PRELIMINARY INTER? BET AT I ON OF ELECTRICAL SOUNDING ... · PRELIMINARY INTER? BET AT I ON OF...
23
PRELIMINARY INTER? BET AT I ON OF ELECTRICAL SOUNDING CURVES OBTAINED ACROSS THE SNAKE RIVER PLAIN FROM BLACKFOOT TO ARCO, IDAHO By Adel A, R« Zohdy and William D, Stanley Prepared in cooperation with the Idaho Department of Hater Administration, Atomic Energy Commission, and Bureau of Reclamation* Open-file report 1973 This report is preliminary and has not been edited or reviewed for conformity with U,S* Geological Survey standards«
Transcript of PRELIMINARY INTER? BET AT I ON OF ELECTRICAL SOUNDING ... · PRELIMINARY INTER? BET AT I ON OF...
PRELIMINARY INTER? BET AT I ON OF ELECTRICALSOUNDING CURVES OBTAINED ACROSS THE SNAKE RIVER PLAIN FROM BLACKFOOT TO ARCO, IDAHO
By Adel A, R« Zohdy and William D, Stanley
Prepared in cooperation with the Idaho Department of Hater Administration, Atomic Energy Commission, and Bureau of Reclamation*
Open-file report
1973
This report is preliminary and has not been edited or reviewed for conformity with U,S* Geological Survey standards«
Illustrations
[Figures 1 and 18 In pocket; figures 2-17 follow text]
Figure 1. Index map. 2-17. VES curves:
2. VES 1, 2, 3, and 4,3. VES 5 and 6.4. VES 7 and 8.5. VES 9 and 10.6. VES 11 and 12.7. VES 13 and 14.8. VES 15.9. VES 16 and 17.
10. VES 18, 19, and 20,11. VES 21 and 22.12. VES 23 and 24.13. VES 25, 26, and 27,14. VES 28, 29, and 30,15. VES 31, 32, and 33,16. VES 34, 35, and 36,17. VES 37 and 38.
18. Cross section. -
PRELIMINARY INTERPRETATION OF ELECTRICAL ; SOUNDING CURVES OBTAINED ACROSS THE SNAKE RIVER PLAIN" FROM BLACKFOOT TO ARCO', StfAHO
By Adel A* R. Zohdy and William D« Stanley
During August 1971, the U.S« Geological Survey made 38 d-c
resistivity soundings along a profile from Blackfoot to Arco, Idaho*
The purpose of the survey was threefold: 1) determine the thickness
of the basalt flows of the Snake River Group, which form the main
aquifer in the Snake River Plain, 2) determine the nature of the
materials underlying the basalt, and 3) estimate the depth to the
high-resistivity basement rocks beneath the Snake River Plain,
The locations of the VES (vertical electrical sounding) stations
are shown on figure 1. All the soundings were made with the Schlumberger
AHNB array with electrode spacings (AB/2) often expanded to 12,000 feet*
VES 8 9 VES 12, VES 2 1*, VES 29, and VES 38 were expanded to larger electrode
spacings (up to 58,000 feet) using bilaterial equatorial arrays, and VES 19
was expanded to 68,600 feet using a unilateral equatorial array. VES 15 was
expanded to 68,600 feet using a bilateral polar array; and VES 21 was
expanded to 32,000 feet using a unilateral polar array* The observed VES
\curvesvare shown in figures 2 through 17. The apparent resistivity is platted
on the ordinate axis and the Schlumberger electrode spacing (AB/2 = half
distance between current electrodes), the equatorial spacing (R* * distance
from one current electrode to center of potential dipole), and the polar
dipole 'spacing (r = distance between centers of current and potential
dipoles) are plotted on the abscissa axis.
Figure 18 shows the geoelectric section obtained from the preliminary
interpretation of the VES curves using curve matching procedures (Kalenov,
1957; Orellana and Mooney, 1966). On this section there are five
geoelectrical units. The 1,000-3,000 ohm-mater layer is interpreted as
dry basalt* The 300*600 ohm-meter layer is interpreted as basalt
"saturated with fresh water. The 100-200 ohm-meter layer is interpreted as
basalt flows intercalated with clayey sedimentary rocks. The 20-HO ohm-meter
layer is interpreted as sedimentary rocks and/or rhyolitic ash-flow tuff,
The geoelectric basement at the-bottom of the section has a high resistivity,,i
about 500 ohm-meters or more, and it may represent Paleozoic rocks.
The deep structural trough on the"southeastern part of the profile
is filled with materials having a resistivity of about 40 ohm-meters.
-The-depth to the electric basement in that structure .is estimated to
' be at least 20,000 feet. Whether this structural trough represents a
ealdera or a graben cannot be determined from the available VES data.
References
Kalenov, E.N., 1957, Interpretation of vertical electrical sounding
curves [in Russian]: Moscow, Gostoptelkhizdat, U71 p.
Orellana, Ernesto, and Mooney, H. M., 1966, Master tables and curves , -
for vertical electrical sounding over layered structures: Madrid,
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DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY \
N.WARCO
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17
(PROJECTED) SNAKE RIVER13 12 II KD89 762 15 54332 31 30 29 28 27 26 23 21 19 18
BASEMENT ROCKS VERTICAL EXAGGERATION X2 '
HORIZONTAL SCALE
0 5 MILES
Figure 18. Geoelectric section across the Snake River Plain, from Blackfoot to Arco, Idaho. Solid triangles and numbers designate location and number of VES stations. Solid circles above certain station numbers designate deep soundings made with equatorial or polar arrays.
EXPLANATION
1,000-3,000 OM
300-600 QM
100-200 OM
L320-40 QM
BLACKFOOT
OPEN FILE 1973
S.E.
U.S. Geological SurveyOPEN FILE REPORT
This illustration is preliminary and has not been edited or reviewed for conforiaity with Geological Survey standards.
DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY
IDAHO FALLS
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SECTIONIZEO TOWNSHIP
Two 'an"S wi<>: Federal routa markerrOWNlHlP OR RANGE LIME
Base from U.S. Geological Survey, 1955-62
Prepared by th« Army Map S«rvic« (ASSX). CorDi of Enginwrj. U.S. Army. Washington. D.C. Compiled in 19&5 by photogrimmetric methods and from USGS quedrangUs. 1:24,000. 1:62.500 and 1:125.000. 1925-51. Planimetric detail revsed by photo-planimetnc methods. Horizontal and verticil control by USGS, USC&GS. and CE. Photog raphy field annotated 1954-55. Limited revision by U.S. Geological Survey. 1962.
100.000 foot ends based on Idaho coordinate nrttem, central end East zone*
10.000-meter Universal Transverse Mercator grid ticks, zone 12, shown In blue
U.S. Geological SurveyOPEN FILE REPORT
This map is preliminary and has not been edited or reviewed for conformity with Geological Survey standards.
O»«r r
loo.ooo n. 500 ooo _25.000 to-100 tOO _ 5 CO) lo J' 00__
LEGENDROAD DATA 1955 PARTIALLY REVISED 1962
I in red dene'* iDS'C»,mate disUrcn in rnilei between stars ROADS
Herd surface, heavy dutyLOS ANGELES M°"-^"n«^.QMAHA
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.GALVESTON____Loromi*__Ofond Couie* Improved light duty
. Sun Valley Unimproved dirt.Trail________
s *ideTwo lanes wio<; Snti. Innritite route markri.^ CONTOUR INTERVAL 200 FEET
WITH SUPPLEMENTARY CONTOURS AT IOO FOOT
TRANSVERSE MERCATOR PROJECTION
Narrow I BOUNDARI1 i
Iritarrutu State_
County.
irport -
S«plene airport
$U(*ar» ancnoraoe-
_._ Wo<x»s-bru»lH«od_
f^i Landmarks: School; Church; Other, ft
' Horizontal control polnl __________
-,_ Spot elevation in feet ______. . .
.'i' Marsh or t*imp______ t^' _ <a-
_ ! Intermittent or dry stream_ ^_ ,^~-
__j Power line_________ .__ __.
B«tLIP..TIOI« F0« THIS SHEIT V.R ES FRO- I / « Mt
T PC;« TH« 1* -»"** *
Figure 1. lnd.-xAooroxinwta revA almement __ i __
showing location and mnrber of vertical electrical stations, Idaho Falls quadr«nfl«» Idaho.
41*
1LOCATION DIAGRAM FO
118'
QRANacvtiLe NL 1V8
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IDA
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NEVADA NK 11-9
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IDAHO FALL1
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POCATELLU
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I AND '..RANT BOUNDARY
6 | 5 I 4 i 3 i 2 i I
7 fa ! 9 ' w : n : 12
18 ! 17 : 16 15 H 13
19 : 20 : 21 22-21-24
30 I 29 \ 28 : 27 . 2fi 25
"31T Sp 33 14 » 36
IDAHO FALLS, IDAHO1955
LIHITCO HIVIVOH !» «
