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Ministry of Energy Mines and Responsible for Core Review

103G Geological Legend

 

Hecate Strait

STRATIFIED ROCKS

QUATERNARY
     PLEISTOCENE AND RECENT

Q

Non-marine and marine sand, glacial deposits.
TERTIARY
    EOCENE TO PLIOCENE
          MASSET FORMATION

TM

Subaerial basalt flows and breccia, rhyolite ash flows, lesser dacite.
CRETACEOUS
   QUEEN CHARLOTTE GROUP
       UPPER CRETACEOUS
          HONNA FORMATION

uKHo

Conglomerate, sandstone, minor shale
LOWER CRETACEOUS
         HAIDA FORMATION

KH

Sandstone. shale.
UPPER JURASSIC - LOWER CRETACEOUS

          LONGARM FORMATION

uJIKL

Sandstone (Feldspar-lithic wacke, conglomerate and pebbly sandstone), shale (shale, concretionary shale, minor sandstone).
JURASSIC
     MIDDLE JURASSIC
   MORESBY GROUP (UNDIVIDED)

mJM

Sandstone, conglomerate.
   YAKOUN GROUP (UNDIVIDED)

mJY

Sandstone, breccia, tuff, phyric and aphyric andesitic to basaltic flows, conglomerate.
TRIASSIC AND JURASSIC

TJV

Metavolcanic rocks.
UPPER TRIASSIC TO LOWER JURASSIC
   KUNGA GROUP (UNDIVIDED)

uTlJK

Massive grey limestone, flaggy black limestone, flaggy black argillite.
          SANDILANDS FORMATION

uTlJK

Fine-grained sandstone, limestone, tuffaceous sandstone.
UPPER TRIASSIC
          SADLER AND PERIL FORMATION (UNDIVIDED)

uTSP

Massive grey limestone, medium to thin bedded black to grey limestone.
          SADLER FORMATION

uTS

Massive grey limestone.
   VANCOUVER GROUP
         KARMUTSEN FORMATION

uTK

Massive basalt flows, minor breccia, tuff, limestone and argillite.
PALEOZOIC

Pq

Quartzite.

Pc

Limestone, quartzite, schist.

Psc

Crystalline limestone

Psn

Metasediments, amphibolite schist, gneiss of garnet sillimanite grade.

PLUTONIC ROCKS

EOCENE AND OLIGOCENE

     KANO PLUTONIC SUITE (U-Pb: 165 Ma; 145- 164 Ma)

TK

Hornblende-biotite quartz monzodiorite, biotite granite, biotite-hornblende quartz diorite, hornblende gabbro.

MIDDLE JURASSIC

     BURNABY ISLAND PLUTONIC SUITE (U-Pb: 165-168 Ma; 144-164 Ma)

JB

Medium grained, equigranular, intensely veined biotite hornblende quartz monzodiorite; hornblende - biotite quartz monzonite; (muscovite) biotite trondhjemit; hornblende gabbro and diorite.

AGE UNKNOWN

      COAST PLUTONIC COMPLEX

qm

Quartz monzonite.

gd

Granodiorile.

gd-b

Biolite granodiorite.

qd

Quartz diorite.

di

Diorite.

din

Foliated to gneissic diorite, migmatite, amphibolite.

b

Gabbro-diorite migmalite complex.
Geological legend and base derived from:

Anderson, R.G. and Reichenbach, I. (1991): U-Pb and K-Ar Framework for Middle to Late Jurassic and Tertiary Plutons in the Queen Charlotte Islands, British Columbia; in Evolution and Hydrocarbon Potential of the Queen Charlotte Basin, British Columbia, Geological Survey of Canada, Paper 90-10, pp. 59-7.

Anderson, R.G. and Greig, C.J. (1989): Jurassic and Tertiary Plutonism in the Queen Charlotte Islands, British Columbia; Geological Survey of Canada, Paper 89-11H.

Haggart, J.W. (1992): Progress in Jurassic & Cretaceous Stratigraphy, Queen Charlotte Islands, British Columbia, in Current Research, Part A; Geological Survey of Canada, Paper 92-1A, pp. 361-365.

Hesthammer, J., Indrelio, J., Lewis, P.D. and Haggart, J.W. (1991): Geology of southern Graham Island (map sheets 103 F/8 and 103 G/5, and parts of map sheets 103 F/7 and 103 F/9), Queen Charlotte Islands, British Columbia, Geological Survey of Canada, Open File 2319.

Hutchison, W.W., Berg, H.C. and Okulitch, A.V. (compilers)(1979): Skeena River; Geological Survey of Canada, Map 1385A, 1:1,000,000.

Roddick, J.A. (1970): Douglas Channel-Hecate Strait Map-Area British Columbia; Geological Survey of Canada, Paper 70-41.

Sutherland Brown, A. (1968): Geology of the Queen Charlotte Islands. British Columbia; Figure 5, 1: 125,000; Energy, Mines and Petroleum Resources, Bulletin 54.

Thompson, R.I. (compiler)(1989): Preliminary draft legend of the Queen Charlotte Islands; Geological Survey of Canada.

See Hecate Strait (103G) Summary Sheet for an overviews of the map areas and additional regional references.

Positions of all geological contacts are approximate. In the case of an apparent disagreement between an occurrence’s geological location on the map and its stratigraphic setting given in the MINFILE documentation, the latter should be given priority.