RESEARCH· ·1970·

More documents

Recommendations

Info

GEOLOGICAL SURVEY RESEARCH 1970 A DIE FOR PELLETIZING SAMPLES FOR X-RAY FLUORESCENCE ANALYSIS By BRENT P. FABBI, Menlo Park, Calif. A.bstraot.-The preparation of pellets of powdered geological samples is a critical step in X-ray fluorescence analysis; A special die has been ~esigned to produce smooth surfaces on (}Xtremely durable pellets and to provide a protective, hard outer ring and bacl
Bl88 ANALYTICAL METHODS 3" 2%" Outer shell w ~ ~ ~L w l Section A-A T T I I I I I I I I I I I I I _,-l~o 0 l v_~--1 ~. ~ I''- '':::::.., I Piston 1--1.3745"----j J ~ ...... l~ FIGURE 1.-Die for pelletizing samples for X-ray analysis. Plan view of sections. of CrOa and HzS0 4 to remove any alkalies, and then rinse. Dip the lenses in HOI containing a few drops of Hz0 2 to remove Cr, and rinse. Flush with distilled water and dry by placing the lenses between two large filter papers. · RESULTS AND DISCUSSI'ON Four replicate (1 :1, sample to chromatographic cellulose) pellets of the U.S. Geological Survey basalt standard, BCR-1, were prepared to determine sample homogeneity and pellet reproducibility. The average particle size observed with a microscope was 20/-L; however, some flakes of biotite were 60f.L. The samples were counted at the Fe peak and the Si peak for 1 million counts, the theoretical counting error being 0.20 percent at 2u. The relative deviation when counting Fe is 0.40 percent for the four replicates. Hence, at an Fe 2 0a value of 13.29 with 95-percent confidence, one could expect 13.29 X 2 (100.400) 0 . h = ± .11 percent or we1g t percentage FezOa = 13.29 ± 0.11 percent, whereas the theoretical value obtainable is 13.29 ± 0.03 percent. The relative deviation when counting Si is 0.32 percent for the four replicates. Therefore, at a SiOz value of 54.50 percent with 95-percent confidence one could expect 2(0.32) . h 54.50 X = ± 0.35 percent or we1g t percentage Si0 2 = 54.50±0.35 percent, whereas the 100 theoretical value obtainable is 54.50±0.11 percent. With respect to Si0 2 , the relative deviation of 0.32 percent suggests that the glass lenses do not con taminate the sample with Si0 2 • The relative deviation figures of 0.40 percent for Fe and 0.32 percent for Si include errors due to counting, placement, specimen inhomogeneities, uneven specimen surface, and mineralogical effects. REFERENCES Adams, P. B., 1969, The biology of glass : New Scientist, v. 41, no. 630, p. 25-27. !..'
Page 1 and 2:
. ., GEOLOGICAL SURVEY RESEARCH·
Page 3 and 4:
CONTENTS GEOLOGIC STUDIES Petrology
Page 5 and 6:
GEOLOGICAL SURVEY RESEARCH 1970 Geo
Page 7 and 8:
B2 PETROLOGY AND PETROGRAPHY for bi
Page 9 and 10:
B4 PETROLOGY AND PETROGRAPHY has be
Page 11 and 12:
B6 PETROLOGY AND PETROGRAPHY. 32
Page 13 and 14:
B8 PETROLOGY AND PETROGRAPHY TABLE
Page 15 and 16:
BlO · PETROLOGY AND PETROGRAPHY EX
Page 17 and 18:
Page 19 and 20:
GE,OLOGICAL SURVEY RESEA·RCH 1970
Page 21 and 22:
B16 PETROLOGY AND PETROGRAPHY Sprin
Page 23 and 24:
Page 25 and 26:
B20 PETROLOGY AND PETROGRAPHY Sigva
Page 27 and 28:
B22 PETROLOGY AND PETROGRAPHY EXPLA
Page 29 and 30:
B24 PE~ROLOGY AND PETROGRAPHY schis
Page 31 and 32:
Page 33 and 34:
B28 PETROLOGY AND PETROGRAPHY sg•
Page 35 and 36:
B30 PETROLOGY AND PETROGRAPHY Detri
Page 37 and 38:
B32 PETROLOGY AND PETROGRAPHY place
Page 39 and 40:
B34 PETROLOGY AND PETROGRAPHY 66 '
Page 41 and 42:
B36 PETROLOGY AND PETROGRAPHY Post-
Page 43 and 44:
Page 45 and 46:
B40 PETROLOGY AND PETROGRAPHY did n
Page 47 and 48:
B42 PETROLOGY AND PETROGRAPHY Creta
Page 49 and 50:
td :t 106'20' r--- 10' 106'00' 38'3
Page 51 and 52:
B46 STRUCTURAL GEOLOGY FIGURE 4.-Vi
Page 53 and 54:
B48 STRUCTURAL GEOLOGY FIGURE 6.-An
Page 55 and 56:
B50 STRUCTURAL GEOLOGY clined slide
Page 57 and 58:
GE,OLOGICAL SURVEY RESEARCH 1970 CA
Page 59 and 60:
B54 GEOPHYSICS (1950), Domzalski (1
Page 61 and 62:
B56 GEOPHYSICS STRATIGRAPHY AND LIT
Page 63 and 64:
B58 GEOPHYSICS STRATIGRAPHY AND LIT
Page 65 and 66:
B60 GEOPHYSICS value. A normal free
Page 67 and 68:
B62 GEOPHYSICS Hammer, Sigmund, 193
Page 69 and 70:
B64 110°45' GEOPHYSICS L I I \ "'\
Page 71 and 72:
GE·OLOGICAL SURVEY RESEA·RCH 1970
Page 73 and 74:
B68 GEOPHYSICS A' San 0 p A c I F I
Page 75 and 76:
B70 GEOPHYSICS lies occur over rela
Page 77 and 78:
B72 GEOPHYSICS 36° 00' A' 40___./
Page 79 and 80:
B74 GEOPHYSICS igneous massif is co
Page 81 and 82:
B76 GEOPHYSICS A 50 Bouguer gravity
Page 83 and 84:
GE·OLOGICAL SURVEY RESEARCH 1970 R
Page 85 and 86:
B80 GEOPHYSICS FIGURE 1.-Bouguell'
Page 87 and 88:
B82 GEOPHYSICS J I 37·~~------~~--
Page 89 and 90:
B84 GEOPHYSICS B 600 B' 500 400 (/)
Page 91 and 92:
GE,OLOGICAL SURVEY RESEA·RCH 1970
Page 93 and 94:
EXPLANATION Pikes Peak • batholit
Page 95 and 96:
DISTRIBUTION OF URANIUM IN URANIUM-
Page 97 and 98:
B92 GEOCHRONOLOGY Fleischer, R. L.,
Page 99 and 100:
B94 ECONOMIC GEOLOGY 103° 35' w 1/
Page 101 and 102:
'B96 ECONOMIC ·GEOLOGY 0 500 FEET
Page 103 and 104:
B98 ECONOMIC GEOLOGY TABLE !.-Summa
Page 105 and 106:
BlOO ECONOMIC GEOLOGY surface seems
Page 107 and 108:
GE 1 0LOGICAL SURVEY RESEA·RCH 197
Page 109 and 110:
B104 EJrucJh of the four samples wa
Page 111 and 112:
B106 ECONOMIC GEOLOGY R. 56 E. R. 5
Page 113 and 114:
B108 ECONOMIC GEOLOGY outcrop under
Page 115 and 116:
BllO Brady, of the Museum of Northe
Page 117 and 118:
Bll2 PALEONTOLOGY FIGURE 1.-ProtobZ
Page 119 and 120:
B114 PALEONTOLOGY c .,;# I I ' ' lO
Page 121 and 122:
B116 PALEONTOLOGY ments, the larges
Page 123 and 124:
GErOLOGICAL SURVEY RESEA·RCH 1970
Page 125 and 126:
B120 L xMH 'xE soo~~B_R~I __ T_I __
Page 127 and 128:
B122 PALEONTOLOGY Tetrataxis sp. Te
Page 129 and 130:
GE~OLOGICAL SURVEY RESEARCH 1970 TR
Page 131 and 132:
Bl26 PALEONTOLOGY TABLE 2.-Ranges o
Page 133 and 134:
B128 PALEONTOLOGY l
Page 135 and 136:
BI30 PALEONTOLOGY Ocmt/rrence.-P. m
Page 137 and 138:
Bl32 PALEONTOLOGY proximately 5.7 m
Page 139 and 140:
Bl34 PALEONTOLOGY a b c d e f g - D
Page 141 and 142: Bl36 PALEONTOLOGY --- 1963. The ori
Page 143 and 144: B138 PALEONTOLOGY core are m1ssmg,
Page 145 and 146: B140 PALEONTOLOGY death assemblage:
Page 147 and 148: Bl42 STRATIGRAPHY EXPLANATION l:.\.
Page 149 and 150: B144 STRATIGRAPHY ver. We do not in
Page 151 and 152: B146 STRATIGRAPHY age. A stratigrap
Page 153 and 154: B148 5 10 15 20 X X Plntygonus Pla.
Page 155 and 156: GE~OLOGICAL SURVEY RESEARCH 1970 CL
Page 157 and 158: B152 STRATIGRAPHY at a depth of 58
Page 159 and 160: ••••• 0 .... ••••
Page 161 and 162: B156 STRATIGRAPHY REFERENCES Brown,
Page 163 and 164: B158 STRATIGRAPHY In what follows,
Page 165 and 166: Bi60 STRATIGRAPHY TABLE !.-Stratigr
Page 167 and 168: B162 SEDIMENTATION with increasing
Page 169 and 170: llj ...... ~ TABLE 2.-Specific grav
Page 171 and 172: B166 TABLE 3.-Settling time for a 1
Page 173 and 174: Bl68 GEOMORPHOLOGY 74° 44° YERMON
Page 175 and 176: B170 GEOMORPHOLOGY have also been r
Page 177 and 178: B172 GEOMORPHOLOGY end of Long Isla
Page 179 and 180: GEOLOGICAL SURVEY RESEARCH 1970 DET
Page 181 and 182: ~ooo ______________ B176 ANALYTICAL
Page 183 and 184: B178 terranes where the search for
Page 185 and 186: B180 Reproducibility Replicate anal
Page 187 and 188: B182 ANALYTICAL METHODS in the aque
Page 189 and 190: GEOLOGICAL SURVEY RESEARCH 1970 CHE
Page 191: B186 ANALYTICAL METHODS 3.31 percen
Page 195 and 196: GEOLOGICAL SURVEY RESEA~RCH 1970 TR
Page 197 and 198: B192 GROUND-WATER RECHARGE I T I 14
Page 199 and 200: B194 GROUND-WATER RECHARGE Therefor
Page 201 and 202: GEOLOGICAL SURVEY RESEARCH 1970 PRE
Page 203 and 204: B198 GROUND-WATER RECHARGE the basi
Page 205 and 206: B200 GROUND-WATER RECHARGE t \ \)
Page 207 and 208: B202 GROUND-WATER RECHARGE Water is
Page 209 and 210: B204 GROUND-WATER CONTAMINATION rv
Page 211 and 212: B206 GROUND-WATER CONTAMINATION TAB
Page 213 and 214: B208. GROUND-WATER CONTAMINATION fa
Page 215 and 216: GEOLOGICAL SURVEY RESEARCH 1970 MEA
Page 217 and 218: B212 SURFACE WATER plotted, and the
Page 219 and 220: GEOLOGICAL SURVEY RESEA·RCH 1970 T
Page 221 and 222: B216 SURFACE WATER however, if the
Page 223 and 224: B218 SURFACE WATER TABLE 4.-Variati
Page 225 and 226: B220 RELATION· BETWEEN GROUND eral
Page 227 and 228: B222 -0.010 f -0.005 (i) RELATION B
Page 229 and 230: GEOLOGICAL SURVEY RESEARCH 1970 THE
Page 231 and 232: 'B226 RELATION BETWEEN GROUND WATER
Page 233 and 234: B228 RELATION, BETWEEN GROUND WATER
Page 235 and 236: B230 RELATION BETWEEN GROUND WATER
Page 237 and 238: GEOLOGICAL SURVEY RESEARCH 1970 HYD
Page 239 and 240: B234 EROSION AND SEDIMENTATION side
Page 241 and 242: B236 EROSION AND SEDIMENTATION s·o
Page 243 and 244:
B238 EROSION AND SEDIMENTATION Cont
Page 245 and 246:
B240 EROSION AND SEDIMENTATION 2 3
Page 247 and 248:
GEOLOGICAL SURVEY RESEARCH 1970 SPE
Page 249 and 250:
B244 GEOCHEMISTRY OF WATER REFERENC
Page 251 and 252:
B246 HYDROLOGIC TECHNIQUES The upla
Page 253 and 254:
B248 HYDROLOGIC TECHNIQUES type in
Page 255 and 256:
GEOLOGICAL SURVEY RESEARCH 1970 ,,.
Page 257 and 258:
B252 formula may also be useful in
Page 259 and 260:
GEO'LOGICAL SURVEY RESEARCH 1970 CO
Page 261 and 262:
B256 randomly fluctuating component
Page 263 and 264:
B258 HYDROLOGIC TECHNIQUES 1.0 ~ Qj
Page 265 and 266:
~ B260 HYDROLOGIC TECHNIQUES 1-3, f
Page 267 and 268:
I B262 HYDROLOGIC TECHNIQUES REFERE
Page 269 and 270:
,' B264 Page Gravitational sliding,
Page 271 and 272:
., / )
show all

RESEARCH· ·1970·

Create successful ePaper yourself

Delete template?

Save as template?