- Usage in publication:
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- Iron Mountains Intrusive Suite*
- Modifications:
-
- Named
- Dominant lithology:
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- Granite
- Granodiorite gneiss
- AAPG geologic province:
-
- Mojave basin
Summary:
Unit is named the Iron Mountains Intrusive Suite for the Iron Mountains in the southeastern part of the quad. Consists of Danby Lake Granite Gneiss (new), Granite Pass Granite (new), Iron Granodiorite Gneiss (new), and an unnamed garnet aplite unit. Is widely exposed in the Iron and Granite Mountains. Similar in age, composition, and texture to the Coxcomb Intrusive Suite (new) and rocks of the Old Woman-Piute Range batholith. Age is Late Cretaceous (about 70 Ma) based on isotopic (K-Ar; muscovite, U-Pb; zircon) dating (Miller and Howard, 1985; Wright and others, 1987).
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 ([ ]).