- Usage in publication:
-
- Sage Hen Adamellite
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartz monzonite
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
[Probably named for Sage Hen Flat, White Mountains area]. Underlies about 0.5 SW mi of Mt. Barcroft 15' quad and extends south of quad. Total area is about 5 sq mi. Is similar to McAfee Adamellite (new). Intrudes sedimentary rocks. The four adamellites --Sage Hen, Cottonwood, Leidy, and McAfee (all new) --correspond in area to Boundary Peak Granite (Anderson, 1937).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Sage Hen Adamellite
- Modifications:
-
- Not used
- Geochronologic dating
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
Mapped as "quartz monzonite of Sage Hen Flat" which is same as Sage Hen Adamellite of Emerson (1966). Described as medium-grained biotite-hornblende quartz monzonite. Northern edge of Sage Hen pluton of Nelson (1966) is 138 to 130 Ma (McKee and Nash, 1937). Map shows Cretaceous age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Sage Hen Adamellite
- Modifications:
-
- Not used
- Geochronologic dating
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
Sage Hen Adamellite of Emerson (1966) is mapped as "granite of Sage Hen Flat. Forms small zoned pluton that is entirely surrounded by Late Proterozoic and Cambrian strata. Modes plot close to boundary between granodiorite and granite fields on Q-A-P diagram. Gillespie (1979) reported U-Pb age on zircon of 144 Ma and Crowder and others (1973) reported K-Ar age of 133 Ma on biotite and 141 Ma on hornblende. Assigned Late Jurassic age on map.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).