Petrogenesis of Plio-Pleistocene volcanic rocks from the chagai arc ...

Table 1. ContinuedElements Koh-e-Sultan Volcanics Batal Koh Volcanics& Ratios Ks-4 Ks-10 Ks-12a Bk-1 Bk-2 Bk-3 Bk-4 Bk-5 Bk-6 Bk-7SiO 2 63.55 63.89 64.83 59.6 59.53 59.36 59.64 59.14 57.49 57.45TiO 2 0.44 0.44 0.42 0.58 0.59 0.59 0.58 0.59 0.64 0.64Al 2 O 2 17.12 17.14 17.03 17.83 17.84 18.05 17.8 17.81 18.47 18.45Fe 2 O 3 4.7 4.57 4.36 6.09 6.18 6.29 6.24 6.23 6.88 6.78MnO 0.1 0.1 0.1 0.12 0.12 0.13 0.12 0.12 0.13 0.13MgO 2.86 2.74 2.55 3.38 3.29 3.4 3.43 3.35 3.46 3.4CaO 5.22 5.68 5.39 7.18 7.27 7.07 6.91 7.21 7.98 8.34Na 2 O 4.23 4.27 4.27 4.11 4.05 4.08 4.22 4.03 3.86 3.75K 2 O 1.01 1.04 0.92 0.92 0.93 0.84 0.88 0.88 0.88 0.84P 2 O 5 0.13 0.12 0.13 0.18 0.19 0.19 0.18 0.19 0.21 0.21FeOt/MgO 1.46 1.48 1.52 1.60 1.67 1.64 1.62 1.65 1.77 1.77K 2 O/Na 2 O 0.24 0.24 0.22 0.22 0.23 0.21 0.21 0.22 0.23 0.22Mg # 55 56 55 53 52 52 52 52 50 50Rb 19 19 29 18 18 14 17 18 16 15Sr 489 474 490 504 508 513 530 509 519 564Ba 419 406 502 365 368 414 362 320 314 353V 109 97 91 99 108 90 87 95 126 131Cr 102 33 27 64 85 45 123 45 65 44Co 16 32 36 16 18 32 19 36 19 22Ni 18 13 14 15 17 19 21 18 12 12Zr 73 71 75 113 112 115 112 108 101 101Y 11 12 11 16 16 16 16 16 16 17Nb 4 3 3 5 4 4 4 4 4 4Hf 1.39 17 17 17 20 16 17 20Ta 0.18 1.13 1.13 0.88 1.06 1.13 1.00 0.88Th 3.02 22.81 23.00 25.88 22.63 20.00 19.63 20.76U 1.02 3.23 3.29 3.60 3.23 2.96 3.11 3.50Sc 19 26 22 7.06 7.00 7.19 7.00 6.75 6.31 5.94La 15.90 22.60 28.00 28.75 28.00 27.00 25.25 25.25Ce 28.17 30.75 31.55 30.73 31.02 32.72 37.96 37.96Nd 12.58 35.09 32.72 39.27 39.93 37.20 30.43 29.26Sm 1.98 424 429 498 430 406 457 465Eu 0.91 20.92 20.98 16.84 20.18 22.83 23.26 19.75Gd 3.16 0.036 0.035 0.027 0.032 0.035 0.031 0.027Er 1.02 28 28 37 31 28 32 38Yb 1.34 0.31 0.25 0.25 0.25 0.25 0.25 0.24REE 65.06 1.13 1.00 0.89 0.95 0.89 1.42 1.67Eu N /Eu* 1.12 Ce N /Ce* 1.05 (La/Yb) N 7.91 (Ce/Yb) N 5.35 (La/Sm) N 4.94 (La/Ce) N 1.48 Th/Yb 2.25 Ta/Yb 0.13 La/Yb 11.87 Ce/Yb 21.02 Zr/Y 6.64 5.92 6.82 7.06 7.00 7.19 7.00 6.75 6.31 5.94Zr/Nb 18.25 23.67 25.00 22.60 28.00 28.75 28.00 27.00 25.25 25.25Ti/Zr 36.10 37.12 33.54 30.75 31.55 30.73 31.02 32.72 37.96 37.96Ti/V 24.18 27.17 27.65 35.09 32.72 39.27 39.93 37.20 30.43 29.26FeOt = Total iron as FeO, Mg # =100xMg /Mg+Fe +2 , SiO 2 -P 2 O 5 are in %, Rb-Yb are in ppm. REE ratios with N arechondrite normalized (after Nakamura, 1974), REE with * are interpolated values (see text for details).11