esas0601temp_Laramide-stu

esas0601temp_Laramide-stu -...

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Unformatted text preview: The
Laramide
Orogeny
lifts
the
Southwest Late
Cretaceous
to
Mid‐Paleogene EARTH
SCIENCE
in ARIZONA
and
the SOUTHWEST Open‐pit
copper
mine,
Morenci,
Arizona
(P.
Kresan) (U.S.
Geological
Survey,
2007) North
America
at
65
Ma
(Cretaceous‐Paleogene
boundary, also
Mesozoic‐Cenozoic
boundary) Western Interior Sea almost
gone Southwest emerges
from interior
sea North
Atlantic now
opening
up (Ron
Blakey) The
Laramide
Orogeny lifts
the
Southwest 2 The
Southwest
at
65
Ma (Ron
Blakey) The
Laramide
Orogeny lifts
the
Southwest 3 Sevier Orogeny gives
way
to Major
deformation
moves
inboard! Laramide Orogeny ~80‐50
Ma “flat‐slab”
subduction The
Laramide
Orogeny lifts
the
Southwest Named
for Laramie
WY (After
Humphreys
et
al.,
2003) 4 The
Southwest
was
at
or
near
sea
level
during
the
late
Cretaceous
Period; the
Laramide
Orogeny
began
the
process
of
lifting
it
high! (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Laramide
Orogeny lifts
the
Southwest 5 The
Laramide
orogeny
“reopened
old
wounds” “Basement‐ cored uplifts” Uplifts
of regions previously faulted The
Laramide
Orogeny lifts
the
Southwest (Baldridge,
2004;
after
Chapin
and
Seager,
1975) 6 Regional
features
of
the
Laramide
Orogeny Arc
volcanism
to
north Uplifts
on
deep‐seated, high‐angle
reverse
faults,
but little
or
no
volcanism
here Flat slab Arc
volcanism
to
south The
Laramide
Orogeny lifts
the
Southwest (Condie
&
Sloan,
1998) 7 Monoclines
formed
by
Laramide
uplift Single‐sided
fold Later
modified
by
erosion Numerous
across
the
Colorado
Plateau Tasa Comb
Ridge
monocline
near
Kayenta, Navajo
Nation,
AZ,
Colorado
Plateau The
Laramide
Orogeny lifts
the
Southwest 8 Hogback
monocline, San
Juan
Basin,
Colorado
Plateau, New
Mexico‐Colorado Exposed
are
marine
and
coastal
sedimentary
rocks
deposited
during Cretaceous
Western
Interior
Sea
first
regression
and
second
transgression. (Semken) The
Laramide
Orogeny lifts
the
Southwest 9 Hunters
Point
 monocline,
S
of
Window
Rock,
Colorado
Plateau, Navajo
Nation,
Arizona (Reynolds) The
Laramide
Orogeny lifts
the
Southwest 10 Raplee
monocline, Monument
Upwarp,
Colorado
Plateau,
UT In
San
Juan
River
canyon The
Laramide
Orogeny lifts
the
Southwest 
(Semken) 11 Limited
magmatic‐volcanic
activity in
the
Colorado
Plateau
and
Southern
Rockies at
the
start
and
end
of
the
Laramide
Orogeny
(but
not
during
flat‐slab
subduction); including
formation
of
laccoliths (Tasa
Graphic
Arts) The
Laramide
Orogeny lifts
the
Southwest 12 Carrizo
Mountains,
Colorado
Plateau,
Navajo
Nation far
northeast
AZ 
Dziã nahooziãii (The Mountain that Gropes Around) (Semken) The
Laramide
Orogeny lifts
the
Southwest 13 Henry
Mountains,
Colorado
Plateau,
near
Arches
National
Park,
southeast
Utah The
Laramide
Orogeny lifts
the
Southwest (Reynolds) 14 Many
of
the
Southwest’s
copper
deposits formed
by
volcanic
activity
during
the
Laramide
Orogeny. The
Laramide
Orogeny lifts
the
Southwest 15 ...
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This note was uploaded on 03/01/2011 for the course GLG 394 taught by Professor Semken during the Fall '10 term at ASU.

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