Mathematics – Logic
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..829c&link_type=abstract
Meteoritics & Planetary Science, vol. 34, no. 6, pp. 829-848 (1999).
Mathematics
Logic
10
Scientific paper
We have conducted an electron microprobe study of minor element distributions among spinels from two type B1 CAIs; Allende TS-23 and Leoville 3537-2. We show that, by maintaining the petrologic context (edge, middle, and center of the inclusion plus their host silicate phase), four populations of spinels are resolvable based on their minor element contents. One population resides within the edge area (mainly mantle melilite) and is characterized by the highest V contents. Unlike Leoville 3537-2, many edge grains from TS-23 also have high Fe contents (up to 4.0 wt%) and low Cr values. Based on their V and Ti concentrations (which is positively correlated) middle and center grains define a trend which is divided into three populations; spinels enclosed by melilite, fassaite, and anorthite. The overall range in Ti concentration based on fractional crystallization should be much less than a factor of 2, however, the observed range is considerably larger. The minor element contents of these grains are interpreted as recording alteration, primary fractional crystallization, and a complex igneous history that may involve remelting and recrystallization. From our data, Allende TS-23 has experienced more alteration than Leoville 3537-2, consistent with previous petrologic studies of silicates within these objects, yet both objects have likely been remelted (at least one additional melting event, possibly two, proceeding the initial formation of these CAIs). By invoking a remelting history the large range in Ti concentrations and the different populations of spinels can be explained. Although our data suggest that more than one generation of spinels exist within these objects, we are unable to establish any population of relict spinel grains which predate the initial melting event.
Burnett Don S.
Connolly Harold C. Jr.
No associations
LandOfFree
A study of the minor element concentrations of spinels from two Type B CAIs: an investigation into potential formation conditions of CAIs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A study of the minor element concentrations of spinels from two Type B CAIs: an investigation into potential formation conditions of CAIs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A study of the minor element concentrations of spinels from two Type B CAIs: an investigation into potential formation conditions of CAIs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1288218