Abundant Apatite in Granulite 79215: Spoor of Another Volatile-rich Lunar Fluid
نویسنده
چکیده
79215; green=P, blue=Ca, red=Fe. Apatite is cyan; plagioclase is blue, olivine is red, opx is dark. Table 1. Average chemical analysis of 79215 apatite. Avg* 1 σ To 8 cations SiO2 0.41 0.02 Ti 0.001 TiO2 0.01 0.02 Al 0.001 Al2O3 0.01 0.02 Ce 0.002 Ce2O3 0.05 0.02 REE 0.012 REE2O3 0.21 ** Fe 0.014 FeO 0.20 0.06 Mn 0.002 MnO 0.02 0.02 Mg 0.017 MgO 0.14 0.03 Ca 4.973 CaO 54.86 0.15 Sr 0.002 SrO 0.05 *** Na 0.001 Na2O 0.01 0.01 K 0.000 K2O 0.00 0.00 P 2.939 P2O5 41.03 0.14 Si 0.002 SO2 0.03 0.00 S 0.034 F 3.34 0.14 F 0.893 Cl 0.66 0.02 Cl 0.091 O=F,Cl -1.55 0.06 Charge Total 99.46 0.25 Sum -0.011 *Average of 44 spot analyses. **Assuming chondritic relative REE abundances.***Assuming a chondritic Ca/Sr ratio. 5.025 octadhedral cations (green), ideally 5. 2.975 tetrahedral cations (yellow), ideally 3. 0.984 anions, ideally 1. ABUNDANT APATITE IN GRANULITE 79215: SPOOR OF ANOTHER VOLATILE-RICH LUNAR FLUID. A. H. Treiman and J. Gross. Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston TX 77058 (treiman#lpi.usra.edu). American Museum of Natural History, Central Park West at 79 St., NY NY 10024.
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