56
C. Variations of Stable Isotope Ratios in Nature
/
Ti~r~r~t~ 1~~~~yte •
San Marcos gabbro. Duke I. gabbro (N368)
(TaYIO~~lf)steln,
Kiglapait gabbro(Kig54)
Skaergaard gabbro (4312)
--• Skaergaard gabbro (5181)
Nain anorthosite (N-12)
Lassen dacite (hornblende)
.Tristan do Cunha basalt
(Gorlick, 1966)
~ll Px-mag =0.68
llFeld-mog
Average diopsidic Qugite- massive
magnetite fractionation
S.E. Alaska ultramafic bodies
~
2
3
/:). pyroxene- magnetite
Fig. 24. Relationship between Ll-values of feldspar-magnetite and pyroxene-magnetite for feldspar-pyroxene-magnetite assemblages in igneous rocks. Data are from
TAYLOR and EpSTEIN (1962b, 1963), GARLICK (1966), and TAYLOR (1968a).
(From TAYLOR, 1968a)
Table 9. Oxygen isotope "temperatures" of some mineral pairs from various
igneous rocks analyzed by TAYLOR and EPSTEIN (1962a), GARLICK (1966), TAYLOR
-(l968a) and ANDERSON et al. (1971)
Sample
Quartzmagnetite
magnetite
magnetite
biotite
Alkali basalt, Kilauea,
1060
Hawaii
Alkali basalt, Kilauea Iki,
1030
Hawaii
Trachyte, Tenerife
810
765
Skaergaard gabbro
940
920
Kiglapait gabbro
850
835
Duke Island gabbro
770
790
Nain anorthosite
695
950
Lac St. Jean anorthosite
1050
San Jose tonalite
650
665
670
Woodson Mt. granodiorite
610
670
595
Rubidoux leucogranite
615
665
895
Lassen dacite
990
1040
1305
Horse Mesa rhyolite
750
805
745
Rhyolite ignimbrite,
860
Taupo, New Zealand