Late Jurassic A-type granite in Sharhada, West Ujimqin, Inner Mongolia: geochemical characteristics, petrogenesis and geodynamic setting
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摘要:
内蒙古西乌旗沙尔哈达花岗岩侵入于贺根山缝合带蛇绿岩中。LA-ICP-MS锆石测年指示，沙尔哈达花岗岩岩株于晚侏罗世(154.6±1.2 Ma)侵位，矿物组合以石英、碱性长石和斜长石为主，富SiO2(74.86%~75.97%)、K2O(4.4%~4.95%)，贫MgO(0.044%~0.22%)、CaO(0.38%~0.77%)、TiO2(0.046%~0.18%)和P2O5(0.007%~0.042%)，A/CNK=1.03~1.09, 小于1.1，强烈亏损Ba、Sr、Eu、P、Ti，具有典型的右倾“海鸥型”稀土元素分配模式，表现出典型的铝质A型花岗岩的矿物组合及地球化学特征。沙尔哈达A型花岗岩具有低的(87Sr/86Sr)i值(0.7014~0.70374)、低正εNd(t)值(+3.96~+4.31)、高的εHf(t)值(+10.54~+14.72)。同位素地球化学特征指示，沙尔哈达花岗岩可能源于新生的中基性地壳物质部分熔融及其后的结晶分异作用。沙尔哈达A型花岗岩为晚侏罗世蒙古-鄂霍茨克洋闭合后造山伸展作用的产物，和蒙古-华北北部地块散布的其他A型花岗岩共同指示中晚侏罗世广泛的中下地壳伸展。
Abstract:The Sharhada granite in West Ujimqin, Inner Mongolia intruded into ophiolite in Hegenshan suture. LA-ICP-MS zircon dating indicates that the Sharhada granite was emplaced in the Late Jurassic (154.6±1.2 Ma). The mineral assemblage of the Shardaha granite is mainly composed of quartz, alkali feldspar and plagioclase. The granite is characterized by high SiO2 (74.86%~75.97%), K2O(4.4%~4.95%), low MgO (0.044%~0.22%), CaO (0.38%~0.77%), TiO2 (0.046%~0.18%) and P2O5 (0.007%~0.042%), A/CNK = 1.03~1.09 < 1.1. It is strongly depleted in Ba, Sr, Eu, P and Ti, with a typical right dipping "Seagull-type" REE distribution pattern, showing the geochemical characteristics of typical aluminous A-type granite. The Sharhada A-type granite has low (87Sr/86Sr)i (0.7014~0.70374), positive εNd(t) values (+ 3.96~+ 4.31) and high εHf(t) (+ 10.54~+ 14.72), which may due to the partial melting of the newly formed intermediate/basic crustal materials and the subsequent crystallization differentiation. Furthermore, together with other A-type granites scattered in the Mongolia-Northern North China block, the Sharhada A-type granite is recognized as the product of the post-orogenic extension of the Mongolian-Okhotsk tectonic domain in the Late Jurassic, which indicates the extensive middle-lower crust extension in the Middle-Late Jurassic.
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图 6 沙尔哈达花岗岩SiO2-TFeO/MgO(a)、SiO2-Zr(b)、SiO2-Nb(c)、SiO2-TFeO/(TFeO+MgO)(d)、SiO2-(Na2O+K2O-CaO)(e)、Al2O3-TFeO/(TFeO+MgO)(f)和Al2O3/(K2O/Na2O)-TFeO/(TFeO+MgO)(g)图解
Figure 6.
表 1 沙尔哈达岩体LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. Zircon LA-ICP-MS U-Th-Pb dating results of the Sharhada granite
测点号 含量/10-6 同位素比值 年龄/Ma Pb U 207Pb
/206Pb1σ 207Pb
/235U1σ 206Pb
/238U1σ 207Pb
/206Pb1σ 207Pb
/235U1σ 206Pb
/238U1σ 1 28 1138 0.0493 0.0010 0.1636 0.0037 0.0241 0.0003 160 49 154 4 153 2 2 17 682 0.0508 0.0014 0.1724 0.0048 0.0246 0.0003 230 62 161 4 157 2 3 68 2695 0.0561 0.0014 0.1909 0.0050 0.0247 0.0003 457 55 177 5 157 2 4 24 885 0.0802 0.0018 0.2677 0.0063 0.0242 0.0003 1202 45 241 6 154 2 5 24 917 0.0499 0.0010 0.1784 0.0038 0.0259 0.0003 191 49 167 4 165 2 6 30 1215 0.0499 0.0009 0.1698 0.0033 0.0247 0.0003 189 41 159 3 157 2 7 22 932 0.0496 0.0013 0.1617 0.0043 0.0237 0.0003 174 59 152 4 151 2 8 17 704 0.0525 0.0014 0.1709 0.0046 0.0236 0.0003 308 60 160 4 150 2 9 16 689 0.0529 0.0014 0.1713 0.0047 0.0235 0.0003 325 60 161 4 150 2 10 19 777 0.0484 0.0013 0.1576 0.0044 0.0236 0.0003 118 63 149 4 151 2 11 26 1101 0.0493 0.0010 0.1635 0.0036 0.0241 0.0003 162 47 154 3 153 2 12 25 1045 0.0615 0.0012 0.2019 0.0042 0.0238 0.0003 657 43 187 4 152 2 13 33 1393 0.0502 0.0009 0.1667 0.0032 0.0241 0.0003 204 42 157 3 153 2 14 20 759 0.0548 0.0043 0.1987 0.0159 0.0263 0.0003 405 177 184 15 167 2 15 13 556 0.0520 0.0026 0.1704 0.0089 0.0238 0.0003 287 115 160 8 151 2 16 30 1271 0.0492 0.0012 0.1619 0.0040 0.0239 0.0003 156 57 152 4 152 2 17 17 671 0.0501 0.0015 0.1731 0.0052 0.0251 0.0003 200 68 162 5 160 2 18 53 2206 0.0520 0.0008 0.1758 0.0029 0.0245 0.0003 285 34 164 3 156 2 19 14 554 0.0515 0.0021 0.1765 0.0075 0.0248 0.0003 265 95 165 7 158 2 20 14 576 0.0505 0.0016 0.1736 0.0056 0.0249 0.0003 220 71 163 5 159 2 21 18 761 0.0544 0.0020 0.1790 0.0068 0.0239 0.0003 386 83 167 6 152 2 22 22 928 0.0501 0.0011 0.1658 0.0039 0.0240 0.0003 199 51 156 4 153 2 23 35 1404 0.0495 0.0010 0.1725 0.0038 0.0253 0.0003 171 45 162 4 161 2 24 29 1233 0.0506 0.0009 0.1680 0.0034 0.0241 0.0003 223 42 158 3 153 2 25 17 733 0.0517 0.0015 0.1738 0.0055 0.0244 0.0003 272 66 163 5 155 2 26 80 2969 0.0533 0.0007 0.1926 0.0030 0.0262 0.0003 341 32 179 3 167 2 27 15 600 0.0501 0.0016 0.1687 0.0054 0.0244 0.0003 198 72 158 5 156 2 28 17 690 0.0515 0.0014 0.1749 0.0052 0.0246 0.0003 262 64 164 5 157 2 29 16 669 0.0514 0.0014 0.1721 0.0048 0.0243 0.0003 257 61 161 5 155 2 30 33 1367 0.0510 0.0009 0.1717 0.0036 0.0244 0.0003 239 43 161 3 156 2 31 21 851 0.0496 0.0014 0.1676 0.0052 0.0245 0.0003 177 68 157 5 156 2 32 29 1200 0.0493 0.0010 0.1658 0.0037 0.0244 0.0003 163 48 156 3 155 2 
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表 2 沙尔哈达花岗岩锆石Hf同位素分析结果
Table 2. Zircon Hf dating results of the Sharhada granite
样品号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ εHf(t) TDM/Ma TDMc/Ma fLu/Hf 1 154.6 0.0331 0.0011 0.283071 0.000025 13.87 256 316 -0.97 3 154.6 0.0376 0.0012 0.283088 0.000031 14.44 233 279 -0.96 7 154.6 0.0147 0.0005 0.283044 0.000024 12.99 289 372 -0.99 8 154.6 0.0314 0.0011 0.283042 0.000024 12.84 298 383 -0.97 9 154.6 0.0382 0.0012 0.283078 0.000024 14.12 247 302 -0.97 0 154.6 0.0383 0.0012 0.283074 0.000034 13.94 253 311 -0.96 10 154.6 0.0259 0.0008 0.283058 0.000029 13.45 273 345 -0.97 11 154.6 0.0405 0.0013 0.283060 0.000024 13.45 274 344 -0.96 13 154.6 0.0323 0.0010 0.283009 0.000034 11.68 344 457 -0.97 15 154.6 0.0336 0.0011 0.283091 0.000032 14.54 228 272 -0.97 16 154.6 0.0463 0.0014 0.283041 0.000027 12.77 302 387 -0.96 17 154.6 0.0358 0.0011 0.283031 0.000028 12.45 313 407 -0.97 18 154.6 0.0275 0.0009 0.283095 0.000027 14.72 221 261 -0.97 19 154.6 0.0669 0.0020 0.283064 0.000028 13.55 272 337 -0.94 20 154.6 0.0515 0.0019 0.283029 0.000025 12.28 324 419 -0.94 21 154.6 0.0204 0.0007 0.282992 0.000022 11.11 365 494 -0.98 22 154.6 0.0278 0.0010 0.283047 0.000027 13.02 290 371 -0.97 23 154.6 0.0483 0.0016 0.282978 0.000023 10.54 394 532 -0.95 24 154.6 0.0340 0.0011 0.283071 0.000022 13.87 256 316 -0.97 25 154.6 0.0308 0.0010 0.283043 0.000021 12.88 296 381 -0.97 27 154.6 0.0398 0.0013 0.283001 0.000026 11.36 358 477 -0.96 28 154.6 0.0368 0.0012 0.283071 0.000026 13.87 257 317 -0.96 29 154.6 0.0208 0.0007 0.283015 0.000024 11.92 333 442 -0.98 30 154.6 0.0215 0.0008 0.282981 0.000024 10.72 381 519 -0.98 31 154.6 0.0318 0.0011 0.282989 0.000021 10.97 373 503 -0.97 32 154.6 0.0338 0.0011 0.283022 0.000022 12.14 326 428 -0.97
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表 3 沙尔哈达花岗岩主量、微量和稀土元素分析结果
Table 3. Major, trace elements and REE compositions of the Sharhada granite
样品号 SZGS01-1 SZGS01-2 SZGS02-1 SZGS02-2 SZGS03 样品号 SZGS01-1 SZGS01-2 SZGS02-1 SZGS02-2 SZGS03 SiO2 75.97 75.78 75.7 74.86 75.12 Nb 19.3 47.4 22 22.2 27.9 Al2O3 13 13.25 12.71 13.1 12.84 Ta 3.23 5.62 2.62 2.16 2.92 FeO 0.65 0.81 1.41 1.46 1.5 Zr 165 94.3 258 262 277 Fe2O3 0.53 0.1 0.33 0.29 0.32 Hf 7.11 7.59 10.2 10.2 10.9 TFeO 1.13 0.90 1.71 1.72 1.79 Be 10.3 8.99 11.7 6.1 10.5 TFe2O3 1.25 1.00 1.90 1.91 1.99 U 2.06 1.39 1.98 2.09 1.68 CaO 0.47 0.38 0.46 0.56 0.77 Th 14.1 6.21 9.94 15 7.1 MgO 0.093 0.044 0.17 0.22 0.2 La 10.3 1.89 28 24 14.3 K2O 4.48 4.94 4.5 4.71 4.4 Ce 23.3 4.8 54.8 48.3 25.7 Na2O 3.96 4.16 3.62 3.75 3.81 Pr 3.1 0.83 6.4 6.93 3.69 TiO2 0.1 0.046 0.16 0.17 0.18 Nd 11.7 3.49 22.8 25.9 14.3 P2O5 0.025 0.007 0.033 0.036 0.042 Sm 2.74 1.13 5.02 5.57 2.93 MnO 0.026 0.03 0.041 0.043 0.047 Eu 0.08 0.01 0.13 0.21 0.12 烧失量 0.62 0.36 0.72 0.65 0.61 Gd 2.87 1.32 4.53 5.39 3.00 CO2 0.079 0.047 0.014 0.032 0.014 Tb 0.54 0.31 0.82 0.97 0.54 总量 100 99.95 99.87 99.88 99.85 Dy 3.42 2.33 4.68 5.86 3.39 A/NK 1.14 1.09 1.17 1.16 1.16 Ho 0.72 0.53 0.92 1.17 0.68 A/CNK 1.06 1.03 1.09 1.07 1.03 Er 2.25 1.74 2.69 3.57 2.07 TFeO/MgO 12.1 20.5 10.0 7.82 8.94 Tm 0.37 0.31 0.40 0.52 0.32 Cr 3.30 2.34 2.44 5.98 2.89 Yb 2.60 2.05 2.52 3.42 2.19 Ni 2.56 1.40 1.27 1.08 2.23 Lu 0.40 0.30 0.38 0.51 0.30 Co 0.69 0.24 0.72 0.83 0.88 Y 18.5 17.6 24.6 33.9 20.6 Li 20.8 103 37.6 38.2 63.4 ΣREE 64.4 21.0 134 132 73.5 Rb 249 344 259 241 235 LREE 51.2 12.2 117 111 61.0 Cs 5.11 14.6 5.73 5.26 6.93 HREE 13.2 8.89 16.9 21.4 12.5 W 1.43 0.69 4.43 1.59 0.63 (La/Yb)N 2.84 0.66 7.97 5.03 4.68 Mo 0.54 0.45 0.34 0.67 0.6 δEu 0.09 0.03 0.08 0.12 0.12 Sr 32.2 10.6 45 54.1 61.2 R1 2608 2422 2715 2562 2629 Ba 48.6 3.25 93.4 137 119 R2 312 304 310 330 347 V 6.09 1.95 6.06 7.46 7.05 Mg# 12.82 8.02 15.08 18.56 16.62 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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表 4 沙尔哈达花岗岩Sr-Nd同位素分析结果
Table 4. Sr-Nd isotopic data of the Sharhada granite
样品编号 年龄/Ma 87Rb/86Sr 87Sr/86Sr ISr 147Sm/144Nd 143Nd/144Nd INd εNd(t) TDM2/Ma fSm/Nd B1/BGD1 154.6 25.4394 0.759392 0.70348 0.1554 0.512799 0.512642 3.96 622 -0.21 B3/BGD3 154.6 18.7883 0.742696 0.70140 0.1411 0.512802 0.512659 4.29 594 -0.28 B4/BGD4 154.6 13.8245 0.734120 0.70374 0.1339 0.512795 0.512660 4.31 594 -0.32 B5/BGD5 154.6 12.2480 0.729856 0.70294 0.1344 0.512784 0.512648 4.08 612 -0.32
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