Genesis of Late Triassic Harasu porphyritic syenogranite in Zalantun area, Inner Mongolia: Zircon U-Pb age, Hf isotope and geochemical evidence
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摘要:
对内蒙古扎兰屯哈拉苏斑状正长花岗岩进行年代学、地球化学和Hf同位素组成研究。LA-ICP-MS锆石测年结果指示，哈拉苏斑状正长花岗岩于晚三叠世（213.17±0.93 Ma）侵位，矿物组合以石英、碱性长石和斜长石为主，富SiO2（72.56%~74.36%）、K2O（4.74%~5.49%），贫MgO（0.12%~0.34%）、CaO（0.54%~0.95%）、TiO2（0.19%~0.29%）和P2O5（0.042%~0.053%），A/CNK=1~1.05，小于1.1，强烈亏损Ba、Sr、Eu、P、Ti，表现出铝质A型花岗岩的矿物组合及地球化学特征。哈拉苏A型花岗岩具有高的εHf（t）值（+9.08~+15.3），可能源于新生中基性地壳物质的部分熔融。哈拉苏A型花岗岩形成于后碰撞构造环境。可能受古亚洲洋闭合的远程效应影响，扎兰屯地区地壳加厚并向后造山伸展机制转换，随后在晚三叠世形成了扎兰屯地区哈拉苏斑状正长花岗岩。
Abstract:In this paper, the geochronology, geochemistry and Hf isotopic composition of the Harasu porphyritic syenogranite in Zalantun, Inner Mongolia were studied.LA-ICP-MS zircon dating indicates that the Harasu porphyritic syenogranite was emplaced during the Late Triassic(213.17±0.93 Ma).The mineral assemblage is mainly composed of quartz, alkaline feldspar and plagioclase.The Harasu porphyritic syenogranite is characterized by high SiO2(72.56%~74.36%), K2O(4.74%~5.49%), low MgO(0.12%~0.34%), CaO(0.54%~0.95%), TiO2(0.19%~0.29%) and P2O5(0.042%~0.053%), A/CNK=1~1.05, < 1.1.It is strongly depleted in Ba, Sr, Eu, P and Ti, showing the geochemical characteristics of aluminous A-type granite.The Harassu A-type granites have high εHf(t) values(+9.08~+15.3), which may due to the partial melting of new meso-basic crustal materials.The Harasu A-type granite is recognized as the product of a post-orogenic tectonic.The crust in Zalantun area was thickened and transformed into a post orogenic extension mechanism, which may be affected by the remote effect of the closure of the Paleo-Asian Ocean, and then the Late Triassic Harasu porphyritic syenogranite in Zalantun area was formed.
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图 5 哈拉苏斑状正长花岗岩稀土元素球粒陨石标准化分布型式图(a)与微量元素原始地幔标准化蛛网图(b)(球粒陨石和原始地幔标准化数值据Sun et al., 1989)
Figure 5.
图 6 哈拉苏斑状正长花岗岩岩石类型判别图解(图a底图据Collins et al., 1982；b据Eby，1990；c、d据Whalen et al., 1987; e、f据Frost et al., 2001; g、h据Dall'Agnol et al., 2007)
Figure 6.
图 7 哈拉苏斑状正长花岗岩t-εHf(t)图解(兴蒙造山带东段Hf同位素组成据Yang et al., 2006)
Figure 7.
图 8 哈拉苏斑状正长花岗岩构造判别图解(图a、b底图据 Maniar et al., 1989; 图c底图据Pearce et al., 1984；图d底图据Batchelor et al., 1985)
Figure 8.
表 1 哈拉苏斑状正长花岗岩锆石LA-ICP-MS U-Th-Pb同位素分析结果
Table 1. Zircon LA-ICP-MS U-Th-Pb dating results of the porphyritic syenogranite in Harasu area
测点 含量/10-6 Th/U 同位素比值 年龄/Ma Pb U Th 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ B4.HLSA.1 3 86 67 0.78 0.0504 0.0023 0.2343 0.0105 0.0337 0.0003 215 104 214 10 214 2 B4.HLSA.2 18 478 295 0.62 0.0506 0.0009 0.2363 0.0045 0.0339 0.0003 222 42 215 4 215 2 B4.HLSA.3 7 167 250 1.49 0.0501 0.0039 0.2327 0.0186 0.0337 0.0006 199 182 212 17 214 3 B4.HLSA.4 51 1393 907 0.65 0.0511 0.0006 0.2353 0.0033 0.0334 0.0003 245 29 215 3 212 2 B4.HLSA.5 24 640 490 0.77 0.0508 0.0006 0.2349 0.0033 0.0336 0.0003 231 29 214 3 213 2 B4.HLSA.6 6 148 120 0.81 0.0514 0.0017 0.2384 0.0083 0.0336 0.0004 261 77 217 8 213 2 B4.HLSA.7 41 1146 684 0.60 0.0509 0.0006 0.2350 0.0032 0.0335 0.0003 235 27 214 3 212 2 B4.HLSA.8 12 324 247 0.76 0.0511 0.0009 0.2350 0.0044 0.0334 0.0003 245 41 214 4 212 2 B4.HLSA.9 41 1123 836 0.74 0.0510 0.0006 0.2370 0.0032 0.0337 0.0003 243 27 216 3 213 2 B4.HLSA.10 71 1936 1373 0.71 0.0518 0.0006 0.2400 0.0033 0.0336 0.0004 275 26 218 3 213 2 B4.HLSA.11 27 741 458 0.62 0.0509 0.0006 0.2351 0.0033 0.0335 0.0003 238 29 214 3 212 2 B4.HLSA.12 11 329 121 0.37 0.0498 0.0018 0.2361 0.0088 0.0344 0.0004 186 86 215 8 218 2 B4.HLSA.13 4 112 110 0.98 0.0510 0.0020 0.2376 0.0096 0.0338 0.0004 241 88 216 9 214 2 B4.HLSA.14 3 80 88 1.10 0.0515 0.0034 0.2379 0.0169 0.0335 0.0004 262 150 217 15 213 3 B4.HLSA.15 5 131 125 0.95 0.0493 0.0015 0.2259 0.0073 0.0332 0.0003 164 72 207 7 211 2 B4.HLSA.16 17 461 358 0.78 0.0505 0.0007 0.2338 0.0036 0.0336 0.0004 217 33 213 3 213 2 B4.HLSA.17 22 635 290 0.46 0.0524 0.0007 0.2394 0.0038 0.0331 0.0004 303 31 218 3 210 2 B4.HLSA.18 20 564 296 0.52 0.0511 0.0007 0.2387 0.0037 0.0339 0.0003 247 33 217 3 215 2 B4.HLSA.19 45 1258 735 0.58 0.0511 0.0006 0.2357 0.0035 0.0335 0.0004 244 27 215 3 212 2 B4.HLSA.20 5 118 106 0.90 0.0509 0.0022 0.2380 0.0108 0.0339 0.0004 237 99 217 10 215 3 B4.HLSA.21 3 83 73 0.88 0.0511 0.0039 0.2385 0.0187 0.0339 0.0004 243 175 217 17 215 3 B4.HLSA.22 38 1112 484 0.44 0.0519 0.0007 0.2400 0.0037 0.0335 0.0004 280 29 218 3 213 2 B4.HLSA.23 21 495 783 1.58 0.0504 0.0007 0.2338 0.0038 0.0336 0.0004 215 33 213 3 213 2 B4.HLSA.24 11 274 360 1.31 0.0509 0.0011 0.2379 0.0053 0.0339 0.0004 238 49 217 5 215 2 
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表 2 哈拉苏斑状正长花岗岩锆石Hf同位素分析结果
Table 2. Zircon Hf dating results of the porphyritic syenogranite in Harasu area
样品号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ εHf(t) TDM/Ma TDMc/Ma fLu/Hf HLSA1-1.xls 213.17 0.04514 0.001614 0.283016 0.000026 13.11 339 411 -0.95 HLSA1-2.xls 213.17 0.06592 0.002088 0.283008 0.00002 12.76 355 433 -0.94 HLSA1-3.xls 213.17 0.03371 0.001133 0.282984 0.000021 12.05 381 480 -0.97 HLSA1-4.xls 213.17 0.06785 0.002123 0.283 0.000023 12.47 367 452 -0.94 HLSA1-5.xls 213.17 0.0421 0.001332 0.282975 0.000019 11.69 395 501 -0.96 HLSA1-7.xls 213.17 0.0539 0.001717 0.282903 0.000017 9.08 504 669 -0.95 HLSA1-9.xls 213.17 0.07692 0.002348 0.282984 0.000022 11.87 393 490 -0.93 HLSA1-12.xls 213.17 0.05691 0.001767 0.283079 0.000027 15.3 249 269 -0.95 HLSA1-13.xls 213.17 0.03754 0.001272 0.282952 0.00002 10.88 428 554 -0.96 HLSA1-14.xls 213.17 0.038 0.001194 0.282958 0.000021 11.09 418 539 -0.96 HLSA1-16.xls 213.17 0.03927 0.001263 0.28291 0.000017 9.39 488 649 -0.96 HLSA1-17.xls 213.17 0.05975 0.001868 0.282987 0.000017 12.05 384 480 -0.94 HLSA1-21.xls 213.17 0.04168 0.001368 0.282931 0.000022 10.14 459 602 -0.96 HLSA1-22.xls 213.17 0.08942 0.002779 0.28304 0.000025 13.78 315 368 -0.92 HLSA1-24.xls 213.17 0.04112 0.0013 0.282902 0.000018 9.11 500 668 -0.96
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表 3 哈拉苏斑状正长花岗岩主量、微量和稀土元素分析结果
Table 3. Major, trace and REE compositions of the porphyritic syenogranite in Harasu area
元素 B4/1 B5/1 B5/2 B6/1 B6/2 B6/3 元素 B4/1 B5/1 B5/2 B6/1 B6/2 B6/3 SiO2 72.6 73.9 72.7 73.4 72.9 74.4 Ta 1.06 0.82 1.01 0.86 0.97 1.11 Al2O3 14.0 13.6 13.9 13.9 13.9 13.3 Zr 329 271 198 285 279 265 Fe2O3 1.22 1.12 1.08 1.06 1.04 1.05 Hf 9.88 8.62 7.18 8.57 8.92 8.07 FeO 0.3 0.18 0.28 0.33 0.23 0.19 Be 1.6 1.46 1.71 1.47 1.43 1.39 TFe2O3 1.55 1.32 1.39 1.43 1.30 1.26 Ga 13.5 12.5 13.3 13.5 12.2 12.4 TFeO 1.40 1.19 1.25 1.28 1.17 1.13 U 7.55 5.46 5.06 4.93 5.79 6.95 CaO 0.54 0.75 0.79 0.9 0.78 0.95 Th 15.2 11.6 15.2 13.1 11.6 13.1 MgO 0.34 0.15 0.19 0.23 0.14 0.12 La 43.4 32.6 47.9 40.1 37.5 42.1 K2O 5.49 5.32 5.17 4.94 5.12 4.74 Ce 105 86 115.8 92.4 99.2 102.3 Na2O 4.33 4.06 4.23 4.21 4.14 3.85 Pr 11.1 8.12 13.3 10.2 10.1 12.1 TiO2 0.29 0.23 0.25 0.26 0.21 0.19 Nd 39.6 29 48.7 36.9 34.3 46.1 P2O5 0.04 0.04 0.05 0.05 0.04 0.05 Sm 6.93 4.72 7.53 6.45 5.88 6.69 MnO 0.10 0.08 0.09 0.09 0.08 0.07 Eu 0.43 0.32 0.48 0.4 0.37 0.41 烧失量 0.62 0.57 0.61 0.65 0.57 0.62 Gd 5.64 4.08 6.13 5.42 4.87 5.23 CO2 0.06 0.06 0.06 0.06 0.06 0.06 Tb 0.8 0.6 0.84 0.8 0.67 0.81 A/NK 1.07 1.09 1.11 1.13 1.13 1.16 Dy 4.1 3.09 4.82 4.31 3.34 4.45 A/CNK 1.01 1 1.01 1.02 1.05 1.03 Ho 0.8 0.58 0.87 0.8 0.63 0.83 TFeO/MgO 4.11 7.92 6.59 5.58 8.33 9.46 Er 2.16 1.66 2.33 2.2 1.95 2.21 K2O/Na2O 1.27 1.31 1.22 1.17 1.24 1.23 Tm 0.31 0.24 0.34 0.32 0.28 0.33 Cr 3.61 2.81 3.83 4.81 3.51 3.12 Yb 2.02 1.62 2.31 2.12 1.93 2.24 Ni 3.35 2.18 3.15 3.31 2.24 2.47 Lu 0.29 0.25 0.39 0.34 0.28 0.36 Co 1.02 0.45 0.73 1.01 0.39 0.81 Y 17.5 13.6 21.4 19 19.7 20.1 Li 0.75 0.52 1.45 1.72 0.87 1.29 ΣREE 223 173 252 203 201 226 Rb 108 104 98 82.2 172 239 LREE 206 161 234 186 187 210 Cs 2.74 2.1 3.03 3.2 2.36 2.25 HREE 16.1 12.1 18.0 16.3 14.0 16.5 W 0.85 0.52 0.64 0.7 0.51 0.62 (La/Yb)N 15.4 14.4 14.9 13.6 13.9 13.5 Mo 1.75 1.08 1.17 1.35 1.01 0.93 δEu 0.21 0.22 0.22 0.21 0.21 0.21 Sr 98.8 106 78.6 98.7 87.3 73.1 R1 2002 2227 2134 2227 2194 2486 Ba 217 217 223 211 305 249 R2 352 356 371 383 368 372 V 10.3 9.1 10.6 11.7 9.2 8.9 Mg# 30.2 18.4 21.3 24.2 17.6 15.9 Nb 16.3 12.8 16.3 14.4 21.8 17.4 σ43 3.25 2.84 2.96 2.75 2.85 2.34 注：主量元素含量单位为%，微量元素含量单位为10-6。R1=4Si-11(Na+K)-2(Fe+Ti), R2=6Ca+2Mg+Al, 式中元素指千阳离子
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