-0.432-0.300-0.228-0.181-0.149-0.126-0.107-0.093-0.081-0.072-0.064-0.058-0.052-0.046-0.041-0.037-0.034-0.031-0.028-0.026-0.024-0.022-0.021-0.019-0.018-0.017-0.015-0.014-0.013-0.012-0.011-0.010-0.009-0.009-0.008-0.006-0.005-0.004-0.003-0.002-0.0000.0010.0030.0040.0060.0080.0100.0120.0140.0170.0210.0250.0310.0400.0510.0640.0800.1010.1350.1860.2690.3920.626
nT/m
References Hood, P.J. 1965: Gradient measurements in aeromagnetic surveying. Geophysics, vol. 30, p. 891-902. Recommended Citation Kilfoil, G.J. and Cook, L.A. 2009: First Vertical Derivative of the Residual Magnetic Field, Corner Brook Map Area (NTS 12A/13), Aeromagnetic Survey - Corner Brook Area. Geological Survey, Department of Natural Resources, Government of Newfoundland and Labrador, Map 2009-33, Open File NFLD/3058, scale 1:50 000. Maps released as part of Open File NFLD/3058 are (refer to index map below):
First Vertical Derivative Map Area (NTS) Residual Magnetic Field of the Resid. Mag. Field
Little Grand Lake (12A/12) Map 2009-30 Map 2009-31 Corner Brook (12A/13) Map 2009-32 Map 2009-33 Harry’s River (12B/09) Map 2009-34 Map 2009-35 Serpentine (12B/16) Map 2009-36 Map 2009-37 Bay of Islands (12G/01) Map 2009-38 Map 2009-39 Pasadena (12H/04) Map 2009-40 Map 2009-41 Lomond (12H/05) Map 2009-42 Map 2009-43 Note Open File reports and maps issued by the Geological Survey Division of the Newfoundland and Labrador Department of Natural Resources are made available for public use without being formally edited or peer reviewed. They are based upon preliminary data and evaluation. The purchaser agrees not to provide a digital reproduction or copy of this product to a third party. Derivative products should acknowledge the source of the data. Disclaimer The Geological Survey, a division of the Department of Natural Resources (the “authors and publishers”), retains the sole right to the original data and information found in any product produced. The authors and publishers assume no legal liability or responsibility for any alterations, changes or misrepresentations made by third parties with respect to these products or the original data. Furthermore, the Geological Survey assumes no liability with respect to digital reproductions or copies of original products or for derivative products made by third parties. Please consult with the Geological Survey in order to ensure originality and correctness of data and/or products.
First Vertical Derivative of the Residual Magnetic Field
This map was derived from data acquired during an aeromagnetic survey carried out by Geo Data Solutions GDS Inc. The survey was flown during the period November 25, 2008 to March 30, 2009, using a Piper PA-31 Navajo aircraft C-GKSA. The aircraft was equipped with three Geometrics cesium vapour magnetometers with a sensitivity of 0.005 nT, installed in the tail boom and wingtip pods. Total field data were sampled at 10 Hz. The nominal traverse and control-line spacings were, respectively, 200 m and 2000 m, and the aircraft flew at a nominal terrain clearance of 90 m. Traverse lines were oriented N50°W with orthogonal control lines. The flight path was recovered following post-flight differential corrections to the raw Global Positioning System data and inspection of ground images recorded by a vertically mounted video camera. The survey was flown on a pre-determined flight surface to minimize differences in magnetic values at the intersections of control and traverse lines. These differences were computer-analyzed to obtain a mutually levelled set of flight-line magnetic data. The levelled values were then interpolated to a 50 m grid. The first vertical derivative of the residual magnetic field is the rate of change of the magnetic field in the vertical direction. Computation of the first vertical derivative removes long-wavelength features of the magnetic field and significantly improves the resolution of closely spaced and superimposed anomalies. A property of the first vertical derivative maps is the coincidence of the zero-value contour with vertical contacts at high magnetic latitudes (Hood, 1965). Digital versions of this map can be downloaded, at no charge, from the Newfoundland and Labrador Resource Atlas (http://gis.geosurv.gov.nl.ca/), and from the Geological Survey of Newfoundland and Labrador On-Line Open File page:
http://www.nr.gov.nl.ca/mines&en/geosurvey/publications/openfiles/. Corresponding digital profile and gridded data for this survey, as well as for airborne surveys flown over adjacent areas, are also available from the Newfoundland and Labrador Resource Atlas. Printed copies of this map may be obtained from the Geoscience Publication and Information Section, Geological Survey, Department of Natural Resources, Government of Newfoundland and Labrador, P.O. Box 8700, St. John’s, NL, Canada, A1B 4J6. Department: http://www.nr.gov.nl.ca/nr/ Geological Survey: http://www.nr.gov.nl.ca/mines&en/geosurvey/ E-mail: [email protected] OPEN FILE NFLD/3058 PUBLISHED 2009
49°0
0'
57°30'
48°45'
58°00' 57°30'57°35'57°40'57°45'57°50'57°55'
57°35'57°40'57°45'57°50'57°55'58°00' 49°00'48° 55'
48° 50'
48°5
5'48
°50'
48°4
5'54
0
00m
.N.
54
000
m.N
.54
0
00m
.N.
54
000
m.N
.27
2625
2423
2221
2019
1817
1615
1413
1211
1009
0807
0605
0403
0201
5 4 00 0m. N
.5 4 00 0m
. N.
5 4 00 0m. N
.5 4 00 0m
. N.
4 000m.E. 4 000m.E. 4 000m.E. 4 000m.E. 4 000m.E.4 000m.E. 63626160595857565554535251504948474645444342414039383736353433323130292827
4 000m.E. 4 000m.E. 4 000m.E. 4 000m.E. 4 000m.E.4 000m.E. 63626160595857565554535251504948474645444342414039383736353433323130292827
2726
2524
2 32 2
2 12 0
1 91 8
1 71 6
1 51 4
1 31 2
1 11 0
0 90 8
0 70 6
0 50 4
0 30 2
0 10 0
WATSONS POND
BOWATER PARK
INDUSTRIAL PARKREVIRR
EB
MUH
INDUSTRIAL PARK
KO
ORBYDAET
S
MARBLE MOUNTAIN
STAG LAKE
GRAND POND
KOORBS
EH
GU
H
DN
OP
SN
NY
P
TAYLORS NOSE
BRAKES COVE
LONG RANGE MOUNTAINS
HARRISONHUMBER ARM
RUSSELL
CROW HEAD
LONG RANGE MOUNTAINS
SUMMERSIDE
INDUSTRIAL PARK
IRISHTOWN
CORNER BROOK
PROTECTED AREA
LITTLE RAPIDS
MOUNT PATRICIA
BEAR HEAD
MARGARET
SEAL HEAD
BAY OF ISLANDS
MOUNT MUSGRAVE
COUNTRY ROAD
MARBLE MOUNTAIN
GLYNMILL POND
MAPLE VALLEY
CROW GULCH
POINT
YELLOW MARSH
BUCKET COVE
VALLEY LAKES
NORTHERN HARBOUR
GLOVER ISLAND
GRAND LAKE
THE NARROWS
GRAND LAKE
MASSEY DRIVE
DOGWOOD
WILD COVE BROOK
LONG RANGE MOUNTAINS
TRAN
S-CAN
ADA
HIGHW
AY
PROVINCIAL PARK
PINCHGUT LAKE
TRANS-CANADA HIGHWAY
CROW HILL
HUMBER VILLAGE
Power Line . . . . . . . . . . . . . . .
Flight Line . . . . . . . . . . . . . . . .
PLANIMETRIC SYMBOLS
Topographic Contour . . . . . . .
Drainage . . . . . . . . . . . . . . . . .
Road . . . . . . . . . . . . . . . . . . . .< 14104
15200
INDEX MAP
NATIONAL TOPOGRAPHICAL SYSTEM REFERENCE AND GEOPHYSICAL MAP INDEX
Digital Topographic Data provided by Geomatics Canada, Natural Resources Canada
NAD83 / UTM zone 21N
Scale 1: 50 000Geo Data Solutions GDS Inc., Laval, Quebec.Contract and project management by the
Compilation and map production by
Newfoundland and Labrador Department of Natural Resources.
G.J. Kilfoil and L.A. Cook
OPEN FILE NFLD/3058
(NTS 12A/13)
Corner Brook Map Area
AEROMAGNETIC SURVEY - CORNER BROOK AREA
CORNER BROOK - NTS 12A/13
5kilometres 432101 kilometres
BROOK PONDBAKERS
BROOK POND
REVI
R
REBMUH
REPPU
BIRCHY
DNOP
GIB
REVIRTUORT
WOODS
.KRBNIAM
EHT
LAKE
.KRBSEHGUH
GEORGES
.RENI
TN
EPRES
LAKE
REVIRDNALSIXOF
BAYBAY LAKE
SANDY
BAKERS BROOK
GADDS HARBOUR
BONNE BAY
GULF O
F ST.
LAW
RENCE
WESTERN
BASIN
GROS MORNE NATIONAL PARK
ADIES POND
GLENBURNIE
DEER LAKE
PASADENAHINDS LAKE
HOWLEY
DEER LAKE
LITTLE PORT
YORK HARBOUR
BAY OF ISLANDS
HUMBER ARM
GILLAMS
MCIVER'S
ISLAND
MEADOWS
SERPENTINE
EASTWEST
ST. GEORGE'S BAY
PORT AU P
ORT BAY
STEPHENVILLE
LAKE
CORNER BROOK
GLOVER IS
LAND
GRAND LA
KE
LITTLE GRAND LAKE
RED INDIAN
STAR LAKE
420
422
1
460463
401
450 440
1
1
430
431
430
12 G/02
12 H/0512 G/08
12 G/09 12 H/12 12 H/11
12 H/06
12 H/0312 H/0412 G/01
12 B/15
12 B/10 12 B/09
12 B/16 12 A/13 12 A/14
12 A/1112 A/12
57°00'57°30'58°00'58°30'59°00'
57°00'57°30'58°00'58°30'59°00'
49°45'
49°30'
49°15'
49°00'
48°45'
48°30'
49°45'
49°30'
49°15'
49°00'
48°45'
48°30'
2K
11J
NEWFOUNDLAND
2N
12J
12O
km100500
Labrador
58° 56° 54°
47°
48°
49°
50°
51°
47°
48°
49°
50°
51°
54°60° 58° 52°56°
John'sBasquesPort aux St.
Gander
FallsGrandBrook
Corner
1L11I
11O 11P 1M 1N
2C2D12A12B
1K
2F2E
2L
2M
12H
12I
12P
LakeDeer
12G
MAP 2009-33
THE RESIDUAL MAGNETIC FIELDFIRST VERTICAL DERIVATIVE OF
Map 2009-43
Map 2009-33
Map 2009-41Map 2009-39
Map 2009-37
Map 2009-35 Map 2009-31
MAP 2009-33
69400
68900
67500
65200
63800
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67500
63600
54200
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52400
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52200
52500
52400
52300
51300
51200
51100
51000
63700
63600
64100
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67400
67900
69400
69900
71400
71300
71800
73300
73800
75300
73700
73600
7350072200
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72000
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70300
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70100
69800
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66400
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63200
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72500
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72800
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43800
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4350045200
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46900
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47600
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72200
72100
72000
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6850067500
67400
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63900
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63500
63400
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60500
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60000
59900
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58800
58700
58600
5850058200
58100
58000
57900
57100
57000
56900
56800
56500
56400
56300
56200
72500
72400
72900
72800
74400
74300
74800
74700
76300
76200
46500
60300
60200
60100
58800
58700
5860058300
58200
58100
56800
56700
56600
56300
56200
56100
54800
54700
5460054400
54300
54200
52900
52800
52700
52400
52300
52200
50900
50800
50700
50400
50300
48900
48800
4870048500
48400
48300
60700
60600
60500
62200
62100
62700
62600
64200
64100
43900
43800
43700
45100
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46900
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47500
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49500
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51300
51200
52800
52700
52600
53200
53100
54700
54600
55200
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46800
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47400
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47700
47600
49100
49000
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48800
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49500
49400
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51400
51300
51200
51100
52600
52500
52400
52300
53200
53100
53000
52900
54300
54200
54100
54900
54800
54700
54600
56100
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56600
56500
56400
57800
57700
57600
58400
58300
58200
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59600
59500
59400
59300
5620
0
5500
0
5740
0
45400
45300
55100
55400
55300
56600
56900
56800
58100
51700
51600
58600
58500
58400
59800
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60200
60100
61400
61300
61800
61700
63100
63000
6290063500
63400
63300
4430
0
4420
0
4510
0
4500
0
4560
0
4550
0
4540
0
4640
0
4630
0
4620
0
4700
0
4690
0
4680
0
4670
0
4790
0
4780
0
4770
0
4760
0
4750
0
4860
0
4850
0
4840
0
4830
0
4820
0
5030
0
5020
0
5010
0
5000
0
4370
0
64700
64600
64500
65100
65000
64900
68700
68600
6410
0
6400
0
6390
0
6350
0
6340
0
6330
0
6570
0
6560
0
6550
0
50100
5110052300
53800
55200
56600
57800
58000
59100
59300
60500
60700
61700
61900
62900
63100
64100
70800
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0
4490
0
4340
0
4330
052500
52400
< 1970
< 1970
1960 >
1960 >
< 1950
< 1950
1940 >
1940 >
< 1930
< 1930
1920 >
1920 >
< 1910
< 1910
1900 >
1900 >
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< 1890
< 1980
< 1980
< 1880
< 1880
1870 >
1870 >
< 1860
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1850 >
1850 >
< 1840
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1830 >
1830 >< 18201810 >
< 1800
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< 3100
3090 >
3090 >
< 3080
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3070 >
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< 3060
2110 >
2110 >
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< 2100
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2090 >
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2010 >
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1990 >
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2560 >
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2540 >
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2500 >
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< 2920
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< 2900
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< 2880
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< 2190
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< 3730
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7251
>
7251
>
< 72
41
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41
< 72
31
7201
>
7201
>
< 71
90
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9071
80 >
3230 >
3230 >
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< 3490
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< 3470
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< 3290
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< 3270
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< 733
0
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30
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>
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>
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10
7300
>
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>
< 729
0
< 72
90
7280
>
7280
>
< 727
1
< 72
71
7260
>
7260
>
< 73
40
< 73
40
3260 >
3260 >
< 3250
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3240 >
3240 >
7250
>
7250
>
< 724
0
< 72
40
< 723
0
< 72
30
< 38003790 >< 37803770 >
3770 >
< 3760
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3720 >
< 3710
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< 3690
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7220
>
7220
>
< 72
10
< 72
10
3400 >
3400 >
