Reading: Wood (2005)
1. In Wood's model, where do chondrules and CAIs form, and by which mechanism(s)?
2. According to Wood's model, how are the age data for chondrules (figure 1) explained? Your answer should mention the age ranges in particular chondrite groups as well as the differences between them.
3. Wood assigns different chondrite groups to different formation locations and times (figure 2). Create a table that summarizes the reasons for placing chondrite groups in different location-age boxes (e.g., chondrite group in column 1, reason for location in column 2, and reason for age in column 3). Indicate uncertainties by question marks.
4. According to Wood, differences in bulk compositions between chondrites and the sun provide evidence for a refractory element and metal fractionation. (a) What elements were affected by each of these fractionations? (b) How did the fractionations occur (mention process and timing), according to Wood?
5. Wood suggests that the product of particle density and particle size could have been important in explaining chemical fractionations. Explain.
6. According to Wood, what role did C play in the formation
of enstatite chondrites (EH and EL), and chondrules?