GEOCHRONOLOGY |
MAP # |
FIELD # |
AGE
(Ma) |
LAB1 |
UTM
Easting (NAD83) |
UTM
Northing (NAD83) |
GEOGRAPHICAL
LOCATION |
LITHOLOGY |
ROCK
UNIT |
REFERENCE |
|
|
|
|
|
|
|
|
|
|
1 |
HFBL02-2003 |
191
± 12 (U/Pb) |
UBC |
651942 |
5870269 |
W
of East Sakumtha River |
Quartz-dacite
lapilli tuff |
Hazelton
Group |
R.
Friedman (this study) |
2 |
HFBM02-3020 |
189
± 0.8 Ma (U/Pb) |
UBC |
655520 |
5782130 |
Howe
Lake |
Tonalite |
Howe
Lake plutonic suite |
R.
Friedman (this study) |
3 |
GJP-27 |
182.4
± 4.7 Ma (U/Pb) |
Univ
Az |
631589 |
5832108 |
1.5
km SW of Wattie Point |
Diorite |
Howe
Lake plutonic suite |
G.
Gehrels (pers. comm., 2006) |
4 |
HFBL02-1604-1 |
181.9
± 0.8 (U/Pb) |
UBC |
667038 |
5796259 |
6
km N of Mount Saugstad |
Foliated
biotite tonalite |
Howe
Lake plutonic suite |
R.
Friedman (this study) |
5 |
HFB03-0508-1 |
181.6
± 1.0 Ma (U/Pb) |
UBC |
652740 |
5835620 |
Ridge
W of Kalone Peak |
Quartz-rich
crystal lithic tuff |
Hazelton
Group |
R.
Friedman (this study) |
6 |
HFBM02-1405-1 |
176.5
± 0.6 (U/Pb) |
UBC |
664895 |
5872855 |
NE
of Jumble Mountain |
Crystal-lithic
lapilli tuff |
Hazelton
Group |
R.
Friedman (this study) |
7 |
SCBD01-0605 |
171.6
± 2.3 (U/Pb) |
UBC |
677545 |
5828855 |
Lowermost
N slope of Tzeetsaytsul Peak |
Aphanitic
dacite flow dome |
Hazelton
Group |
R.
Friedman (this study) |
8 |
HFBL02-1404-1 |
170.2
± 1.4 (U/Pb) |
UBC |
672070 |
5828107 |
NW
of Mount Stepp |
Quartz-rhyolite
flow |
Noosgulch
assemblage |
R.
Friedman (this study) |
9 |
SCB01-4104/VN01-B05 |
Detrital
zircon continuum: 180-138 Ma, with peak ca. 160 Ma (U/Pb) |
GSC-O |
656057 |
5829560 |
Ridge
between Swallop Creek and Necleetsconnay River, apprxoimately 7 km W of Mount
Creswell |
Wacke
with granitic detritus |
Monarch
assemblage |
M.
Villeneuve (this study) |
10 |
SCBD01-2502 |
164.7
± 2 (U/Pb) |
UBC |
673912 |
5834551 |
Ridge
SE of Mount Collins |
Rhyolite
ash-flow tuff |
Noosgulch
assemblage |
R.
Friedman (this study) |
11 |
GR96-124 |
164.2
± 4.4 (U/Pb) |
UBC |
675150 |
5828850 |
Nifty
mineral prospect |
Quartz-phyric
rhyolite dyke |
Noosgulch
assemblage |
Ray
et al. (1998) |
12 |
SCB00-0707-1 |
163.7
± 0.4 (U/Pb) |
GSC-O |
675234 |
5829271 |
Nifty
area |
Dacitic
breccia |
Noosgulch
assemblage |
M.
Villeneuve (this study) |
13 |
HFBL02-3001-3 |
162.4
+1.3/-0.6 (U/Pb); 72.9 ± 1.1 Ma (Ar/Ar [K-fspar]) |
UBC |
674616 |
5841390 |
NE
of Stack Peak |
Biotite
granodiorite |
Firvale
plutonic suite5 |
R.
Friedman and T. Ullrich (this study) |
14 |
V89-56-4 |
159.6
± 0.5 (U/Pb) |
vdH |
7001472 |
58008992 |
2
km NNW of Nordschow Creek |
Mylonitic
granodiorite |
Firvale
plutonic suite? |
van
der Heyden (2004) |
15 |
GJP-24 |
157.1
± 3.2 Ma (U/Pb) |
Univ
Az |
638343 |
5839975 |
E
side Dean Channel opposite mouth of Sutslem Creek |
Diorite |
JKp |
G.
Gehrels (pers. comm., 2006) |
16 |
04-M-213 |
149.1
± 0.5 (U/Pb) |
UBC |
636263 |
5873462 |
E
of Dam Mountain |
Hornblende-biotite
granodiorite |
Firvale
plutonic suite5 |
R.
Friedman (this study) |
17 |
HFBL02-0601-1 |
149
± 1 (U/Pb) |
UBC |
660793 |
5853994 |
SW
of Mount Bernhardt |
Hornblende-biotite
granodiorite |
Firvale
plutonic suite5 |
R.
Friedman (this study) |
18 |
HFBL02-3004-2 |
148.6
± 0.6 (U/Pb) |
UBC |
665129 |
5840789 |
S
of Forward Mountain |
K-mega
granodiorite |
Firvale
plutonic suite5 |
R.
Friedman (this study) |
19 |
GJP-1 |
144.5
± 2.9 Ma (U/Pb) |
Univ
Az |
674762 |
5814646 |
W
side Tseapseahoolz Creek |
Diorite |
JKp |
G.
Gehrels (pers. comm., 2006) |
20 |
SCBM01-1405-1 |
141
± 1 (Ar/Ar [hbl, biot]) |
UBC |
650034 |
5836972 |
Head
of Humpback Creek |
Quartz-phyric
granodiorite |
Firvale
plutonic suite? |
T.
Ullrich (this study) |
21 |
SCBD01-1803-2 |
140.0
± 1.0 Ma (U/Pb) |
UBC |
648705 |
5813457 |
S
spur of Mount Pootlass |
Quartz-phyric
rhyolite dyke |
|
R.
Friedman (this study) |
22 |
SCB01-1704-1 |
139.9
± 1.2 (U/Pb) |
GSC-O |
666800 |
5825700 |
Ridge
SW of Talcheazoone Lakes |
Chlorite
altered biotite granodiorite |
Firvale
plutonic suite |
M.
Villeneuve in Struik et al. (2003) |
23 |
SCB01-4106-2 |
134.3
± 0.2 (U/Pb) |
GSC-O |
669570 |
5818281 |
Ridge
NW of Salloomt Peak |
Chlorite
altered hornblende granodiorite |
Firvale
plutonic suite |
M.
Villeneuve in Struik et al. (2003) |
V89-49-1 |
133.9
± 0.2 (U/Pb) |
vdH |
6696862 |
58182482 |
5.9
km NNW of Salloomt Peak |
Chlorite
altered biotite-hornblende granodiorite |
Firvale
plutonic suite |
van
der Heyden (2004) |
24 |
SCB01-1301-3 |
133.4
± 0.2 (U/Pb) |
GSC-O |
655951 |
5828563 |
Ridge
between Swallop Creek and Necleetsconnay River |
Foliated
quartz diorite |
Firvale
plutonic suite |
M.
Villeneuve in Struik et al. (2003) |
25 |
V89-57 |
133.1
± 4.3 (U/Pb) |
vdH |
6980462 |
58052192 |
Along
logging road adjacent to Talchako River |
Chlorite
altered biotite-hornblende granodiorite |
Firvale
plutonic suite |
van
der Heyden (2004) |
26 |
BBC-9 |
132.0
± 0.6 (U/Pb) (minimum age) |
vdH |
7030972 |
58051402 |
Outcrop
along Highway 20, approximately 5 km E of Stuie |
Altered
granodiorite |
Firvale
plutonic suite (Atnarko pluton) |
van
der Heyden (2004) |
27 |
SCB01-2306-1 |
122.6
± 1.4 (U/Pb) |
GSC-O |
648530 |
5821542 |
Ridge
N of Mount Pootlass |
Biotite-quartz
diorite/tonalite |
Desire
plutonic suite |
M.
Villeneuve in Struik et al. (2003) |
28 |
91GC1001 |
119.0
± 2 (U/Pb) |
Univ
Az |
650084 |
5804957 |
Along
highway W of Bella Coola |
Biotite
quartz diorite |
Desire
plutonic suite |
Gehrels
and Boghossian (2000) |
29 |
HFBWV02-0905 |
118.8
± 0.4 (U/Pb) |
UBC |
669721 |
5782973 |
5
km ESE of Desire Mountain |
Tonalite |
Desire
plutonic suite |
R.
Friedman (this study) |
30 |
SCBD01-0402 |
113
Ma minimum3 (U/Pb) |
UBC |
677417 |
5827245 |
100
m below summit of Tzeetsaytsul Peak |
Rhyodacite
lapilli tuff |
Salloomt
assemblage |
R.
Friedman (this study) |
31 |
79-JBM-05 |
112.8
± 1.5 Ma (U/Pb) |
UBC |
670428 |
5817241 |
Upper
part of ridge SE from summit of prominent peak N of Salloomt Peak |
Welded
tuff |
Salloomt
assemblage |
R.
Friedman (this study) |
32 |
SCBD01-2803-1 |
110.6
± 2.6 Ma (Ar/Ar [hbl]) (date considered unreliable) |
UBC |
639153 |
5817702 |
3
km due W of Mount Saunders |
Hornblende
andesite tuff |
Hazelton
Group |
T.
Ullrich (this study) |
33 |
HFBWV02-0803-2 |
110.3
± 0.5 (U/Pb) |
UBC |
695719 |
5801042 |
Melikan
Mountain |
Granite |
Melikan
pluton |
R.
Friedman (this study) |
34 |
SCBD01-0406 |
104.6
± 2.5 Ma4 (Ar/Ar
[hbl]) |
UBC |
676590 |
5826853 |
W-facing
slope of Tzeetsaytsul Peak, elev 1995 m |
Augite-hornblende
phyric andesite |
Salloomt
assmblage (massive basaltic unit) |
T. Ullrich (this study) |
35 |
GJP-13 |
98.4
± 1.8 Ma (U/Pb) |
Univ
Az |
624394 |
5796555 |
Burke
Channel 0.75 km S of Kwaspala Point |
Tonalite |
|
G.
Gehrels (pers. comm., 2006) |
36 |
HFBL02-1704-1 |
95.10
± 0.76 Ma (Ar/Ar [biot]) |
UBC |
666523 |
5798035 |
Ridge
between Snootli and Nooklikonnik creeks |
Biotite
tonalite |
Big
Snow plutonic suite |
T.
Ullrich (this study) |
37 |
91MR-85 |
91
± 3 (U/Pb) |
Univ
Az |
672578 |
5760064 |
NW
of Mount Daunt (original published but incorrect loc data: 54°N
126°29'27"W) |
Orthogneiss |
Mount
Daunt pluton |
Rusmore
et al. (2000) |
38 |
HFB02-0101-2 |
86.9
± 0.9 (U/Pb) |
UBC |
660578 |
5798231 |
Ridge
between Thorsen and Snooka creeks |
Biotite
granodiorite |
Big
Snow plutonic suite |
R.
Friedman (this study) |
39 |
GJP-23 |
82.8
± 2.8 Ma (U/Pb) |
Univ
Az |
618865 |
5823435 |
W
side of Dean Channel, 2.5 km SW of mouth of Carlson Inlet |
2-mica
granite |
JKp |
G.
Gehrels (pers. comm., 2006) |
40 |
SCB00-0505-1 |
79
+4/-6 (U/Pb) |
GSC-O |
680991 |
5788439 |
Approximately
2.5 km WSW of Odegard Falls |
Granodiorite
to quartz diorite |
Big
Snow plutonic suite? |
M.
Villeneuve (this study) |
41 |
SCB01-1401-1 |
77.7
± 1.8 Ma (Ar/Ar [hbl]) (reset) |
UBC |
661992 |
5824615 |
Near
Hourglass Lake |
Basalt
flows |
Monarch
assemblage |
T.
Ullrich (this study) |
42 |
GJP-9 |
77.3
± 1.7 Ma (U/Pb) |
Univ
Az |
641406 |
5801662 |
S
side of North Bentinck Arm at Flagpole Point |
Diorite |
Fougner
plutonic suite |
G.
Gehrels (pers. comm., 2006) |
43 |
SCBM01-1802-1 |
76.34
± 0.52 Ma (Ar/Ar [biot]); 97.3 ± 1.2 Ma (Ar/Ar [hbl, hi-T]) (both dates
reset) |
UBC |
652744 |
5817961 |
Ridge
N of Christenson Creek |
Hornblende-biotite
tonalite |
Desire
plutonic suite |
T.
Ullrich (this study) |
44 |
HFBM02-2507-1 |
75.3
± 0.5 (U/Pb) |
UBC |
655462 |
5813720 |
Necleetsconnay
River |
|
Fougner
plutonic suite |
R.
Friedman (this study) |
45 |
SCB01-1209-1 |
72.9
± 0.5 (U/Pb) |
GSC-O |
656750 |
5827850 |
Ridge
between Necleetsconnay River and Swallop Creek |
Garnet-muscovite-biotite
granite |
Four
Mile plutonic suite |
M.
Villeneuve in Struik et al. (2003) |
46 |
SCB00-0710-1 |
72.1
+0.2/-1.0 (U/Pb) |
GSC-O |
661090 |
5809963 |
E
of Four Mile Mountain |
Garnet-muscovite
granite |
Four
Mile plutonic suite |
M.
Villeneuve (this study) |
47 |
01JBM03 |
72.0
± 0.3 (U/Pb) |
UBC |
666082 |
5806097 |
Bella
Coola River valley bottom, S side |
Garnet
2-mica granite |
Four
Mile plutonic suite |
R.
Friedman (this study) |
48 |
HFBM02-0301-3 |
70.18
± 0.60 Ma (Ar/Ar [biot]); 74.0 ± 4.3 Ma (Ar/Ar [hbl]) |
UBC |
701781 |
5771783 |
Toe
of Jacobsen Glacier |
Biotite
tonalite |
KPd |
T.
Ullrich (this study) |
49 |
HS-40-06-64 |
70
± 14 (K/Ar [biot]) |
GSC-O |
684864 |
5777235 |
Elev.
6000', N side of War Drum Glacier (52°07'N 126°18'W) |
Unfoliated
biotite-hornblende granodiorite |
Big
Snow plutonic suite? |
A.J.
Baer in Wanless et al. (1967) (Date GSC 65-28) |
50 |
HFBL02-2201-1 |
68.2
± 1.0 (U/Pb) |
UBC |
649820 |
5795231 |
Summit
of Mount Fougner |
Biotite
tonalite |
Fougner
plutonic suite |
R.
Friedman (this study) |
51 |
HFBG02-1003-1 |
67.2
± 0.3 (Ar/Ar [biot]) |
UBC |
649619 |
5816775 |
Ridge
near headwaters of Christenson Creek |
Muscovite-biotite
granite, trace muscovite |
Four
Mile plutonic suite |
T.
Ullrich (this study) |
52 |
91MR-07 |
62.2
± 1.0 (U/Pb) |
Univ
Az |
6347762 |
57969472 |
Burke
Channel, Menzies Point |
Mylonitized
2-mica granite |
Pg |
Rusmore
et al. (2001) |
53 |
GJP-22 |
61.5
± 1.7 Ma (U/Pb) |
Univ
Az |
620522 |
5822251 |
E
side of Dean Channel, 1 km NE of White Cliff Point |
Diorite |
Pg |
G.
Gehrels (pers. comm., 2006) |
54 |
91GC1041 |
61.4
± 0.6 (U/Pb) |
Univ
Az |
6270862 |
57973772 |
S
shore Burke Channel east of Kwaspala Point |
Protomylonitic
tonalite |
Pg |
Rusmore
et al. (2001) |
55 |
GJP-12 |
58.4
± 1.9 Ma (U/Pb) |
Univ
Az |
625219 |
5797663 |
Burke
Channel, S side of Jacobsen Bay |
Tonalite |
Pg |
G.
Gehrels (pers. comm., 2006) |
56 |
BT-89-A-63 |
57
± 6 (K/Ar [biot]) |
GSC-O |
620153 |
5808633 |
Ovesen
Point, Labouchere Channel (52°25'N 127°14'W) |
Granite
to granodiorite |
|
A.J.
Baer in Wanless et al. (1966) (Date GSC 64-10) |
BT-89-A-63 |
51
± 6 (K/Ar [musc]) |
GSC-O |
620153 |
5808633 |
Ovesen
Point, Labouchere Channel (52°25'N 127°14'W) |
Granite
to granodiorite |
|
A.J.
Baer in Wanless et al. (1968) (Date GSC 66-20) |
57 |
92MR37 |
56
± 2 (U/Pb) |
Univ
Az |
6668932 |
57534092 |
S
of Noieck River |
Unfoliated
tonalite |
Sheemahant
pluton |
Rusmore
et al. (2001) |
58 |
HFBW02-1203-1 |
53.0
± 0.2 (Ar/Ar [biot]) |
UBC |
651023 |
5847960 |
S
of Nooskulla Peak |
Biotite
tonalite |
Nooskulla
pluton |
T.
Ullrich (this study) |
59 |
HFBL02-0903 |
53
± 0.1 (U/Pb) |
UBC |
662410 |
5862290 |
N
side of Sea Lion Peak |
Biotite-quartz
rhyolite flow dome |
Ootsa
Lake Group |
R.
Friedman (this study) |
60 |
GJP-16 |
52.7
± 1.5 Ma (U/Pb) |
Univ
Az |
621346 |
5805356 |
Labouchere
Channel, Deas Point |
2-mica
granite |
Mesachie
pluton |
G.
Gehrels (pers. comm., 2006) |
61 |
HFBL02-1201-1 |
52.52
± 0.49 Ma (Ar/Ar [biot]) |
UBC |
657696 |
5867589 |
S
flank Sakumtha Crag |
Quartz
biotite granitoid dyke |
|
T.
Ullrich (this study) |
62 |
HFBW02-0201-2 |
51.9
± 0.2 (Ar/Ar [musc]); 52.7 ± 0.4 (Ar/Ar [biot]) |
UBC |
630796 |
5803474 |
Approximately
4 km NNE of Lalakata Point |
Muscovite-biotite
granite |
Mesachie
pluton |
T.
Ullrich (this study) |
63 |
91GC1053 |
51
± 4 (U/Pb) |
Univ
Az |
6202452 |
58089662 |
Labouchere
Channel, SE of Edward Point |
2-mica
granite dyke |
|
Rusmore
et al. (2001) |
64 |
BT-31-03-64 |
47
± 5 (K/Ar [biot]) |
GSC-O |
652900 |
5854500 |
Elev.
5500', NE of Nooskulla Peak; location given in reference (52°49'N 126°38'W)
is incorrect |
Leucocratic
granodiorite |
Nooskulla
pluton |
A.J.
Baer in Wanless et al. (1967) (Date GSC 65-19) |
|
1 GSC-O = Geological Survey of Canada-Ottawa;
Univ Az = University of Arizona, Tucson; UBC = University of British
Columbia, Vancouver; vdH = University of British Columbia, Vancouver (van der
Heyden thesis sample) |
2 UTM Easting and Northing data converted
from original NAD27 coordinates as determined from 1:50 000 scale topographic
map |
3 Inconclusive date, requires additional
zircon grains |
4 Inconclusive date, insufficient hornblende |
5 Formerly Stick Pass plutonic suite |
|
REFERENCES |
Gehrels, G.E. and Boghossian, N.D., 2000.
Reconnaissance geology and U-Pb geochronology of the west flank of the Coast
Mountains between Bella Coola and Prince Rupert, coastal British Columbia. In Stowell, H.H. and McClelland,
W.C., eds., Tectonics of the Coast Mountains,
Southeastern Alaska and British Columbia;
Geological Society of America, Special Paper 343: 61-75. |
|
Ray, G.E., Brown, J.A., Friedman, R.M., and
Cornelius, S.B., 1998. Geology of the Nifty Zn-Pb-Ba prospect, Bella Coola
district, British Columbia. In Geological Fieldwork
1997. A Summary of Field Activities and Current Research; British Columbia Geological Survey Branch, Paper 1998-1, pp.
20-1–20.28. |
|
Rusmore, M.E., Woodsworth, G.J., and Gehrels,
G.E., 2000. Late Cretaceous evolution of the eastern Coast Mountains, Bella
Coola, British Columbia. In
Stowell, H.H. and McClelland, W.C., eds., Tectonics
of the Coast Mountains, Southeastern Alaska and British Columbia; Geological Society of America Special Paper 343: 89-105. |
|
Rusmore, M.E., Gehrels, G., and Woodsworth, G.J.,
2001. Southern continuation of the Coast shear zone and Paleocene strain
partitioning in British Columbia-southeast Alaska. Geological Society of
America Bulletin, 113 (8): 961-975. |
|
Struik, L.C., Hrudey, M.G., Mahoney, J.B., Diakow,
L.J, Sparks, H.A., Kaiser, E.A., Gleeson, T.P., and Woodsworth, G.J., 2003.
Geology, Necleetsconnay River area, British Columbia (93D/10 and part of
93D/07). Geological Survey of Canada, Open File 1463, geologic map, scale
1:50 000, 16 p. |
|
van der Heyden, P., 2004. Uranium-lead and
potassium-argon ages from eastern Bella Coola and adjacent parts of Anahim
Lake and Mount Waddington map areas, west-central British Columbia.
Geological Survey of Canada, Current Research 2004-A2, 14 p. |
|
Wanless, R.K., Stevens, R.D., Lachance, G.R., and
Rimsaite, J.Y.H., 1966. Age determinations and geological studies. K-Ar
isotopic ages, Report 6. Geological Survey of Canada, Paper 65-17, 101 p. |
|
Wanless, R.K., Stevens, R.D., Lachance, G.R., and
Edmonds, C.M., 1967. Age determinations and geological studies. K-Ar isotopic
ages, Report 7. Geological Survey of Canada, Paper 66-17, 120 p. |
|
Wanless, R.K., Stevens, R.D., Lachance, G.R., and
Edmonds, C.M., 1968. Age determinations and geological studies. K-Ar isotopic
ages, Report 8. Geological Survey of Canada, Paper 67-2, Part A, 141 p. |
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