Intrusive Suite of Sonora Pass

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

  1. Fine Gold Intrusive Suite
  2. Intrusive Suite of Buena Vista Crest
  3. Intrusive Suite of Jack Main Canyon
  4. Intrusive Suite of Merced Peak
  5. Intrusive Suite of Yosemite Valley
  6. Tuolumne Intrusive Suite
The Intrusive Suite of Sonora Pass is visible, in light red, some outside Yosemite National Park

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]

What rocks compose the Intrusive Suite of Sonora Pass

On 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
  1. 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.
  2. Leopold, Monika B. (2016). "Structure, Construction, and Emplacement of the Late Cretaceous Sonora Pass Intrusive Suite: Central Sierra Nevada Batholith, California".
  3. 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.
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