GRD0022S0
I-77
Granodiorite
Mesozoic › Cretaceous › Late Cretaceous › Coniacian
85.8
-
89.3
1
Ritter 154 › Cabinet 15 › Drawer O
Myrmekite,coarse grained
Large plagioclase, k-spar, and hornblende in hand sample
Age from Coleman, D., 2004, Rethinking the emplacement and evolution of zoned plutons: Geochronologic evidence for incremental assembly of the Tuolumne Intrustive Suite, California: Geology (2004) 32 (5): 433-436.
-
California
Whitney Portal, Cathedral Peak
Latitude: 37.85°
Longitude: -119.4°
-
Biotite with large k-spar and quartz. Slight alteration.
2.5
plane
Biotite with large k-spar and quartz. Quartz with undulose extinction.
2.5
crossed
-
scan
crossed
GRD0022T0: plag, quartz, Kspar (perthitic in places), biotite, amphibole, some sphene, myrmekite texture, moderately altered
N/A
N/A