Journal of Geological Research / 2013 / Article / Tab 5 / Research Article
Magmatism in the Asunción-Sapucai-Villarrica Graben (Eastern Paraguay) Revisited: Petrological, Geophysical, Geochemical, and Geodynamic Inferences Table 5 Average chemical analyses (recalculated to 100 wt% on anhydrous basis; in parentheses, standard deviation) of mantle xenoliths (LK and HK suites, K
2 O <0.15 wt%, and >0.2 wt%, resp.from ASV [
53 ,
54 ,
56 ]. The age is the average of ages of Table
4 . The bleb is a representative glassy drop in an H-K harzburgite [
54 ,
56 ].
Whol-rock L-K L-K H-K H-K H-K lherzolite harzburgite lherzolite harzburgite bleb No. of samples (5) (6) (3) (2) (1) Wt% SiO2 44.02 (1.15) 43.95 (0.35) 44.65 (0.11) 44.63 (0.20) 46.15 TiO2 0.03 (0.02) 0.01 (0.00) 0.07 (0.03) 0.02 (0.00) 0.70 Al2 O3 1.76 (0.86) 1.14 (0.50) 2.37 (0.04) 1.36 (0.03) 10.10 FeOtot 7.97 (0.13) 7.85 (0.22) 7.92 (0.24) 7.52 (0.01) 6.74 MnO 0.12 (0.01) 0.11 (0.00) 0.11 (0.01) 0.11 (0.00) 0.14 MgO 44.17 (1.87) 45.58 (1.60) 41.55 (0.46) 44.76 (0.21) 23.67 CaO 1.75 (0.86) 1.18 (0.69) 2.64 (0.23) 1.12 (0.02) 6.56 Na2 O 0.12 (0.01) 0.10 (0.05) 0.28 (0.01) 0.16 (0.01) 2.00 K2 O 0.09 (0.04) 0.06 (0.04) 0.39 (0.10) 0.32 (0.00) 3.10 P2 O5 0.21 (0.10) 0.01 (0.01) 0.01 (0.00) 0.02 (0.00) 0.83
ppm La 1.69 (0.12) 2.87 (0.51) 2.66 (0.52) 6.71 (0.69) 77.39 Ce 1.53 (0.09) 4.09 (0.75) 3.35 (0.67) 8.45 (0.81) 106.25 Nd 0.20 (0.01) 0.28 (0.16) 0.96 (0.55) 2.42 (0.25) 27.74 Sm 0.012 (0.004) 0.038 (0.015) 0.260 (0.014) 0.51 (0.20) 4.16 Eu 0.001 (0.001) 0.006 (0.002) 0.010 (0.01) 0.020 (0.006) 1.00 Gd 0.07 (0.008) 0.04 (0.01) 0.37 (0.02) 0.74 (0.03) 2.92 Dy 0.10 (0.01) 0.05 (0.01) 0.43 (0.02) 0.91 (0.04) 2.61 Er 0.07 (0.001) 0.05 (0.01) 0.30 (0.01) 0.65 (0.06) 1.68 Yb 0.07 (0.001) 0.08 (0.01) 0.29 (0.01) 0.63 (0.03) 1.23 Lu — — — — Cr 2601 (350) 2421 (357) 2360 (88) 2635 (30) 38114 Ni 2307 (160) 2309 (102) 2120 (4) 2307 (73) 1124 Rb 3.33 (9.51) 2.67 (1.63) 7.50 (2.12) 6.00 (1.41) 120 Sr 22.41 (10.47) 11.15 (4.58) 28.89 (10.29) 64.67 (7.62) 1414 Ba 20.0 (10.0) 4.67 (1.18) 40 (8) 34.5 (14.8) 1781 Th — — — — — U — — — — — Ta — — — — Nb 5.91 (0.58) 1.78 (0.20) 6.39 (1.77) 6.98 (1.01) 155 Zr 5.95 (0.41) 6.08 (0.45) 6.90 (0.13) 7.86 (0.93) 189 Y 0.51 (0.10) 0.72 (0.09) 2.62 (0.09) 5.70 (1.08) 14.70
Measured (87 Sr/86 Sr) 0.70426 (0.00005) 0.70421 (0.00038) 0.70416 (0.00006) 0.70395 (0.00002) — (143 Nd/144 Nd) 0.51264 (0.00007) 0.51275 (0.00039) 0.51299 (0.00033) 0.51288 (0.00005) —
Age
—
Initial ratio (87 Sr/86 Sr)i 0.70398 0.70376 0.70367 0.70377 — (143 Nd/144 Nd)i 0.51263 0.51272 0.51294 0.51285 —
427 448 446 453 —
Sr
—
Nd1.06 2.92 7.08 5.16 —
