Where is Garnetiferous Granite found?
Granite (igneous rock) with Almandine Garnet (mineral)
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Open the appGarnetiferous Granite 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 Garnetiferous Granite
Himalayan Orogen
Granites with abundant almandine garnet are common in the High Himalayan Crystalline Series, formed from the anatexis of metasedimentary rocks during the collision of the Indian and Eurasian plates.
Appalachian Mountains, USA
Various granitic intrusions within the Appalachian orogen, particularly in New England and the Piedmont region, contain almandine garnet, reflecting their origin from metasedimentary protoliths.
Fennoscandian Shield, Scandinavia
Several Proterozoic granitic bodies, especially S-type granites, contain almandine garnet, indicative of crustal melting processes.
Western Cordillera, North America
Some granitic plutons associated with subduction-related magmatism and crustal thickening in regions like the Sierra Nevada batholith can contain accessory garnet.
Eastern Australia
Peraluminous granites with almandine garnet are found in various Paleozoic orogenic belts, such as the Lachlan Fold Belt.
Collecting tips
- Look for Orogenic Belts. Garnet-bearing granites are frequently found in regions that have undergone significant continental collision or subduction-related mountain building, where crustal melting of metasedimentary rocks is common.
- Identify Peraluminous Granites. While chemical analysis is definitive, field indicators for peraluminous granites (which often host garnet) include the presence of muscovite, tourmaline, and sometimes cordierite, in addition to garnet.
- Examine Outcrops for Red Crystals. Scan exposed rock faces, especially in road cuts, quarries, or glaciated terrains, for distinctive dark red to reddish-brown, often well-formed, isometric crystals embedded within a lighter-colored granitic matrix.
- Check for Metasedimentary Protoliths. In areas where granites intrude or are spatially associated with high-grade metasedimentary rocks (e.g., schists, gneisses derived from shales), the likelihood of finding garnet-bearing granites increases.
Quick Check
- Color:
- Granite matrix: white, gray, pink, or red. Garnet: dark red, reddish-brown, purplish-red.
- Luster:
- Vitreous to subvitreous for quartz/feldspar, pearly for mica, vitreous to resinous for garnet.
- Streak:
- White (for granite minerals); Garnet: white to colorless (though typically not powdered for streak test).
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