Where is Granodiorite found?
Granodiorite
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Open the appGranodiorite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Granodiorite
Sierra Nevada Batholith, USA
A vast intrusive complex in California, largely composed of granodiorite and related granitoids, formed during Mesozoic subduction.
Andes Mountains, South America
Extensive granodioritic intrusions are found throughout the Andean Cordillera, related to ongoing subduction along the western margin of South America.
Coastal Batholith of Peru
A major Mesozoic-Cenozoic batholith dominated by granodiorite and tonalite, representing a classic example of arc magmatism.
British Columbia, Canada
Numerous granodioritic plutons are present in the Coast Mountains and other ranges, part of the Cordilleran orogen.
Fennoscandian Shield, Europe
Ancient granodioritic intrusions are found in the Precambrian shield areas of Scandinavia and Finland.
Collecting tips
- Look for large exposures. Granodiorite typically forms large intrusive bodies (batholiths, stocks), so look for extensive outcrops in mountainous regions or areas with significant erosion.
- Examine mineral composition. Distinguish from granite by observing a higher proportion of plagioclase (often white to gray) compared to potassium feldspar (often pinkish). Quartz (glassy gray) and dark biotite/hornblende should also be visible.
- Check for associated rocks. Granodiorite often occurs with other granitoids (granite, tonalite, diorite) and sometimes with volcanic rocks of similar composition (dacite, andesite) in arc settings.
- Consider the geological context. Its presence often indicates past or present subduction-related magmatism, so search in areas known for ancient or active continental margins.
Quick Check
- Color:
- Light gray to grayish-white, speckled
- Luster:
- Vitreous to sub-vitreous
- Streak:
- White (due to feldspars and quartz)
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