Early Earth Likely Had Continents And Was Habitable, Says New Study (Forwarded)

"Andrew Yee" wrote in message
...
Office of News Services
University of Colorado-Boulder
Boulder, Colorado

Contact:
Stephen Mojzsis, (303) 492-5014
Jim Scott, (303) 492-3114

Nov. 17, 2005

Note to Editors:
Contents embargoed until 2 p.m. EST on Thursday, Nov. 17.

Early Earth Likely Had Continents And Was Habitable, Says New Study

A surprising new study by an international team of researchers has
concluded Earth's continents most likely were in place soon after the
planet was formed, overturning a long-held theory that the early planet
was either moon-like or dominated by oceans.

The team came to the conclusion following an analysis of a rare metal
element known as hafnium in ancient minerals from the Jack Hills in
Western Australia, thought to be among the oldest rocks on Earth. Hafnium
is found in association with zircon crystals in the Jack Hills rocks,
which date to almost 4.4 billion years ago.

"These results support the view that the continental crust had formed by
4.4-4.5 billion years ago and was rapidly recycled into the mantle," the
researchers wrote in Science Express. Led by Professor Mark Harrison of
the Australian National University, the team also included University of
Colorado Assistant Professor Stephen Mojzsis and researchers from the
University of California, Los Angeles and Ecole Normale Superieure
University in France.

The researchers used hafnium as a "tracer" element, using isotopes to
infer the existence of early continental formation on Earth dating to
Hadeon Eon, which took place during the first 500 million years of Earth's
history, said Mojzsis, an assistant professor of geological sciences at
CU-Boulder. Mojzsis also is a member of CU-Boulder's Center for
Astrobiology.

"The evidence indicates that there was substantial continental crust on
Earth within its first 100 million years of existence," said Mojzsis. "It
looks like the Earth started off with a bang."

A 2001 study led by Mojzsis published in the journal Nature showed
evidence for the presence of water on Earth's surface roughly 4.3 billion
years ago. "The view we are taking now is that Earth's crust, oceans and
atmosphere were in place very early on, and that a habitable planet was
established rapidly," said Mojzsis.

The work was supported in part by a grant from NASA's Exobiology Program.


Earth mach 1 could have had life, intelligent life and technology but it was
all wiped with the moon creating collision and resulting earth mach 2.
Just like wiping the harddrive and starting over.

"Nog" wrote in message
news:iYtff.563$r96.201@trndny05...



Earth mach 1 could have had life, intelligent life and technology but it
was
all wiped with the moon creating collision and resulting earth mach 2.
Just like wiping the harddrive and starting over.


Sparky, did you mean "mark"?

In other words, our salty oceans alwaws existed from the very get go?

Is this moon making impact based upon a gram of hard-science?

Is whatever raw ice in space based upon a gram of hard-science?

Brad Guth

On Sat, 19 Nov 2005 02:53:35 GMT, "Flypaste Wingnut"
wrote, in part:
"Nog" wrote in message
news:iYtff.563$r96.201@trndny05...

Earth mach 1 could have had life, intelligent life and technology but it
was
all wiped with the moon creating collision and resulting earth mach 2.
Just like wiping the harddrive and starting over.

Sparky, did you mean "mark"?

I'm sure he did. Finally, an explanation of how Theem'hdra could have
existed if the Old Ones made humans from chimpanzees only 20 million
years ago... so Exior K'mool was a specimen of pre-Adamic man!

John Savard
http://home.ecn.ab.ca/~jsavard/index.html
http://www.quadibloc.com/index.html
_________________________________________
Usenet Zone Free Binaries Usenet Server
More than 140,000 groups
Unlimited download
http://www.usenetzone.com to open account

Nog ) wrote:




: "Andrew Yee" wrote in message
: ...
: Office of News Services
: University of Colorado-Boulder
: Boulder, Colorado
:
: Contact:
: Stephen Mojzsis, (303) 492-5014
: Jim Scott, (303) 492-3114
:
: Nov. 17, 2005
:
: Note to Editors:
: Contents embargoed until 2 p.m. EST on Thursday, Nov. 17.
:
: Early Earth Likely Had Continents And Was Habitable, Says New Study
:
: A surprising new study by an international team of researchers has
: concluded Earth's continents most likely were in place soon after the
: planet was formed, overturning a long-held theory that the early planet
: was either moon-like or dominated by oceans.
:
: The team came to the conclusion following an analysis of a rare metal
: element known as hafnium in ancient minerals from the Jack Hills in
: Western Australia, thought to be among the oldest rocks on Earth. Hafnium
: is found in association with zircon crystals in the Jack Hills rocks,
: which date to almost 4.4 billion years ago.
:
: "These results support the view that the continental crust had formed by
: 4.4-4.5 billion years ago and was rapidly recycled into the mantle," the
: researchers wrote in Science Express. Led by Professor Mark Harrison of
: the Australian National University, the team also included University of
: Colorado Assistant Professor Stephen Mojzsis and researchers from the
: University of California, Los Angeles and Ecole Normale Superieure
: University in France.
:
: The researchers used hafnium as a "tracer" element, using isotopes to
: infer the existence of early continental formation on Earth dating to
: Hadeon Eon, which took place during the first 500 million years of Earth's
: history, said Mojzsis, an assistant professor of geological sciences at
: CU-Boulder. Mojzsis also is a member of CU-Boulder's Center for
: Astrobiology.
:
: "The evidence indicates that there was substantial continental crust on
: Earth within its first 100 million years of existence," said Mojzsis. "It
: looks like the Earth started off with a bang."
:
: A 2001 study led by Mojzsis published in the journal Nature showed
: evidence for the presence of water on Earth's surface roughly 4.3 billion
: years ago. "The view we are taking now is that Earth's crust, oceans and
: atmosphere were in place very early on, and that a habitable planet was
: established rapidly," said Mojzsis.
:
: The work was supported in part by a grant from NASA's Exobiology Program.
:

: Earth mach 1 could have had life, intelligent life and technology but it was
: all wiped with the moon creating collision and resulting earth mach 2.
: Just like wiping the harddrive and starting over.

And the fossil record indicates this? NO!
Are you going to claim that every single remnant of this previous
civilization has been wiped out?

Eric

Eric Chomko wrote:


: Earth mach 1 could have had life, intelligent life and technology but it was
: all wiped with the moon creating collision and resulting earth mach 2.
: Just like wiping the harddrive and starting over.

And the fossil record indicates this? NO!
Are you going to claim that every single remnant of this previous
civilization has been wiped out?



I think he meant Earth _mark_ 1 BTW -also known as Proteus.
There has been some speculation that the thing (at least one of the two
objects that collided) might have developed life - though probably
nothing very sophisticated - before the big collision, but that whatever
evidence there was of it vanished as the two planets congealed into a
single molten ball of rock, with the Moon as leftovers.
If mammel-like reptiles hadn't been supplanted by the small brained
dinosaurs, you might have had an intelligent species evolve on Earth
around 150-200 million years ago.

Pat