Alkalic Porphyry Cu-Au

 

An Interactive Poster

Alkalic_Porphyry2
D18-03_macro_scale_rotate

Biotite hornfelsed siltstone

dark purply-brown; bedded; very fine grained; chlorite as patches and irregular, discontinuous veinlets with bleached envelopes

S5-10_macro

Tuffaceous argillite

well bedded; alternating grey, black and buff beds on mm to cm scale; very fine grained. Commonly interbedded with green tuff and volcanic breccia, clear evidence of submarine origin

D5-09_macro_scale

Andesite

pale mottled green; primary feldspar altered to calcite; mafics altered to chlorite and epidote; veinlets of chlorite-epidote-calcite; pyrite-chalcopyrite fracture veinlets

D18-07_macro_scale

Hydrothermal K-feldspar vein

Andesite wallrock to 6 cm wide vein of pink K-feldspar, biotite, quartz, epidote and interstitial calcite
D4-05_macro_scale

Albitized diorite

D5-05_macro_2_scale

Sulphide ore in "orange" diorite (hypogene)

mottled pink-grey-green; medium grained; alteration includes pervasive K-feldspar and calcite, minor epidote and chlorite; sooty black chalcocite and minor metallic chalcocite as irregular veinlet
D5-01_macro_scale

Diorite breccia, strong epidote-hematite alteration

Ironmask batholith; mottled green (epidote) and deep purple-red (hematite); breccia fragments to 3 cm typical of magnetite veins in the batholith; little original texture preserved; weakly magnetic, primary magnetite converted to hematite

D4-06_macro_scale

Diorite breccia, strong epidote-hematite alteration

Ironmask batholith; mottled green (epidote) and deep purple-red (hematite); breccia fragments to 3 cm typical of magnetite veins in the batholith; little original texture preserved; weakly magnetic, primary magnetite converted to hematit
D18-10_macro_scale

Altered hornfels argillite(?)

light grey; hard; siliceous; relict breccia texture strongly overprinted by pervasive alteration and indistinct to clear veins of fine grained silica; minor K-spar alteration; some preserved biotite (or chlorite after biotite) remaining of hornfels. Interpreted to be argillite hornfels strongly overprinted by hydrothermal alteration

D5-04_macro_2_scale

Chalcocite ore in diorite, brecciated and altered (supergene zone)

pale orange-brown, fine grained; some diorite texture preserved; alteration to chlorite, epidote, hematite, blebs and veinlets of K-feldspar; 0.5% chalcopyrite is fringed by 10% chalcocite; late calcite veins have recrystallized chalcocite, changing its sooty black appearance to lustrous metallic grey

D18-01_macro_scale

Mafic volcanic

dark green; massive; fragmental texture is weakly visible, possibly due to hornfels overprint

S5-17_macro_scale

Takla Group

S5-18_macro_scale

Takla Group

Fossils

D5-06_macro_scale

Andesite

black; fine grained; strongly magnetic; 15-20% chalcopyrite

P1-18_thumb

Page Sponsors