enormously prolonged series of volcanic eruptions had something to do with the breaking up of with the super-continent Pangea and/or with the Indian tectonic plate colliding with the Russian plate.

So the Permian–Triassic extinction event happened before the impact event that formed Lake Manicouagan. Well, whatever, the formation of that lake by a falling rock (albeit a large one) is probably not at all comparable to the Earth turning itself inside out to spew red-hot lava and enormous amounts of carbon dioxide into the air for two million years over an area of seven million square kilometers.

Ann

https://www.livescience.com/yellowstone-caldera-supervolcano-eruption wrote:
Is the Yellowstone supervolcano really 'due' for an eruption?

Yellowstone's supervolcano last erupted 70,000 years ago. Will it erupt again anytime soon?

Beneath Yellowstone National Park, a vast region of spectacular wilderness visited by around 3 million people annually, lurks one of the largest volcanoes in the world.

The Yellowstone Caldera — the cauldron-like basin at the summit of the volcano — is so colossal that it is often called a "supervolcano," which, according to the Natural History Museum in London, means it has the capacity to "produce a magnitude-eight eruption on the Volcanic Explosivity Index, discharging more than 1,000 cubic kilometers [240 cubic miles] of material."

To put that into perspective, the 1991 eruption of Pinatubo in the Philippines, arguably the most powerful volcanic eruption in living memory, was rated a 6 on the Volcanic Explosivity Index, making it, according to the Natural History Museum, "around 100 times smaller than the benchmark for a supervolcano."

So should we be worried? Will Yellowstone erupt anytime soon?
...

Is Yellowstone "due" for an eruption?

Media reports have often claimed that Yellowstone is due to erupt. They claim that because the last eruption of the supervolcano was 70,000 years ago, it's bound to blow soon. But that's not how volcanoes work.

"This is perhaps the most common misconception about Yellowstone, and about volcanoes in general. Volcanoes don't work on timelines," Michael Poland, a geophysicist and the scientist-in-charge at Yellowstone Volcano Observatory, told Live Science in an email. "They erupt when there is enough eruptible magma beneath the surface, and pressure to cause that magma to ascend.

"Neither condition is in place at Yellowstone right now," he added. "It's all about that magma supply. Cut that off, and the volcano won't erupt."

Ann wrote: ↑Sat May 25, 2024 5:10 pm

Chris Peterson wrote: ↑Sat May 25, 2024 2:32 pm

Roy wrote: ↑Sat May 25, 2024 2:11 pm Lots of interesting questions arise! How accurate are age estimates? The text says 215 million years, 1 million years plus or minus, so cannot have caused Triassic-Jurassic die-off at 201 million years. Percentage of error possible at that remove, for each estimate?
Also, where was Quebec back then? Continents move.
Fossil remains in the area discovered?
Inquiring minds want to know.

This occurred when there was only one landmass on Earth, Pangea. The area that became Quebec was at a lower latitude, probably not far north of the tropics.

The radiometric dating methods used to determine the age of the event are very well developed, so the 215 million year determination is almost certainly quite close. I don't think anybody considers the impact to have been the cause of that extinction event, although its climatic impact may have been contributory.

The Siberian Traps, I'm just saying!!!

The extent of the Siberian Traps. Credit: Derivative work: Jo (talk) Sibirien_topo2.png: Ulamm 21:06, 18 April 2008 (UTC) - Sibirien_topo2.png Physical map of Siberia with extent of Siberian traps according to http://www.mantleplumes.org/Siberia.html

---

Wikipedia wrote:

The Siberian Traps (Russian: Сибирские траппы, romanized: Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive eruptive event that formed the traps is one of the largest known volcanic events in the last 500 million years.

The eruptions continued for roughly two million years and spanned the Permian–Triassic boundary, or P–T boundary, which occurred around 251.9 million years ago. The Siberian Traps are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record.

I think I've heard that this enormously prolonged series of volcanic eruptions had something to do with the breaking up of with the super-continent Pangea and/or with the Indian tectonic plate colliding with the Russian plate.

So the Permian–Triassic extinction event happened before the impact event that formed Lake Manicouagan. Well, whatever, the formation of that lake by a falling rock (albeit a large one) is probably not at all comparable to the Earth turning itself inside out to spew red-hot lava and enormous amounts of carbon dioxide into the air for two million years over an area of seven million square kilometers.

Ann

johnnydeep wrote: ↑Sat May 25, 2024 5:31 pm

Ann wrote: ↑Sat May 25, 2024 5:10 pm

Chris Peterson wrote: ↑Sat May 25, 2024 2:32 pm

This occurred when there was only one landmass on Earth, Pangea. The area that became Quebec was at a lower latitude, probably not far north of the tropics.

The radiometric dating methods used to determine the age of the event are very well developed, so the 215 million year determination is almost certainly quite close. I don't think anybody considers the impact to have been the cause of that extinction event, although its climatic impact may have been contributory.

The Siberian Traps, I'm just saying!!!

...

Wikipedia wrote:

The Siberian Traps (Russian: Сибирские траппы, romanized: Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive eruptive event that formed the traps is one of the largest known volcanic events in the last 500 million years.

The eruptions continued for roughly two million years and spanned the Permian–Triassic boundary, or P–T boundary, which occurred around 251.9 million years ago. The Siberian Traps are believed to be the primary cause of the Permian–Triassic extinction event, the most severe extinction event in the geologic record.

I think I've heard that this enormously prolonged series of volcanic eruptions had something to do with the breaking up of with the super-continent Pangea and/or with the Indian tectonic plate colliding with the Russian plate.

So the Permian–Triassic extinction event happened before the impact event that formed Lake Manicouagan. Well, whatever, the formation of that lake by a falling rock (albeit a large one) is probably not at all comparable to the Earth turning itself inside out to spew red-hot lava and enormous amounts of carbon dioxide into the air for two million years over an area of seven million square kilometers.

Ann

I'm still wondering when the supervolcano under Yellowstone National Park in the United States is going to blow. When and if it does, it will make all current concerns about climate warming seem trivial in comparison. But it seems that eruption is no imminent. And besides, we have a sever hurricane season to get through ins 2024 first!

Chris Peterson wrote: ↑Sat May 25, 2024 5:50 pm

johnnydeep wrote: ↑Sat May 25, 2024 5:31 pm

Ann wrote: ↑Sat May 25, 2024 5:10 pm


The Siberian Traps, I'm just saying!!!

...



I think I've heard that this enormously prolonged series of volcanic eruptions had something to do with the breaking up of with the super-continent Pangea and/or with the Indian tectonic plate colliding with the Russian plate.

So the Permian–Triassic extinction event happened before the impact event that formed Lake Manicouagan. Well, whatever, the formation of that lake by a falling rock (albeit a large one) is probably not at all comparable to the Earth turning itself inside out to spew red-hot lava and enormous amounts of carbon dioxide into the air for two million years over an area of seven million square kilometers.

Ann

I'm still wondering when the supervolcano under Yellowstone National Park in the United States is going to blow. When and if it does, it will make all current concerns about climate warming seem trivial in comparison. But it seems that eruption is no imminent. And besides, we have a sever hurricane season to get through ins 2024 first!

It would have no long-term impact on the climate. Single supervolcano events can be devastating locally, and will have some impact on global climate for a few years, but that's all. The only volcanic events that significantly impact long-term climate are flood basalts that last for centuries and produce large igneous provinces like the Deccan Traps.

izizil wrote: ↑Sun May 26, 2024 12:56 am Does anyone else see two additional spots that look like they could also be impact locations? Immediately to the Northwest of the circle for Manicouagan is another smaller circular object and even further northwest is a much larger circular object with a circle in its center. Are these all known to be impact sites or am I seeing something different and interpreting them as impacts?