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Ministry of Energy Mines and Responsible for Core Review

082ESW Geolgical Legend

 

LAYERED ROCKS

QUATERNARY

Qal

Unconsolidated glacial, fluvial and alluvial deposits

TERTIARY

MIOCENE TO PLIOCENE

Mo

Olalla Rhyolite: rhyolite breccia, obsidian and related dikes

EOCENE

EP

PENTICTON GROUP: Undivided mixed alkalic and calcalkaline trans-tensional volcanics and associated fluvial and lacustrine sediments

Included in legend but NOT shown on map (except (Esb) Springbrook and (Epwl) White Lake formations):

EPs

Skaha Formation: mostly chert and greenstone slide breccia, some tephrite lava; overlain by polymictic fanglomerate

EPwl

White Lake Formation: interdigitated volcanic sandstone and conglomerate with feldspar porphyry lavas, lahars, pyroclastic rocks and volcanic breccias

EPma

Marama Formation: flow banded dacite, breccia; mainly lava domes

EPmr

Marron Formation: undivided Park Rill, Nimpit Lake, Kearns Creek, Kitley Lake and Yellow Lake members; merocrystalline andesitic lava, tan trachyte and trachyandesite lava with up to 10 per cent plagioclase glomerophenocrysts in a finely crystalline matrix, pyroxene-rich rhomb-porphyry and mafic phonolite lava and minor breccia; Kitley Lake Member is 51.6 +/- 1.8 Ma, K-Ar (biotite)

Esb

Springbrook Formation: discontinuous, basal, polymictic conglomerate and breccia; derived from underlying upper Paleozoic and older basement rocks

Egn

Okanagan Gneiss: massive, medium grey weathering, resistant hornblende biotite granodiorite orthogneiss: strongly foliated, grades to mylonitic gneiss, mylonite and blastomylonite; minor amphibolite, paragneiss, schist, pegmatite and aplite: strongly chloritized along the Okanagan Valley fault; includes (Eg) hornblende granodiorite: massive, resistant, grey weathering, coarse grained, equigranular, mesocratic with euhedral fresh black hornblende crystals; includes granite and granodiorite gneiss with pegmatite veins and sills; 52.3 +/- 1.4 Ma, K-Ar (hornblende)

UPPER TRIASSIC

uTrv

Island-arc derived mafic lavas, volcaniclastics, comagmatic intrusions; includes undifferentiated greenstone lenses; includes Rossland Group

uTrN

NICOLA GROUP: Island-arc derived mafic lavas, volcaniclastics, comagmatic intrusions; rusty weathering black pyritic slate, phyllite and argillite, locally silicified or ‘cherty’; minor quartzite, minor interbedded argillaceous limestone

CARBONIFEROUS TO TRIASSIC

CTrot

Old Tom Formation: massive andesitic greenstone and greenstone breccia; locally includes large, extensive, strongly silicified equivalents in irregular bodies and lenses with gradational boundaries; undifferentiated limestone; minor diorite

CTrs

Shoemaker Formation: massive, greyish green silicified volcanic rocks: includes ‘cherty’ tuff and breccia, undifferentiated

CTri

Independence Formation: massive greenstone - volcanic breccia with greenstone fragments: includes large undifferentiated silicified lenses and limestone

NOTE: The above units (CTrot, CTrs, CTri) have been informally referred to regionally as the Apex Mountain Group containing five major lithofacies: massive and bedded chert, greenstone, chert breccia, argillite and limestone.

CARBONIFEROUS TO PERMIAN

CPA

ANARCHIST GROUP: Dark grey weathering, recessive amphibolite, greenstone, quartz chlorite schist, quartz biotite schist, (um) minor serpentinized peridotite or dunite

Pw

Wallace Formation: metamorphosed andesitic tuffs and lavas, intrusions, hornfels and minor limestone; correlated with the upper (Permian) part of the Anarchist Group

CPK

KOBAU GROUP: Undivided amphibolite, green schist, quartzite, mica schist, greenstone and minor marble: strongly foliated and penetrative flaser fabrics

CPB

BARSLOW ASSEMBLAGE: Undivided thin bedded, brown, silty slate and argillaceous siltstone; lacks penetrative fabric; lower greenschist facies metamorphism

PROTEROZOIC TO (?) LOWER PALEOZOIC

PMgf

Grand Forks and Monashee Gneiss: undifferentiated: includes grey, massive, biotite granite gneiss; layered paragneiss; schist; quartzite; calcsilicate gneiss; amphibolite; carbonatite; marble; pegmatite and amphibolite

 

INTRUSIVE ROCKS

TERTIARY

EOCENE

Ec

Undifferentiated Coryell-related intrusions: alkalic to calcalkaline, high level, syenite, monzonite and shonkinite: includes (Eal) Allendale Lake stock, porphyritic biotite pyroxene monzonite, syenite, shonkinite, 51.7 +/- 1.8 Ma, K-Ar (biotite)

Esc

SHINGLE CREEK PORPHYRY: quartz feldspar porphyry stock: includes (Etc) Tuzo Creek (porphyry) stock, quartz-albite-sanidine porphyry, 49.5 +/- 2 Ma, K-Ar (biotite); (Ebp) Beaverdell porphyry, massive, lightly jointed, porphyritic granite, distinctive pink orthoclase phenocrysts up to 6 centimetres long, 49.4 +/- 0.7 Ma, K-Ar (biotite); and (Eec) Eugene Creek stock, 54.5 +/- 1.9 Ma, K-Ar (biotite); plutonic equivalent of the Marron Formation, especially (Ek) the Kettle River Formation

CRETACEOUS AND/OR TERTIARY

KTo

OKANAGAN BATHOLITH and satellite stocks: massive, light grey weathering, medium to coarse grained, equigranular to porphyritic, unfoliated to weakly foliated, fresh biotite granodiorite and granite

JURASSIC AND/OR CRETACEOUS

JKf

Fairview Granodiorite: massive, pink to light brown weathering, medium to coarse grained, unfoliated to weakly foliated, fresh granodiorite; 111 +/- 5 Ma minimum, K-Ar (biotite)

JURASSIC

Jos

OSOYOOS PLUTON: synkinematic quartz monzonite intrusion at Anarchist Mountain and west of Osoyoos: medium grained, hypidiomorphic granular, biotite hornblende quartz monzonite, 170 Ma, Rb-Sr; pink weathering, leucocratic, foliated quartz monzonite with a medium grained, hypidiomorphic granular texture characterized by small pink garnets and poikilitic muscovite flakes, 140 Ma, Rb-Sr; medium to coarse grained, hypidiomorphic granular or occasional porphyritic biotite quartz monzonite with a weakly developed foliation, 135 Ma, Rb-Sr

Jol

OLIVER PLUTONIC COMPLEX: massive, unfoliated, medium grained, porphyritic biotite granite with weakly foliated hornblende granodiorite along the southern border; also includes biotite hornblende diorite, agmatite, massive garnet muscovite granite, porphyritic quartz monzonite and syenite phases; 152 +/- 3 Ma, U-Pb (zircon)

Jk

KRUGER ALKALIC COMPLEX: interpreted as a younger border phase of the Similkameen batholith, potassium feldspar porphyritic diorite, syenite and nepheline syenite, 139, 152 +/- 8 Ma (pyroxene-hornblende mix) and 171 +/-6.4 Ma, K-Ar (hornblende)

Jwk

WESTKETTLE BATHOLITH: equigranular biotite hornblende granodiorite to quartz diorite; intensely chloritized mafics; age based on correlation with the Nelson batholith

MIDDLE JURASSIC

mJn

Undifferentiated intrusions correlated with the Nelson batholith: porphyritic granite, granodiorite

mJs

SIMILKAMEEN BATHOLITHIC COMPLEX: massive, medium grained biotite hornblende granodiorite; 171 +/- 6 Ma, K-Ar (hornblende); includes several satellite stocks referred to as Osoyoos and Testalinden granodiorite

mJol

OLALLA ALKALIC COMPLEX: magnetite-bearing pyroxenite border phase with a diorite and fine grained syenite core; 179 Ma, K-Ar

mJok

OKANAGAN BATHOLITHIC COMPLEX (BROMLEY BATHOLITH): occurring between Princeton and Okanagan Lake in the northwest corner of the Penticton map area; marginal diorite intruded by quartz diorite, 165 +/- 9.7 Ma to 185 +/- 6.6 Ma, K-Ar and 166 +/- 53 Ma, Rb-Sr isochron; younger porphyritic granodiorite, 194.8 +/- 2.4 Ma, U-Pb (zircon); quartz monzonite and granite, 160.4 +/- 4.8 Ma to 133 +/- 4.1 Ma, K-Ar and 154 +/- 6 Ma, Rb-Sr isochron
Geological map and legend compiled from:

Cairnes, C.E. (1940): Kettle River (West Half), British Columbia; Geological Survey of Canada, Map 538A.

Hoy, T., Church, N., Legun, A., Glover, K., Gibson, G., Grant, B., Wheeler, J.O. and Dunn, K.P.E. (1993): Geology of the Kootenay River Map Area (NTS 82 and parts of 83C,D); B.C. Ministry of Energy, Mines and Petroleum Resources, Open File 1994-8.

Little, H.W. (1961): Kettle River (West Half) British Columbia; Geological Survey of Canada, Map 15-1961.

Tempelman-Kluit, D.J. (1989): Geological Map with Mineral Occurrences, Fossil Localities, Radiometric ages and Gravity Field for Penticton Map Area (NTS 82E), Southern British Columbia; Geological Survey of Canada, Open File 1969.

Tempelman-Kluit, D.J. (1989): Geology, Penticton, British Columbia, Geological Survey of Canada, Map 1736A, scale 1:250,000.

See Penticton (082ESW) Summary Sheet for an overview of the map area 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.