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UK Impact Crater Debate Heats Up
BBC ^
| 3-30-2007
| Jonathan Fildes
Posted on 03/30/2007 2:44:14 PM PDT by blam
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1
posted on
03/30/2007 2:44:15 PM PDT
by
blam
To: blam
interesting. there's evidence both ways, but the salt hypothesis seems more likely. I'm no expert, but I'm considering getting a geology degree (and do have some real knowledge) and for what it's worth, a basin related to salt flow is exactly what popped into mind after reading 7 words into the article, to North Sea.
2
posted on
03/30/2007 3:17:06 PM PDT
by
verum ago
(The Iranian Space Agency: set phasers to jihad!)
To: verum ago
Would not some cores of the crater add more information? The presence of minerals known to be created in cosmic impacts would seem to confirm the impact theory, but the lack of minerals couldn't discount it, either, current erosion and all that.
To: verum ago
yes- cores of the crater would make or break the impact hypothesis very easily- since the site is under water and has in fact had further sediments deposited onto it, the original mineralogy of the sea-bottom crater should be intact. Even if it was destroyed, then there should still be distinctive 'shocked' mineral crystals in the bedrock underlaying the crater.(this is one of the nicer features of large impacts- they leave behind evidence in the nearby bedrock that wasn't macroscopically deformed, meaning that even if the entire crater structure (surface and subsurface) was erased there could still be evidence of the impact. of course, without the crater structures no one would look for these signs)
the problems here are that the geometry of the basin suggest an impact (as does the 'nipple' structure), but such extensive and symmetric concentric rings haven't been observed except on icy bodies elsewhere in the solar system- where the topmost layer is the most rigid and the ones beneath are more plastic or even fluid- it should be the opposite on earth. Of course no salt recession basin has ever been seen with so perfect geometry, but if it's true that the area is littered with similar features and that they correspond with thinning in the salt layer the salt theory would be a lot stronger. The fact is that the multitude of rings actually is a bit problematic for both hypotheses- it could theoretically be possible for both, but has never been observed under the circumstances for either.
4
posted on
03/30/2007 4:07:56 PM PDT
by
verum ago
(The Iranian Space Agency: set phasers to jihad!)
To: blam
"I can't understand why John keeps banging away at an alternative model," said team member Dr Simon Stewart, a geologist with BP. Maybe they'll demand that his credentials be revoked and that his funding be rescinded?
-PJ
To: verum ago; blam
And what about a strike into the ice-pack during the last major freeze when the sea would have been frozen to the bottom?
6
posted on
03/30/2007 7:01:17 PM PDT
by
brityank
(The more I learn about the Constitution, the more I realise this Government is UNconstitutional !!)
To: Political Junkie Too
It can only be seen on seismic data, collected by petroleum companies hunting for new oil and gas fields.It was found by those evil oil companies. Nothing good can come from this.
7
posted on
03/30/2007 7:04:10 PM PDT
by
Erik Latranyi
(The Democratic Party will not exist in a few years....we are watching history unfold before us.)
To: brityank
well then I guess the evidence would be limited to a Tommy Lee Jones movie produced by Al Gore.
8
posted on
03/30/2007 7:04:43 PM PDT
by
verum ago
(The Iranian Space Agency: set phasers to jihad!)
To: brityank
"And what about a strike into the ice-pack during the last major freeze when the sea would have been frozen to the bottom?""However, the group that discovered the structure in 2002 stands by its original theory of a cataclysmic asteroid or comet impact about 60-65 million years ago. "
I don't know what the climate was like in that period. I think the dino's were just clobbered by the Chixlub impact down in Mexico.
9
posted on
03/30/2007 8:28:15 PM PDT
by
blam
To: blam
"However, the group that discovered the structure in 2002 stands by its original theory of a cataclysmic asteroid or comet impact about 60-65 million years ago. " Their note does place it into one of the major ice sheet coverings, I think.
10
posted on
03/30/2007 9:31:01 PM PDT
by
brityank
(The more I learn about the Constitution, the more I realise this Government is UNconstitutional !!)
To: brityank
I've read that cosmic impacts on land causes it to get colder while an impact in water causes things to warm up. I think impacting into ice would be similar to results of a water impact, warming.
11
posted on
03/31/2007 6:36:47 AM PDT
by
blam
To: brityank
BTW, some pretty respectable scientists think a comet or comet fragment impacts caused the last Ice Age to end and we're still enjoying the benefits from that.
12
posted on
03/31/2007 6:39:05 AM PDT
by
blam
13
posted on
12/22/2012 12:15:18 PM PST
by
SunkenCiv
(Romney would have been worse, if you're a dumb ass.)
- Antarctic Craters Reveal Strike
- Did a Pacific Ocean meteor trigger the Ice Age?
- The Eltanin Impact Crater
- (How's This For Strange?) Mysterious Mass Whale Graveyard Unearthed in the Chilean Desert
- Unearthed: The Humble Origins Of World Diplomacy (Hittites)
- Mystery of the Eltanin Antenna
- Keyword: eltanin
- Keyword: eltanin impact
- Amateur Geologist Makes Surprising Find (Japan)
- Antarctic Craters Reveal Strike
- Apocalypse Then
- An Argument for the Cometary Origin of the Biosphere
- Arizona Meteorite Crater Mystery Solved
- Asteroid 'Hit Northern Russia'
- Asteroid Theory of Dinosaur Extinction Questioned
- Astronomers unravel a mystery of the Dark Ages
- Cataclysm 3.9 Billion Years Ago Was Caused By Asteroids, Not Comets
- A Celestial Collision
- Chesapeake Bay Crater Offers Clues To Ancient Cataclysm
- Clare Places: Islands: Mutton Island or Enniskerry (9th century catastrophe in Ireland)
- Closest Asteroid Yet Flies Past Earth
- The Comet and the Future of Science
- Comet or Meteorite Impact Events in 1178AD?
- Comet put on list of potential Earth impactors
- Comets, Meteors, & Myth: New Evidence For Toppled Civilizations And Bibical Tales
- Cosmic Hole-in-One Captured Over Antarctica
- Cracking the Mystery (Cretaceous, Great Dying, Chicxulub)
- The Curious Tale of Asteroid Hermes (Look up this week and watch asteroid sail by!)
- The Dark Ages: Were They Darker Than We Imagined?
- Dark Days Doomed Dinosaurs, Say Purdue Scientists
- The day the sky fell in
- Did Asteroids And Comets Turn The Tides Of Civilization?
- Dino impact gave Earth the chill
- Drilling Finds Crater Beneath Va. Bay
- Earth's Volcanism Linked To Meteorite Impacts
- Earthgrazers and Fireballs: The Strange Side of The Leonid Meteor Shower
- Earth's gravity may lure deadly asteroid
- The Eltanin Impact Crater
- Evidence for Major Impact Events in the late Third Millennium BC
- Evidence Of Tunguska-Type Impacts Over The Pacific Basin Around The Year 1178 AD
- Geology Picture of the Week, January 2-8, 2005: Evidence of Ancient Cretaceous Catastrophe
- Geology Picture of the Week, January 2-8, 2005: Evidence of Ancient Cretaceous Catastrophe
- Geology Pictures of the Two Weeks, September 4-17, 2005: Images of the Chichen Itza Cenote
- Giant asteroid rocked Antarctica
- Giordano Bruno, the June 1975 Meteoroid Storm, Encke, and Other Taurid Complex Objects
- Going Into The Water: A Survey Of Impact Events And The Coastal Peoples Of South-East North America
- Google Map Mystery (Satellite imaging catches a UFO over Magnolia Gardens, Fla.)
- Grains Found in Ga. Traced to Asteroid
- The Hazard of Near-Earth Asteroid Impacts on Earth
- Headless Comets Survive Plunge Through Sun's Atmosphere
- Huge Crater Found in Egypt - Kebira
- An Impact Event in 3114BC? The beginning of a Turbulent Millennium.
- Iron meteorites may be solar system boomerangs
- It Came from Outer Space?
- Mass Extinctions - A Threat From Outer Space Or Our Own Planet's Detox?
- Mass-extinction controversy flares again (Chicxulub crater kills dinosaurs, or not?)
- Meteor Clue To End Of Middle East Civilisations
- Meteor Clue To End Of Middle East Civilisations
- Meteor shards linked to massive extinction
- 'Meteorite' Hits Girl
- Moon over Chicxulub: Will Night Finally Fall on the Dinosaur-Extinction Debate?
- Moon's Youngest Crater Discovered
- Mystery object lights up Northwest sky
- NASA Solves Moon Mystery (+Geology Picture of the Week, February 16-22, 2003)
- New Theory: Catastrophe Created Mars' Moons
- Northern Crater Shows Prehistoric Deep Impact
- Northern sea baffles archaeologists
- ODD ASTEROID
- The Peekskill Fireball (October 9, 1992)
- Police On Meteor Alert After Huge Balls Of Fire Light Up Spanish Sky
- Precise Distance to Doomsday (today was the closest encounter from 1353 to 2562)
- Radar Reveals Five Double Asteroid Systems Orbiting Each Other Near Earth
- Recently Discovered Near-Earth Asteroid Makes Record-breaking Approach to Earth
- Roman Comet 5,000 Times More Powerful Than A-Bomb
- Satellite Photo: What is this?
- Scientist: Asteroid May Hit Earth in 2029
- Scientists Probe Asteroid Crash
- Scientists Uncover 'Deep Impact' Disaster From Space
- The Search for the Missing Amazon Meteor
- SIBERIA METEORITE FLATTENS 40 SQ MILES
- Small Asteroid Passes Between Satellites and Earth
- Small Comets and Our Origins
- Space rock 'on collision course'
- Space Rock To Hurtle Past Earth
- What Caused Argentina's Craters?
14
posted on
12/22/2012 12:29:49 PM PST
by
SunkenCiv
(Romney would have been worse, if you're a dumb ass.)
To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...
Note: this topic was posted on March 30, 2007.
Thanks blam.
15
posted on
12/22/2012 12:31:15 PM PST
by
SunkenCiv
(Romney would have been worse, if you're a dumb ass.)
To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...
Note: this topic was posted on March 30, 2007.
Thanks blam.
16
posted on
12/22/2012 12:31:58 PM PST
by
SunkenCiv
(Romney would have been worse, if you're a dumb ass.)
17
posted on
12/22/2012 12:42:42 PM PST
by
SunkenCiv
(Romney would have been worse, if you're a dumb ass.)
To: brityank; SunkenCiv; blam; All
This chart is an indication of temperature changes over the last one million years. The article is about an event 60-65 million years ago. This chart has nothing to do with that time period. Also, any evidence of tsunami wash would have long ago been destroyed by many, many ice sheets.
To: Erik Latranyi; Political Junkie Too; verum ago; SunkenCiv; blam; All
Those evil oil companies supplied the data that enabled the Alvarez team to discover the Yucatan meteor crater of 65 million years ago (mya). Apparently oil deposits and the extreme pressure caused by these strikes can go hand in hand. There is an apparent crater off the Brazilian coast which seems to be an oil source. Given the oil in the North Sea, this goes along with that idea. Also, multiple craters around the same time period are not unheard of. The Chesapeake (Bay) Meteor strike of 34 mya, also had companions of roughly the same age, including a 10 mile wide crater off Toms River, NJ, and a 60 mile wide crater (Popogai (sp?) in Siberia. Another comment here mentions a possible crater off Maine of the right age (65 mya).
The Chesapeake Meteor was verified by deep coring which showed breccia and shocked quartz. They also hope to find oil around there.
To: SunkenCiv; Swordmaker; blam; ForGod'sSake
20
posted on
12/23/2012 9:54:53 PM PST
by
Fred Nerks
(FAIR DINKUM!)
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