The petrogenesis of quartz diorite(350 Ma)from the Baiheshan area of the Beishan orogenic belt, and its chronological constraint on Hongshishan-Baiheshan Ocean's subduction initiation
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摘要:
对内蒙古白山岩浆弧内百合山石英闪长岩进行了LA-ICP-MS锆石U-Pb测年、Hf同位素及岩石地球化学分析。结果显示，该岩体的形成年龄为350.8±1.5 Ma，岩浆锆石的εHf（t）值在5.28~9.88之间，模式年龄为724~1018 Ma。地球化学数据显示，百合山石英闪长岩为一套I型钙碱性系列岩石，富碱（Na2O+K2O=6.03%~6.96%），富钠（Na2O/K2O>2），较低的Mg#（35.48~39.78）、Ni（2.06×10-6~5.54×10-6）和Cr（2.11×10-6~7.93×10-6）含量。相对富集轻稀土元素，重稀土分馏不明显，较低的（La/Yb）N值（4.28~5.60），无明显Eu异常，相对富集Rb、K、U等大离子亲石元素，亏损Nb、Ta、P、Ti等高场强元素等，地球化学成分表明，石英闪长岩具有俯冲带成因的特征。石英闪长岩的锆石U-Pb年龄和岩石成因证明了350 Ma石英闪长岩是晚古生代白山岩浆弧内首次发现的可以明确与红石山-百合山洋俯冲消减作用有关的最早的弧岩浆记录。表明红石山-百合山洋于约350 Ma之前就已经开始发生俯冲消减，比前人一般认为的俯冲开始的时间提前了22 Ma。
Abstract:In this paper, the precise dating of LA-ICP-MS zircon U-Pb and Hf isotope analysis and geochemical analysis were performed on Baiheshan quartz diorite from Baishan magmatic arc, Inner Mongolia.The results show that the formation age of the rock is 350.8±1.5 Ma and the εHf(t)values of magmatic zircon are between 5.28 and 9.88 with crustal model ages ranging from 724 Ma to 1018 Ma.Geochemical data show that Baiheshan quartz diorite is a set of I type calc-alkaline rocks.All the samples have rich alkali(Na2O+K2O=6.03%~6.96%)and sodium(Na2O/K2O>2), low values of Mg#(35.48~39.78)and low content of Ni(2.06×10-6~5.54×10-6)and Cr(2.11×10-6~7.93×10-6).Light rare earth elements(LREEs)are enriched in the chondrite-normalized REE patterns while heavy rare earth elements(HREEs)fractionation and negative Eu anomalies are not obvious.They are enriched in large ion lithophile elements such as Rb, K and U and depleted in high field strength elements(HFSEs)such as Nb, Ta, P and Ti.The geochemical composition indicates that the rock has the genetic characteristics of the subduction zone.The zircon U-Pb age and petrogenesis of the quartz diorite prove that it is the earliest arc magmatic record that was first discovered in the Late Paleozoic Baishan magmatic arc, which is clearly related to the subduction of the Hongshishan-Baiheshan Ocean.It is shown that the subduction of Hongshishan and Baiheshan Ocean occurred before ~350 Ma, which is 22 Ma earlier than the previous conclusion about the start of the ocean subduction.
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表 1 百合山石英闪长岩LA-ICP-MS锆石U-Th-Pb同位素测试结果
Table 1. U-Th-Pb isotopic composition of the zircons in Baiheshan quartz diorite measured by using LA-ICP-MS
测点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 16 248 235 1.05 0.0536 0.0009 0.4131 0.0074 0.0559 0.0006 354 36 351 6.3 351 3.6 2 9 109 147 0.74 0.0538 0.0014 0.4146 0.0112 0.0559 0.0006 361 58 352 9.5 351 3.6 3 23 314 359 0.87 0.0542 0.0008 0.4163 0.0068 0.0557 0.0006 378 33 353 5.7 350 3.6 4 7 60 111 0.54 0.0535 0.0033 0.4118 0.0260 0.0559 0.0006 349 139 350 22.1 350 3.9 5 15 170 243 0.70 0.0535 0.0009 0.4122 0.0075 0.0558 0.0006 352 37 350 6.4 350 3.6 6 8 94 130 0.72 0.0537 0.0014 0.4130 0.0117 0.0558 0.0006 358 60 351 10.0 350 3.6 7 7 83 119 0.69 0.0537 0.0016 0.4148 0.0126 0.0560 0.0006 359 66 352 10.7 351 3.8 8 24 405 355 1.14 0.0538 0.0009 0.4167 0.0074 0.0562 0.0005 363 37 354 6.3 352 3.4 9 15 207 242 0.85 0.0530 0.0009 0.4107 0.0077 0.0562 0.0006 329 40 349 6.5 352 3.8 10 13 151 207 0.73 0.0533 0.0011 0.4135 0.0090 0.0562 0.0006 343 47 351 7.6 353 3.7 11 9 84 159 0.53 0.0536 0.0013 0.4114 0.0110 0.0556 0.0006 356 57 350 9.3 349 3.7 12 11 103 184 0.56 0.0531 0.0011 0.4111 0.0087 0.0561 0.0006 335 45 350 7.4 352 3.6 13 27 206 384 0.54 0.0554 0.0009 0.5200 0.0084 0.0681 0.0007 429 34 425 6.9 424 4.4 14 16 201 264 0.76 0.0534 0.0009 0.4134 0.0078 0.0561 0.0006 346 38 351 6.7 352 3.8 15 17 246 280 0.88 0.0535 0.0008 0.4138 0.0070 0.0561 0.0006 348 35 352 5.9 352 3.8 16 14 154 238 0.65 0.0540 0.0011 0.4156 0.0099 0.0558 0.0007 373 47 353 8.4 350 4.2 17 14 166 232 0.72 0.0537 0.0010 0.4153 0.0081 0.0560 0.0006 360 40 353 6.9 352 3.8 18 14 173 242 0.72 0.0535 0.0010 0.4132 0.0086 0.0560 0.0006 352 44 351 7.3 351 3.8 19 11 128 185 0.69 0.0541 0.0011 0.4152 0.0089 0.0557 0.0006 374 44 353 7.5 349 3.8 20 22 286 369 0.78 0.0536 0.0008 0.4135 0.0065 0.0559 0.0006 354 32 351 5.5 351 3.6 21 15 158 259 0.61 0.0537 0.0008 0.4158 0.0072 0.0562 0.0006 359 36 353 6.1 352 3.5 22 18 217 296 0.73 0.0539 0.0008 0.4133 0.0070 0.0556 0.0006 367 34 351 5.9 349 3.8 23 20 246 335 0.73 0.0538 0.0008 0.4146 0.0068 0.0559 0.0006 362 33 352 5.7 351 3.5 24 9 111 161 0.69 0.0540 0.0018 0.4139 0.0138 0.0556 0.0006 372 74 352 11.8 349 3.5 
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表 3 百合山石英闪长岩锆石Lu-Hf同位素测试结果
Table 3. Zircon Lu-Hf isotopic compositions of Baiheshan quartz diorite
测点号 206Pb/238U
年龄/Ma176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ εHf(0) εHf(t) TDM/Ma TDMC/Ma fLu/Hf 1 351 0.0477 0.0020 0.282771 0.000018 -0.04 7.23 700 1120 -0.94 2 351 0.0239 0.0010 0.282764 0.000018 -0.28 7.19 692 1123 -0.97 3 350 0.0387 0.0016 0.282798 0.000018 0.92 8.26 654 1025 -0.95 4 350 0.0405 0.0017 0.282765 0.000020 -0.25 7.09 704 1135 -0.95 5 350 0.0402 0.0017 0.282820 0.000015 1.7 9.03 625 958 -0.95 6 350 0.0350 0.0014 0.282807 0.000017 1.24 8.65 639 995 -0.96 7 351 0.0494 0.0020 0.282734 0.000022 -1.34 5.92 755 1239 -0.94 8 352 0.0422 0.0017 0.282767 0.000019 -0.18 7.16 703 1130 -0.95 9 352 0.0377 0.0016 0.282791 0.000022 0.67 8.04 664 1047 -0.95 10 353 0.0427 0.0018 0.282845 0.000021 2.58 9.88 591 880 -0.94 11 349 0.0263 0.0011 0.282827 0.000016 1.95 9.42 605 923 -0.97 14 352 0.0316 0.0013 0.282712 0.000019 -2.12 5.28 773 1297 -0.96 15 352 0.0440 0.0018 0.282797 0.000017 0.88 8.19 660 1035 -0.94 16 350 0.0218 0.0009 0.282774 0.000017 0.07 7.58 677 1090 -0.97 18 351 0.0442 0.0018 0.282813 0.000018 1.45 8.75 637 983 -0.95 19 349 0.0463 0.0019 0.282742 0.000021 -1.06 6.24 741 1211 -0.94
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表 2 百合山石英闪长岩主量、微量和稀土元素测试结果
Table 2. Whole-rock major, trace element and REE data for Baiheshan quartz diorite
样品号 YQ1024-1-1 YQ1024-1-2 YQ1024-1-3 YQ1024-1-4 YQ1024-1-5 SiO2 65.77 64.37 66.3 65.93 65.02 TiO2 0.54 0.66 0.53 0.51 0.54 Al2O3 17.04 17.21 16.97 17.18 17.3 Fe2O3 1.95 1.98 1.87 1.67 2.08 FeO 1.43 2.05 1.43 1.48 1.38 MnO 0.076 0.086 0.085 0.08 0.09 MgO 1.01 1.42 1.01 0.92 1.05 CaO 4 4.81 4.08 4.26 4.5 Na2O 4.92 4.34 4.76 4.68 4.76 K2O 1.96 1.69 1.84 2.28 1.9 P2O5 0.15 0.19 0.14 0.14 0.2 烧失量 1.01 0.97 0.83 0.72 1.02 总计 99.86 99.78 99.85 99.85 99.84 A/NK 1.67 1.92 1.73 1.69 1.75 A/CNK 0.97 0.97 0.98 0.96 0.96 AR 1.97 1.75 1.91 1.96 1.88 Mg# 36.11 39.78 36.64 35.48 36.53 DI 73.27 67.2 72.69 73.02 71.03 SI 8.96 12.37 9.26 8.34 9.40 σ 2.08 1.70 1.87 2.11 2.01 La 19.6 19.5 17.9 17.1 22.4 Ce 47 46.7 40.5 42.2 50.9 Pr 5.04 5.53 4.68 4.39 5.47 Nd 20 22.5 18.6 17 21.4 Sm 4.34 5.11 4.13 3.91 4.54 Eu 1.29 1.41 1.22 1.26 1.36 Gd 4.26 4.76 4.03 3.8 4.32 Tb 0.77 0.84 0.75 0.7 0.77 Dy 4.76 4.98 4.63 4.32 4.57 Ho 0.97 1.00 0.96 0.91 0.93 Er 2.87 2.88 2.84 2.71 2.77 Tm 0.45 0.45 0.45 0.42 0.44 Yb 2.96 2.8 3 2.82 2.87 Lu 0.48 0.44 0.48 0.45 0.46 ΣREE 141 146 130 127 148 (La/Yb)N 4.75 5.00 4.28 4.35 5.60 (La/Sm)N 2.92 2.46 2.80 2.82 3.19 (Gd/Yb)N 1.19 1.41 1.11 1.11 1.25 δEu 0.91 0.86 0.90 0.99 0.93 Cr 2.11 7.93 2.6 2.44 6.31 Ni 2.12 5.54 2.2 2.06 3.6 Co 4.72 6.04 4.55 4.15 4.9 Rb 56.7 76.4 37.5 37.2 50.6 Cs 2.66 4.92 2.18 2.52 2.86 Sr 274 321 276 288 328 Ba 394 333 467 519 530 V 47.1 62.8 48.6 45.2 50.9 Sc 12.1 12.7 11.5 11.7 12.5 Nb 8.32 8.48 8.54 8.01 8.04 Ta 0.66 0.62 0.74 0.66 0.64 Zr 297 273 279 287 313 Hf 7.93 7.33 7.59 7.65 8.39 Ga 19.5 17.5 19.9 21.3 21.2 U 2.09 2.76 2.27 1.5 2.1 Th 8.72 8.9 9.48 8.14 9.08 Y 26.4 27 26.3 24.7 25.1 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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