TEXTURAL AND MICROANALYSIS OF IGNEOUS ROCKS: TOOLS ...

C A/B / D A/B
C A/B / D A/B
Unit 4 O
A)
K
10-1D-A
L
Unit 10 B)
10-1C-A
Q
10-1C-B1
P
10-1C-B2
J
10-2A-C
N
10-1C-D
10-2A-D
D
A C
Sr
Sr
Figure 4.15. A) Two of ten Unit 4 crystals are within analytical
uncertainty (the propagated 2σ error when values are divided, e.g.,
Sr/Sr) of having reached Sr diffusive equilibrium, whereas one of ten
have reached C) La diffusive equilibrium. The diffusive equilibrium is
drawn based upon equation 4.4. B) Six of seven Unit 10 phenocrysts
are within error of having reached Sr diffusive equilibrium, whereas five
of seven crystal are within error of the La diffusive equilibrium line.
These results indicate La diffuses slower than Sr, which is consistent
with the findings of [27].
212
K
10-1D-A
L
10-1C-A
Q
10-1C-B1
P
10-1C-B2
J
10-2A-C
N
10-1C-D
O
10-2A-D
D
A
C
La
La
C)