(7) (grads-10pts) Calculate the age of Gon05-216B using the inverse isochron method from the accompanying data. Why would this be regarded as a fairly reliable age? single-crystal ages. Table 1. "'Ar/Ar analytical data. ID ArPAr 37Ar/Ar 38 Ar/Ar (X 10% K/Ca Ark (x 10-15 mol) Ar* (%) Age (Ma) +10 (Ma) -5.3322 ESCASH 13, plagioclase, J=0.0007340.31%, D=1.003+0.001, NM-186K, Lab#=55440 xi 11 4.258 2.066 0.257 xi 08 4.275 -6.3973 1.064 0.439 xi 09 4.293 0.0660 3.003 0.500 7.7 xi 07 4.186 -0.8228 1.248 0.861 xi 06 4.342 0.7113 2.104 0.548 0.72 01 4.205 2.099 1.003 1.111 0.24 12 4.282 2.310 1.301 0.278 1.301 0.22 04 4.598 -0.3832 1.332 1.332 0.819 02 4.722 -0.8900 7122 1.417 0.801 13 4.190 18 -0.9766 -0.4984 0.288 05 4.271 0.6198 0.0833 1.828 0.82 14 4.748 0.6965 1.719 0.401 0.73 03 4.317 -0.9907 -0.6068 0.777 xi 10 4.396 5.642 -3.8646 0.232 0.090 Mean age 120 n=8 MSWD=0.43 0.5 +0.4 Isochron age + 20 n=8 MSWD=0.52 40 ArPAr= 300+200 75.0 79.9 79.5 89.5 87.1 97.2 95.6 90.7 89.5 101.5 100.7 90.6 102.2 136.9 4.18 4.47 4.49 4.92 4.97 5.38 5.39 3.39 5.48 5.56 5.59 : 5.66 5.66 5.80 7.94 5.57 5.57 0.75 0.39 0.32 0.20 0.33 0.15 0.68 0.00 0.27 6 0.26 0.63 0.11 0.38 0.27 0.83 0.15 0.18 17.58 45.97 1.476 GONO5 216B, Sanidine and plagioclase, J=0.0007451+0.05%, D=1.003:0.001, NM-192K, Lab#=55993 11 4.485 0.0505 1.665 1.014 10.1 89.1 14 0.1386 3.7 22.8 15 4.250 1.200 0.0345 0.8164 1.877 14.8 94.4 08 11.0 4.303 vo 0.0075 + . 0.0015 0.9858 0.977 67.8 93.2 12 6.538 12 0.8835 2:26 04.0 8.684 0.000 0.135 0.004 0.58 61.9 13 5.398 4:00 0.7071 19 4.774 0.761 0.72 10 74.9 0.14 2:10 4.690 10 2.033 0.0340 2.030 1.754 14.8 87.3 16 4.435 Or. 1990 0.5532 1.201 1.201 2014 0.310 0.92 93.0 06 4.309 0.0248 ie 7:04 0.5534 .6649 1.468 20.6 96.3 03 4.370 mo 0.0087 0.6106 0.583 58.5 95.9 xi 07 5.227 0.5366 3.118 0.183 0.95 83.2 xi 05 5.500 0.4911 3.610 0.171 1.0 81.3 xi 02 5.540 0.8506 3.452 0.245 0.60 82.9 xi 04 7.766 0.6869 10.09 0.242 62.3 Mean age 20 n=10 MSWD=0.92 19.2 +48.5 Isochron age 20 n=10 MSWD=1.0 Ar Ar= 294+4 5.365 5.37 5.384 5.385 2.00 5.43 2.40 5.43 2.10 5.492 14 5.54 5.566 5.62 5.84 6.01 6.16 6.50 5.44 5.45 0.088 0.13 0.049 0.089 0.00 0.62 0.11 0.063 0.28 0.072 0.14 0.45 0.48 0.34 0.36 0.06 0.06 0.74 GONO5 246, Plagioclase, J=0.0007479:0.05%, D=1.003+0.001, NM-192K, Lab#=55991 xi 15 9.681 5.575 35.80 0.042 0.092 xi 02 10.41 5.539 34.97 0.032 0.092 xi 14 38.05 11.22 128.1 0.042 0.045 xi 12 5.955 1.174 13.87 0.138 0.43 xi 01 10.53 25.21 35.18 0.032 0.020 xi 06 4.267 8.794 7.555 0.022 0.058 xi 11 47.59 2.257 152.1 0.377 0.23 xi 13 13.68 7.078 38.54 0.072 0.099 0.014 07 We 7.658 1.347 14.30 0.058 0.38 10 10.08 3.289 21.63 0.137 0.16 09 5.868 0.4316 5.602 0.316 1.2 xi 03 117.3 21.41 383.5 0.014 0.024 xi 05 13.99 6.844 0.9114 0.043 0.075 -4.5 5.1 2.9 32.8 21.1 64.7 5.9 21.0 46.3 2017 39.3 72.4 4.9 102.1 -0.6 0.7 1.5 2.64 3.0 3.7 3.80 3.90 4.8 5.34 5.72 7,9 19.3 2.0 3.1 2.3 0.67 3.1 4.9 0.45 0.94 1.8 0.74 0.32 8.1 2.6 (7) (grads-10pts) Calculate the age of Gon05-216B using the inverse isochron method from the accompanying data. Why would this be regarded as a fairly reliable age? single-crystal ages. Table 1. "'Ar/Ar analytical data. ID ArPAr 37Ar/Ar 38 Ar/Ar (X 10% K/Ca Ark (x 10-15 mol) Ar* (%) Age (Ma) +10 (Ma) -5.3322 ESCASH 13, plagioclase, J=0.0007340.31%, D=1.003+0.001, NM-186K, Lab#=55440 xi 11 4.258 2.066 0.257 xi 08 4.275 -6.3973 1.064 0.439 xi 09 4.293 0.0660 3.003 0.500 7.7 xi 07 4.186 -0.8228 1.248 0.861 xi 06 4.342 0.7113 2.104 0.548 0.72 01 4.205 2.099 1.003 1.111 0.24 12 4.282 2.310 1.301 0.278 1.301 0.22 04 4.598 -0.3832 1.332 1.332 0.819 02 4.722 -0.8900 7122 1.417 0.801 13 4.190 18 -0.9766 -0.4984 0.288 05 4.271 0.6198 0.0833 1.828 0.82 14 4.748 0.6965 1.719 0.401 0.73 03 4.317 -0.9907 -0.6068 0.777 xi 10 4.396 5.642 -3.8646 0.232 0.090 Mean age 120 n=8 MSWD=0.43 0.5 +0.4 Isochron age + 20 n=8 MSWD=0.52 40 ArPAr= 300+200 75.0 79.9 79.5 89.5 87.1 97.2 95.6 90.7 89.5 101.5 100.7 90.6 102.2 136.9 4.18 4.47 4.49 4.92 4.97 5.38 5.39 3.39 5.48 5.56 5.59 : 5.66 5.66 5.80 7.94 5.57 5.57 0.75 0.39 0.32 0.20 0.33 0.15 0.68 0.00 0.27 6 0.26 0.63 0.11 0.38 0.27 0.83 0.15 0.18 17.58 45.97 1.476 GONO5 216B, Sanidine and plagioclase, J=0.0007451+0.05%, D=1.003:0.001, NM-192K, Lab#=55993 11 4.485 0.0505 1.665 1.014 10.1 89.1 14 0.1386 3.7 22.8 15 4.250 1.200 0.0345 0.8164 1.877 14.8 94.4 08 11.0 4.303 vo 0.0075 + . 0.0015 0.9858 0.977 67.8 93.2 12 6.538 12 0.8835 2:26 04.0 8.684 0.000 0.135 0.004 0.58 61.9 13 5.398 4:00 0.7071 19 4.774 0.761 0.72 10 74.9 0.14 2:10 4.690 10 2.033 0.0340 2.030 1.754 14.8 87.3 16 4.435 Or. 1990 0.5532 1.201 1.201 2014 0.310 0.92 93.0 06 4.309 0.0248 ie 7:04 0.5534 .6649 1.468 20.6 96.3 03 4.370 mo 0.0087 0.6106 0.583 58.5 95.9 xi 07 5.227 0.5366 3.118 0.183 0.95 83.2 xi 05 5.500 0.4911 3.610 0.171 1.0 81.3 xi 02 5.540 0.8506 3.452 0.245 0.60 82.9 xi 04 7.766 0.6869 10.09 0.242 62.3 Mean age 20 n=10 MSWD=0.92 19.2 +48.5 Isochron age 20 n=10 MSWD=1.0 Ar Ar= 294+4 5.365 5.37 5.384 5.385 2.00 5.43 2.40 5.43 2.10 5.492 14 5.54 5.566 5.62 5.84 6.01 6.16 6.50 5.44 5.45 0.088 0.13 0.049 0.089 0.00 0.62 0.11 0.063 0.28 0.072 0.14 0.45 0.48 0.34 0.36 0.06 0.06 0.74 GONO5 246, Plagioclase, J=0.0007479:0.05%, D=1.003+0.001, NM-192K, Lab#=55991 xi 15 9.681 5.575 35.80 0.042 0.092 xi 02 10.41 5.539 34.97 0.032 0.092 xi 14 38.05 11.22 128.1 0.042 0.045 xi 12 5.955 1.174 13.87 0.138 0.43 xi 01 10.53 25.21 35.18 0.032 0.020 xi 06 4.267 8.794 7.555 0.022 0.058 xi 11 47.59 2.257 152.1 0.377 0.23 xi 13 13.68 7.078 38.54 0.072 0.099 0.014 07 We 7.658 1.347 14.30 0.058 0.38 10 10.08 3.289 21.63 0.137 0.16 09 5.868 0.4316 5.602 0.316 1.2 xi 03 117.3 21.41 383.5 0.014 0.024 xi 05 13.99 6.844 0.9114 0.043 0.075 -4.5 5.1 2.9 32.8 21.1 64.7 5.9 21.0 46.3 2017 39.3 72.4 4.9 102.1 -0.6 0.7 1.5 2.64 3.0 3.7 3.80 3.90 4.8 5.34 5.72 7,9 19.3 2.0 3.1 2.3 0.67 3.1 4.9 0.45 0.94 1.8 0.74 0.32 8.1 2.6