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| Florian |
 Posted: Sun Jul 29, 2007 4:56 pm |
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George <george@yourservice.com> wrote:
[quote:31a099a0ff]Wait. Don't EEers say that there is no evidence of ocean floors older than
250 million years?
[/quote:31a099a0ff]
No. They don't. EEers say that the current ocean basin were closed. But
submarine eruption and rifting in epicontinental seas like the one
described in this paper still existed. Look at figure 10 of the original
paper, the alledged depth of the sea is 600-1000 m.
Jianghai Li , Timothy M. Kusky. World's largest known Precambrian fossil
black smoker chimneys and associated microbial vent communities, North
China: Implications for early life. Gondwana Research 12 (2007) 84 - 100
Besides, while this is an interesting paper which provides some clues
about microbial population of ancient chimney, the conclusion that it
provides clues about early life is far fetched. The oldest fossils of
cyanobacteria are much older, about 3.5 billions years old. That is 2
billions years older.
--
Florian
"Tout est au mieux dans le meilleur des mondes possibles"
Voltaire vs Maupertuis |
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| Aidan Karley |
| Posted: Mon Aug 06, 2007 7:27 pm |
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In article <6qKqi.23878$7G1.15376@bignews4.bellsouth.net>, George wrote:
[quote:54291db1e8]It's the first known case where such microbes have been shown to have lived
within the ancient fossil chimneys.
"known" is an important word in that.[/quote:54291db1e8]
One of Brasier's criticisms of Schopf's claim of 3.5 Gyr fossils in
Archean is that such structures could be produced abiologically. And of
course, Schopf's claim is for much older organisms than "1.43 billion years
old,". Braiser also claims that Schopf's mapping of the cherts as deformed
sea-bed deposits is wrong, and that they're actually the feeders for a
hydrothermal system in the stratigraphically higher unit.
There's a lot of interesting work being done on the acid-base and redox
interactions that can take place in the immediate environs of a black smoker,
and particularly in how water filtering through a porous mass of sulphide
could model a "metabolism-first" mechanism for biogenesis.
--
Aidan Karley, FGS,
Aberdeen, Scotland
A light wave is more like a crime wave than a water wave. |
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| George |
| Posted: Tue Aug 07, 2007 12:37 pm |
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"Aidan Karley" <name1_name2@email.provider.invalid> wrote in message
news:VA.0000142e.0297fffe@email.provider.invalid...
[quote:70cf1d691e]In article <6qKqi.23878$7G1.15376@bignews4.bellsouth.net>, George wrote:
It's the first known case where such microbes have been shown to have
lived
within the ancient fossil chimneys.
"known" is an important word in that.
One of Brasier's criticisms of Schopf's claim of 3.5 Gyr fossils in
Archean is that such structures could be produced abiologically. And of
course, Schopf's claim is for much older organisms than "1.43 billion
years
old,". Braiser also claims that Schopf's mapping of the cherts as
deformed
sea-bed deposits is wrong, and that they're actually the feeders for a
hydrothermal system in the stratigraphically higher unit.
There's a lot of interesting work being done on the acid-base and
redox
interactions that can take place in the immediate environs of a black
smoker,
and particularly in how water filtering through a porous mass of sulphide
could model a "metabolism-first" mechanism for biogenesis.
--
Aidan Karley, FGS,
Aberdeen, Scotland
A light wave is more like a crime wave than a water wave.
[/quote:70cf1d691e]
It certainly is interesting work, isn't it. And obviously none of this is
set in stone, so to speak. Lot's of frontline research left to do.
George |
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