- Usage in publication:
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- Dog Wash Gneiss*
- Modifications:
-
- Named
- AAPG geologic province:
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- Mojave basin
Summary:
Dog Wash Gneiss. Light-buff-weathering, medium-grained leucogranite (leucomonzogranite to leucosyenogranite) gneiss, locally trondhjemitic. Color index 0.5 to 6. Contains allanite, clotted chlorite, muscovite, oxides, and biotite. Quartz streaks separate streaks of intergrown alkali feldspar and plagioclase; possibly the streaks originated from coarse grains of quartz and perthite in the protolith. Intrudes the Pinto Gneiss of Miller (1938) (part) (Xp) and the diorite and amphibolite unit (Xd). Minimum age 1.68 Ga (U-Pb on zircon) (Wooden and others, 1991). Rocks previously mapped as part of the Palms Granite by Evans (1964) and as part of undifferentiated Mesozoic plutonic rocks by Powell (1981). Age is Early Proterozoic.
Type locality: in Pinto Mountains on the west side of Twentynine Palms Mountain along upper Dog Wash, in sec. 19 (unsurveyed), T. 1 S., R. 10 E., Valley Mountain 15-min quadrangle and Twentynine Palms 7.5-min quadrangle.
Named from Dog Wash, located in the southwestern part of the quadrangle.
Source: Publication.
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 ([ ]).