The SUN

Different chemical elements absorb radiation at specific wavelengths.
Amount of light absorbed is proportional to the amount of an element present
Relative to a nominal abundance of Silicon -- 10*6 atoms.
Fe is ~10^6 times abundant in the SUN than Pb.
Au and Pt are comparable to Pb.
Different chemical elements gradually condensed according to their individual volatilities.
In a very low Pressure condition of nebula, difference in their boiling points becomes important.

Meteorites

Mostly derived from asteroid belt.
Resulted from gravitational disturbances caused by Jupiter, perturbing the orbits of individual asteroids and causing repeated violent collisions that resulted in further fragmentation rather than accretion.

Classifications of Meteorites:
1. Stony meteorites --

(dominant of silicate minerals)
95% of all known meteorite
subdivided into chondrites (chondrules) and achondrites
“Differentiated”

2. Iron meteorites --

(composed of metallic iron)
“Differentiated”

3. Stony-iron meteorites --

(hybrid of the other two)

{“Differentiated” - Enrichment of Fe and Ni due to removal of some or all of the silicate minerals}

Achondrites-

10% of all stony meteorite.
reminiscent of terrestrial Igneous rocks.

Chondrites-

1. Ordinary chondrites- most abundant type
2. Enstatite (or E-) chondrites- rich in Enstatite (MgSiO3)
3. Carbonaceous (or C-) chondrites- carbon rich organic compounds in addition to silicates minerals.

{Again ordinary chondrites are subdivided according to their iron contents and their oxidation state}

	Created by Nilesh Mayank over 9 years ago

Note on ES1201_Notes, created by Nilesh Mayank on 11/02/2017.