[meteorite-list] CAI and chondrules

[Francesco Moser]

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