Transcription
UNITED STATES DEPARTMENT OF THE INTERIORGEOLOGICAL SURVEY.Analytical results and sample locality mapsof stream-sediment and soil samplesfrom the Tlo Flaco study area, El Correo quadrangle,northern Sonora, MexicoByRobert L. Turner, James G. Frisken,and Paul K. TheobaldOpen-File Report 84-635This report is preliminary and has not been reviewed for conformity withU.S. Geological Survey editorial standards and stratigraphic nomenclature.Any use of trade names is for descriptive purposes only and does not implyendorsement by the USGS.1984
CONTENTSPageStudies related to the Mexican coop program.1Introduction.1Methods of study.1Sample collection.1Stream-sediment samples.1Soil samples.3Sample analysis by the spectrographic method.3References cited.3ILLUSTRATIONFIGURE 1. Index map showing the location of the Tio Flacostudy area, El Correo quadrangle, northern Sonora, Mexico.2TABLESTABLE 1.Stream sediment samples:TABLE 2.Soil samples:spectrographic analysis.4spectrographic analysis. 31TABLE 3. Limits of determination for spectrographic analysisof stream sediments and soils. 87TABLE 4. Field identification of rock units associated with soilsamples in the Tio Flaco study area. 88PLATESPLATE 1. Stream sediment sample site location map for theTio Flaco study area, El Correo quadrangle,northern Sonora, Mexico.in pocketPLATE 2. Soil sample site location map for theTio Flaco study area, El Correo quadrangle,northern Sonora, Mexico.in pocket
STUDIES RELATED TO THE MEXICAN COOP PROGRAMThe analytical results presented in this report are part of a largercooperative program between the U.S. Geological Survey and the Consejo deRecursos Minerales of Mexico. The program, initiated in 1973, was designed toevaluate the use of a multidisciplinary (geology, geochemistry, andgeophysics) approach to mineral exploration in the Sonoran environment. Theproject was initially funded by the government of Mexico, the U.S. GeologicalSurvey, and the U.S. National Science Foundation.INTRODUCTIONIn the spring and fall of 1978 we conducted a detailed geochemical surveyof the Tio Flaco area, El Correo quadrangle, northern Sonora, Mexico.ooThe Tio Flaco study area comprises about 4 mi (10 knr) in the center ofthe El Correo quadrangle, northern Sonora, Mexico and lies about 25 mi (40 km)southwest of Nogales, Arizona (fig. 1). Access to the vicinity of the studyarea is provided on Mexican National Highway 15 south for 12 miles from theinternational border and then west-southwest for 13 miles on an unnamed gradedroad. Access to the Tio Flaco study area is provided by a trail beginning atthe settlement of La Cienega.Rocks outcropping within the study area represent the central region of alarge volcanic pile located in the central part of the El Correo quadrangle.The regional geologic units are latitic, probably of Mesozoic age, into whichrhyolitic units have been emplaced, some of which are intrusive and othersextrusive. Quartzite rests unconformably on the volcanic rocks. Regionallynorthwest-trending faults are cut by north-northeast-trending faults.Tertiary and younger gravels fill grabens formed by these faults and lap ontothe older rocks.The topographic relief in the study area is about 780 ft (240 m), with amaximum elevation of 4,460 ft (1,360 m). The ground surface is an upliftedregion deeply incised by intermittent streams. Interstream uplands arecovered by live oak, mesquite, and cacti. The climate is semiarid.METHODS OF STUDYSample CollectionWe collected stream sediment samples at 401 sites (plate 1) and soilsamples at 622 sites (plate 2). We analyzed 401 stream-sediment samples and622 soil samples, for a sampling density of about 1 sample per .01 mi for thestream sediment and about 1 sample per .006 mi for the soil.Stream-sediment samplesAnalyses of the stream-sediment samples represent the chemistry of therock material eroded from the drainage basin upstream from each sample site.Such information is useful in identifying those basins which containconcentrations of elements that may be related to mineral deposits.
a***?- / \Figure 1. Index map showing the location of the Tio Flaco study area,El Correo quadrangle, northern Sonora, Mexicos'
The stream-sediment samples consisted of active alluvium collectedprimarily from streams no longer than 200 m. Each sample was composited fromseveral localities within an area that may extend as much as 30 ft from thesite plotted on the map.Soil samplesThe use of soil samples enabled us to obtain a greater sampling densityin areas that were found to be anomalous in the elements of interest from thestream sediment sampling program. Soil was sampled on the ridges and wideinterstream areas of the central part of the Tio Flaco area. This area, fromthe analytical data of the stream sediment samples, appeared to be the centerof a large hydrothermal system extending over much of the El Correo area.The stream sediment and soil samples were sieved at the collection sitethrough a 30-mesh screen and the minus-30-mesh material was retained foranalysis. The stream-sediment and soil samples were later pulverized withceramic plates to minus 0.15 mm.Sample Analysis by the Spectrographic MethodWe analyzed the stream-sediment and soil samples for 31 elements using asemiquantitative, direct-current arc emission spectrographic method (Grimesand Marranzino, 1968) (tables 1 and 2). Spectrographic results were obtainedby visual comparison of spectra derived from the sample against spectraobtained from standards made from pure oxides and carbonates. Standardconcentrations are geometrically spaced over any given order of magnitude ofconcentration as follows: 100, 50, 20, 10, and so forth. Samples whoseconcentrations are estimated to fall between those values are assigned valuesof 70, 30, 15, and so forth. The precision of the analytical method isapproximately plus or minus one reporting unit at the 83 percent confidencelevel and plus or minus two reporting units at the 96 percent confidence level(Motooka and Grimes, 1976). Values determined for the major elements (iron,magnesium, calcium, and titanium) are given in weight percent; all others aregiven in parts per million (micrograms/gram) (table 3).Gold, cadmium, niobium, antimony, tungsten, and thorium were not presentin detectable quantities in either the stream-sediment or soil samples.Arsenic was not detected in any of the soil samples.REFERENCES CITEDGrimes, D. J., and Marranzino, A. P., 1968, Direct-current arc andalternating-current spark emission spectrographic field methods for thesemiquantitative analysis of geologic materials: U.S. Geological SurveyCircular 591, 6 p.Motooka, J. M., and Grimes, D. J., 1976, Analytical precision of one-sixthorder semiquantitative spectrographic analyses: U.S. Geological SurveyCircular 738, 25 p.
32,746482,863482,830482,970483,034483,027483,1 1 9483,069483,131483,1 1 8483,1 48483,142483,1 81483,188 .00483,21 0.54483,21 9 .30482,738 .00482,730 69432,783482,781482,369RLT1068RLT1069RLT1 070RLT1071RLT1 072RLT1073RLT1 07*.RLT1075RLT 1076RLT1077RLT1078RLT1079RLT1080RLT1081RLT 1082RLT1083RLT 98RLT 1099RLT1 100RLT1 101RLT1 102data.50.30.70.501 .00.30.30.50.30.301 .51.51 .01 .51 .51 .51 .51 .02.01.53,440,791 03,441 ,51 9.03,441 ,594.43,441 ,580.53,441 ,100.03,441,152.03,441 ,463.03,441,479.93,441,51 5.23,441,527.83,441 ,531 .03,441,288.63,441,323.73,441 ,297.33,441 ,425.03,441,356.43,440,955.03,441 ,095.13,441,092.63,441,246.13,441 ,246.31 .0.71 .01 .01 .52.01 .01 .51 .51 .51.51.51 .51,01.5.70.15.10.30.20.70.70.70.70.701 .00.70.501 .001 .00.50.50.701 .001 .00.30.50.30.70.501 .01 .01 .02.01.53,440,893.23,440,952.43,441,01 3.03,441,151 .13,441,066.7.5.0.5.0.5.20.50.30.30.501 .01 .01 .51 .01.03,440,988.73,440,981 .73,441,01 1.73,441,025.73,440,822.811111.501 .00.30.20.301 .51.51 .01 .01 .0Y-Ut m1 N.5.5.71 .0.71.01.0 .5.7.5.5 .5 .5 .5 .5 .5 .5 .5.7 .51,0001,0001,0001,5001,000.10.07.1 5.10.1 51 ,5001,0001 ,5001,5001,5001,000700700500700.1 5.10.10.07.1 5.1 0001,0002,0001,000.20.10.10.20.20.05.05 .05.15.10 .05 .05.05.05.071 ,0001,000700300700.20.15.1 5.10.1 5 .05.05 .05 .05 .05.71.0.5.51 .0.5.7 .51.0 .51,5001,5001,0001,5001,500.10.10.10.1 5.207007001,000700500 200N200203NN500100502,0007001,0001,0005007001 ,500 200NMM 0 .05.20 .05. 10MN 200.51.01.02.0 0.05.05 .05 .05.10MNNNNl .5 .5 .5 .7 .5 .5 .5sAs-ppmshown.].07.1 5.10.07.07SAg - ppmvalueof .05.05 .05 .05.077001,500500700700Mn-ppmsthestjdy.1 5.20.07.07.07ssthandetailed.05.20.05 .05 .05T i-pc t .C a-pc t .sediment samples collected during the U. S . G . S. - C . R . M .El Correo quadranyle, northern Sonora, Mexico,of determination shown,' , determined to be greater3,440,867.93,440,881 .43,440,865.03,440,865.93,440,917.3-JO mesh streamTio Flaco area*oelow the limiti*g-pct .sforthebutFe-pc t 61.00.1 84.05.1 3483,1 59433,326483,397483,384482,664RLT1 063RLT1 064RLT1065RLT1066RLT 1067.C9.30.04.91.42 r482,747482,841482,845432,927483,01 8detected/'RLT1058RLT1 059RLT1 060RLT 1061RLT 1062notAnalyticalX-U t mN,1.SampleCTaole
1 .01.51.51 .01 . 070030C30070C70 5RLT1076RLT1 RLT1099RLT1100RLT1101RLT1 1023.01 .01 .01 .51 .52.01 .51 . 51 .52.02.02.01 .52.03.03.01.51 .52.03.03.0.5.0.5.0.51 .52.01 .51 .51 .57C 1112.02.01 .51.51 . 5Ba-pp msSample1 0001 0NN5010N1 01 01 5101510101520103020.108 i -ppms 5 5 5 5 5 5 5 5 57 5 5 5 520 5 5 55 5 5 5 5 5 5 510520 5 57 55 57 51510103030305030505050505030305030707050 20 2050203030305030100701 50507050507070503070701000000000000000000 1000000000001 50000000000 5 5 5 5 5 55 5557 5 5* 55 5. 55575 55 57 5155103030N 5 5 55 5507501010 5 55 5 5 55 5 5 5 5 5 7015050503050503030305030151 520300000 10001010 10000000000000202000O 000005 515151020 551 515105 551015 5 5 55 51077 515 5 5 5 5 5 5 5 5707050303030302030301 5 10000000Ni i ppTs51 5 5 5 5ofCu-ppmsMo-ppmsstjdyC r-ppmsL a-ppmsdetailedCo-ppmsfor -yo mesh stream sediment samples collected during the U . S . G . S. - C . R .the T i o Flaco area* El Correo quadrangle* northern S o n o r a * Mexico.oe-ppmsTdOle 1. Analytical uata
1 CO225321 CO2005 CO2007 CO3001 ,5 CO2003 CO2003 CO70703 CO3 CO70701 CO20070RLT1078RLT1079RLT1080RLT 1 88RLT1089RLT 1090RLT1091RLT1092RLT 100RLT1101RLT1102COCOCOCOCO7 5 5 555 5 5 5575 555555 55 5771 0N10201 01030201015151 520201010101010102010151510150 1 00 0100151501501 50 1 00100200500700 200 20050507010070NNNNN 200N200300500700300200N1520301550300300N300200 200300200 200500700700200 200NN 0705070305050505050Y-p pmsdetailed20203015151515201 5301515153020101 510101 5157010101020152020SV-ppr3001 50100150150150150150200200100100 1000 00100150 1001 50100150 5 10301001001001001 50201 5150150150 100100 555551 51 0S r-pp ms3 CO5 GO3 CO3CC70RLT1063RLT1069RLT107GRLT1071RLT107257 55 5sS n- ppm100150000 1001 50507070702 CORLT1063RLT1064RLT1065RLT1066RLT1067sS c-for -3 mesn stream sediment samples collected during the U.S.G.S.-C.R.Mthe Tio Flaco area* 1 Correo quadrangle/ northern Sonora* Mexico. 55 55 57070705070sPb- p pmAnalytical dataRLT1053RLT105*RLT1060RL T1061RLT1062SampleTable ppmsof
1 331341 351 361 1483,575483,61 1483,589RLT1RLT 1RLT1RLT1RLT11431 441451 461 47483,296.59483,304 .1 7483,340 .64433,390 .90483,383 .39RLT1 138RLT1 1 39RLT1 1 40RLT 1 1 41RLT11 982484,1 00484,1 501 281 291301311 32RLT1RLT1RLT1RLT1RLT1483,215482,553482,625482,61 6483,9321231 241 251 261 27.27.55.43.60.75483,51 6483,61 5483,707483, &88483,71 3RLT1RLT1RL T1RLT1RLT11 1 31 141 1 511 61 17.RLT1RLT1RLT1RLT1RI.T1.66.25.DC.00.81483,1 45483,241483,31 9482,650483,425483,766.53483,750 .22483,775.51483,760 .44483,768 .111081091 101 111 12RLT1RLT1RLT1RLT1RLT1482,860 .85482,956.00483,01 9.16482,996.34483,135 .68X-Ut mAnalyticalRLT1 1 18RLT1 119RLT1 1 20RLT 1 1 21RLT11 221 031 041051 06107RLT1RLT1RLT1RLT1RLT1SampleTable 1.30.30.70.70.2011111111111 .51.01 .01 .51 .01 .01 .01 .01 .51.0111111.01 .51 .51 .51 .53,440,539.13,440, 581 0,749.03,440,842.33,440,844.93,440,91 9.33,440,906.83,440,929.23,440,931 0,955.13,440,933.13,441 ,037.33,440,453.23,440,881 .33,440,944 .03,440,988.03,440,993.43,441 ,952.63,441 3,442,089.53,442,065 .13,442,008.23,442,01 3.3.70.20.30.50.701.51 .01 .01 .51 0, 51 6.71 .51 .01 .52.01 .5.0.0.5.0.5.0.0.5.0.0.5.5.0.0.0.30.30.30.20.301 .0.71 .01 .01 .03,440,588.43,440,588.03,440,637.03,440,51 8.43,440,486.31 .00.70.50.70.70.70.70.70.70.70.20.50.70.501 - p c t .sct.Y-UtmNMNl\iMNNNNNNMN\NN .5 . 5 . 5 . 5 .5 .5 .5 . 5 . 5 .5 .5 . 5 . 5 .5 .5 .5 . 5 . 5 . 5 005001 ,5001,000700.10.07.10.10.1 5.10.1 5.1 5.07.10.10.10.1 5.1 5.10.20.20.1 5.20.1 5.10.10.1 5.1 5.071,0002,0001,500700500.20.10.15.15.10.05 .05.05 .05 .051,5001 ,0001 MNNNN.71.0.5.71.01.51 .0.5 .5 .5,MNNNM .51 .0.5 . 51 .57002,0001 ,0001,0002,000M.10.1 5.20.10.15MVMNN .5 . 5 . 5.51,0007007002,0001,000NNNNJNN\l\lN .5 . 5.5 .5 .5A s-ppmsAg- ppTisstudy5005001 ,0005001 ,500Mn- ppmsdetailed.07.07.07.07.10T i-pc t .s.05.10.15.10.20.05.07. 10.07.30.20.05.05.07.20.05.07.05.07 .05.05 .05.05 .05.10.05 .05.05.05.05.05.07.05 .05.05C a-pc t .sdata for -?0 mesn strean- sediment samples collected during the U. S . G.S. -C.R.M.the Tio Flaco area* El Correo quadranole, nortnern S o n o r a , Mexico.--continuedof1 ,5001 ,0003001501 003003003001 ,5001 ,0001,5001 ,0001 ,0033-ppms
1.01 .51 .51 .01 .5111117CC50C70C50070070C70 C70 C5GC50C70070070C70050C1 OOC1 /OO G7001,OGC1,00 C70C70C70C70 C70C7GG1/OOC1,OOC70C1 1109RLT1 1 10RLT1 11 1RLT1112RLT11 13RLT1 1 14RLT1 11 5RLT1116RLT1 117RLT1 118RLT1 1 19RLT1 120RLT1 121RLT1122RLT1123RLT1 124RLT1125RLT1126RLT1127RLT1128RLT1129RLT1130RLT1 131RLT1132RLT1133RLT1134RLT1135RLT1 136RLT1137RLT1138RLT1139RLT1140RLT1141RLT1142RLT1 143RLT1144RLT1145RLT1146RLT1147.0.5.5.5.02.01 .51 . 51 .01 .52.01 .52.01 .51 .51 . 51 . 51 . 51 .52.0111111 . 51 .01 . 51 .51.5.0.0.5.5.01 010 500200000051010 5 557 510775151 5 55571 571 5 5 5 5 5 51 0 510000000O 010ooooO 0ooNN 10000000O 000N0000 1 00000001 51C 5 50000 00O 00000000000201 555oooooooo7 5 5 52.01 . 51 .01.5onoooo0010C r-ppms1 .5C o-ppms2.010Bi -ppm 5 5 5 553.01 076e-ppmsBa-pp 2020303030505030205020303030303030151 5La-ppmsC u-pomsAnalytical data for -J*0 mesh stream sediment samples collected during the U . S . G . S. - C . R . "Ithe Tio Flaco area/ El Correo quadrangle/ northern Sonora/ Mexico.--continuedSampleTable 1study ofS57 5 55 55 5 5 5 5 5 5 5 5 5NN 5 5 5 5 55 5 5 5 5 5 5N 5 5 5N75 5 5 5 5 5 5 5 5M0 ppmdetailedS7 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 520 5715 5 5 5 5 5 5 530 530 5 5 5 550 5 5 5 5 5 5 5 55Ni ppm
507070701 007070701 CO5070COGO50502211233375 CO3 CO1 50701 50RLT1123RLT1124RLT1125RLT1126RLT1 127RLT1 128RLT112?RLT1130RLT1 38RLT1139RLT1140RLT1141RLT1142RL T1143RLT1144RLT1145RLT1146RLT1 147COCOCOCOCO7050707050RLT1 1 18RLT1 1 19RLT1120RLT1 121RLT1122 & 75555 5 5 5 555 57 5755 57555515201 51510151 520701 501 507070131415161 7RLT11RLT11RLT1 1RL T1 1RLT1100100000150000 100 5 57 5 51 CO70 5 575 5150 1001 50 100 100 5 5 55 51502003005001 501001501 301007050705030505070305050101 5151570501503050507070305C503070Y- p 01501 501500002001001501 502000000001001500001 50000mo100100100 100S r-ppms1 CO3070S n - pp msRLT1108RLT1109RLT1 1 10RLT11 11RLT111 2SS C-pp mdata for -JO mesh stream sediment samples collected during the U.S.G.S.-C.R.M,the Tio Flaco a r e a/ El Correo quadrangle/ northern Sonora/ Mexico.--continued 5 5 5 5 5SPb-p pmAnalytical7050501 le500500N 200500700200300500500200200 200 200300 200200 200N200 200 200 200200500NN200NNNN 200200N 200200 200NNN 200NNNZ 0707010070702 r-pp*sdetailed study of
483/909483/91 483/11 8RLT1 183RLT1 1 84RLT 11 85RLT1 1 60RLT1 1 87RLT1RLT1RLT1RLT1RLT11 881 891 901 91192483/679483/671483/661483,580483/8471 781 791 801811 82RLT1RLT1RLT1RLT .82.67.07.62.571 731 741 751 76177RLT1RLT1RLT1RLT1RLT1483,51 2483/605483/685483/675433/690483/862 .69483/347 .61483/827 .38433/824.05483/840 .261 601 691 701 /689483/687483/721483/759483/744 .77483/797 .50483/753.41483/841 .44483/863 .9958596061o2RLT11RL T1 1RLT1 1RLT1 1RLT1 1.36.43.68. 8.64.44.08.71.07.61483/439483/41 483/484X-UtmRLT1 163RLT1 1 64RLT11 65RLT 1 1 66RL T1 1675354555o5711111RL T1RLT1RLT1RLT1RLT1484950515211111RLT1RL T1RLT1RL T1RLT 1Sample3,442,191 .33,442,366.73,442,530.23,442,647.33,442,590.95.0? .01 .51 .51 .51 .001 .00.70.70.50.70.30.70.70.701 .01 .53.07.03.03,442,01 5.83,442,056.23,442,1 1 1 .73/442/265.63,442,200.2.70.70.70.70.701 .52.01.51 .53.03,441 ,787.03,441,658.33,441 ,660.83,441 ,579.13,441,959.31 ,0001 ,5007001,000300NNNNN5.07.0.51 .07.03,0007007001,500700.30.20.1 5.10.1 5.05 .05.05.05.051502005002,0001 ,500fjNN\N .5 . 5 .53.02.07007001,0002,0001,000.10.10.20.20.1 5foNNMN .5.5 . 5 . 5 .57001 ,0007001,000700.1 5.1 5.20.10.30.07.05.07.05.07.05.05.05.07.05NNNNV .53.0 . 5.07.07.70.501 .00.70.701 .52.01 .51.51 .53,442,088.13,441 ,891 .83,441 ,841 .33,441,840.03,441,779.4NNNNN .5. 71.0 . 5 .5700700300300300.10.20.30.20.1 5 .05.05.07.07.051 .CO.701 .00.70.701 .51 .52.01 .01 .03,441,81 9.13,441 ,81 5.33,441 ,740.93,441 ,978.33,441, 91 6.4NNNNN .5 . 5 . 5 . 5 .57007001/000700500.07.07.07.1 5.1 5 .05 .05 .05 .05 .051 .00.50.70.70.701 .51 .02.01 .55.03,441 ,886.53,441 ,879.93,441,803.13,441 ,874.73,441 01502005003002003003003002002001 ,000700700150200NNNNN1,5001 ,000700700700Nl\l .5 . 5 . 5 . 5 .5.07.1 5.10.1 5.20 .05.10 .05 .05 .05.701 .00.70.70.701 .52.02.02.010.03,441 ,947.43,441,964.93,441 ,946.03,441 ,934.53,441 5 on500 .5 . 5 . 5 . 5 .5.1 0.07.07.20.07 .05 .05 .05.05 .051 .001 .00.70.70.30 sssH3-ppmAs-ppnAg-pp-nNMn-ppms .5 . 5 . 5 . 5 .5.07.1 0.10.07.1 0 .05 .05 .05 .05 .05. 701 .00.501 .00.70T i - pc t .sC a-pc t .s( g-pc t .s2.01 .31 .52.1)1 .51 .51 .51 .51 .52.0F e-pc t .s3,441,745.03,441 ,703.53/441 ,690.83,442,041 .13,441 ,980.33/441 ,942.83,441 ,847 .03,441,824.43,441 ,780.33,441 ,770.1Y-ut mTacle 1. Analytical data for -30 mesh streaT sediment samples collected during the U.S.G.S.-C.R.M. detailed study ofthe Tio Flaco area/ El Correo quadrangle/ northern Sonora/ Mexico . --continued
70070070C70C70 68RLT1169RLT1170RLT1171RLT1172RLT1173RLT1174RLT1 175RLT1176RLT1 1 4RLT1185RLT1186RLT1187RLT1 1 88RLT1 189RLT1190RLT1 1 91RLT1192.0.0.0.0.0.0.0.0.0.0.0.5.0.0.0.0. 5.0.0.02.02.01 .51 .53.01 .51 .51 .52.01.52.01 .51 . 51 .52.01.52.02.02.01 .51 .01 .53.02.01 .51 1 1 1 11111170C70C70C70C700RLT1 148RLT1149RLT115URLT11 51RLT1152Be-ppms 5 55 5 5 5 5 5 5105 510105770 572050305020303070202050200 5 5 5 5 5 5 5 5 51550703050205070303010157105 500000000001 0001000001010000010151 510751 5757700000070702050O 00000201 520001010157201000001010 5 5 5 5 51001 505015010010101 510107107751 50 5 5 5 5 5 577 5 51501 1505070507070305070505000101 51010 5 5 5 5 5 5 510 5 5302050203010157150500000000000 5 5 5 5 5 5 5 5 5520502050301007715710 5 5 5 5 5 5 5 577 5 5 5 5 5 5 5 5 5 5Mi-ppms50505030303050503050'1 001000sC u-ppmdetail ed001000001572075715515 1 0101CN00NNNN1510001073010oo71010 101000101 5C r-p pmsCo-ppms3 i -ppmsdata for -JO mesh stream sediment samples collected during the U.S.G.S.-C.R.M,the Tio Flaco area/ El Correo quadrangle/ northern Sonora/ Mexico.'-continuedBa-p p msAnalyticalSampleTaole 1
7050507C501 CO505C1 CO503070703050RLT1 153RLT1159RLT 1 673 CO50C1 CO2001 CCRLT1188RLT1189RLT1190RLT1191RLT11925C3C503 CO3 CO3055 5 55 5 5 57 5 55 5 553070301 50 55775 s7 f f f70COCOCO00RLT1183RLT1 81RLT11822131 575 5703070301 5CRLT1153RLT1154RLT1155RLT1 156RLT1 157RLT1173RLT1174RLT1 1 75RLT1176RLT1177 1 503050 S1 CO70S c-ppms30703U20:10:1 0:101010:10:10N2010S n-ppms20200150150150100200150100150 100100 01001 03020201510151515101502001020100151015152003001 503001 50 1002001 51 51515 10103003001 70702030505050Y-p pmdata for -JO mesh stream sediment samples collected during the U . S . G . S . - C . R . Mthe Tio Flaco area/ El Ccrreo quadrangle/ northern Sonora/ Me x i co . -- c ont i nuedRLT1 148RLT1149RLT1150RLT1 151RLT1 152AnalyticalPb-p pms1.SampleTaole700500200200 200500200NNNN 200 200 200700 200300200 200NN 200N 200 200 200 200N 200 200N 200N 200300NNN200 200500 200200Z n-ppmsdetailed 1501003001001005015070305315070150Z r-ppmsof
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5 5 5 5 57 5 5 555070501 CO1 CO1 CO5070301 50702 CO3070305030705030501 5C1 CO3070305050303050705070501 50301 CO5070RLT1 198RLT1199RLT1200RLT1201RLT1 202RLT1203RLT1204RLT1205RLT1206RLT1207RLT1205RLT1 209RLT1 210RLT1 21 1RLT1 212RLT1213RLT1 214RLT1 21 RLT1241RLT1242RLT1243RLT1244RLT1245RLT1 246RLT1 54RLT1255 57 57500000000ooO 03000O 000 5 55 555 500O 0O 000OO0000O 000O 000ooO 00000ooO 0100000N0000O 0005555 5 557 5577 555 5N 5 500O 000OO555S n-ppm150100150O 001001001001001000001 501 NO 001501503001000001001501 001501001 303020302020V-p p.707070507070205030505070705050NN20020020NNNNNNN 200N700NNNNNN1 ,500 200NNN300 200 200 200Z n-ppmsdet a 00100705010010050Y-ppmSmesh stream sediment samples collected during the U.S.G.S.-C.R.M,area/ El Correo quadrangle/ northern Sonora/ M exico.--continued00 1 0000010 5 51 501 001 CO1 CO200S c-ppmsdata for -30the Tio Pb- p 150150Z r-ppmsof
484,698484,765434,7614a4,8014»4,40 3484,387484,383434,361484,328484,31 4434,249484,2254a4,185484,141 »84,1 9748
of stream-sediment and soil samples from the Tlo Flaco study area, El Correo quadrangle, northern Sonora, Mexico By Robert L. Turner, James G. Frisken, and Paul K. Theobald Open-File Report 84-635 This report is
