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  • noun

Synonyms for hornfels

a fine-grained metamorphic rock formed by the action of heat on clay rocks


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References in periodicals archive ?
25 km east of the Prince of Wales target, a significant zone of sulphide bearing biotite hornfels within Knob Hill Formation sediments was intersected adjacent to an intensely propylitic altered diorite in drillhole 10CM06, yielding 0.
The majority of tools in the Booroola 3 assemblage were made on silcrete (46 percent), followed by hornfels (36 percent) and crystal quartz (18 percent).
Immediately above the basal contact at Chain Rock no continuous beds are visible in the hornfels.
Company geologists were able to access the contact zone between the MacAdam Intrusive and the Hornfels at the eastern side of the newly uncovered glacial valley.
0x20 The gold mineralization occurs as quartz-arsenopyrite-pyrite-chalcopyrite veins in quartz monzonite and hornfels and as silicification with disseminated arsenopyrite in quartz monzonite.
Most stones of the region are penetrative granite, metamorphic schist and Hornfels and Fourth period alluvium.
Twin Bonanza consists of multiple targets and early stage discoveries including Old Pirate, Old Pirate South, TB Hornfels and the bulk tonnage Buccaneer Porphyry Zone.
Hornfels is not a common rock-type within England and Wales but exposures are known surrounding the granite outcrops of Devon and Cornwall where Devonian-Lower Carboniferous sediments have been baked by the Cornubian batholith.
4km in area remain open to the northwest and southeast, coincident with outcropping coarse grained porphyritic intrusive rocks and overlying zones of mineralized hornfels.
The drill rig has now moved to the Buccaneer Porphyry Prospect and TB Hornfels Prospect where ABM Resources is completing an initial 10 holes before returning to the Old Pirate and the Old Pirate South Prospects.
Biotite hornfels is developed locally in the contact zone near Lake Utopia, and equigranular to porphyritic microgranite is common along the southern contact of the granite, consistent with the intrusive relationship (McLeod 1990).
The tools are made predominantly of hornfels and dolerite, but there are a few quartz pieces.
5 m zone of elevated copper values within hornfels altered intermediate volcanic rocks.
0x20 These structures are being carefully sampled to determine if one of them was the pathway along which mineralizing fluids escaped from beneath the hornfels into the upper, manto-hosting limestone units.
Hornfels and skarn developed mainly in Cambrian units indicate the presence of unexposed plutons in the Blue Mountain area (location "m", Fig.