TY - JOUR
T1 - Whitlockite and apatite from lunar rock 14310 and from Ödegården, Norway
AU - Griffin, W. L.
AU - Åmli, R.
AU - Heier, K. S.
PY - 1972
Y1 - 1972
N2 - Microprobe analyses show that whitlockite from lunar rocks is enriched in REE relative to the associated apatite, whereas a terrestrial whitlockite is severely depleted in REE relative to the associated apatite. After considering other possibilities, we suggest that the lunar whitlockite originally crystallized as the high-T polymorph, which is capable of taking up excess CaO (and REE?). Inversion to the low-T form has been inhibited by the non-stoichiometry, so that the present "whitlockite" phase is poorly crystalline. Similar relations may exist in terrestrial basalts of low water content, but would be easily overlooked in petrographic studies.
AB - Microprobe analyses show that whitlockite from lunar rocks is enriched in REE relative to the associated apatite, whereas a terrestrial whitlockite is severely depleted in REE relative to the associated apatite. After considering other possibilities, we suggest that the lunar whitlockite originally crystallized as the high-T polymorph, which is capable of taking up excess CaO (and REE?). Inversion to the low-T form has been inhibited by the non-stoichiometry, so that the present "whitlockite" phase is poorly crystalline. Similar relations may exist in terrestrial basalts of low water content, but would be easily overlooked in petrographic studies.
UR - http://www.scopus.com/inward/record.url?scp=0002895564&partnerID=8YFLogxK
U2 - 10.1016/0012-821X(72)90028-3
DO - 10.1016/0012-821X(72)90028-3
M3 - Article
AN - SCOPUS:0002895564
SN - 0012-821X
VL - 15
SP - 53
EP - 58
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 1
ER -