Ages, origin and geological implications of Early Cretaceous granite porphyry in Hegen Mountain, Inner Mongolia
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摘要:
贺根山花岗斑岩位于华北板块和西伯利亚板块结合部位，锆石206Pb/238U年龄加权平均值为137.6±1.6Ma，为早白垩世岩浆活动的产物。地球化学特征表现为主量元素总体富硅，且有较高的分异指数（DI）及碱/铝（NK/A）、Fe2O/FeO值，较低的TFe、Ti、Mg、Ca和P含量；微量元素蛛网图则表现为富集大离子亲石元素Rb、Th、U，弱富集轻稀土元素La，Ce，明显亏损高场强元素Nb、Ba和Sr、Ti。稀土元素配分图表现为相对富集轻稀土元素、亏损重稀土元素，轻、重稀土元素分异较大、重稀土元素曲线较平坦的右倾型特征。综合分析认为，贺根山花岗斑岩属于高分异弱过铝质高钾钙碱性系列的Ⅰ型花岗岩，其源区物质可能为来自高钾、正常水含量的长英质陆壳岩石物质。花岗斑岩成因可能是晚古生代末-中生代初古亚洲洋闭合引起的一系列板块碰撞作用（包括蒙古-鄂霍次克洋闭合），使造山后期地壳逐渐增厚并发生重力垮塌，导致构造环境由挤压转变为伸展，同时受古太平洋板块西向俯冲影响的结果。
Abstract:Zircon U-Pb age of granite-porphyry in Hegen Mountain located in the conjunction of the North China plate and the Siberia plate is 137.6±1.6Ma, suggesting that the rockswere formed by magmatic evolution during Early Cretaceous. The geochemical data indicate that major elements are characterized by enrichment of Si, higher DI and NK/A as well as Fe2O/FeO ratios. The trace element spider diagram indicates that graniteporphyry is relatively rich in Rb, Th, U, slightly enriched in light rare earth elements La, Ce, and depleted in high field strength elements such as Nb, Ba, Sr and Ti, while the distribution model of REE is right oblique, exhibiting relative LREE-enrichment and HREE-depletion, and the HREE curve is flat. These results suggest that the granite porphyry is attributed to high differentiated metaluminous-weakly peraluminous high calc-alkaline series, being typical Ⅰ-type granite. The source materials might have come from crustal felsic rocks with high K and normal water content. The formation of the granite porphyry may be related to the process from the extrusion to extension resulting from the lithosphere thinning after plates collision (including Mongolia-Okhotsk Ocean) with the closure of Paleo-Asian Ocean during the Late Paleozoic to the Early Mesozoic. It was also affected by the westward subduetion of the Paleo-Pacific Ocean.
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Key words:
- granite porphyry /
- zircon U-Pb age /
- geochemical characteristics /
- tectonic background /
- Hegen Mountain
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表 1 贺根山地区花岗斑岩LA-ICP-MS锆石U-Th-Pb测年数据
Table 1. LA-ICP-MS U-Th-Pb data of the zircons from granite porphyry in Hegen Mountain
测试点号
U.PB.2671含量/10-6 同位素比值 年龄/Ma Pb U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 232Th/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 13 532 0.0215 0.0002 0.154 0.006 0.0516 0.0019 0.0074 0.0001 0.738 0.010 137 1 145 5 269 84 2 5 232 0.0221 0.0003 0.161 0.011 0.0525 0.0037 0.0085 0.0003 0.416 0.003 141 2 151 11 307 161 3 8 331 0.0212 0.0002 0.149 0.009 0.0510 0.0029 0.0090 0.0002 0.536 0.006 135 1 141 8 241 131 4 6 246 0.0218 0.0002 0.157 0.010 0.0521 0.0033 0.0076 0.0002 0.540 0.012 139 1 148 10 291 146 5 6 275 0.0213 0.0002 0.151 0.009 0.0515 0.0029 0.0080 0.0001 0.581 0.007 136 1 143 8 264 131 6 8 305 0.0213 0.0002 0.147 0.009 0.0496 0.0029 0.0064 0.0001 1.020 0.009 136 1 139 8 178 136 7 11 527 0.0210 0.0002 0.153 0.005 0.0528 0.0018 0.0071 0.0001 0.436 0.008 134 1 144 5 319 77 8 10 442 0.0217 0.0002 0.153 0.005 0.0512 0.0015 0.0075 0.0001 0.356 0.003 138 2 145 4 251 68 9 8 349 0.0212 0.0002 0.156 0.007 0.0533 0.0022 0.0066 0.0001 0.529 0.007 135 1 147 6 341 95 10 8 367 0.0214 0.0002 0.157 0.006 0.0533 0.0019 0.0072 0.0002 0.356 0.002 136 1 148 5 342 82 11 8 349 0.0207 0.0003 0.280 0.010 0.0975 0.0032 0.0123 0.0004 0.382 0.004 132 2 251 9 1577 61 12 5 224 0.0225 0.0004 0.155 0.010 0.0501 0.0033 0.0106 0.0005 0.251 0.006 144 2 147 10 198 154 13 7 286 0.0223 0.0002 0.151 0.001 0.0492 0.0031 0.0118 0.0004 0.409 0.016 142 1 143 9 159 145 14 7 275 0.0216 0.0002 0.157 0.009 0.0526 0.0029 0.0075 0.0001 0.768 0.005 138 1 148 8 310 127 15 8 319 0.0221 0.0002 0.157 0.007 0.0514 0.0023 0.0092 0.0002 0.549 0.008 141 1 148 7 261 104 16 6 253 0.0213 0.0002 0.159 0.009 0.0541 0.0030 0.0082 0.0003 0.342 0.003 136 2 150 9 374 126 17 6 257 0.0229 0.0003 0.160 0.012 0.0503 0.0037 0.0057 0.0002 0.574 0.004 146 2 151 11 211 171 注：测试单位为天津地质矿产研究所 
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表 2 贺根山花岗斑岩元素分析结果
Table 2. Element analysis results of Hegen Mountain granite porphyry
元素 样品号 P1-13 P1-16 P1-2 P1-4 SiO2 74.39 73.71 74.66 73.99 TiO2 0.13 0.17 0.18 0.14 Al2O3 13.86 13.95 13.38 13.95 Fe2O3 0.61 0.68 0.45 1.11 FeO 0.77 1 0.7 0.8 MnO 0.04 0.04 0.05 0.05 MgO 0.16 0.24 0.24 0.19 CaO 0.77 0.92 0.48 0.76 Na2O 3.83 3.82 3.82 3.93 K2O 4.43 4.69 4.53 4.13 P2O5 0.06 0.05 0.05 0.08 H2O+ 0.72 0.53 1.18 0.69 H2O- 0.68 0.55 0.91 0.86 CO2 0.06 0.06 0.13 0.06 烧失量 0.71 0.47 1.24 0.57 总计 101.22 100.88 102 101.31 Mg# 20.28 23.8 31.3 18.14 La 21.96 23.47 22.52 17.12 Ce 39.76 44.7 46.03 33.59 Pr 5.1 5.33 5.06 4.24 Nd 18.75 19.22 18.44 15.55 Sm 4.48 4.11 4.17 3.9 Eu 0.46 0.59 0.55 0.44 Gd 4.39 3.74 3.82 3.76 Tb 0.91 0.72 0.68 0.79 Dy 5.22 3.93 3.68 4.7 Ho 0.99 0.74 0.68 0.91 Er 2.9 2.06 1.96 2.64 Tm 0.45 0.32 0.31 0.41 Yb 3.09 2.09 2 2.86 Lu 0.43 0.29 0.29 0.4 Y 30.26 23.87 19.96 26.98 Rb 297.35 231.9 223.25 262.87 Sr 45.9 68.6 61.5 41.1 Ba 147.7 291.4 386.4 162.3 Nb 15.07 11.89 11.92 15.86 Ta 2.12 1.51 1.5 2.09 Zr 143.7 155.4 149.4 152 Hf 6.88 6.81 6.7 7.48 Th 14.95 12.91 11.65 13.55 V 6.2 9.6 7.6 5.9 Cr 7.6 7.6 7.2 8.2 Co 1.8 1.9 1.5 1.2 Ni 3.1 2.1 3.7 2.1 Sc 2.75 2.03 1.99 1.9 U 2.38 2.58 2.77 2.24 LREE 90.51 97.42 96.77 74.84 HREE 18.38 13.89 13.42 16.47 ∑REE 108.89 111.31 110.19 91.31 LREE/HREE 4.92 7.01 7.21 4.54 Eu* 0.32 0.46 0.42 0.35 Ce* 0.92 0.98 1.06 0.97 (La/Yb)N 5.1 8.06 8.08 4.29 (Ce/Yb)N 3.57 5.94 6.39 3.26 注：主量元素含量单位为%, 稀土和微量元素含量单位为10-6
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