Meteorites Flashcards
1
Q
SNC Meteorite
A
- meteorites from Mars craters land on Earth
- group 347 meteorites
- types of meteorites
Shergotty
Nakhla
Chassigny
2
Q
Shergotty
A
- basaltic to ultramafic rocks
- common
- formed near Martian surface
- most are less than 600 million years
3
Q
Nakhlites and Chassignites
A
- 1.5 to 1.3 billion years old
- Igneous rocks
4
Q
ALH84001
A
- igneous ultramafic rock
- 4.1 billion years old
- altered by water at 3.9 GA
- forming carbonate
- believed to hold life
5
Q
Polymictic Regolith Breccia
A
- martian rocks jumbled by impact - clump
- complex
- contains old samples of Martian crust
6
Q
Mars Rock Tag
A
- as rocks pass through atmosphere tagged by martian gases
7
Q
Chondritic
A
- 3 classes of cosmic sediment: carbonaceous, ordinary, and enstatite
- chondrules
most abundant material in chondrites (minerals) - EX: Murchinson Australia, 1969
carbon rich chondrite fell to Earth - 100 kg
8
Q
Importance of Chondritic Meteorites
A
- contain important liquids
- include volatile compounds
- may have ben thermally/aqueosly altered
- represent bulk composition of parent
9
Q
Comets
A
- comprised mainly of water in ice form and CO2 ice
- also: variety of volatile compounds made from CHNOPS
