HORNFELS: CONTACT METAMORPHISM OF FINE-GRAINED SEDIMENTS-SHALE-ARGILLITE-SLATE-HORNFELS
An Interactive Poster
Tombstonite
Salt and pepper granitic: formally a biotite hornblende quartz granodiorite.
Tombstonite
Salt and pepper granitic: formally a biotite hornblende quartz monzonite.
Black argillite
Finely bedded sediment. Outside of the hornfels influence.
Biotite hornfels with quartz vein stockwork
Dark patches of the rock are relicts of biotite hornfels, (high temperature) being altered\replaced by a hard, white bleached rock that represents the movement through the rock of hydrothermal fluid that is sufficient to destroy the original hornfels and then be cut by veinlets. This is a rock that if found should be given serious consideration as to what else may be in the area.
Hornfels
inner hornfels, the brown purplish colour is suggestive of biotite hornfels, high temperature, nearness to intrusive. Sample is hard, brittle with good conchoidal fracture, typical of well developed hornfels.
Bedded hornfels
Thin bedded fine sandstone and silty argillite. Sheen and brownish colour indicate biotite
Black argillite hornfels
Strong hornfels, massive, conchoidal fractured, no bedding. Fine fractures of ‘bleached’ veinlets and silica suggest presence hydrothermal fluids
Molybdenum
The Kitsault Moly mine was discovered by a prospector who recognized hornfels and knew of its possible importance for where mineralization might be.
Check out: https://theprospectornews.com/avanti-mining-commences-construction-at-the-kitsault-project/
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