C o
n ti
r o c k s
H i g h - a n g l e n o r m
a l
f a u l t i n g a n d r i f t i n g
V o lc
a n ic
a n d
se d im
e n ta
T h
C o n ti
n e n ta
O l i g o c e n e
P a l e o
z o
i c
C r e t a c e o u s
L o w
M i d d l e
U p p e r
P a l e o c e n e
P l i o
f i l l
L o w
Eocene Wilderness granite suite
?
P a le
L o w
M id
d le
P a le
M io
B a si
brittle-ductile transition zone
?
Sequential model of regional tectonic development through time along a transect from the Tucson Basin to the Galiuro Mountains
Strongly folded and cleaved phyllitic metasedimentray rocks
Paleozoic platform deposits of limestone/dolomite
Alluvial fan and braidplain facies with local megabreccia deposits
Alluvial fan and braidplain facies that contain alternation of sand and clay,
sandy clay with gravel
Andesite to dacite lava and andesite to rhyolitic tuffs intruded by dikes and plugs
Conglomeratic redbeds of alluvial fans, braidplain and lacustrine facies,
alternation of volcanic and sedimentary rocks that show growth strata
Mostly cobble to boulder sized conglomeratres with fine-grained
sandstones that are interbedded with each other
Andesite breccia and lava tuff, lahars, fluvial sediments
Rift basin sediments deposited by distal alluvial fan and braided-stream deposits
containing sandstones and mudstones with traces of siltstones and some large
conglomerates
gravels and boulders
Dacite to andesite lava flows and flow breccias with lesser fluvial conglomerate
and sandstone, eolian quartz arenite, debris-flow
deposits
consisting of monzodiorite, rhyolite porphyry, quartz-poor granite, alkali rhyolite
Generalized stratigraphic column for the Tucson Basin, Catalina Mountains, and surrounding region with stratigraphic relationships
SW NE
Tucson Mt./Tucson Basin Catalina Mt./San Pedro Valley/ Galiuro Mt.
Pinaleno Mt./Safford Basin/ Gila Mt.
Exxon State 32 (~3830 m) Well-log data (Wagner, 2005)
MP
Late Jurassic to early Cretaceous
Late Cretaceous to early Tertiary (?)
Mid-Tertiary (Oligocene to early Miocene)
Late Tertiary (mid-Miocene to Pliocene)
High-angle block faulting
Low-angle normal faulting
West-northwest dipping high-angle normal faults
B
B
C
C
D31
GDF
EPD
PF
MRF
X
Y
Abbreviations
CDf: Coyote detachment fault AVF:Altar Valley fault AVf: Avra Valley fault
CDF: Catalina detachment fault GDF: Galiuro detachment fault
EPD: Eagle Pass detachment fault PF: Pirate fault
MRF: Martinez Ranch fault
Baboquivari Mountains Tucson Mountains
San Pedro Trough
Soza Mesa Fault - abandoned “breakaway 2”
eroded “breakaway 1”
mylonitic shear zone
Central Galiuro Fault
Seismic reflection control
Safford BasinAravapai-Sulphur Springs Valley
Eagle Pass Detachment Fault
Seismic reflection control
Detachment Surface
A-1 well
3
Lithology Thickness (m)
Tertiary Granite SuiteLaramide intrusions
Schematic kinematic model along a transect from the Baboquivari Mountains in the southwest to the transition zone of the Colorado Plateau in the northeast
PLATE 2 of 2
Correlation of units along a transect from the Baboquivari Mountains to the transition zone of the Colorado Plateau
(Not to scale, vertically exaggerated)
crustal f low in mid-crustcrustal f low in mid-crust
upwarping due to isostatic rebound
upwarpi ng dueto isostatic
SW NE
SW NE
SW NE
SW NE
SW NE
SW NE
SW NE
Basin-and-Range high-angle normal faulting
upward translation of rock masses Isostatic footwall uplift
accompanying Basin -and-Range faulting
?
C
A
B
D
deep exploration well
Plutonic rocks
Late Cenozoic basin fill (mid-Miocene-Pliocene)
Non-mylonitic preCambrian crystalline rocks
High-angle Basin and Range faulting (Late Tertiary)
Mid-Tertiary volcanic and sedimentary rocks (mid-Oligocene)
Mesozoic sedimentary and volcanic rocks (Lower to Upper Cretaceous)
Laramide thrust fault (Late Cretaceous- Early Tertiary (?)) or low-angle normal fault (?) beneath San Pedro trough
2-D seismic reflection profiles
PreCambrian metamorphosed sedimentary rocks
D36
D42
CX12A