USGS Professional Paper 1697 - Alaska Resources Library

Table 3—Continued
Metallogenic Belt Major Mineral Deposits Types.
Environment and
Tectonic Event and
(Abbreviation) (Signifi cant Mineral Deposits)
Host Unit
Comments
Southern Alaska (SA) Porphyry Cu, porphyry Cu-Au,
Continental-margin arc. Subduction-related granitic plutonism that formed the Kluane continental-
polymetallic vein, Ag-Au skarn, Cu- Alaska Range-Talkeetna
margin arc.
Au-Ag skarn.
(Kijik River, Golden Zone, Nabesna
River).
Mountains igneous belt.
Metallogenic Belts Formed During Early Tertiary Spreading Along Kula-Farallon Oceanic Ridge, Southern and Southeastern Alaska
Prince William Sound Besshi massive sulfi de, Cyprus massive Oceanic ridge.
Sea-fl oor spreading along Kula-Farallon oceanic ridge.
(PW)
sulfi de.
(Beatson (Latouche), Copper Bullion
(Rua Cove), Ellamar, Fidalgo-Alaska)
Prince William terrane.
Yakobi (YK) Gabbroic Ni-Cu
Oceanic ridge.
Intrusion of mafi c-ultramafi c plutons during oblique subduction of Kula-
(Bohemia Basin, Brady Glacier, Mirror Mafi c-ultramafi c plutons
Farallon oceanic ridge under margin of southeastern Alaska.
Harbour, Mt. Fairweather)
intruding Chugach terrane.
Metallogenic Belts Formed During Early Tertiary Oblique Subduction of Kula-Farallon Oceanic Ridge Under Margin of Southern and Southeastern Alaska
Maclaren (MC) Au quartz vein.
Extensional.
Oblique subduction of Kula-Farallon oceanic ridge under margin of
(Lucky Hill and Timberline Creek) Veins in low-grade part of
Maclaren Glacier metamorphic
belt.
southern Alaska.
Talkeetna Mountains Au quartz vein
Extensional.
Oblique subduction of Kula-Farallon oceanic ridge under margin of
(TM)
(Independence)
Veins in low-grade part of
Talkeetna Formation..
southern Alaska.
Chugach Mountains Au quartz vein.
Extensional.
Oblique subduction of Kula-Farallon oceanic ridge under margin of
(CM)
(Cliff, Alaska Oracle, Crown Point, & Veins in Valdez Group, Chugach southern Alaska.
others)
terrane.
Baranof (BN) Au quartz vein.
Extensional.
Oblique subduction of Kula-Farallon oceanic ridge under margin of
(Chichagoff, Hirst-Chichagof, Bauer, Veins in Valdez Group, Chugach southeastern Alaska.
Silver Bay, and others)
terrane.
Juneau (JU) Au quartz vein.
Extensional.
Oblique subduction of Kula-Farallon oceanic ridge under margin of
(Jualin, Kensington, Alaska-Juneau, Veins in foliated tonalite sill southeastern Alaska.
Treadwell, Sundum Chief, Gold
between Wrangellia and
Standard, & others)
Stikinia terranes.
Metallogenic Belts Formed in Late Cretaceous and Early Tertiary Coast Continental-Margin Arc, Southeastern Alaska, and Southern Canadian Cordillera
Surprise Lake (SL) Porphyry Mo-Cu, Au-Ag polymetallic Continental-margin arc. Subduction-related granitic plutonism that formed the Coast continental-
vein.
Coast-North Cascade plutonic margin arc.
(Mount Ogden, Red Mountain, Adanac-
Adera, Boswell River, & others)
belt.
Central-southeastern Porphyry Mo, porphyry Cu.
Continental-margin arc. Subduction-related granitic plutonism that formed the Coast continental-
Alaska (CSE) (Margerie Glacier, Nunatak, Groundhog Coast-North Cascade plutonic margin arc.
Basin, Quartz Hill)
belt.
Appendix 363