This is a recent poster describing the distribution and thickness of cover (basalt lavas and glacial drift) in central BC

1. Distribution and Thickness of basalts and drift on the Interior Plateau
Distribution et épaisseur des basaltes et des sédiments glaciaires de la région du plateau intérieur
1 2 2 3 1
Graham D.M. Andrews , Jackie Dohaney , Kelly Russell , Alain Plouffe , Robert G. Anderson
Geological Survey of Canada 1. Geological Survey of Canada, 625 Robson Street, Vancouver, British Columbia. V6B 5J3 Canada; email: Graham.Andrews@NRCan.gc.ca
2. EOS-UBC, 6339 Stores Road, Vancouver, British Columbia. V6T 1Z4 Canada
Commission géologique du Canada 3. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario. K1A O8E Canada
Prospectivity on the Interior Plateau has hitherto been hampered A B
by a lack of data to determine the areal distribution and vertical
WATER WELL MODELING 093A/05
093J/03 093J/02
Y
093J/01
A - intraglacial c. 1.06 Ma B - deglaciation post-1.06 Ma C - intraglacial >30 ka
RO
buried
thickness of Chilcotin Group basalt lavas and Quaternary drift. McLeese Lake paleochannel ?
CK
Water Well Records (n = 10,486) Bedrock Intersection Points (n = 3,189) Y
Peace Drainage
M
TN
y
S
e
Vall
CA
RI
Research at UBC supported by the GSC TGI-3 and MPB programs
BO
O
buried (Arctic)
ser
M
0 km 10 TN
S
paleochannel
Skeena Skeena
Fra
093K 093J 093I 093K 093J 093I INTE
Fraser-Peace
RIOR
1:500,000
and Geoscience BC reveals that basalt cover is thinner and less V V C
O
A
ST
PLAT
EAU
S
093G/15
Ferndale 093G/16 Drainage Drainage Basin Drainage
extensive than previously thought (<40%) across the Interior PG PG Miocene M
TN
S
Basin (Arctic) Basin
093F 093H 093F 093H 093B/08 alley
093G 093G ako V
Plateau. It is only thick (>20 m) in paleovalleys that can be readily RO
CK
Y
M
093B/01 X’ 093A/04 N ech
Prince George
Q TN
identified in geological and geophysical surveys. Similarly,
S
Q
CA
RI
BO
O
4 - Prince X’
M
TN
George area
Quaternary drift, although areally extensive, is only thick in
S
093C 093B 093A 093C 093B 093A INTE
RIOR
WL
WL Williams Lake X
paleovalleys. We have mapped cover thickness variations in
C
O
A
ST
PLAT
EAU
S
Beaverley
bedrock intersection point
Fraser Valley
M
TN 093G/14
S
‘C ‘C
several areas on the Interior Plateau (below) using a combination 100 100 150 Mile House
093G/09
“push down” point
oa oa
ey
092N 092O 092N 092O
ll
sta sta
Va
buried drift thickness (m) n = 1576
ko
of field observations, water well records, and archived 0 50 km
092P
0 50 km
092P
Ba l’ Dr Ba l’ Dr
ila
paleochannel ? < 10 10 - 20 20 - 50
C Y’
Ch
geological, geochronological, geophysical, and MINFILE data “COVER” 50 - 100 > 100
sin ain sin ain
Fras
0 km 10
Water well logs recorded by the Province of British a a
e
e
092P/13 bedrock (m asl)
ge ge
er V
g
g
1:500,000
X
(A) Typical till veneer (<1 m) covering granite
sin ina
sin ina
sets; the results of which are presented here and will be Columbia provide valuable subsurface data, in particular
a lley
bedrock intersection point
Springhouse 093G/11 093G/10 400 850 1300
bedrock (092P). (B) Forested till blanket (>1 m) 2 - Williams Lake
Ba Dra
Ba Dra
“push down” point
for identifying the cover - bedrock surface. Wells are
published soon. covering “thin” (<20 m) Chilcotin Group basalt unevenly distributed across the Interior, concentrated
area 092O/16 drift thickness (m) n = 1954
X X’
bia