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SOURCES OF INFORMATION
©
Geology compiled from published and unpublished maps
and reports of the Ontario Geological Survey and the Geological Survey of Canada, and unpublished data o n file
with the Ontario Geological Survey.
Base map assembled by the Ontario Geological Survey.
Geographic information, derived from maps 21-6, 22-6,
23-6, 24-6, 25-6, 26-6, 27-6 and 28, by the Surveys and
Mapping Branch, Ontario Ministry of Natural Resources,
was compiled onto a Lambert Conformal Conic Projection
with standard parallels 49° N and 7 7 ° N, central meridian
9 2 ° W and grid origin 0 ° N 9 2 ° W provided by Dataplotting
Services, Markham, Ontario.
Ministry of
>>y r ^ V ,
Northern Development
and Mines
z « ; S
^?C« ^
#,
Ontario
*«HP^
MAP 2577
For information as to the status a n d extent of all restricted
lands in Ontario, users are referred to the provincial or federal agency within whose jurisdiction the lands are administered.
Geology not tied to surveyed lines.
ACKNOWLEDGMENT
Digital plots of colour separations produced by Environmental Information Systems Division, Environment Canada.
EAST-CENTRAL SHEET
CREDITS
Compilation and interpretation by staff of the Precambrian
Geology and Engineering and Terrain Geology sections of
the Ontario Geological Survey, as noted in the Explanatory Notes and Legend (OGS Map 2583).
Cartographic production by staff of the Publication a n d
Cartographic Services unit of the Ontario Geological Survey, as noted in the Explanatory Notes and Legend (OGS
Map 2583).
Every possible effort has been made to ensure the accuracy of the information presented on this map; however, the
Ontario Ministry of Northern Development a n d Mines
does not assume any liability for errors that may occur. Users may wish to verify critical information.
Issued 1992.
Information from this publication may be quoted if credit is
given. It is recommended that reference to this map be
made in the following form:
Ontario Geological Survey 1992. Tectonic Assemblages
of Ontario, east-central sheet; Ontario Geological
Survey, Map 2577, scale 1:1 000 000.
NOTATION EXAMPLES
7 - 9 gcf WP (7)
age range
composition/petrogenesis
suite
predominant age range
age range: see Legend
composition/petrogenesis: see Rock Composition a n d
Petrogenesis
>0°
suite: see Assemblages, Suites, Dikes or Sills
predominant age range: see corresponding range and
rock type in L e g e n d 3
Tectonic assemblage:
12 3 N S (2) I 3 4 0 0 1 0 2 9 0 0 M a ; N o r t h S P ' r i t a s s e m b l a 9 e :
' ' predominantly volcanic rock within the age
range 3400 to 3000 M a
Supracrustal rocks not subdivided into assemblages:
7 fi ,., I 2900 to 2710 Ma; predominantly volcanic
e w
rock within the age range 2900 to 2800 Ma
i
|
Plutonic suite:
777] I 2710 to 2690 Ma; granite-granodiorite; Wil™
liams suite
Plutonic rocks not subdivided into suites:
I 4 6 * / 5 \ | 2900 to 2710 Ma; tonalite-granodiorite, fol atec t0
'
' 9 n e ' s s ' c : predominantly plutonic
rock within the age range 2800 to 2730 M a
I
l
i
Depositional s e q u e n c e d
P5
a
Rock type within a given age range is indicated by colour; see Legend.
b
A depositional sequence consists of a package or interval of genetically related sedimentary rocks which
are commonly bounded by unconformities.
c
Age ranges assigned to depositional sequences
areestimated from ages assigned to Period
boundaries.
\
J
• .
432to417Mac
f r 49°
SYMBOLS
m\
-~
Geological boundary
Lamprophyre, kimberlite dikes and
diatremes, fenitic rocks, alkalic
rocks (age indicated, age unknown);
see Legend
||jL
l|pc
H
I' 0
Subsurface lamprophyre, kimberlite
dikes and diatremes, fenitic rocks,
alkalic rocks (proven, geophysically
interpreted); age unknown
Carbonatite-alkalicintrusive
bodies (age indicated, age unknown);
see Legend
Subsurface carbonatite-alkalic
intrusive bodies (proven, geophysically
interpreted); age unknown
Dike (traceable on surface,
traceable in subsurface); see
Legend
P*H
j
HH
_,., j
^^W.
___•_ |
^T^? i
H|| J
" i
•^^
'
^*
•^\b
!
-y-y
rftmite^!
i
• A
® ®
/
/
/.
/
/
/
X.^.X-A.^.^^
1
Regional younging direction
i
Age determination (sample location);
see Absolute Age Determinations for
results
J
Interpreted centre of volcanism
1
6-7g(l»
I I
1
I |
I| j
J L | y | j | |
pi i
!
8-9(9).
<$) ©
Anticline, syncline; with plunge . . .
Unconformity
/•
0
Fault and deformation zone (normal,
reverse, unsubdivided); where present,
/
/
/
arrows indicate sense of transcurrent
W y
/
motion
/
A
/
Unsubdivided Precambrian faults
traceable below Paleozoic or Mesozoic
/
rocks; these faults have no proven
•
Paleozoic or Mesozoic displacements .. /
Thrust fault (shallowly dipping,
j
J.
vertical to steeply dipping)
/
T
Lggg/n !
i
j
9)
i
j
i
j
•-J^i
•
_
Y
•
(HD
*
International boundary
mmmmmmmmm
Interprovincial boundary
mmmmmmmmm
District, County boundary
Multilane highway
a
King's highway
Secondary highway
M
Elevation (land, water)
The positions of all boundaries
approximate.
585m
184m
and surveyed lines are
Scale 1:1 000 000
Kilometres 20
0
Miles 10
_
20
J.)
40
10
20
60
30
80
40
100 Kilometres
50 Miles