- Usage in publication:
-
- Silver Point Quartz Monzonite*
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartz monzonite
- AAPG geologic province:
-
- Okanogan province
Summary:
Unit is named the Silver Point Quartz Monzonite. Consists of porphyritic hornblende-biotite quartz monzonite forming a large pluton. Intrudes the Wallace and older formations of the Belt Series; in contact with unnamed plutonic rocks of the Loon Lake batholith; almost all contacts are concealed. Age is Mesozoic(?). (B1520)
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Silver Point Quartz Monzonite*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- Okanogan province
Summary:
Age of the Silver Point Quartz Monzonite is modified from Mesozoic(?) to Tertiary based on radiometric (K-Ar) ages of 46.8 +/-1.7 Ma and 51.0 +/-5 Ma (both hornblende) and 46.7 +/-1.3 Ma and 48.1 +/-1 Ma (both biotite).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Silver Point Quartz Monzonite*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- Okanogan province
Summary:
Age of the Silver Point Quartz Monzonite is modified from Tertiary to Eocene based on radiometric (K-Ar) ages of 60 +/-2 Ma (hornblende) and 50 +/-1 (biotite).
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 ([ ]).