Page 194 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

fold-and-thrust belt
1.5 s
faults of
permission of
Flexural normal faults
141-170,
of the
to
Mountain
: underthrusted shelf strata,
Ae
the northwest, cuts downsection
E. Schweig, III,
oe
of Precambrian crystalline
the
Paleozoic
of
1981;
the
reflec-
distance
décolle-
the
separating
Indian
High
6.37d).
beneath
Green
al.,
base-
by thrust
and
Ouachita
belt,
Dame
rift-
and
con-
belt);
reflections
be
fore-
177
over-
col-
permission
Omae ems , vol. LO, pp.
zone
mark
may
et
of
6.38).
beneath
Ridge
Waco
a
that
with
to
orogenic
Pine
1979;
underthrusting
Appalachian
fold-and-thrust
of
and
the
(Harris
Dipping
profiles
the
the
Fig.
faults are overridden
Settings
Notré
due
margin
a
a
km
considerable
foreland
front
to
1990. Redrawn
kinematic evolution of the
suggest
(Fig.
suggest
late
of
within
the
involves
with
the
Lesser
and
Blue
zone
1986),
interpreted
wedge-shaped
al.,
see
zones
foreland basin deposit. b)
100
as
top
Redrawn
margin
Massif
the
Appalachian/Ouachita
in
and
seismic
R. VanArsdale
deformation
6.36a).
1979;
the
continental
Province, the
et
interpreted
of the
of Tectonic
dipping
the
profiles
structures
Uplift
than
profiles
al.,
in
suture
the
1983),
(Cook
continents
southern
near
top
America
1030-1037, ©
including
basement-cored,
the
al.,
Aar
(foreland
passive
et
1988.
(Fig.
for
1975);
rocks
more
the northwest. The
of
been
basal décollement, at 0.6 s on
Benton
flexural
Stewart
gently
reflection
of
zone
et
al.,
tall .
mark
reflection
100, pp. 72-99,
©
Georgia
United States, From
extends
Ridge
rocks
Expression
rocks
Dipping,
the
of
top
(Cook
the
are
crystalline
for
Rozendal,
the
Cambrian
have
et
variety
North
décollement
A
of
Mountains. From Three-dimensional geometry and
the American Association of Petroleum Geologists, Tulsa, Oklahoma, USA. The
Near
ee Cine Oni
Province
to
from
the
from the Valley and
Lillie
a
structures,
vol. 74, pp.
strata,
extend
1983;
crystalline
In
younger molasse is a superimposed
the
suturing
crystalline
is
1985)
interpreted
Mountains
rocks
Seismic
when
in
Seismic
6.35b,c).
décollement
Cc.
to
1981).
1983),
structures
1982;
Seismic
great
1966).
the
the décollement on
Structures
Appalachians
al.,
shelf
farttier, beneath
and
Proterozoic/Early
strata
vol.
continent
al.,
Ridge
Bulletin,
crystalline
deformed
Along
the southern
The
the
et
Bulletin,
. Geophysical
the
al.,
a
et
(Nicholas
and
1991).
al.,
materials.
basement-cored
1979,
al.,
Structures
beneath
(Fig.
the
reveal
Julien
shelf
Nelson
of
.
are
Appalachian
that
Geological Society of America, Boulder, Colorado, USA. The
and
et
Interpreted, migrated time section
strata
et
Basin, AAPG
et
‘
and
Reflections
nature
depth.
beneath
and
A
(Nelson
African
Mitra, GSA
al.,
reflections
Bally
rocks
al.,
(Ando
suggest
that
Valley
be
(St.
strata
profiles
beneath
in
southern
et
Décollement
Strata
1982;
beneath
Texas
completely
underthrust
of sedimentary
Basin
et
to
even
Basement Involved
antiformal
km
Hubbard
show
(see
Quebec
overthrust
begins
Late.
completely
the
(Cook
the
range,
Arkansas
Vermont
from Tibet
Subsurface structure of the eastern Arkoma
Smithson,
thrust system, southern Appalachians, by S.
from the Arkoma
15
in
southern
Underthrusted
extend
Zone
undeformed strata
Reflection
Miocene and
of strata
extends 6.39).
km)
of
Similar
large,
of
data
uplifts
the
the
to
rocks
basement
suturing
in
mountain
1984;
10
Piedmont
100
from
from
the
Suture
(Fig.
Thrust
beneath
reflection
shelf strata
Anticlinorium
beneath
of
in
reaches
River
reveal
deformation
6.36b).
the
and
data
wedge
6.374),
sedimentary
than
reveal
southern Appalachian
Lillie,
Mountains
Mountains
overthrust
hinterland.
Himalaya
fill
(continued)
of
in
Iverson
time section
7.
Recent
6.
tinental
Ouachita orogen.c)
5.
4.
craton
graben
(more
Devils
lisional
the southeast. Note
tions
ment
zone
thrust
Inner
intact
(Fig.
ment
Alps
1981; ?
lines
land,
(Fig.
the
6.37
migrated
FIGURE
of the
the
on
on
at D.C. Note Union, Washington, of the American northwest, 2.6 s permission Redrawn Precambrian with 1991. © basement at 2.0s on top of overlying southeast. Southeastward dipping reflections beneath shelf on passive continental margin. Precambrian late the with (Figs. 6.25; 6.30a), associated fill rift graben to as due inter
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