Geochronology and geochemistry of granites in Linhai forest farm, northern Xiaoxinganling Mountains: Tectonic implication
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摘要:
小兴安岭-张广才岭林海林场地区发育一套高分异Ⅰ型花岗岩, 主要由边缘相细粒二长花岗岩和中心相细中粒二长花岗岩组成.岩石高Si和全碱(Na2O+K2O), 富Al, 贫Fe、Mg、Ca、Ti, 属于准铝质、高钾钙碱性系列岩石, 并且富集大离子亲石元素(LILE)、轻稀土元素(LREE), 亏损高场强元素(HFSE), 具中等强度Eu负异常.花岗岩的LA-ICP-MS锆石U-Pb年龄表明其形成于191.6±2.9 Ma.根据地球化学组成认为, 花岗岩主要起源于早中生代浅源陆壳物质的部分熔融.高分异Ⅰ型花岗岩的发现表明, 区内早侏罗世发生过规模较大的岩浆侵入活动, 可能与古太平洋板块西向俯冲背景下的区域伸展环境密切相关.
Abstract:A series of highly fractionated Ⅰ-type granites, mainly composed of marginal facies fine-grained monzogranite and central facies fine-medium-grained monzogranite, is developed in Linhai forest farm area of the Xiaoxinganling-Zhangguangcailing mountains. The granites are characterized by high Si and total alkali (Na2O+K2O), rich Al, and poor Fe, Mg, Ca and Ti, belonging to quasi-aluminous, high-K calc-alkaline series, with enriched LILEs and LREEs, depleted HFSEs, and moderately strong negative Eu anomaly. The LA-ICP-MS zircon U-Pb age results show that the granites were formed at 191.6±2.9 Ma. According to the geochemical compositions, it is considered that the granites are mainly derived from the partial melting of shallow continental crust materials in Early Mesozoic. The discovery of highly fractionated Ⅰ-type granites indicates that large-scale magmatic intrusion occurred in the Early Jurassic, which may be closely related to the regional extensional environment under the westward subduction of paleo-Pacific plate.
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Key words:
- Early Jurassic /
- granite /
- geochronology /
- geochemistry /
- tectonic setting /
- Xiaoxinganling /
- Zhangguangcailing
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表 1 花岗岩主量元素和微量元素分析结果
Table 1. Contents of major and trace elements in granite
样品号 PM04-26 PM04-27 PM04-28 PM04-29 样品号 PM04-26 PM04-27 PM04-28 PM04-29 SiO2 76.230 73.970 68.170 74.670 Zr 113 196 51.4 82.6 TiO2 0.081 0.087 0.420 0.110 Hf 4.41 5.89 1.72 2.83 Al2O3 12.560 13.830 14.410 12.410 Sm 2.1 6.21 1.12 3.44 Fe2O3 0.310 0.320 3.020 1.390 Y 18.8 33.5 3.56 14.2 FeO 0.520 0.630 1.430 0.550 Yb 2.87 4 0.483 1.72 MnO 0.074 0.061 0.084 0.051 Lu 0.419 0.56 0.059 0.254 MgO 0.170 0.130 0.140 0.120 La 14.5 38.5 17.1 30.2 CaO 0.580 0.820 0.790 0.470 Ce 40.4 113 24.8 53.9 Na2O 3.490 3.710 4.060 3.090 Pr 3.03 8.52 2.41 6.08 K2O 5.750 6.180 6.920 6.610 Nd 10.7 31.4 7.91 21.4 P2O5 0.020 0.021 0.041 0.025 Sm 2.1 6.21 1.12 3.44 LOI 0.170 0.170 0.360 0.450 Eu 0.174 0.99 0.159 0.743 ∑ 99.955 99.929 99.845 99.946 Gd 1.85 5.34 0.859 2.71 Na2O+K2O 9.260 9.914 11.037 9.749 Tb 0.394 1.11 0.144 0.502 A/CNK 0.963 0.967 0.922 0.946 Dy 2.79 5.86 0.609 2.33 DI 96.130 95.530 92.090 95.990 Ho 0.591 1.18 0.111 0.45 A/NK 1.048 1.080 1.016 1.013 Er 1.98 3.47 0.307 1.28 R1 2472.000 2150.000 1361.000 2289.000 Tm 0.404 0.58 0.047 0.233 R2 318.000 359.000 376.000 301.000 Yb 2.87 4 0.483 1.72 Rb 168 191 228 154 Lu 0.419 0.56 0.059 0.254 Ba 174 762 376 583 Y 18.8 33.5 3.56 14.2 Th 19 24.9 3.6 21 ∑REE 82.202 220.72 56.12 125.24 U 4.02 8.66 0.775 5.66 LREE 70.9 198.62 53.5 115.76 Ta 0.933 0.875 0.547 1.09 HREE 11.3 22.1 2.62 9.48 Nb 15 14 9.69 12.3 LREE/HREE 6.28 8.99 20.43 12.21 La 14.5 38.5 17.1 30.2 LaN/YbN 3.62 6.9 25.4 12.59 Ce 40.4 113 24.8 53.9 δEu 0.26 0.51 0.48 0.72 Sr 23.8 96.7 31.6 223 δCe 1.42 1.46 0.83 0.92 含量单位: 主量元素为%, 微量元素为10-6. 
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表 2 花岗岩同位素分析结果
Table 2. Isotopic analysis results of granite
样品点 同位素比值 锆石年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 0.0526 0.002 0.22 0.01 0.0303 0.0004 0.0159 0.0007 202 9 193 3 2 0.0551 0.003 0.2244 0.0149 0.0295 0.0007 0.0142 0.0015 205 14 187 5 3 0.0494 0.0034 0.2056 0.0166 0.0302 0.0008 0.0138 0.0021 190 15 192 5 4 0.0508 0.0036 0.219 0.0162 0.0313 0.0002 0.0163 0.0014 201 15 199 1 5 0.0579 0.0032 0.2056 0.0138 0.0258 0.0007 0.0112 0.0007 190 13 164 4 6 0.0447 0.0025 0.1949 0.012 0.0316 0.0003 0.0144 0.0007 181 11 201 2 7 0.0563 0.0032 0.1972 0.0126 0.0254 0.0003 0.0086 0.0004 183 12 162 2 8 0.0504 0.005 0.2089 0.0225 0.0301 0.0004 0.0135 0.0013 193 21 191 3 9 0.05 0.0027 0.2109 0.0141 0.0306 0.0011 0.0137 0.0013 194 13 194 7 10 0.0479 0.0022 0.195 0.0109 0.0295 0.0009 0.0128 0.0009 181 10 187 5 11 0.0527 0.0026 0.2122 0.0111 0.0292 0.0001 0.0103 0.0004 195 10 186 1 12 0.0509 0.0025 0.207 0.0109 0.0295 0.0002 0.0103 0.0002 191 10 187 1 13 0.0545 0.001 0.223 0.005 0.0297 0.0004 0.0104 0.0004 204 5 189 3 14 0.0516 0.0041 0.212 0.0186 0.0298 0.0005 0.0121 0.0011 195 17 189 3 15 0.0655 0.0032 0.1795 0.0103 0.0199 0.0004 0.0089 0.0004 168 10 127 2 16 0.0495 0.0021 0.1976 0.0102 0.0289 0.0007 0.0128 0.0007 183 9 184 5 17 0.0515 0.0016 0.2131 0.0077 0.03 0.0003 0.0119 0.0003 196 7 191 2 18 0.0507 0.0018 0.2219 0.01 0.0317 0.0007 0.0123 0.0003 203 9 201 5 19 0.0522 0.0022 0.2273 0.0108 0.0316 0.0003 0.012 0.0003 208 10 200 2 20 0.0555 0.003 0.2303 0.0129 0.0301 0.0001 0.0127 0.0003 211 12 191 1
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