The Intrusive Suite of Sonora Pass (also, the Sonora Pass Intrusive Suite) is one of several intrusive suites in Yosemite National Park. These also include
- Fine Gold Intrusive Suite
- Intrusive Suite of Buena Vista Crest
- Intrusive Suite of Jack Main Canyon
- Intrusive Suite of Merced Peak
- Intrusive Suite of Yosemite Valley
- Tuolumne Intrusive Suite
| Intrusive Suite of Sonora Pass | |
|---|---|
| Stratigraphic range: Late Cretaceous, | |
| Type | Suite |
| Location | |
| Region | Yosemite National Park |
| Country | United States |
| Type section | |
| Named for | Sonora Pass |
 The Intrusive Suite of Sonora Pass is visible, in light red | |
The Intrusive Suite of Sonora Pass is ~92-89 Ma, and is the northernmost of four large Late Cretaceous zoned intrusive suites in the central Sierra Nevada batholith.[1]
Rock types
editOn a large scale, it is composed of Kinney Lakes granodiorite and the younger Topaz Lake granodiorite.[2]
On a finer scale, the Intrusive Suite of Sonora Pass is made of light-gray, coarse-grained biotite granodiorite, plus granite with roughly equant, well-formed potassium feldspar phenocrysts composing about 2–10% of the rock. Quartz usually occurs in clots of 0.5 centimetres (0.20 in). The mafic mineral content is about 10%.[3]
References
edit- ^ Leopold, Monika (May 2014). "Structure and Construction of the Cretaceous Sonora Pass Intrusive Suite, a large zoned intrusion of the Sierra Nevada Batholith, California". gsa.confex.com. Retrieved 8 January 2019.
- ^ Leopold, Monika B. (2016). "Structure, Construction, and Emplacement of the Late Cretaceous Sonora Pass Intrusive Suite: Central Sierra Nevada Batholith, California".
- ^ Graham, J. (2012). "Yosemite National Park: Geologic resources inventory report. Natural Resource Report NPS/NRSS/GRD/NRR" (PDF). National Park Service, Fort Collins, Colorado. Retrieved 8 January 2019.
External links
edit
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