[meteorite-list] CAI and chondrules

From: Francesco Moser <cojack_at_meteoritecentral.com>
Date: Fri, 2 Oct 2009 19:27:18 +0200
Message-ID: <7580EE4D7ACE484BA4845EAA4E001B7A_at_fisso>

Thanks a lot to everyone who gave me an answer! I hoped that there were some
sharp idea about the chodrules and the CAI's but I have understand that
there are just tons of doubts :(

Best regards!

<>X<>X<>X<>X<>
Francesco Moser
IMCA #1510



----- Original Message -----
From: "MEM" <mstreman53 at yahoo.com>
To: "ZZ ML Meteorite-List" <meteorite-list at meteoritecentral.com>; "Francesco
Moser" <cojack at tiscali.it>
Sent: Thursday, October 01, 2009 9:55 AM
Subject: Re: [meteorite-list] CAI and chondrules


> I've my own collection of ideas as to how chondrules developed but will
> save them for later. As to CAIs and their presence in carbonaceous
> meteorites. A list member and I had this discussion some time ago and the
> answer may lie in a process in the "T-Tauri" stage of stellar evolution.
>
> When the T-Tauri protostar goes thermonuclear it loses a mass through a
> high solar wind output which sweeps a lot of the remaining unaccreted
> debris from the inner solar system--we believe. This is the foundation
> for our ability to develop isotopic curves of regions based on distance
> from the sun and explains the rocky inner planets and the gas giants much
> further out in the solar system. This probably is a player in chondrule
> formation. CAIs are dated to about 2 million years older.
>
> Prior to the hydrogen fuel-burning stage, there was an ongoing fission
> process which is the likely source for the short-lived isotopes such as
> 26Al. While I can't lay my hands on the link, I recall some diagrams of a
> particular phase of T-Tauri accretion where the dynamics were such that
> even though the solar disk was being spun into a flat, thin, rotating
> disk, the poles of the proto-sun were ejecting major mega streams of
> lighter, probably charged particles-- mainly such as calcium, aluminum,
> carbon, helium, etc. The particle streams resembled fountains spraying
> very high speed particles many many AUs up and out of the plane of the
> ecliptic into two giant hemispheres.
>
> If true, this tends to explain the Ort cloud formation and how CAIs were
> available for inclusion in cometary-like carbonaceous meteorites along
> with younger chondrules. It explains how CAIs predate the sun's fusion
> stage and how they were able to skip the mega solar winds generated when
> the sun kicked over to fusion from fission. Comets forming inside the Ort
> Cloud but outside the ecliptical plane my be devoid of chondrules
> (possible example: Tagish Lake)
>
> 1) supernova
> A super nova is theorized to be the catalyst for compressing enough dust
> close enough for gravity to take over and condense the early initial solar
> disk getting things spinning into a disk.
>> 2) few time later CAI formation
> Yes but a long time later, possibly explained under the T-Tauri pre-fusion
> stage during the collapse of the solar disk.
> 3) at the same time collapse of nebula
> Yes but probably well after the accretion stage was under way.
> 4) 2My later condrule formation.
> Yes again
>> 5) at the same time proto-sun and proto-planetary formation
> Probably in connection with the fusion to fusion change-over and during
> the interval before mega-solar wind swept out the lighter elements from
> the inner solar system and stopped chondrule formation.
>> 6) ...
> There were probably at least 6 additional Mars sized planets else
> planetary centers of accretion and some theorize 30 or more. One was
> accounted for by our moons formation, another knocked Uranus on its side
> one or more contributed to the asteroid belt. Someplace in the sequence
> comets formed outside the mainstream goings on in the solar disk/system it
> self.
>
> Elton
>
> --- On Wed, 9/30/09, Francesco Moser <cojack at tiscali.it> wrote:
>
>> From: Francesco Moser <cojack at tiscali.it>
>> Subject: [meteorite-list] CAI and chondrules
>> To: "ZZ ML Meteorite-List" <meteorite-list at meteoritecentral.com>
>> Date: Wednesday, September 30, 2009, 5:37 PM
>> Hello!
>> I take a look on wikipedia about CAI and chondrules, but I
>> have still some doubt.
>>
>> http://en.wikipedia.org/wiki/Calcium-aluminium-rich_inclusion
>> http://en.wikipedia.org/wiki/Chondrule
>>
>> What prompted the formation of CAI? and what's caused the
>> formation of chondurles???
>> The supernova gave the energy for the formation of CAI and
>> for the collapse of the solar nebula?
>> Some other energy source, still unknow, 2 million years
>> later molten the material which formed the chondrules? But
>> wich type of energy source?
>>
>> Is correct this time line?
>>
>> 1) supernova
>> 2) few time later CAI formation
>> 3) at the same time collapse of nebula
>> 4) 2My later condrule formation
>> 5) at the same time proto-sun and proto-planetary
>> formation
>> 6) ...
>>
>> Thanks a lot!
>>
>> Best regards!
>>
>> Francesco Moser
>> IMCA #1510
Received on Fri 02 Oct 2009 01:27:18 PM PDT