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520
Lower Head Formation Major Elements (conI.)
Element PORT B2 WBN 6 WBN A3 WBN A15
Grainsite tuh·tu trSln~rs
Slrutture mu. mu.
SiOI 75.31 76.63 7S.51 i9.71
TiOt 0.3-1 0.-19 0.-19 0.37
AItOl 6.78 8.83 9.09 7.02
FeIO) 2.-\.6 ·1.07 -1.50 3.-18
MnO 0.11 om 0.07 0.05
UgO 1.90 3.55 3.311 2.85
C.O 9.72 2.85 3.-12 3.79
NatO 1.8-1 1.66 1.63 1.37
K,O 1.52 1.83 1.86 1.32
PtO. 0.02 0.02 0.02 0.02
LOI 8.53 -1.66 -1.79 4.65
TOTAL 99.18 99.82 ICO.17 100.02
al·alk 5.90 13.5-1 13.59 12.30
Nig Ti l.22 2.07 1.99 1.73
Nig Fm 13.90 29.90 27.53 26.87
Nig K 0.35 0.42 0.43 0.39
NigMg 0.59 0.63 0.59 O.GI
Nig Si 358.40 -127.78 -105.81 -198.75
Fel0l~MgO 4.35 7.62 i.90 6.33
Al,Ol/SiOI 0.09 0.12 0.12 0.U9
KIO/NaIO 0.83 1.10 1.1-1 0.96
AIIOl/(CaO-NatO) 0.59 L96 1.80 1.36