esas0602temp_SWFlaresUp-stu

esas0602temp_SWFlaresUp-stu -...

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Unformatted text preview: The
Southwest
flares
up! EARTH
SCIENCE
in ARIZONA
and
the SOUTHWEST Apache
Leap
(cliffs
of
volcanic
rock) Superior,
Arizona (U.S.
Geological
Survey,
2007) Volcanism Igneous
rocks and
landforms Grotzinger
et
al.
(2007) The
Southwest flares
up! 2 Volcanoes
and
other
igneous
landforms
dot
the
Southwest extrusive volcanic centers (locations approximate) Sunset Crater N of Flagstaff, AZ Colorado Plateau Agathla (‘Aghaaãâ, “much wool”) Peak N of Kayenta, AZ, Navajo Nation, Colorado Plateau (exposed by erosion) S S U 60 intrusive Superstition Mountains NE of Apache Junction, AZ Basin and Range - Transition Zone The
Southwest flares
up! 3 Seismology
tells
us that
the
bulk
of
the
Earth is
solid. How
do
liquid
magmas
form? Earthquake Grotzinger
et
al.
(2007) The
Southwest flares
up! Grotzinger
et
al.
(2007) 4 What
makes
rocks
melt
to
form
magma? Laboratory
experiments
show that
3
factors
are
important Higher
Mg,
Fe,
Ca……..Higher
SiO2,
Na,
K Grotzinger
et
al.
(2007) The
Southwest flares
up! 5 Where
are
rocks
melting
today? The
Southwest flares
up! 6 Magmas
form
at divergent
and
convergent
plate
boundaries,
hot
spots Press et al. (2004) and Grotzinger et al. (2007) The
Southwest flares
up! 7 Formation
of
our
present‐day
topography
over
45
My The
Southwest flares
up! 8 After
the
Laramide
Orogeny,
a
plate
sinks and
the
“ignimbrite
flareup”
occurs (Tasa Graphic Arts) (Blair, 1996) The
Southwest flares
up! 9 The
Southwest flares
up! (Baldridge, 2004) 10 Bimodal
(mafic‐felsic)
volcanism
during
“flareup” Crustal
melting Mantle melting (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Southwest flares
up! 11 Caldera
volcanism (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Southwest flares
up! 12 Caldera
volcanism (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Southwest flares
up! 13 Caldera
volcanism (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Southwest flares
up! 14 Caldera
volcanism (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010) The
Southwest flares
up! 15 The
Southwest flares
up! (Baldridge, 2004) 16 San
Juan
volcanic
field,
Southern
Rocky
Mountains,
CO
‐
NM (Condie
and
Sloan,
1998,
after
Lipman) The
Southwest flares
up! 17 San
Juan
volcanic
field,
CO
‐
NM Engineer
Mountain,
near
Silverton,
CO,

from
Molas
Pass
(Semken) The
Southwest flares
up! 18 Superstition
Mountains volcanic centers (locations approximate) The
Southwest flares
up! Superstition
Mountains NE
of
Apache
Junction,
AZ Basin
and
Range S U 60 19 Superstition
and
Goldfield
Mountains The
Southwest flares
up! 20 Superstition
Mountains The
Southwest flares
up! 21 The
Navajo
volcanic
field 80+
mid‐Paleogene
centers: dikes,
necks,
flows,
sills,
maar craters Occur
mostly
along
Laramide monoclines M HM MON UM UPW ENT ARP Bluff MR ME BB RM UT AZ CO NM MESA VERDE CV M AP Kayenta CR GR Shiprock SR SAN JUAN BASIN ED N DEFIANCE UPLIFT M Chinle BP GN 0 50 km Window Rock Gallup The
Southwest flares
up! 22 Maar‐diatreme
eruptions (a) Fallback and base surge Slumping Downwardmigrating interaction zone (b) Bedded pyroclastics Minette and massive tuff-breccia Minette Dike Semken (2003), after Ort et al. (1998) (c) Trachybasalt flows Maar Diatreme Ground water Root zone The
Southwest flares
up! 23 The
Southwest flares
up! L. Crumpler 24 The
Southwest:
volcanically
active
through
the
Cenozoic The
Southwest flares
up! (After
Wiewandt
&
Wilks,
2004) 25 ...
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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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