Idea Transcript
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EAST
U-20z
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U-19an UE-19z/Inst. 4,689
U-19ax
U-19e 4,698
U-19ba 4,849 U-19t
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WEST
U-20az 4,412
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U-19f
RO
T
ND
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UL
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AK PE AM
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GH
FAULT
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RA EK
RE
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UE-18r 4,173
Wa
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AL
KA
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LI
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Wash
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R
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FL
AT
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AC
EC
MPLEX O C
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IN AS BB SU NC
H
IN AS BB SU EY LL VA
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SIS
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OA
TAIN C N ALDE R A U O
880 000
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GE
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AN
TIMBE R M
SIT
ER
ST
AS
TE
EB
DA
RC
VA
NE
FO
Water Well 8 4,619
Area 18
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SPLIT
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IR
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Fo r k
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RIDGE
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Area 20
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C
RU SC
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Thi rs ty
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A
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900 000
FA
ME AL
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LLI
880 000
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NE
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n
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l l UE-19w 1
U-20as 4,214
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U-19aa
UE-19fS 4,429
U-20ag U-20y 4,190
U-19az 4,673
U-19aq 4,690
U-20be 4,278 900 000
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GREEL EY
ST EA
U-19x 4,567
T
l UE-20c 4,157
U-19af
U-19ae 4,495
37°15'
UE-19i 4,581 U-19v
UE-20av 4,330
U-20av 4,389
U-19ab 4,904
U-19i U-19v PS 1D 4,545
U-20bg 4,438 U-20ax 4,362
U-19ab 2/Inst. 4,915
FAUL
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U-20ao 4,322
U-19p
U-19av 4,490
U-19au 4,458
U-20a 2 Water Well 4,408 U-20n U-20a 1 UE-20n 1 4,327
U-20t
U-20c 4,184
FAULT
FAU LT EO BUT
WEST PURSE FA ULT
U-20bf 4,436
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T WE S
FAUL T CAR BOX
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U-20 Water Well 4,440 U-20ac
U-20d U-20ak UE-20d 4,193 4,178
U-20at 1/Inst. 4,214 U-20bb
U-20ah 4,444
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l l Pahute Mesa Ex 3 4,366
U-20b
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UE-19c Water Well 4,697 U-19c
U-20ap
U-20bd 4,448
U-20ay 4,465
T
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U-20at
U-20am 4,451
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U-19aS U-19bg 4,569 U-19bg 1 U-19ad 4,575
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U-20ai 4,451
U-20ae U-20bb 1 4,202
U-20ab 4,455
920 000
U-19ay 4,584
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U-20bc 4,275
U-19yS
UE-20h 4,452
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U-20aq
U-19ac U-19ar 4,587
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FAUL XCAR T BO
UE-20f 4,162
U-20aL
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WES
U-20f
U-19q Pahute Mesa Ex. 1 4,459
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U-20k
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U-20v
U-20aw 4,499
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U-20af
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U-20ad
U-19zS
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U-20i
UE-19e/Inst. 4,702
FA
U-20an 4,471
ULT
U-20g 4,453
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FAULT
U-19aj
ALMEN DR O
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PUR SE
U-19am
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stru
UE-19gS 4,674
LE
FAULT
ND
gin r a lm a r U-20aj ctu U-20aa
GR EE
FAU LT
LE Y
4,478
UE-19b 1 4,685
U-19g 4,670
U-20e 4,463
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HA
U-19b
UE-20e 1 4,471
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wall c i h ap r U-20ar og p to U-20ar 1/Inst.
20 a Are
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U-19ai 4,688
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RY ES
TU A
l 940 000
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U-19n
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UE-19h 4,668
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U-20m 4,633
920 000
,
U-19ak U-19d
U-19L
20
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940 000
37°15'
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U-19d 2 4,684
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U-20p UE-20p 4,669
BLACK MOUNTAIN CALDERA
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U-20u
SILENT CANYON CALDERA COMPLEX
U-19u
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Pahute Mesa Ex. 2 4,734
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GROUSE CANYON CALDERA
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U-20 Well or test hole–Label identifies well or hole. Number, if given, is Water Well measured water-level altitude, in feet above sea level. (See table 5 for 4,440 additional information on wells and test holes)
37°22'30
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Detonation more than 150 feet above water table. Yield less than 150 kilotons
SILENT CANYON CALDERA COMPLEX
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Detonation between 150 feet above and 350 feet below water table. Yield generally less than 150 kilotons
NEVADA TEST SITE
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TIMBER MOUNTAIN CALDERA COMPLEX
37°07'30"
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960 000
GE
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Detonation more than 350 feet below water table. Yield generally greater than 150 kilotons
U-19ae 4,495
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Site of underground test–Symbol and label identify emplacement hole in which test was detonated. Symbol size approximates estimated diameter of cavity and fracture zone generated by detonation. Number, if given, is measured water-level altitude, in feet above sea level. (See table 5 for additional information on tests)
U-19av
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RAN
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37°15'
Line of section—Symbol indicates control point
U-19v
AREA 20 CALDERA
TED
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Fault—Approximate trace at surface
M e s a
RANGE
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K BLAC AIN T MOUN ERA CALD
Deadhorse Flat Formation of Belted Range Group–Lava
37°22'30
GROUSE CANYON CALDERA
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Intracaldera Bullfrog Tuff of Crater Flat Group–Tuff
A'
S a u c e r
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Calico Hills Formation–Lava
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37°22'30"
620 000
BEL
Paintbrush Group–Welded tuff and lava
116°22'30"
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Timber Mountain Group–Tuff
600 000
KAWICH
116°30'
EXPLANATION
116°22'30" 580 000
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560 000
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116°30'
540 000
A
Laczniak and others, 1996, Summary of hydrogeologic controls on ground-water flow at the Nevada Test Site, Nye County, Nevada
U.S. DEPARTMENT OF ENERGY
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U.S. GEOLOGICAL SURVEY
960 000
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Prepared in cooperation with the
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U.S. DEPARTMENT OF THE INTERIOR
WATER-RESOURCES INVESTIGATIONS REPORT 96-4109 Water levels, underground tests, and water-bearing units in Pahute Mesa—PLATE 4 OF 4
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UE-18t 4,285
37°07'30
540 000
560 000
116°30'
Base from U.S. Geological Survey digital data, 1:100,000, 1981; Universal Transverse Mercator projection, Zone 11. Shaded-relief base from 1:100,000-scale Digital Elevation Model; sun illumination from northwest at 30 degrees above horizon 100,000-foot grid based on Nevada State Plane coordinate system, central zone
580 000
116°22'30"
620 000
600 000
Geology by D.A. Sawyer, 1991 0
1
1
0
1
MILES
1
2
3
2
3
4
5
4
6
7
8
KILOMETERS
A. Geologic Section A
A'
Timber Mountain caldera complex
EXPLANATION
Silent Canyon caldera complex
Units on geologic section—Units are defined in terms of stratigraphy and geochronology
Area 20 caldera
Alluvium
Bullfrog Tuff of Crater Flat Group
Thirsty Canyon Group
Dead Horse Flat Formation of Belted Range Group
Timber Mountain Group
Grouse Canyon Tuff of Belted Range Group
Paintbrush Group
Volcanics of Big Dome
fau tua
ry
U1 U- 9d2 1 U- 9u 19 ak
Ea
Es
st
U19 UE am -19 gS
Gr ee
ley
lt
fau
lt
x.1 aE te Me s hu Pa
Ea
We U- st G 2 r U- 0ameeley 20 fau ab lt
U20 U- b 20 ay Bu teo fa U20 ult bd
Bo st
st We
c 20
U20
8,000
U-
y
Bo
FEET
xc
xc
ar
ar
fau
fau
lt
lt
Grouse Canyon caldera
Kawich Range
FEET Kawich Valley
8,000
SEA LEVEL
SEA LEVEL
Calico Hills Formation
-8,000
-8,000 NO VERTICAL EXAGGERATION
Older Volcanics
Units on hydrogeologic section—Units are defined by their physical properties that depend chiefly on mode of eruption, cooling history, and alteration. Units are delineated only beneath water table
Welded-tuff aquifer
B. Hydrogeologic Section lt Pahute Mesa Ex.1
Tuff-confining unit lt
Kawich Range
Es
tua
ry
U-19d2
fau
ey Ea fau st G ree lt l
ley ee st We
fau teo Bu
Gr
lt
ar xc Bo
st Ea
We
Area of downward flow
fau
lt fau
fau ar xc
Nevada Test Site
st
8,000
Nellis Range
Bo
FEET
Lava-flow aquifer
A' lt
A
FEET 8,000
Contact—Dashed where uncertain or inferred. Short dashed line on hydrogeologic section shows geologic contacts in unsaturated rock. Dotted line on hydrogeologic section shows lithologic contact within geologic unit
Kawich Valley
Water table
Fault
Water table SEA LEVEL
SEA LEVEL
Recharge zone—Size of arrow is proportional to inferred amount of local recharge
General direction of ground-water flow—Size of arrow indicates relative volume of ground-water flow. Multiple arrows at a location indicate uncertain or multiple flow directions Drillhole—Projected into section -8,000
-8,000 VERTICAL EXAGGERATION X2 0 0
1 1
2 2
3
3 4
4
Drillhole—Falls on section
5 MILES
5 KILOMETERS
MAP AND SECTIONS SHOWING WATER LEVELS, UNDERGROUND TESTS, AND PRINCIPAL WATER-BEARING UNITS IN UPPER 2,000 FEET OF SATURATED ROCK IN PAHUTE MESA AREA, SOUTHERN NEVADA by Randell J. Laczniak, James C. Cole, David A. Sawyer, and Douglas A. Trudeau
37°07'30