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GMC Data Report No. 220
Apatite fission track data derived from core from the following Barrow Arch wells: Husky Oil NPR Operations (U.S.G.S.) Tulageak T. W. No.1 (2,940' - 2,945'); Husky OilNPR Operations (U.S.G.S.) J. W. Dalton T. W. No.1 (4,680' - 4,686'); Husky Oil NPR Operations (U.S.G.S.) East Simpson T. W. No.2 (2,401' - 2,421'; , 6 047' - 6 066" and 6 705' - 6 713')' and , " , " U. S. Navy Fish Creek T. W. No.1 (6,005' - 6,011'). r:~ GE~OZQ I~~ ~ ~( <Ã> 0 ~¡ALS Received 21 January 1994 Total of 9 pages in report Alaska Geologic Materials Center Data Report No. 220 John M. Murphy 814 Arbor Ave.; Unit H Ft. Collin, CO 80526 303-282-9570 December 29, 1993 Dr . John Reeder Curator, Geological Materials Center Alaska State Division of Geological and Geophysical Surveys P.O. Box 772116 Eagle River, AK 99577 Hi John, The following table shows the apatite yields and data from samples yielding apatite (enclosed) from some wells on the Barrow Arch. Data from the in~situ vitrinite reflectance samples noted in my letter of 31 August 1993 will be forwarded separately by ARCO, by either S. Bergman or J. Decker. The residues of the processed samples have already been forwarded to you. ¡\FTA (n=13) Apatite? AFT Data Depth (ft.) Well Name 93BAl NO NO 2318-2330 South Barrow No. 13 93BA2 NO NO 2322~2345 South Barrow No. 17 93BA3 NO NO 2233-2242 South Barrow No. 19 93BA4 NO NO 2416-2422 Iko Bay No. 1 93BAS YES YES 2940-2945 Tulageak No. 1 93BA6 NO NO 3788-3797 " 93BA 7 YES YES 4680-4686 J.W. Dalton No.1 93BA8 NO NO 7981-7990 93BA9 YES YES 2401-2410 East Simpson No.2 93BAI0 YES YES 6057 -6066 II 93BAll YES YES 6705-6713 " 93BA12 NO NO 7185-7191.5 " 93BA13 YES YES 6005-6011 Fish Creek No. 1 Individual grain-age data sheets follow, with the confmed track length data table compiled separately. Should you need to contact me I will be away in Bolivia from 8 January through mid-February so will not be available then. Sincerely; J;M7Jt---------- Consultant GMC Data Report No. 220 1 2/l-D 93BA.Lengths A B C D E F G 1 Table of Track Lengths 2 3 Sample Number -> 93 BA5 93BA7 93BA9 93BA 10 93BA11 93BA13 4 Track Length Class 5 0-1 0 0 0 0 0 0 6 1-2 0 0 0 0 0 0 7 2-3 0 0 0 0 1 0 8 3~4 0 1 1 1 3 0 9 4-5 3 2 1 0 2 1 10 5-6 0 1 0 2 1 2 1 1 6-7 3 3 0 1 1 1 1 2 7-8 3 0 0 3 1 4 1 3 8-9 2 2 0 7 8 7 14 9,.10 6 14 0 1 8 7 1 1 15 1 O~ 11 1 5 13 4 24 6 22 1 6 11-12 1 8 20 5 1 7 8 1 9 17 12-13 24 1 7 20 1 5 1 4 9 1 8 13-14 1 0 9 23 1 2 7 9 1 9 14-15 6 4 21 0 3 8 20 15-16 1 2 1 4 2 0 1 21 16-17 0 0 5 0 0 0 22 17-18 0 0 0 0 0 0 23 18-19 0 0 0 0 0 0 24 19-20 0 0 0 0 0 0 25 Total Tracks 91 88 94 102 62 94 26 Mean Length 11.45 11.04 12.52 10.8 10.34 10.94 27 Error (2-Sigma) 0.26 0.25 0.2 0.2 0.38 0.22 28 Standard Deviation 2.49 2.33 1.96 2.02 3 2.17 29 30 31 GMC Data Report No. 220 Page 1 2/9 3/9 GMC Data Report No. 220 Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 Pooled Age = 125.5 ± 13.3 Ma Mean Age = 151.3 ± 35.3 Ma Central Age = 133.6 ± 21.7Ma % Variation = 44.08% CHI SQUARED = 22.03253 WITH 9 DEGREES OF FREEDOM P(chi squared) = 0.0 % CORRELATION COEFFICIENT = 0.886 VARIANCE OF SQR(Ns) = 5.912797 VARIANCE OF SQR(Ni) = 14.76578 Ns/Ni = 0.448 ± 0.028 MEAN RATIO = 0.541 ± 0.118 No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T .AGE(Ma) 1 68 182 100 0.374 18.4 1.038E+06 2.778E+06 104.8 ± 17.4 2 70 107 36 0.654 30.1 2.968E+06 4.537E+06 182.5 ± 32.0 3 20 84 100 0.238 8.5 3.053E+05 1.282E+06 67.0 ± 17.6 4 25 75 60 0.333 12.7 6.36OE+05 1.908E+06 93.6 ± 23.0 5 5 12 200 0.417 0.6 3.816E+04 9. 159E+04 116.8 ± 63.0 6 28 71 100 0.394 7.2 4.274E+05 1.084E+06 110.6 ± 26.4 7 12 1.7 100 0.706 1.7 1.832E+05 2.595E+05 196.7 ± 76.0 8 38 25 100 1.520 2.5 5.801E+05 3.816E+05 416.3 ±112.9 9 87 210 70 0.414 30.4 1.897E+06 4.579E+06 116.2 ± 17.8 10 9 25 100 0.360 2.5 1.374E+05 3.816E+05 101.1 ± 40.2 362 808 8.5 5.720E+05 1.277E+06 Area of basic unit = 6.551E-07 cm-2 COUNTED BY: JMM IRRADIATION LU197-01 93BAS Apatite Tulageak Core 1 (2940-2945') 4/9 GMC Data Report No. 220 Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 CHI SQUARED = 8.861479 WITH 8 DEGREES OF FREEDOM P(chi squared) = 1.6 % ' CORRELATION COEFFICIENT = 0.931 V ARIANCE OF SQR(Ns) = 6.600624 VARIANCE OF SQR(Ni) = 15.17458 Ns/Ni = 0.414 ± 0.027 MEAN RATIO = 0.432 ± 0.050 Pooled Age = 116.0 ± 12.5 Ma ~ean Af!e = 121.2 + 17.4 Ma Central Age = 115.2 ± 12.4Ma % Variation = 21.35% IRRADIATION WY -83184-93 COUNTED BY: JMM No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T.AGE(Ma) 1 68 182 100 0.374 18.4 1.038E+06 2.778E+06 104.8 ± 17.4 2 70 107 36 0.654 30.1 2.968E+06 4.537E+06 182.5 ± 32.0 3 20 84 100 0.238 8.5 3.053E+05 1.282E+06 67.0 ± 17.6 4 25 75 60 0.333 12.7 6.360E+05 1.908E+06 93.6 ± 23.0 5 5 12 200 0.417 0.6 3.816E+04 9.159E+04 116.8 ± 63.0 6 28 71 100 0.394 7.2 4.274E+05 1.084E+06 110.6 ± 26.4 7 12 17 100 0.706 1.7 1.832E+05 2.595E+05 196.7 ± 76.0 8 87 210 70 0.414 30.4 1.897E+06 4.579E+06 116.2 ± 17.8 9 9 25 100 0.360 2.5 1.374E+05 3.816E+05 101.1 ± 40.2 324 783 9.2 5.711E+05 1.380E+06 Area of basic unit = 6.551E-07 cm-2 93BA05 Apatite WITHOUT 416 Ma GRAI~ Tulageak Core 1 (2940-2945') 5/9 GMC Data Report No. 220 93BA 7 Apatite JW Dalton Core 2 (4680-4686') IRRADIATION WY-85186-93 COUNTED BY: JMM No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T.AGE(Ma) 1 12 41 60 0.293 1.1 4.844E+04 1.655E+05 82.3 ± 27.1 2 3 7 42 0.429 0.3 1.730E+04 4.036E+04 120.1 ± 82.9 3 35 144 28 0.243 8.3 3.027E+05 1.246E+06 68.4 ± 13.0 4 68 368 49 0.185 12.1 3.361E+05 1.819E+06 52.1 ± 7.0 5 2 12 30 0.167 0.6 1.615E+04 9.688E+04 47.0 ± 35.9 6 7 29 40 0.241 1.2 4.238E+04 1.756E+05 67.9 ± 28.7 7 62 144 42 0.431 5.5 3.575E+05 8.304E+05 120.7 ± 18.6 8 6 37 36 0.162 1.7 4.036E+04 2.489E+05 45.7 ± 20.2 9 52 95 25 0.547 6.1 5.038E+05 9.203E+05 153.0 ± 26.7 10 9 34 36 0.265 1.5 6.055E+04 2.287E+05 74.5 ± 28.0 11 16 56 45 0.286 2.0 8.611E+04 3.014E+05 80.3 ± 22.9 12 34 79 50 0.430 2.5 1.64 7E+05 3.827E+05 120.6 ± 24.9 13 6 25 50 0.240 0.8 2.906E+04 1.211E+05 67.5 ± 30.7 14 1 13 60 0.077 0.3 4.036E+03 5.247E+04 21.7 ± 22.6 15 4 24 50 0.167 0.8 1.938E+04 1.162E+05 47.0 ± 25.4 16 42 210 50 0.200 6.7 2.034E+05 1.017E+06 56.3 ± 9.6 17 9 65 48 0.138 2.2 4.541E+04 3.280E+05 39.1 ± 13.9 18 10 34 . 24 0.294 2.3 1.009E+05 3.431E+05 82.7 ± 29.8 19 13 27 24 0.481 1.8 1.312E+05 2.725E+05 134.8 ± 45.6 20 9 48 49 0.188 1.6 4.448E+04 2.372E+05 52.8 ± 19.2 21 31 117 50 0.265 3.8 1.502E+05 5.667E+05 74.5 ± 15.2 22 1 9 15 0.111 1.0 1.615E+04 1.453E+05 31.4 ± 33.1 23 2 5 36 0.400 0.2 1.345E+04 3.364E+04 112.2 ± 93.9 24 6 52 24 0.115 3.5 6.055E+04 5.247E+05 32.6 ± 14.1 25 1 5 36 0.200 0.2 6.727E+03 3.364E+04 56.3 ± 61.7 26 17 51 25 0.333 3.3 1.64 7E+05 4.941E+05 93.6 ± 26.3 27 11 89 60 0.124 2.4 4.440E+04 3.592E+05 34.9 ± 11.2 28 2 19 16 0.105 1.9 3.027E+04 2.876E+05 29.7 ± 22.1 29 12 47 20 0.255 3.8 1.453E+05 5.691E+05 71.8 ± 23.3 30 2 10 12 0.200 1.3 4.036E+04 2.018E+05 56.3 ± 43.7 31 9 56 36 0.161 2.5 6.055E+04 3.767E+05 45.3 ± 16.3 494 1952 2.7 1.024E+05 4.048E+05 Area of basic unit = 4.129E-06 cm-2 CHI SQUARED = 37.05626 WITH 30 DEGREES OF FREEDOM P(chi squared) = 0.0 % CORRELATION COEmCIENT = 0.866 VARIANCE OF SQR(Ns) = 4.237297 V ARIANCE OF SQR(Ni) = 14.4042 Ns/Ni = 0.253 ± 0.013 MEAN RATIO = 0.249 ± 0.022 Pooled Age = 71.2 ± 4.0 Ma Me~n Age = 70.? + 6.3 Ma Central Age = 70.2 ± 6.4Ma % Variation = 34.11 % Ages calculated using a zeta of 12250 ± 100 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 6/9 GMC Data Report No. 220 93BA9 Apatite E. Sipmson #2 Core 1 (2401-2410') IRRADIATION 93BA9.AGE COUNTED BY: JMM No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T.AGE(Ma) 1 21 78 20 0.269 39.5 1.603E+06 5.953E+06 75.7 ± 18.7 2 7 49 28 0.143 17.7 3.816E+05 2~671E+06 40.3 ± 16.3 3 3 13 28 0.231 4.7 1.636E+05 7.087E+05 65.0 ± 41.6 4 1 6 30 0.167 2.0 5.088E+04 3.053E+05 47.0 ± 50.8 5 11 42 16 0.262 26.6 1.049E+06 4.007E+06 73.7 ± 25.0 6 3 31 20 0.097 15.7 2.290E+05 2.366E+06 27.3 ± 16.5 7 8 72 24 0.111 30.4 5.088E+05 4.579E+06 31.4 ± 11.7 8 24 71 25 0.338 28.8 1.465E+06 4.335E+06 94.9 ± 22.5 9 14 51 16 0.274 32.3 1.336E+06 4.866E+06 77.2 ± 23.4 10 6 21 28 0.286 7.6 3.271E+05 1. 145E+06 80.3 ± 37.2 11 19 198 54 0.096 37.1 5.371E+05 5.597E+06 27.1 ± 6.5 12 6 25 6 0.240 42.2 1.526E+06 6.360E+06 67.5 ± 30.7 13 4 12 21 0.333 5.8 2.908E+05 8.723E+05 93.6 ± 54.1 14 36 125 28 0.288 45.2 1.963E+06 6.815E+06 81.0 ± 15.4 15 39 152 25 0.257 61.6 2.381 E+06 9.281E+06 72.2 ± 13.1 16 3 13 25 0.231 5.3 1.832E+05 7.938E+05 65.0 ± 41.6 17 25 155 100 0.161 15.7 3.816E+05 2.366E+06 45.5 ± 9.9 18 6 26 18 0.231 14.6 5.088E+05 2.205E+06 65.0 ± 29.5 19 32 158 16 0.203 100.0 3.053E+06 1.507E+07 57.0 ± 11.1 20 7 43 24 0.163 18.1 4.452E+05 2.735E+06 45.9 ± 18.7 21 32 73 35 0.438 21.1 1.396E+06 3. 184E+06 122.8 ± 26.2 22 14 118 30 0.119 39.8 7.124E+05 6.004E+06 33.5 ± 9.5 23 17 50 40 0.340 12.7 6.488E+05 1.908E+06 95.5 ± 26.9 24 4 10 28 0.400 3.6 2.181E+05 5.452E+05 112.2 ± 66.4 25 19 47 21 0.404 22.7 1.381E+06 3.416E+06 113.4 ± 30.9 26 16 36 30 0.444 12.2 8.l41E+05 1.832E+06 124.5 ± 37.5 27 8 16 36 0.500 4.5 3.392E+05 6.784E+05 139.9 ± 60.7 28 17 38 60 0.447 6.4 4.325E+05 9.668E+05 125.3 ± 36.7 29 5 10 12 0.500 8.4 6.360E+05 1.272E+06 139.9 ± 76.7 30 2 20 32 0.100 6.3 9.541E+04 9.541E+05 28.2 ± 20.9 31 5 12 16 0.417 7.6 4.770E+05 1. 145E+06 116.8 ± 62.2 32 4 23 24 0.174 9.7 2.544E+05 1,463E+06 49.0 ± 26.6 418 1794 19.8 6.966E+05 2.990E+06 Area of basic unit = 6.551E-Q7 cm-2 CHI SQUARED = 36.18573 WITH 31 DEGREES OF FREEDOM P(chi squared) = 0.0 % CORRELATION COEFFICIENT = 0.781 VARIANCE OF SQR(Ns) = 2.117999 V ARIANCE OF SQR(Ni) = 10.20448 Ns/Ni = 0.233 ± 0.013 :MEAN RATIO = 0.271 ± 0.022 Pooled Age = 65.6 ± 3.9 Ma Mean Age = 76.1 + 6.4 Ma Central Age = 70.1 ± 6.3Ma % Variation = 33.44% Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 7/9 GMC Data Report No. 220 93BAIO Apatite E. Simpson #2 Core 2 (6047·6066') IRRADIA 110N WY-89-93 COUNTED BY: JMM No. Ns Ni Na RA 110 U(ppm) RHOs· RHOi F.T.AGE(Ma) 1 11 104 100 0.106 10.5 1.679E+05 1.588E+06 29.9 ± 9.8 2 2 8 80 0.250 1.0 3.816E+04 1.526E+05 70.3 ± 55.9 3 4 43 60 0.093 7.3 1.0 18E+05 1.094E+06 26.3 ± 13.9 4 8 57 50 0.140 11.5 2.442E+05 1.740E+06 39.6 ± 15.3 5 7 77 90 0.091 8.7 1.187E+05 1.306E+06 25.7 ± 10.4 6 12 162 36 0.074 45.6 5.088E+05 6.869E+06 20.9 ± 6.5 7 48 448 90 0.1 07 50.4 8.141E+05 7.598E+06 30.2 ± 5.3 8 7 128 60 0.055 21.6 1.781E+05 3.256E+06 15.5 ± 6.1 9 1 14 60 0.071 2.4 2.544E+04 3.562E+05 20.2 ± 21.0 10 1 2 49 0.500 0.4 3.115E+04 6.231 E+04 139.9 ±171.8 11 4 46 24 0.087 19.4 2.544E+05 2.926E+06 24.6 ± 13.0 12 4 61 30 0.066 20.6 2.035E+05 3.104E+06 18.5 ± 9.7 13 3 40 30 0.075 13.5 1.526E+05 2.035E+06 21.2 ± 12.8 14 6 60 40 0.100 15.2 2.290E+05 2.290E+06 28.2 ± 12.3 15 8 34 48 0.235 7.2 2.544E+05 1.081E+06 66.2 ± 26.6 16 2 72 64 0.028 11.4 4.770E+04 1. 717E+06 7.9 ± 5.7 17 2 16 28 0.125 5.8 1.090E+05 8.723E+05 35.3 ± 26.6 18 5 58 49 0.086 12.0 1.558E+05 1.807E+06 24.3 ± 11.5 19 4 50 50 0.080 10.1 1.221E+05 1.526E+06 22.6 ± 11.9 20 63 457 90 0.138 51.4 1.069E+06 7.751E+06 38.9 ± 6.2 21 3 43 35 0.070 12.4 1.308E+05 1.875E+06 19.7 ± 11.9 22 7 45 50 0.156 9~1 2.137E+05 1.374E+06 43.9 ± 18.2 23 25 368 90 0.068 41.4 4.240E+05 6.242E+06 19.2 ± 4.3 24 2 41 50 0.049 8.3 6.106E+04 1.252E+06 13.8 ± 10.0 25 5 136 64 0.037 21.5 1.l93E+05 3.244E+06 10.4 ± 4.8 26 6 50 80 0.120 6.3 1. 145E+05 9.541E+05 33.9 ± 14.9 27 21 228 100 0.092 23.1 3.206E+05 3 .480E+06. 26.0 ± 6.3 28 7 109 25 0.064 44.1 4.274E+05 6.655E+06 18.1 ± 7.2 29 11 175 80 0.063 22.2 2.099E+05 3.339E+06 17.8 ± 5.7 30 13 101 70 0.129 14.6 2.835E+05 2.202E+06 36.3 ± 11.1 31 13 155 70 0.084 22.4 2.835E+05 3.380E+06 23.7 ± 7.1 315 3388 18.6 2.610E+05 2.808E+06 Area of basic unit = 6.551E-07 cm-2 CHI SQUARED = 20.6935 WITH 30 DEGREES OF FREEDOM P(chi squared) = 3.1 % CORRELATION COEFFICIENT = 0.934 VARIANCE OF SQR(Ns) = 2.456724 V ARIANCE OF SQR(Ni) = 23.64121 Ns¡Ni = 0.093 ± 0.005 MEAN RATIO = 0.111 ± 0.016 Pooled Age AGE = 26.2 ± 2.7 Ma Mean Age = 31.3 + 5.2 Ma Central Age = 25.6 ± 2.0Ma % Variation = 20.47% Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 8/9 GMC Data Report No. 220 93BAll Apatite E. Simpson #2 Core 4 (6705-6713') IRRADIATION WY-91/92-93 COUNTED BY: JMM No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T.AGE(Ma) 1 23 25 24 0.920 10.5 1.463E+06 1.590E+06 255.2 ± 76.8 2 4 43 18 0.093 24.2 3.392E+05 3.64 7E+06 26.3 ± 13.9 3 4 23 40 0.174 5.8 1.526E+05 8.777E+05 49.0 ± 26.9 4 5 45 32 0.111 14.2 2.385E+05 2. 147E+06 31.4 ± 15.0 5 11 22 30 0.500 7.4 5.597E+05 1. 119E+06 139.9 ± 53.0 6 20 103 28 0.194 37.2 1.090E+06 5.615E+06 54.7 ± 14.1 7 51 211 30 0.242 71.2 2.595E+06 1.074E+07 68.0 ± 12.1 8 8 42 32 0.190 13.3 3.816E+05 2.004E+06 53.7 ± 21.2 9 8 53 36 0.151 14.9 3.392E+05 2.247E+06 42.6 ± 16.5 10 3 9 21 0.333 4.3 2.181E+05 6.542E+05 93.6 ± 62.9 11 3 19 28 0.158 6.9 1.636E+05 1.036E+06 44.5 ± 27.9 12 18 62 32 0.290 19.6 8.586E+05 2.9S8E+06 81.6 ± 22.9 13 8 61 50 0.131 12.4 2.442E+05 1.862E+06 37.0 ± 14.3 14 12 133 40 0.090 33.7 4.579E+05 5.076E+06 25.5 ± 8.0 15 15 21 25 0.714 8.5 9.159E+05 1.282E+06 199.0 ± 69.4 16 4 6 20 0.667 3.0 3.053E+05 4.579E+OS 185.9 ±121.0 17 12 30 30 0.400 10.1 6.106E+05 1.526E+06 112.2 ± 39.5 18 6 25 32 0.240 7.9 2.862E+05 1. 193E+06 67.5 ± 31.2 19 4 9 24 0.444 3.8 2.544E+05 5.724 E+05 124.5 ± 75.6 20 12 37 40 0.324 9.4 4.579E+05 1.412E+06 91.1 ± 31.2 21 5 15 28 0.333 5.4 2.726E+05 8.178E+05 93.6 ± 49.0 22 6 26 24 0.231 11.0 3.816E+05 1.6S4E+06 65.0 ± 29.9 23 12 31 25 0~387 12.6 7.327E+05 1.893E+06 108.6 ± 38.1 24 2 33 30 0.061 11.1 1.018E+05 1.679E+06 17.1 ± 12.6 25 12 88 64 0.136 13.9 2.862E+05 2.099E+06 38.5 ± 12.3 26 3 21 24 0.143 8.9 1.908E+05 1.336E+06 40.3 ± 25.1 27 6 20 32 0.300 6.3 2.862E+05 9.541E+05 84.3 ± 39.9 28 3 83 32 0.036 26.3 1.431E+05 3.959E+06 10.2 ± 6.1 29 1 26 25 0.038 10.5 6.106E+04 I.S88E+06 10.9 ± 11.1 30 6 35 40 0.171 8.9 2.290E+05 1.336E+06 48.3 ± 21.7 31 14 30 15 0.467 20.3 1.425E+06 3.0S3E+06 130.7 ± 43.7 301 1387 14.8 4.831E+05 2.226E+06 Area of basic unit = 6.551E-07 cm-2 CHI SQUARED = 55.30558 WITH 30 DEGREES OF FREEDOM P(chi squared) = 0.0 % CORRELATION COEFFICIENT = 0.738 V ARIANCE OF SQR(Ns) = 1.515821 VARIANCE OF SQR(Ni) = 6.727523 Ns/Ni = 0.217 ± 0.014 MEAN RATIO = 0.280 ± 0.037 Pooled Age = 61.1 ± 6.5 Ma Mean Age = 78.7 ± 12.4 Ma Central Age = 67.5 ± 8.6Ma % Variation = 57.59% Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 9/9 GMC Data Report No. 220 No. Ns Ni Na RATIO U(ppm) RHOs RHOi F.T.AGE(Ma) 1 29 208 49 0.139 43.0 9.034E+05 6.480E+06 39.3 ± 8.5 2 5 37 18 0.135 20.8 4.240E+05 3.138E+06 38.1 ± 18.4 3 6 44 14 0.136 31.8 6.542E+05 4.798E+06 38.5 ± 17.1 4 5 21 60 0.238 3.5 1.272E+05 5.343E+05 67.0 ± 33.8 5 28 102 50 0.274 20.7 8.548E+05 3. 114E+06 77.2 ± 17.7 6 9 45 16 0.200 28.5 8.586E+05 4.293E+06 56.3 ± 21.1 7 1 12 16 0.083 7.6 9.541E+04 1. 145E+06 23.5 ± 24.6 8 1 13 35 0.077 3.8 4.361 E+04 5.670E+05 21.7 ± 22.6 9 4 34 49 0.118 7.0 1.246E+05 1.059E+06 33.2 ± 17.8 10 15 127 60 0.118 21.4 3.816E+05 3.231 E+06 33.3 ± 9.5 11 7 20 18 0.350 11.2 5.936E+05 1.696E+06 98.3 ± 44.0 12 2 18 64 0.111 2.8 4.770E+04 4.293E+05 31.4 ± 23.5 13 3 10 40 0.300 2.5 1. 145E+05 3.816E+05 84.3 ± 56.0 115 691 14.3 3.590E+05 2.157E+06 Area of basic unit = 6.551E-07 cm-2 CHI SQUARED = 7.394046 WITH 12 DEGREES OF FREEDOM P(chi squared) = 11.3 % CORRELATION COEFFICIENT = 0.901 V ARIANCE OF SQR(Ns) = 2.057863 V ARIANCE OF SQR(Ni) = 11.73058 Ns/Ni = 0.166 ± 0.017 MEAN RATIO = 0.175 ± 0.025 Pooled Age = 46.9 ± 6.2 M~ Mean Age = 49.4 ± 8.1 Ma Central Age = 47.7 ± 6.0Ma % Variation = 19.79% Ages calculated using a zeta of 12250 ± 1000 for SRM963a glass RHO D = 4.619E+04cm-2; ND = 1907 COUNTED BY: JMM IRRADIATION WY -94195-93 93BA13 Apatite Fish Creek #1 Core 64/65 (6005-6011')
