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Diamonds Linked to Quick Cooling Eons Ago
NY Times ^ | January 2, 2009 | KENNETH CHANG

Posted on 01/02/2009 9:02:31 AM PST by Pharmboy


University of Oregon
Scientists found microscopic diamonds in the black layer of rock at Murray Springs in Arizona.

At least once in Earth’s history, global warming ended quickly, and scientists have long wondered why.

Now researchers are reporting that the abrupt cooling — which took place about 12,900 years ago, just as the planet was emerging from an ice age — may have been caused by one or more meteors that slammed into North America.

That could explain the extinction of mammoths, saber-tooth tigers and maybe even the first human inhabitants of the Americas, the scientists report in Friday’s issue of the journal Science.

The hypothesis has been regarded skeptically, but its advocates now report perhaps more convincing residue of impact: a thin layer of microscopic diamonds found in rocks across America and in Europe.

“We’re up over 30 sites, as far west as offshore California, as far east as Germany,” said Allen West, a retired geology consultant who is one of the scientists working on the research.

The meteors would have been smaller than the six-mile-wide meteor that struck the Yucatán peninsula 65 million years ago and led to the mass extinctions of the dinosaurs. The killing effects of the hypothesized bombardment 12,900 years ago would have been more subtle.

Climatologists believe that the direct cause of the 1,300-year cold spell, known as the Younger Dryas, was a sudden rush of fresh water from a giant lake in central Canada to the North Atlantic.

Usually a surface current of warm water flows northward in the Atlantic toward Greenland and Europe, then cools and sinks, returning south in the deep ocean. But the fresh water, which is less dense, blocked the sinking of the cold, salty water in the North Atlantic, disrupting the currents.

(Excerpt) Read more at nytimes.com ...


TOPICS: Extended News; News/Current Events
KEYWORDS: catastrophism; diamonds; extinctions; geology; globalcooling; godsgravesglyphs; meteor; oldearthspeculation
As the article says, not all the geologists are buying into this. The big question is: where's the crater(s)?
1 posted on 01/02/2009 9:02:31 AM PST by Pharmboy
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To: blam; SunkenCiv; Coleus; aculeus; thefactor

Global cooling ping...


2 posted on 01/02/2009 9:03:54 AM PST by Pharmboy (BHO: making death and taxes yet MORE certain...)
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To: Pharmboy

Diamonds...They don’t call them “ice” for nothin’.


3 posted on 01/02/2009 9:04:18 AM PST by gimme1ibertee (Sarahlution!!!!!)
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To: Pharmboy

Another bit of “inconvenient” evidence to suggest Gore’s theories on global warming are a pile o crap.


4 posted on 01/02/2009 9:08:19 AM PST by vox_freedom ("If God be for us, who is against us?" -- Romans 8:31)
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To: Pharmboy

Small crystals equal rapid cooling, large crystals equal slow cooling.

Sience class wasn’t a total waste.


5 posted on 01/02/2009 9:08:30 AM PST by cripplecreek (The poor bastards have us surrounded.)
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To: Pharmboy

Isn’t this an incorrect usage of the term eon? I thought an eon was composed of more than one geological age...

Well, it is the NYT, so I guess I should not expect much.


6 posted on 01/02/2009 9:11:48 AM PST by marktwain
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To: Pharmboy
The Mercury News has a very similar article today that hypothesizes that a large comet exploded above ground, hence no crater.

It's well known that a meteorite colliding with Earth is considered the most likely reason dinosaurs died off 65 million years ago. Now a team of scientists says it has found new evidence that a comet triggered a similar extinction much more recently: just 13,000 years ago, when humans were around to witness the event and suffer its terrible consequences.

The researchers think the comet exploded above the planet's surface, ultimately killing off mammoths, saber-toothed tigers and other large mammals that roamed North America.

The scientists, led by University of Oregon anthropologist Douglas Kennett, say their report offers up a "smoking bullet" — proof that a comet set off the sudden, thousand-year freeze and wiped out the big animals of the era.


7 posted on 01/02/2009 9:13:08 AM PST by ProtectOurFreedom
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To: Pharmboy

Diamonds are forever...


8 posted on 01/02/2009 9:14:50 AM PST by null and void (Petroglyphs. The original cliffs notes...)
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To: Pharmboy
Usually a surface current of warm water flows northward in the Atlantic toward Greenland and Europe, then cools and sinks, returning south in the deep ocean. But the fresh water, which is less dense, blocked the sinking of the cold, salty water in the North Atlantic, disrupting the currents.

How can "less dense" fresh water block the sinking of cold, salty water? Higher density fluids sink relative to other fluids. Is this New York Slimes science, or am I missing something?

9 posted on 01/02/2009 9:18:54 AM PST by Smedley (It's a sad day for American capitalism when a man can't fly a midget on a kite over Central Park)
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To: cripplecreek

Actually, the microscopic diamonds are a result of a meteor impact, not due to cooling. Impact-type microdiamonds can be used as one indicator of impact craters.


10 posted on 01/02/2009 9:27:35 AM PST by Smedley (It's a sad day for American capitalism when a man can't fly a midget on a kite over Central Park)
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To: Smedley

That sentence stopped me also. Perhaps the high-riding, less dense fresh water disrupted the salt water cycling...


11 posted on 01/02/2009 9:30:09 AM PST by Pharmboy (BHO: making death and taxes yet MORE certain...)
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To: Pharmboy

Thought that heat and pressure made diamonds ... a diamond is nothing but a lump of coal that stuck with it


12 posted on 01/02/2009 9:50:40 AM PST by SkyDancer ("Talent Without Ambition Is Sad, Ambition Without Talent Is Worse")
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To: Pharmboy

The theory goes that all of the fresh water diluted the denser “salt” water turning the Atlantic into more or less of a giant still lake.

Eh, as good a theory as any I guess.


13 posted on 01/02/2009 10:11:34 AM PST by padre35 (You shall not ignore the laws of God, the Market, the Jungle, and Reciprocity Rm10.10)
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To: Pharmboy
That sentence stopped me also. Perhaps the high-riding, less dense fresh water disrupted the salt water cycling...

That may be. However, as we are talking about an article in the NY Slimes, there's no guarantee of common sense or accuracy.

14 posted on 01/02/2009 10:24:01 AM PST by Smedley (It's a sad day for American capitalism when a man can't fly a midget on a kite over Central Park)
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To: Pharmboy
See post #40 on this thread.
15 posted on 01/02/2009 10:52:15 AM PST by blam
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Scientists find signs of 13,000-year-old extinction event
Chicago Tribune | January 2, 2009 | Robert Mitchum
Posted on 01/01/2009 2:09:17 PM PST by neverdem
http://www.freerepublic.com/focus/f-news/2157352/posts


16 posted on 01/02/2009 11:25:02 AM PST by SunkenCiv (https://secure.freerepublic.com/donate/_______Profile finally updated Saturday, December 6, 2008 !!!)
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The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization

by Richard Firestone,
Allen West, and
Simon Warwick-Smith


17 posted on 01/02/2009 11:27:19 AM PST by SunkenCiv (https://secure.freerepublic.com/donate/_______Profile finally updated Saturday, December 6, 2008 !!!)
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To: Pharmboy
thanks Pharmboy, adding to both lists, but not pinging. :')
 
Catastrophism
 
· join · view topics · view or post blog · bookmark · post new topic ·
 

· join list or digest · view topics · view or post blog · bookmark · post a topic ·

 
Gods
Graves
Glyphs
Just adding to the catalog, not sending a general distribution.

To all -- please ping me to other topics which are appropriate for the GGG list.
GGG managers are SunkenCiv, StayAt HomeMother, and Ernest_at_the_Beach
 

· Google · Archaeologica · ArchaeoBlog · Archaeology · Biblical Archaeology Society ·
· Discover · Nat Geographic · Texas AM Anthro News · Yahoo Anthro & Archaeo ·
· The Archaeology Channel · Excerpt, or Link only? · cgk's list of ping lists ·


18 posted on 01/02/2009 11:29:11 AM PST by SunkenCiv (https://secure.freerepublic.com/donate/_______Profile finally updated Saturday, December 6, 2008 !!!)
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To: Pharmboy; Coyoteman; djf; blam; SunkenCiv; neverdem
Ping to yet another nanodiamond, "black mat", Younger Dryas, Clovis extinction, etc. thread...

(In the meantime, I've been using Google Maps to look at lots of "Carolina Bays" in the Myrtle Beach, SC area...)

19 posted on 01/02/2009 11:33:03 AM PST by TXnMA ("Allah": Satan's current alias...!!)
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To: blam

Thanks...great stuff.


20 posted on 01/02/2009 12:28:22 PM PST by Pharmboy (BHO: making death and taxes yet MORE certain...)
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To: Pharmboy

bump


21 posted on 01/02/2009 12:35:41 PM PST by Captain Beyond (The Hammer of the gods! (Just a cool line from a Led Zep song))
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To: Pharmboy

Cool!


22 posted on 01/02/2009 1:27:53 PM PST by aculeus
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To: Pharmboy

Eons ago? 13000 years isn’t even roundoff error on the “eon scale”.


23 posted on 01/02/2009 1:40:55 PM PST by norwaypinesavage (Global Warming Theory is extremely robust with respect to data. All observations confirm it)
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To: Smedley
How can "less dense" fresh water block the sinking of cold, salty water? Higher density fluids sink relative to other fluids. Is this New York Slimes science, or am I missing something?

If a layer of salt water sits beneath a layer of fresh water, convection will be far less effective than it would be if all water were of uniform salinity. The article's terminology is weird, however, since the salt water wouldn't be stuck on the surface but rather below.

Incidentally, ice is nearly always frozen fresh water; the act of freezing pushes out the salt. This could create variations in salinity, though in most cases natural mixing would prevent them from becoming too significant.

24 posted on 01/02/2009 2:26:00 PM PST by supercat (Barry Soetoro == Bravo Sierra)
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To: Pharmboy
The big question is: where's the crater(s)?

There's plenty of craters. Earth Impact Database. (Interesting website to peruse. Just FYI, the biggest is the Vredefort ring, in South Africa. 300km across.)

25 posted on 01/02/2009 2:55:38 PM PST by Lee N. Field ("I've studied bible prophecy 30 years." usually means "I've never hear of Geerhardus Vos.")
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To: TXnMA

Thanks for the ping. Happy New Year!


26 posted on 01/02/2009 4:35:08 PM PST by neverdem (Xin loi minh oi)
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To: Lee N. Field

Thanks for the data...good addition to this thread.


27 posted on 01/02/2009 6:30:56 PM PST by Pharmboy (BHO: making death and taxes yet MORE certain...)
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To: supercat
If a layer of salt water sits beneath a layer of fresh water, convection will be far less effective than it would be if all water were of uniform salinity. The article's terminology is weird, however, since the salt water wouldn't be stuck on the surface but rather below.

This I understand, but the scenario is supposedly a layer of fresh water sitting beneath a layer of salt water not allowing the salt water to sink.

This isnt an issue of "terminology" but one of a complete screwup of the description of circumstances.

28 posted on 01/05/2009 7:43:00 AM PST by Smedley (It's a sad day for American capitalism when a man can't fly a midget on a kite over Central Park)
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