Part of NTS Sheets 21A/05, 21A/12, 21A/13, 21B/08 and 21B/09 Nova Scotia Department of Natural Resources - Mineral Resources Branch OFM ME 2010-9
44°40'N 66°W 65°50'W 251000mE 52 53 54 55 56 57 58 59 260 61 62 63 64 65 66 67 68 69 270 71 72 73 74 75 76 77 78 79 280 81 82 83 84 85 86 287000mE N N 000m 000m 48 49 65 Legend 49
A
n MESOZOIC D 47 n a i g p 64 b o
y l i
s C TRIASSIC C o
u o
n u
t n y t y FUNDY GROUP
NORTH MOUNTAIN FORMATION 46 63 BRIER ISLAND MEMBER (Upper Flow Unit) (^Fnmb) : this unit ( À 150 m) occurs at the ^Fnmb top of the basalt sequence, conformable on unit ^Fnmm and outcrops extensively on the northern shorelines except in the central part of the mapped area where it is notably absent. The basalt is massive, dark grey to grey-green with microcrysts (À 5%) of plagioclase and pyroxene with variable (À 30-40%) amounts of mesostasis in a medium- 45 grained, ophitic-textured host. This unit consists of 1 or 2 flow sheets, has colonnade- 62 style polygonal jointing (À 1 m) and, at the base, inclined pipe vesicles occur. The lower 10-20 m locally (e.g., Morden, Margaretsville) contains felsic material (ca. 65-74 wt. %
SiO2 ) in the form of dykes, amoeboid masses and spectacular segregation pipes (3-60 cm; 10-15/m2 ) that are sometimes cored by agate and crystalline silica. Rarely veins of silica cut the unit and locally areas of intense silica alteration occur.
44 61 65°40'W MARGARETSVILLE MEMBER (Middle Flow Unit) (^Fnmm) : this unit occurs between the ^Fnmm massive and relatively fresher^Fnme and ^Fnmb flows. Due to alteration the unit is recessive and occupies low lying, locally swampy (e.g., Long Island and Brier Island) d y areas. Significantly, in the eastern part of the mapped area (i.e., Scots Bay) the unit is in n contact with the younger Triassic Scots Bay Formation rather than the Brier Island F u Member. The unit varies in thickness from À 20-40 m in the western part of the mapped 43 f area to À 170 m maximum thickness in the central area; areal exposure varies o 4960
y considerably towards the east. Individual flows are fine grained, dark grey to grey-green
a and/or red-brown, massive to intensely vesiculated, generally altered and, therefore, very
B
friable. The unit contains multiple (15-20), thin (À 15-20 m), geometrically complex flow
sheets with abundant, zonally-arranged vesicles (e.g., pipes, vesicle cylinders and
sheets) which are mostly occluded with different zeolite phases (locally 20-30% by
volume) and lesser silica and micaceous material. In thicker flows the cores or lower parts
42
59 can be massive and rarely exhibit columnar jointing. Abundant field evidence (e.g., flow
lobes, stacked lobes, vesicle zonation, tumuli) indicates this is a compound flow unit
consisting of abundant inflated pahoehoe flow sheets. Red-brown oxidized tops and
^Fnmm Fleet Brook neptunian dykes of fine-grained, red-brown siliceous material in the upper half of flows ^Fnmb
indicate a time hiatus between flows. Veins of silica material, including jasper and
Head
S chalcedony, occur.
l
o
41 a
Green n
k 58
s
o EAST FERRY MEMBER (Lower Flow Unit) (^Fnme) : this unit occurs at the base of the
Point
o B
Point B
r
Cu ^Fnme
r o
basalts and outcrops extensively on shorelines in the western part of the mapped area,
B o
Prim g
o
s
a k
but lesser in inland areas in the central and eastern parts of the mapped area. The basalt
e
r i
t l
r ^Fnmm
Condons B a is grey-green and dominantly holocrystalline with microcrysts (À 5%) of plagioclase and
r h
o C
Point Shag o pyroxene with variable (À 15%) amounts of mesostasis. The contact with the underlying
k
Cliffs Triassic Blomidon Formation sedimentary rocks, which are altered (i.e., whitish clay
^Fnmb
49
40
material) near the contact, is rarely exposed (e.g., north of Bridgetown, eastern side of
57
^Fnmm
F Bogart
Digby Gut). (Note: The Blomidon Formation is not shown on this map series. See Keppie
l
e Lake
e
(2000) for location). The top (ÀÀ 1-5 m) and bottom ( 10-25 cm) of the flow are chilled and
Tommys t
M
B
Mill Cove i ^Fnmb
Point c vesiculated with the top also locally red-brown due to oxidation. The unit contains well-
m r o
Point o developed polygonal jointing (i.e., columnar joints 2 m) of colonnade and complex
a
Johnson k c
^Fnmm
B k entablature patterns. The upper part of the flow is distinguished by layers (30-50 cm) of
^Fnmb B k r Hill
^Fnmb
o ls Bay Fleet
39 B l vesiculation, now occluded by zeolites, and also by bands (centimetres to 1-3 m) of mafic o
u T
r b
k View Lake 56
o n
r U ^Fnme pegmatite (upper 30-50 m). These sheet-like layers are comb-textured and pyroxene-rich
Theriaults n u
n T Gu llivers V
Culloden G k
o o with a granophyric matrix; concordant or discordant rhyolite or granophyre seams (À 3 Point
o
C r Burns '
Head ^Fnme B
O s cm) may also occur. The unit may also contain large (tens of metres wide) circular
Point Y Zeolite ^Fnmm ne
^Fnmm r
B o features, referred to as rootless cones, which are most prevalent in the central and h
T
G Battery
I rook western parts of the mapped area. Fractures cutting the unit are lined with zeolites or
B
Victoria
D Point Worcester p
u silica, or more rarely sedimentary dykes consisting of fine-grained, silica-rich, red-brown c
38 Van Beach Lake os r Thornes material.
Tassel C 55
IN Cove
TH MOUN TA Lake ^Fnme
^Fnmb R NO
U 202±1 k
Indian Kaolinite o
ro
Lynchs
ke B
^Fnmb Gullivers Bur
Mountain Beach
Cove Karsdale
Fe Port
Pollys
^Fnmm Wade
37
Point McWhinnies
k 54 Post oo
Mount er Br Handspik Point
Mountain Pleasant Beamans Rattling Upper
^Fnmm Fe Mountain
Beach
Point
Lower ^Fnme
Hendersons
> Smalls > > Black Point CK Seawall
NE ^Fnmm Lake Mountain
k
Y Point Jasper o Hi ll
GB ro
I B
D k 36 n o
^Fnmb o o Roxville Symbols *
s r 53
n t B
> h h
g o > Hai
Waterford J
> Outcrop ......
>
> Centreville ^Fnme G r
if Fe
fi Lighthouse
n > Drillhole (after Fisher, 2006) ...... B
ro ^Fnme The Road
o
k
k Seawall o Mineral occurrence (Au - gold, Cu - copper, o
35 r Fe - iron, Mn - manganese, V - vanadium) ^Fnmm Rossway B H Lake t k 52 Cu s o o Midway o o l (after O'Reilly et al., 2009) ......
P r d
B s
s w d
d o
u r Radiometric date (U-Pb zircon; Ma) t U 202±1 Fe B h
B (after Hodych and Dunning, 1992) ...... idway k
e M
Lak ^Fnme
Annapolis Basin Geological contact
34 Green (defined, assumed) . . . . . 51 Seabrook Point Fault (defined) ...... Red
Head LiDAR survey area (Webster, 2010) ...... F e Digby Broo k Not Mapped Shipyards derson
Hen
33 Point Shaws # 4950 #! Bear Point Lighthouse ...... Island Rock in water ...... > Cornwallis Arterial highway ...... 102
! Park !
! Clementsport See 44°40'N ly B Trunk highway ...... 4 32 roo ! 44°30'N k M 49
o Collector highway ...... 333 ! Pinkneys o y s a Robinsons e Point D B ! e R Hard surface road ...... D Point e i s p i v B Deep B t e y S P m o u r r
r ! m o Loose surface/resource access road . . . y a a r Brook o c d r
i e k
M t Bear River y s Jordantown h
s
Marshalltown B B t ! C B
Guinea
o Station k Trail, footpath, cart track ......
!
31 S Au v k k
e !
!
! 48 !
!
! !
! ! Railway (active, inactive) ...... Brighton ! Not Mapped !
! Coastline...... Y Joggin
o ! u ! Bridge n River, stream ...... W
g ! N
a
s Waldeck !
l Waldeck N s
B ! East County boundary ...... h 000m r
o B ! 000m
30 o !
Acaciaville ! r rvey o u
k S !!! 49 !
R 47 ! iDA Transmission line (single line) ......
o mit of L 49
! i
! L
k
Barton ! R
! Swamp ...... ! 260000mE 61 62 63 64 65 66 67 68 69 270 71 72 73 74 75 76 77 78 79 280 81 82 83 84 85 86 87 88 89 290 91 92 93 94 295000mE Lake/ocean ...... 66°W 44°30'N 65°50'W 65°40'W
* Note: Compiled symbols list for map series. All symbols may not appear on each map.
Map Notes Descriptive Text Nova Scotia Department of Natural Resources Selected References Mineral Resources Branch 64°W 60°W 66°W 65°W This is 1 map in a series of 5 bedrock geology maps at a scale of 1:50 000. This map series shows the extent of the North Mountain Formation, which is a Cirilli, S., Marzoli, A., Tanner, L., Bertrand, H., Buratti, N., Jourdan, F., Bellieni, G., Kontak, D. J. 2006b: Geological map of the North Mountain Basalt from Cape Split Open File Map ME 2010-9 laterally continuous unit of basalt outcropping semicontinuously for about 200 km Kontak, D. and Renne, P. R. 2009: Latest Triassic onset of the Central Atlantic to Brier Island, with comments on its resource potential; in Mineral Resources New Gulf of GIS databases, cartography and reproduction by Angie Ehler, Brian Fisher, John from Cape Split in the east to Brier Island in the west. The basalt is sandwiched Magmatic Province (CAMP) volcanism in the Fundy Basin (Nova Scotia): new Branch, Report of Activities 2005, ed. D.R. MacDonald; Nova Scotia Department of New St. Lawrence Brunswick MacNeil and Jeff McKinnon of the Nova Scotia Department of Natural Resources, between Triassic age clastic sedimentary rocks of the Blomidon and Scots Bay stratigraphic constraints; Earth and Planetary Science Letters, v. 286, p. 514-525. Natural Resources, Report ME 2006-1, p. 39-66. Brunswick Bedrock Geology Map of Basaltic Rocks of the Geoscience Information Services Section, 2010. The GIS databases and map were formations. (Note: The Blomidon Formation is not shown on this map series. See P.E .I. developed using ArcGIS® 9.3. Keppie (2000) for location). The North Mountain Formation consists of three North Mountain Formation from Centreville to Bogart Lake, Fisher, B. E. 2006: Nova Scotia drillholes database; Nova Scotia Department of Kontak, D. J. 2008: On the edge of CAMP: geology and volcanology of the Jurassic t 5 46°N 46°N ee members which are arranged in a conformable, layer-cake stratigraphy dipping gently Natural Resources, Digital Product ME 3, Version 4; North Mountain Basalt, Nova Scotia; Lithos, v. 101, p. 74-101. y Sh n d u Universal Transverse Mercator Projection (UTM), Zone 20, Central Meridian 63°00' (2-5°) towards the Bay of Fundy; however, more irregular dips locally occur in the Part of NTS Sheets 21A/05, 21A/12, 21A/13, 21B/08 and 21B/09, http://www.gov.ns.ca/natr/meb/download/dp003.asp F f t 4 West. 45°N o ee otia middle member (^Fnmm) owing to the inflation of individual pahoehoe-type flows Kontak, D. J., Dostal, J. and Greenough, J. 2005: Geology and volcanology of the y Sh y Sc a 45°N d 5 va un No during formation. Importantly, zeolites are common in the members and in the case of Annapolis and Digby Counties, Nova Scotia Hodych, J. P. and Dunning, G. R. 1992: Did the Manicouagan impact trigger end-of- Jurassic North Mountain Basalt, southern Nova Scotia; Geological Association of B f F 4 y o North American Datum (NAD) 1983 Canadian Spatial Reference System (CSRS) 98. the middle member (^Fnmm) pervasive. Full details of previous work, zeolite Triassic mass extinction?; Geology, v. 20, no. 1, January, p. 51-54. Canada-Mineralogical Association of Canada, Field Trip Guidebook B3, p. 130. 3 a 3 et B he 2 occurrences and formation and the physical volcanology are found in the selected S
1 Sable Base and digital data derived from the Nova Scotia Topographic Database (NSTDB), references. D.J. Kontak and T.L. Webster Keppie, J. D. (compiler) 2000: Geological map of the Province of Nova Scotia; Nova O'Reilly, G. A., Demont, G. J., Fisher, B. E. and Poole, J. C. 2009: Nova Scotia Island t 2 Copyright Her Majesty the Queen in Right of the Province of Nova Scotia. The Scotia Department of Natural Resources, Minerals and Energy Branch, Map ME mineral occurrence database; Nova Scotia Department of Natural Resources, ee n Sh 44°N ea 44°N Disclaimer Mineral Resources Branch Oc NSTDB is available from Service Nova Scotia and Municipal Relations (SNSMR), Scale 1:50 000 2000-1, scale 1:500 000. Digital Product ME 2, Version 10; tic lan Land Information Services Division (LIS), Nova Scotia Geomatics Centre (NSGC), At The information on this map may have come from a variety of government and 1012345km http://www.gov.ns.ca/natr/meb/download/dp002.asp Open File Map ME 2010-9 Amherst, Nova Scotia. t 1 Map Series ...... nongovernment sources. The Nova Scotia Department of Natural Resources does Kontak, D. J. 2002: Internal stratigraphy of the Jurassic North Mountain Basalt, ee Sh not assume any liability for errors that may occur. This map is intended for use at the Halifax, Nova Scotia southern Nova Scotia; in Minerals and Energy Branch, Report of Activities 2001, ed. Pe-Piper, G. and Miller, L. 2002: Zeolite minerals from the North Shore of the Minas Dec 17, 2010 Current Extent ...... Shaded relief image derived from a 5 m LiDAR bare-earth Digital Elevation Model of 2010 0100200km published scale of 1:50 000. D. R. MacDonald; Nova Scotia Department of Natural Resources, Report ME 2002-1, Basin, Nova Scotia; Atlantic Geology, v. 38, p. 11-28. ± NTS Map Sheets . . . . . the North Mountain area, Nova Scotia, DP ME 455, Version 1, 2010. Azimuth of 315° Crown Copyright © 2010, Province of Nova Scotia, all rights reserved. p. 69-79. and sun angle of 45°. Compiled by T. Webster. Composite of several individual Webster, T. L. 2010: Shaded relief image derived from a 5 m LiDAR bare-earth 02040km 64°W 60°W Recommended Citation surveys dating back to 2000. The Annapolis Valley section of the North Mountain was Kontak, D. J. 2006a: A geological map of the Jurassic North Mountain Basalt, Digital Elevation Model of the North Mountain area, Digby, Annapolis and Kings 44°N acquired by the Applied Geomatics Research Group with funding from the Canada Kontak, D.J. and Webster, T.L. 2010: Bedrock geology map of basaltic rocks of the southern Nova Scotia: a 200 km transect from Cape Split to Brier Island; in Program Counties, Nova Scotia; Nova Scotia Department of Natural Resources, Digital 66°W 65°W Foundation for Innovation (2000, 2003, 2004). The Digby Neck, Long Island and Brier North Mountain Formation from Centreville to Bogart Lake, part of NTS sheets with Abstracts; The Atlantic Geoscience Society, 32nd Colloquium and Annual Product ME 455, Version 1; http://www.gov.ns.ca/natr/meb/download/dp455.asp Island sections were acquired by the Applied Geomatics Research Group with 21A/05, 21A/12, 21A/13, 21B/08 and 21B/09, Annapolis and Digby counties, Nova Meeting, February 3-4, 2006, Greenwich, Nova Scotia, p. 39. funding from the Geological Survey of Canada (Atlantic), Natural Resources Canada Scotia; Nova Scotia Department of Natural Resources, Mineral Resources Branch, Webster, T. L., Murphy, J. B. and Gosse, J. C. 2006: Mapping subtle structures with (2006). Open File Map ME 2010-9, scale 1:50 000. LiDAR: flow units and phreatomagmatic rootless cones in the North Mountain Basalt, Nova Scotia; Canadian Journal of Earth Sciences, v. 43, p. 157-176.