GRD0022S0 - Geological Teaching Collection at Scripps

Record #8 of 74
GRD0019S0 GRD0036S0

IGSN:

GRD0022S0

Sample ID:

I-77

Sample Type:

Granodiorite

Sample Age:

Mesozoic › Cretaceous › Late Cretaceous › Coniacian
85.8 - 89.3

Number TS:

Storage:

Ritter 154 › Cabinet 15 › Drawer O

Modifiers:

coarse grained,Myrmekite

Notes:

Large plagioclase, k-spar, and hornblende in hand sample

Ancillary Data Notes:

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.

Series:

Location:

California
Whitney Portal, Cathedral Peak
Latitude: 37.85°
Longitude: -119.4°

Photos:

Notes:

Micrographs:

Notes:

Biotite with large k-spar and quartz. Slight alteration.

Mag:

2.5

Polarized:

plane

Notes:

Biotite with large k-spar and quartz. Quartz with undulose extinction.

Mag:

2.5

Polarized:

crossed

Notes:

Mag:

scan

Polarized:

crossed

Thin Sections:

GRD0022T0: plag, quartz, Kspar (perthitic in places), biotite, amphibole, some sphene, myrmekite texture, moderately altered

Documents:

N/A

References:

N/A

Geological Teaching Collection

Geological Teaching Collection

IGSN: GRD0022S0 Sample ID: I-77 Permalink