Element Concentration in La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Question 2 CI chondrites /ppm 2.347E-01 6.032E-01 8.90E-02 4.524E-01 1.471E-01 5.60E-02 1.966E-01 3.63E-02 2.427E-01

5.56E-02 1.589E-01 2.42E-02 1.625E-01 2.43E-02 Concentration Concentration in specimen in specimen 1 /ppm 2/ppm 1.91E+01 4.93E+01 7.43 3.57E+01 1.10E+01 1.82 1.48E+01 2.37 1.56E+01 3.11 8.84 1.19 7.46 9.69E-01 Table 1 4.55E+01 1.44E+02 20.69 1.15E+02 4.05E+01 1.11E+01 5.33E+01 9.39 5.92E+01 1.24E+01 3.69E+01 4.81 3.44E+01 4.78/nOxygen Isotope d180 d170 Specimen Specimen 1 2 2.85 4.23 1.66 2.35 Table 2 a. Using a spreadsheet package and the data in Table 1, determine the chondrite-normalized values for each element for the two meteorite specimens. Report your calculations to an appropriate number of significant figures. You can report your chondrite-normalized data in any of the following notations: '78.8', or '7.88E+01', or $7.88 × 10¹¹./nb. Plot the chondrite-normalized REE abundances of the two specimens. You can use Figure 9.20 in ISS as an example for plotting your data but make sure that your plot also shows all data points (connected by a continuous line) for each element, giving an overall REE pattern. Also note that there is no need to include a gap to indicate the absence of data for promethium, as shown in Figure 9.20. Remember to include an appropriate title and axes headings in your plot. Figure 9.20 Rare earth element abundances in Juvinas and in basalts from the Earth. The data are related to the abundances present in CI chondrites (which, if plotted, would fall on a horizontal line at a value of 1). Since different rock types show a wide range of REE abundances it is useful to plot the data on a logarithmic scale. Note that there are no data for promethium since this element is entirely radioactive. It is a common practice to omit promethium from these plots as the data for the remaining 14 REEs are connected by a continuous curve. Beware: Plotting with a 'chondritic pattern' does not imply that Juvinas is actually a chondrite (which texturally it is not anyway). The plotted pattern merely shows that the relative abundances of REES in Juvinas are the same as within chondrites (in this case all enriched by a factor of about 8). abundance relative to CI chondrites 1000 100 basalts from the Earth Juvinas lanthanum cerium praseodymium neodymium promethium samarium unidoma gadolinium terbium Figure 9.20 typed dysprosium holmium erbium thulium ytterbium How might the parent body have been heated? T lutetium/nc. suggest a reasonable explanation for these REE patterns, including why the two meteorites exhibit different patterns. d. Figure 1 is a template for plotting 170 versus 180 values of the two meteorite specimens given in Table 1. The terrestrial fractionation line (TFL) is shown as a solid line. Plot the oxygen isotope data given in Table 2 for these meteorites on Figure 1. Comment on their relationship with respect to the TFL and suggest, giving reasons, possible explanations for where each specimen falls on this plot. (About 100 words) 8170/%0 3 2.5 2 1.5 1 2.5 3.0 3.5 4.0 8180/% 4.5 5.0 5.5/ne. Taking into account the activity you carried out in parts a. to d. of this question, and with reference to the evidence in Table 1, Table 2 and Figure 1, discuss the possible nature of the parent body or bodies for Specimens 1 and 2. Your answer should be a coherent argument that draws together lines of evidence to reach your conclusion. Note that you may find that you are repeating some of the answers you provided in a. to d., but this is acceptable in the context of this question.