Formation age, geochemical characteristics and geological significance of the Early Jurassic monzonitic granites in southern Xiao Hinggan Mountains
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摘要:
通过对小兴安岭南部二长花岗岩的LA-ICP-MS锆石U-Pb同位素定年和岩石地球化学分析，确定了其形成时代及岩石成因。测得二长花岗岩的同位素年龄为188±2Ma，形成于早侏罗世。地球化学特征显示其富硅、富碱，CaO、Fe203、TiO2、MnO、MgO和P2O5的含量较低，A/CNK=0.95~1.12，A/NK=1.17~1.32，属于准铝-弱过铝质、高钾钙碱性系列岩石；富集大离子亲石元素Rb、K和高场强元素Hf、Zr、Th，相对亏损大离子亲石元素Ba、Sr和高场强元素Nb、Ta、Ti和P；稀土元素总量（∑REE）较高，配分曲线分布型式为轻稀土元素（LREE）相对富集、重稀土元素（HREE）相对亏损的右倾型，表现出轻微的负Eu异常。元素地球化学特征表明，二长花岗岩显示出I型花岗岩特征。结合区域研究资料，小兴安岭南部早侏罗世二长花岗岩的形成应与古大平洋板块向欧亚大陆下的俯冲作用和蒙古-鄂霍茨克洋向额尔古纳地块之下的俯冲作用，即双向俯冲作用的弧后伸展环境相对应，其岩浆起源于下地壳物质的部分熔融。
Abstract:In this paper, the formation age and petrogenesis of the monzonitic granites were confirmed through LA-ICP-MS zircon U-Pb dating and geochemical analysis in southern Xiao Hinggan Mountains.It is found that the isotopic age of monzogranite is 188±2Ma, suggesting Early Jurassic. The geochemical characteristics show that Si and ALK are abundant, CaO, Fe2O3, TiO2, MnO, MgO and P2O5 are relatively poor, with A/CNK being 0.95~1.12 and A/NK being 1.17~1.32, implying aluminum-weakly peraluminous high potassium calc-alkaline series granites; They are enriched in large ion lithophile elements Rb, K and high field strength elements Hf, Zr, Th, and depleted in large ion lithophile elements Ba, Sr and high field strength elements Nb, Ta, Ti and P.The total rare earth elements (∑REE) are abundant, the distribution curve shows that the light rare earth elements are more abundant than the heavy rare earth elements and show right-inclined pattern, with weak negative Eu anomalies.The geochemical characteristics of elements indicate that the granites belong to I-type granites.Combined with regional research data, it is suggested that the Early Jurassic monzonitic granites in southern Xiao Hinggan Mountains were formed under an extensional environment similar to back-arc basin which might have been related to double-subductions of the Paleo-Pacific plate beneath the Eurasian continent and the Mongol-Okhotsk oceanic plate beneath the Ergima Massif, and the magmas originated from partial melting of lower crustal materials.
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图 2 二长花岗岩锆石阴极发光图像(D5335)
Figure 2. Zircon cathodoluminescences images of the monzonitic granites(D5335)
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图 3 二长花岗岩锆石U-Pb年龄谐和图(D5335)
Figure 3. Zircon U-Pb concordia diagram for the monzonitic granites(D5335)
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图 4 早侏罗世二长花岗岩岩石类型和岩石系列图解
Figure 4. Rock types and series diagrams of the Early Jurassic monzonitic granites
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图 5 二长花岗岩稀土元素球粒陨石标准化分布型式(a)和微量元素原始地幔标准化蛛网图(b)
Figure 5. Chondrite-normalized REE patterns(a) and primitive mantle-normalized trace element spider diagrams(b) for monzonitic granites
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图 6 二长花岗岩SiO2-Al2O3(a)和SiO2-P2O5(b)图解
Figure 6. SiO2-Al2O3(a) and SiO2-P2O5(b) discriminant diagrams of monzonitic granites
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图 7 二长花岗岩K2O-Na2O(a)、SiO2-Ce(b)、SiO2-Y(c)和SiO2-Zr(d)图解
Figure 7. K2O-Na2O(a), SiO2-Ce(b), SiO2-Y(c)and SiO2-Zr(d) discriminant diagrams of monzonitic granites
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图 9 二长花岗岩Rb/30-Hf-Ta×3(a)和R1-R2(b)判别图解
Figure 9. Rb/3-Hf-Ta×3(a) and R1-R2(b) discriminant diagrams of monzonitic granites
表 1 早侏罗世二长花岗岩LA-ICP-MS锆石U-Th-Pb定年数据(D5335)
Table 1 LA-ICP-MS zircon U-Th-Pb dating results for the Early Jurassic monzonitic granite(D5335)
分析序号 含量/10-6 同位素比值 年龄/Ma Pb U 206Pb/238U err/% 207Pb/235U err/% 207Pb/206Pb err/% 208Pb/232Th err/% 232Th/238U err/% 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 12 337 0.0304 1.2 0.208 2.8 0.0497 2.9 0.0082 2.5 0.903 0.05 193 2 192 5 179 65 2 18 569 0.0281 1.2 0.210 3.9 0.0540 3.9 0.0084 2.8 0.828 0.01 179 2 193 8 373 88 3 12 361 0.0293 1.1 0.205 4.5 0.0507 4.6 0.0080 2.3 0.900 0.03 186 2 189 9 229 106 4 6 191 0.0303 1.1 0.216 5.0 0.0518 4.9 0.0074 2.4 0.673 0.05 192 2 199 10 275 113 5 11 321 0.0299 1.1 0.206 3.1 0.0499 3.0 0.0070 2.1 1.18 0.11 190 2 190 6 191 70 6 9 256 0.0304 1.2 0.209 8.3 0.0500 8.3 0.0083 2.6 0.935 0.02 193 2 193 16 195 193 7 7 219 0.0297 1.1 0.210 4.5 0.0513 4.4 0.0068 2.8 0.500 0.15 189 2 194 9 252 101 8 6 214 0.0287 1.1 0.207 4.0 0.0522 4.0 0.0065 2.9 0.688 0.31 182 2 191 8 295 91 9 2 71 0.0300 1.3 0.212 10 0.0511 10 0.0077 3.4 0.876 0.01 191 2 195 20 246 233 10 11 337 0.0304 1.2 0.207 2.8 0.0493 2.8 0.0074 2.5 0.896 0.04 193 2 191 5 162 65 11 10 330 0.0294 1.1 0.206 2.9 0.0508 2.9 0.0066 2.3 0.707 0.02 187 2 190 6 233 66 12 8 255 0.0306 1.1 0.208 5.7 0.0494 5.6 0.0066 2.4 0.883 0.03 194 2 192 11 165 131 13 10 340 0.0298 1.1 0.205 2.9 0.0498 2.8 0.0059 2.2 0.639 0.01 189 2 189 5 185 66 14 11 340 0.0296 1.1 0.206 2.6 0.0506 2.6 0.0056 2.2 0.816 0.00 188 2 191 5 223 59 15 12 389 0.0297 1.1 0.202 2.6 0.0493 2.5 0.0055 2.5 0.913 0.03 189 2 187 5 162 59 16 7 206 0.0299 1.1 0.213 4.2 0.0516 4.1 0.0056 2.5 1.21 0.02 190 2 196 8 266 93 17 11 353 0.0288 1.1 0.204 2.7 0.0515 2.6 0.0052 2.2 0.833 0.02 183 2 189 5 265 61 18 12 413 0.0291 1.1 0.214 2.3 0.0533 2.3 0.0059 2.0 0.714 0.04 185 2 197 5 341 52 19 18 569 0.0282 1.2 0.211 3.9 0.0541 3.9 0.0073 2.4 0.817 0.01 179 2 194 8 377 88 20 10 320 0.0288 1.1 0.214 2.6 0.0537 2.5 0.0060 2.0 0.761 0.03 183 2 197 5 359 56 21 10 335 0.0287 1.1 0.213 2.7 0.0538 2.6 0.0061 2.1 0.944 0.08 182 2 196 5 364 58 22 10 308 0.0294 1.1 0.208 3.6 0.0512 3.5 0.0065 2.3 0.898 0.20 187 2 192 7 249 81 23 7 237 0.0292 1.1 0.215 3.8 0.0535 3.7 0.0066 2.5 0.636 0.12 185 2 198 7 348 84 24 7 237 0.0294 1.1 0.238 3.8 0.0587 3.7 0.0072 2.5 0.636 0.12 187 2 217 8 556 81 注：测试单位为天津地质矿产研究所测试中心 
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表 2 早侏罗世二长花岗岩主量、微量和稀土元素分析结果
Table 2 Major，trace elements and REE compositions for the Early Jurassic monzonitic granite
样品号 P1TC67 P1TC75 P3TC12 P3TC23 P7TC24 5335 5348 5352 SiO2 74.46 72.50 72.08 70.92 70.92 70.78 71.52 70.46 TiO2 0.27 0.31 0.29 0.37 0.43 0.42 0.37 0.49 Al2O3 13.11 13.76 13.94 14.28 13.85 14.17 14.20 13.72 Fe2O3 0.91 1.20 1.12 1.20 0.84 1.47 1.59 1.86 FeO 0.73 0.70 0.91 1.04 1.83 1.55 0.94 1.36 MnO 0.06 0.09 0.06 0.07 0.15 0.08 0.08 0.09 MgO 0.39 0.53 0.66 0.77 0.79 0.59 0.60 1.15 CaO 1.23 1.25 1.74 1.98 1.66 1.77 1.62 1.00 Na2O 3.58 4.31 4.13 4.54 3.82 4.10 4.13 3.75 K2O 4.15 4.28 3.83 3.66 4.07 3.74 4.11 3.92 P2O5 0.05 0.07 0.08 0.09 0.11 0.11 0.06 0.13 烧失量 0.36 0.28 0.36 0.46 0.76 0.38 0.64 1.34 总计 99.30 99.28 99.20 99.38 99.23 99.16 99.86 99.27 σ 1.90 2.50 2.18 2.41 2.23 2.21 2.38 2.14 SI 4.00 4.82 6.21 6.88 6.96 5.16 5.30 9.59 ALK 7.73 8.59 7.96 8.20 7.89 7.84 8.24 7.67 A/CNK 1.04 0.98 0.99 0.95 1.01 1.01 1.00 1.12 K/Na 1.16 0.99 0.93 0.81 1.07 0.91 1.00 1.05 A/MF 4.12 3.56 3.17 2.88 2.44 2.54 2.91 1.90 AR 3.34 3.68 3.06 3.03 3.07 2.94 3.17 3.18 La 34.20 35.70 30.60 28.10 33.70 43.40 39.10 38.60 Ce 70.00 69.10 55.60 53.00 61.80 93.80 79.90 77.30 Pr 7.84 7.91 5.83 6.05 6.55 9.26 9.10 7.86 Nd 27.80 27.60 19.20 21.20 22.50 31.90 32.00 27.30 Sm 4.89 4.85 3.14 3.54 3.69 5.42 5.79 4.52 Eu 0.97 1.07 0.77 0.89 0.93 1.00 1.13 1.06 Gd 4.30 4.18 2.81 3.07 3.23 4.89 5.10 3.95 Tb 0.69 0.66 0.42 0.46 0.48 0.74 0.83 0.58 Dy 4.10 3.85 2.31 2.55 2.60 4.28 4.94 3.13 Ho 0.82 0.79 0.49 0.52 0.53 0.89 1.05 0.64 Er 2.56 2.37 1.53 1.62 1.62 2.74 3.26 1.92 Tm 0.40 0.39 0.26 0.26 0.26 0.46 0.55 0.32 Yb 2.75 2.64 1.81 1.88 1.83 3.33 3.99 2.28 Lu 0.42 0.41 0.31 0.29 0.29 0.50 0.64 0.42 Y 22.50 21.70 14.40 14.50 15.10 26.10 29.60 17.30 ∑REE 161.74 161.52 125.08 123.43 140.01 202.61 187.38 169.88 LREE/HREE 9.08 9.56 11.58 10.59 11.92 10.36 8.20 11.83 (La/Yb)N 8.38 9.12 11.40 10.08 12.42 8.79 6.61 11.41 (La/Sm)N 6.99 7.36 9.75 7.94 9.13 8.01 6.75 8.54 δCe 0.99 0.95 0.94 0.94 0.94 1.08 0.99 1.01 δEu 0.63 0.71 0.78 0.81 0.81 0.58 0.62 0.75 Sr 214 187 262 318 330 291 236 230 Rb 123 132 119 114 125 125 126 127 Ba 500 735 711 817 664 573 668 553 Th 11.6 11.1 10.5 8.21 9.99 21.3 16 18.6 Nb 13.3 14.2 11.9 11.7 13.2 18.7 22.7 18.5 Zr 82 131 106 114 138 201 113 132 Ta 1.33 1.03 1.08 1.00 0.98 2.00 2.08 1.52 Hf 3.20 5.10 3.40 5.10 4.30 5.70 4.40 4.10 Sc 2.11 3.24 3.01 3.02 3.06 4.01 4.18 6.99 Ti 1719 1812 1928 2397 2631 2718 2377 3160 Zr/Hf 25.63 25.69 31.18 22.35 32.09 35.26 25.68 32.20 Rb/Sr 0.57 0.71 0.45 0.36 0.38 0.43 0.53 0.55 注：测定单位为自然资源部哈尔滨矿产资源监督检测中心。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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