geothermal resource potential of the safford-san simon basin, arizona

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Geology Subsurface geology controls the distribution of the confined aquifers. These confined aquifers are contained in permeable sediment, which is overlain by an impermeable cap rock. Drillers' logs of the San Simon area were interpreted to delineate subsurface stratigraphy and locate the thickness and lateral extent of the confining cap rock. In the San Simon area, artesian wells tap water contained in sand and gravels, which are below a blue clay. This blue clay is probably correlative with the green clay facies of Harbour (1966) at Safford. Fortunately, the blue clay is easily distinguished from other basin-filling sediments; as a result, drillers' logs are highly useful in mapping its subsurface extent and thickness. Figure 26 is a structure contour map at the base of the blue clay. The blue clay is deposited in a wedge-shaped depositional basin bounded by steep structure contours oriented NNW and WNW. A structure contour map of the top of the blue clay (Figure Zn exhibits the same geometry as that seen at the base of the blue clay except that the contours delineating the margins of the deposition basin are not as steep. The closure over the lowest elevation at the top of the blue clay is displaced to the south from the site of the lowest elevation at the base of the blue clay; the closure is adjacent to steep contours oriented WNW. The well showing the lowest elevation for the top of the blue clay records a significant evaporite occurrence. At this location, evaporites overlie the blue clay. The evaporite sequence may represent deposition during the dessication of a lake in closed basin conditions. Structural and tectonic inferences are tentatively drawn from the structural contour maps. The steep structure contours of the blue clay may correlate with faults that control the location of the depositional basin. In addition, faulting contemporaneous with dessication of a late Tertiary lake 71
.- ... - - ~ 0 , ~ ." 17 to ~, '. .. " -" " 2' j ELEVATION AT THE BASE OF THE "BLUE CLAY" Elevation above sea level (Feet). o I Mile L.'__---'I " - ' . ... " Figure 26. Structure contour map of the base of the blue clay unit in San Simon area.- 72
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GEOTHERMAL RESOURCE POTENTIAL OF TH
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TABLE OF CONTENTS PAGE List Of Figu
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FIGURES FIGURE 1 FIGURE 2 FIGURE 3
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TABLES TABLE 1 TABLE 2 2A 2B 2C 2D
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INTRODUCTION o In the Safford-San S
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Land Status Figure 2 shows land own
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asin are published in Andreasen and
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114° 112° IIO O 108° 106° 104°
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I.D ". ". '. ". ..... ",/" '. ~~~ ~
Page 22 and 23:
side of the mountains and coincide
Page 24 and 25:
stress fields may dilate some of th
Page 26 and 27:
I-' Ln !' .. "," "" ,,... P.c Tucso
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The upper basaltic andesite, overly
Page 30 and 31:
over an inferred decollement in the
Page 32 and 33: attitudes of the thrust faults, rev
Page 34 and 35: gradation is observed only in certa
Page 36 and 37: to depth of 555 meters (Knechtel, 1
Page 38 and 39: asal conglomerate facies of the low
Page 40 and 41: Indian Hot Springs-Gila Valley Intr
Page 42 and 43: flow. A fault zone(s) is inferred t
Page 44 and 45: DWG. NO.-R.-IJ.-~ CALCULATED THICKN
Page 46 and 47: Geophysics, 1979). Nearby at Saffor
Page 48 and 49: Buena Vista Area Introduction More
Page 50 and 51: / I / / / / / / / / / / I / / / / /
Page 52 and 53: 33 34 31 T6S T7S
Page 54 and 55: GElEIEEOl'3,53IEEa3lljO Mile E] B R
Page 56 and 57: similar to the Precambrian granite
Page 58 and 59: 100 + + + + 300 + 500 ~ + + + + + +
Page 60 and 61: 500 m interval, while 1.2 HFU is re
Page 62 and 63: tN I \ 5 IOMiles \ ""1. EXPLANATION
Page 64 and 65: are interpreted as evidence of a ma
Page 66 and 67: LINE 7 RESISTIVITY N =2000 FEET, DI
Page 68 and 69: 100 200 0...---..."...-------------
Page 70 and 71: Artesia in D-8-26-32 and 33 have es
Page 72 and 73: trending 1.5 km 2 closures with soi
Page 74 and 75: waters occur in confined or artesia
Page 76 and 77: Equation (1) Alumino-silicate + H 2
Page 78 and 79: Silica concentration in Figure 24 i
Page 80 and 81: San Simon Introduction The San Simo
Page 84 and 85: " " '"",.- ~--- ,....~, ~. 7 '1.v-~
Page 86 and 87: o 1 Mile '2, WATER LEVEL OF WELLS I
Page 88 and 89: Conclusion Geothermal potential at
Page 90 and 91: geothermometry for waters containin
Page 92 and 93: GRAVITY MODEL OF THE BOWIE AREA Mod
Page 94 and 95: TRANSVERSE TOPOGRAPHIC PROALES ACRO
Page 96 and 97: probably correlative with the "blue
Page 98 and 99: excellent chemical quality suitable
Page 100 and 101: Table 1 Wells With Measured Tempera
Page 102 and 103: Table 1 cont. Wells With Measured T
Page 104 and 105: Table 1 cant. Wells With Measured T
Page 106 and 107: Table 2A. Analyses of Gila Valley-I
Page 108 and 109: Table 2B. Analyses of Buena Vista a
Page 110 and 111: Table 2C. Analyses of Cactus Flat-A
Page 112 and 113: Tabl~ 2E. Analyses of Bowie area gr
Page 114 and 115: Table 3A Geothermometers for the Gi
Page 116 and 117: Table 3C. Geothermorneters for the
Page 118 and 119: Table 3E. Geothermometers for the B
Page 120 and 121: Table 4. Summary table showing aqui
Page 122 and 123: Summary of description of Core Lith
Page 124 and 125: D-7-27-2cdb Driller's log Surface s
Page 126 and 127: APPENDIX 2 pH Correction for the Si
Page 128 and 129: By converting milligrams per liter
Page 130 and 131: APPENDIX 3 Arizona Bureau of Mines
Page 132 and 133:
BIBLIOGRAPHY Aiken~ C. L. V., 1978,
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-3- Davidson, E. S., and Cooley, M.
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-5- Fournier, R. O. and Truesdell,
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7 Marjaniemi, ,D. K., 1968, Geologi
Page 140 and 141:
-9- Scarborough, R. B., 1975, Chemi
Page 142:
Van Horn, W. L., 1958, Late Cenozoi
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geothermal resource potential of the safford-san simon basin, arizona

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