Response of the North China Craton to the Rodinia supercontinent breakup: New evidence from petrochemistry, chronology and Hf isotope of the gabbro in Xiaosongshan area of northern Helan Moun-tain
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摘要:
华北克拉通西缘贺兰山北段小松山地区辉长岩锆石U-Pb年代学、岩石地球化学和锆石Hf同位素的研究结果表明，辉长岩的侵位结晶年龄为835.5±5.3Ma，即形成于新元古代早期，属于板内拉斑玄武岩系列岩石，总体上略富集轻稀土元素、大离子亲石元素Rb、Ba、La，略亏损高场强元素Th、Nb、Zr、Hf等；具有较高的εHf（t）值（5.83~7.87），其单阶段模式年龄tDM1为1075~1155Ma，两阶段模式年龄tDM2为1176~1289Ma。综合研究发现，辉长岩的原始岩浆起源于中元古代富集型地幔，形成于华北陆块西缘的板内伸展环境，说明华北陆块响应了Rodinia超大陆裂解，也是Rodinia超大陆的一部分。
Abstract:Zircon LA-ICP-MS U-Pb dating, petrochemistry and zircon Hf isotope study of the gabbros from Xiaoshongshan area of the North Helanshan show that the emplacement crystallization age is 835.5±5.3Ma, suggesting early Neoproterozoic. The gab-bros belong to intraplate tholeiite basalt series, and are slightly rich in LREE, rich in Rb, Ba, La, and slightly depleted in HFSE, Th, Nb, Ta, Zr and Hf; Hf isotopic data of the gabbros show high εHf(t) values (5.83~7.87), the single stage model age tDM1 is 1075~1155Ma, and the two stage model age tDM2 is 1176~1289Ma. Comprehensive studies suggest that the magma of gabbros originated from an enriched mantle in the Mesoproterozoic, and was formed in an intraplate extension setting on the western margin of the North China continental blocks. The authors thus infer that this magma event was a response of the North China continental blocks to the breakup of the Rodinia supercontinent. Therefore, it was also a part of the supercontinent.
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Key words:
- gabbros /
- zircon U-Pb age /
- element geochemistry /
- Hf isotope /
- breakup of Rodinia /
- North China Craton /
- Neoproterozoic
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表 1 小松山地区辉长岩主量、微量和稀土元素组成
Table 1. Major, trace elements and REE analyses of the gabbro from Xiaosongshan area
元素名称 HL-29-1 HL-29-2 HL-39-1 HL-39-2 元素名称 HL-29-1 HL-29-2 HL-39-1 HL-39-2 SiO2 47.93 47.57 46.02 46.48 Rb 27.62 24.7 37.26 54.8 TiO2 1.05 0.99 0.97 0.99 Sr 812.6 1007 305.1 393 Al2O3 17.16 16.45 17.87 14.35 Y 10.09 11.4 10.11 10.8 TFe2O3 6.33 5.74 4.81 5.71 Zr 48.03 44.0 44.12 52.6 MnO 0.1 0.1 0.07 0.09 Nb 4.553 5.25 1.889 4.53 MgO 6.36 6.37 6.63 8.34 Cs 0.668 0.61 0.261 0.41 CaO 14.05 14.83 17.21 18.16 Ba 212.6 177 520.2 598 Na2O 2.13 1.95 0.27 0.26 La 6.59 7.07 4.04 5.34 K2O 0.98 1.01 2.46 1.78 Ce 16.23 17.0 11.19 13.2 P2O5 0.09 0.08 0.06 0.03 Pr 2.381 2.34 1.874 1.94 烧失量 2.88 2.82 2.75 2.36 Nd 10.9 11.2 9.237 9.27 总计 99.06 97.91 99.12 98.55 Sm 2.737 2.58 2.554 2.48 Na2O+K2O 3.11 2.96 2.73 2.04 Eu 1.158 1.22 0.947 1.02 K2O/Na2O 0.460 0.518 9.111 6.846 Gd 2.894 2.66 2.844 2.54 Mg# 69 71 75 76 Tb 0.414 0.40 0.427 0.38 Sc 31.33 34.8 24.39 24.9 Dy 2.309 2.36 2.292 2.14 Ti 5830.3 5812.8 5712.9 5710.4 Ho 0.421 0.44 0.43 0.41 V 289.2 285 276.7 271 Er 1.033 1.08 1.033 1.03 Cr 304.1 271 37.15 28.4 Tm 0.15 0.14 0.145 0.13 Mn 849.9 845.5 720.6 715 Yb 0.795 0.82 0.844 0.83 Co 31.84 57.5 41.65 36.9 Lu 0.119 0.11 0.125 0.11 Ni 80.32 97.6 75.19 55.5 Hf 1.408 1.29 1.541 1.59 Cu 29.31 37.5 127.4 120 Ta 0.361 0.62 0.185 0.38 Zn 45.18 39.6 36.45 27.8 Pb 1.954 1.41 35.05 3.01 Ga 16.04 17.9 13.83 17.9 Th 0.657 0.65 0.312 0.46 Ge 1.497 1.45 1.56 1.52 U 0.151 0.16 0.092 0.12 注:Mg#=(Mg/40.304)/(Fe2OT3/71.844*0.8998*0.9+Mg/40.304)*100;主量元素含量单位为%，微量和稀土元素为10-6 
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表 2 小松山地区辉长岩LA-ICP-MS锆石U-Th-Pb分析数据
Table 2. LA-ICP-MS zircon U-Th-Pb data of the gabbro from Xiaosongshan area
测点号 232Th/10-6 238U/10-6 232Th/238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/206Pb/Ma 207Pb/235U/Ma 206Pb/238U/Ma 208Pb/232Th/Ma HL39-1 52 86 0.60 0.070 0.004 1.37 0.065 0.1384 0.002 0.04093 0.001 938±72 862±28 836±14 811±29 HL39-2 83 129 0.65 0.068 0.003 1.30 0.061 0.1383 0.002 0.04247 0.001 863±77 845±27 835±10 841±25 HL39-3 57 96 0.59 0.069 0.003 1.31 0.064 0.1379 0.002 0.04142 0.001 893±77 851±28 833±11 820±28 HL39-4 47 96 0.48 0.066 0.003 1.26 0.057 0.1383 0.002 0.04104 0.002 799±71 829±26 835±11 813±29 HL39-5 66 128 0.52 0.064 0.003 1.23 0.053 0.1383 0.002 0.04381 0.002 749±68 815±24 835±11 866±31 HL39-6 52 86 0.61 0.065 0.004 1.24 0.071 0.1389 0.002 0.04202 0.002 784±96 820±32 838±12 832±30 HL39-7 35 60 0.58 0.066 0.004 1.25 0.073 0.1390 0.002 0.04617 0.002 814±93 824±33 839±14 912±36 HL39-8 60 92 0.65 0.067 0.003 1.27 0.060 0.1375 0.002 0.04312 0.002 837±75 834±27 831±11 853±32 HL39-9 87 176 0.49 0.070 0.003 1.34 0.049 0.1386 0.002 0.04306 0.001 924±54 864±21 837±10 852±29 HL39-10 33.0 67 0.49 0.067 0.004 1.27 0.082 0.1379 0.002 0.04201 0.002 840±107 833±37 833±13 832±42 HL39-11 29.9 69 0.43 0.071 0.004 1.35 0.073 0.1379 0.002 0.04262 0.002 953±84 869±32 833±13 844±43 HL39-12 38 66 0.57 0.071 0.004 1.34 0.075 0.1382 0.003 0.04408 0.002 966±81 865±3 834±16 872±41 HL39-13 59 89 0.67 0.065 0.003 1.28 0.056 0.1384 0.002 0.03951 0.001 780±71 809±26 835±12 783±26 HL39-14 25.9 50 0.51 0.069 0.004 1.30 0.076 0.1391 0.003 0.04644 0.002 898±86 845±33 840±16 917±43 HL39-15 47 96 0.49 0.069 0.004 1.33 0.067 0.1386 0.002 0.04214 0.002 911±78 858±29 837±2 834±37 HL39-16 38 72 0.52 0.070 0.004 1.32 0.067 0.1386 0.002 0.04146 0.002 940±76 856±29 836±13 821±36 HL39-17 20.0 44 0.45 0.073 0.005 1.36 0.085 0.1391 0.003 0.04391 0.002 1024±93 873±37 839±16 869±45 HL39-18 113 182 0.62 0.069 0.002 1.32 0.046 0.1385 0.002 0.03937 0.001 894±51 852±20 836±10 780±23 HL39-19 28.8 77 0.38 0.067 0.003 1.29 0.067 0.1387 0.002 0.04298 0.002 834±81 840±30 837±12 851±39 HL39-20 32.0 58 0.55 0.070 0.004 1.32 0.069 0.1382 0.002 0.04174 0.002 919±83 853+30 835±12 826±38
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表 3 小松山地区辉长岩锆石Hf同位素组成
Table 3. Zircon Hf isotopic composition of the gabbro from Xiaosongshan area
样品测点号 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ εHf(0) εHf(t) tDM1 tDM2 HL39-01 0.282450 0.000010 0.000709 0.000002 0.034272 0.000238 -11.38 6.69 1124 1241 HL39-02 0.282447 0.000009 0.000615 0.000000 0.030014 0.000239 -11.50 6.61 1126 1246 HL39-03 0.282431 0.000009 0.000440 0.000007 0.020664 0.000224 -12.05 6.17 1142 1270 HL39-04 0.282426 0.000011 0.000331 0.000004 0.015585 0.000125 -12.25 6.03 1147 1278 HL39-05 0.282439 0.000009 0.000524 0.000002 0.026297 0.000296 -11.78 6.38 1135 1258 HL39-06 0.282478 0.000010 0.000348 0.000006 0.017540 0.000433 -10.40 7.87 1075 1176 HL39-07 0.282456 0.000011 0.000581 0.000001 0.030586 0.000154 -11.18 6.96 1113 1227 HL39-08 0.282458 0.000010 0.000435 0.000003 0.019118 0.000270 -11.11 7.11 1106 1218 HL39-09 0.282428 0.000010 0.000299 0.000002 0.015063 0.000206 -12.17 6.12 1143 1273 HL39-10 0.282437 0.000010 0.000360 0.000001 0.016955 0.000087 -11.84 6.42 1132 1257 HL39-11 0.282427 0.000011 0.000278 0.000004 0.012570 0.000168 -12.20 6.10 1144 1274 HL39-12 0.282421 0.000009 0.000361 0.000005 0.016913 0.000369 -12.43 5.83 1155 1289 HL39-13 0.282467 0.000011 0.000553 0.000002 0.026382 0.000133 -10.77 7.38 1096 1203 HL39-14 0.282431 0.000010 0.000355 0.000001 0.016683 0.000147 -12.07 6.19 1141 1269 HL39-15 0.282434 0.000009 0.000293 0.000002 0.013357 0.000060 -11.94 6.36 1134 1260 注:表中锆石Hf同位素组成的计算参数为:176Lu衰变常数λ=l.865×l0-11a-1; 球粒陨石和亏损地幔的176Lu/177Hf、176Hf/177Hf分别为0.0332、0.282772与0.0384、0.28325;铁镁质下地壳的fLu/Hf=0.34;tDM1、tDM2单位为Ma; t为锆石的形成年龄(t=835Ma)
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① 宁夏回族自治区地质环境监测总站. 1: 25万吉兰泰幅区域地质调查报告. 2008.
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