Petrogenesis for the Yujingshan Pluton in Lushan Area, and Its Constraints on Tectonic Regime Transformation
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摘要: 对庐山核部的玉京山二长花岗岩开展了系统性分析.结果显示该岩体形成于125±1 Ma，其锆石εHf（t）值为-6.5~-2.0，二阶段模式年龄为1.6~1.3 Ga，表明岩浆源于中元古代地壳的部分熔融.岩体属过铝质高钾钙碱性花岗岩（A/CNK=1.10~1.15；K2O/Na2O=1.01~1.45），稀土总量较低（48.54×10-6~80.32×10-6），轻重稀土元素分馏不明显（（La/Yb）N=2.91~4.32），具Eu负异常（σEu=0.19~0.28），富集Rb、Sr、Th、U、K，亏损Nb、Ti.岩体εNd（t=125）值为-10.1~-8.9，指示出它们来源于古老地壳物质的重熔.综上所述，岩石形成过程中经历了结晶分异，属高分异S型花岗岩.岩体形成于早白垩世古太平洋板块北西向俯冲时，陆壳从挤压向伸展的构造转换阶段，随后于晚白垩世遭受了糜棱岩化.结合区域资料，表明华南板块构造体制转换发生于晚中生代，区域伸展作用可持续至早白垩世晚期.Abstract: In this paper, systematic analysis of the Yujingshan monzogranite is conducted to investigate its petrogenesis and source. The results show that the crystallization age of the monzogranite is 125 ± 1 Ma. The εHf (t) values of zircons are between -6.5 and -2.0 and the two-stage model ages (tDM2(Hf)) are 1.6-1.3 Ga, which suggests that the magma was derived by partial melting of Mesoproterozoic crust. Geochemically, the Yujingshan pluton belongs to peraluminous and high K calc-alkaline series with A/CNK=1.10-1.15 and K2O/Na2O=1.01-1.45. The ΣREE of the Yujingshan pluton is relatively low (ΣREE=48.54×10-6~80.32×10-6). LREE and HREE fractionation is not significant ((La/Yb)N=2.91-4.32), but there is a negative Eu anomaly (σEu=0.19-0.28). The samples are enriched with large ion lithophilic elements (Rb, Sr, Th, U, K) and depleted in high field strength elements (Nb and Ti). The enriched Sm-Nd isotopic composition [εNd(t=125) of -10.1 to -8.9] indicates that the magma originated from remelting of ancient crustal materials. Comprehensive analysis shows that the Yujingshan monzogranite was generated by the partial melting of Mesoproterozoic argillaceous rocks and experienced fractional crystallization. The magma belongs to highly differentiated S-type granites, which formed in a tectonic regime transformation process going from compression to extension during the northwest subduction of the paleo-Pacific plate. Subsequently, ductile shearing occurred during the Late Cretaceous, resulting in mylonitization of the Yujingshan pluton. This research, combined with regional magmatic and structural geology data, suggests that the tectonic regime transformation in the South China block occurred at Late Mesozoic, and that regional extension continued until the late Early Cretaceous.
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Key words:
- monzogranite /
- zircon U-Pb age /
- Nd-Hf isotopes /
- Lushan /
- geochemistry /
- petrology
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图 1 庐山地区地质构造略图(据项新葵等, 1993)
Fig. 1. Schematic geological map showing the main tectonic units of the Lushan region (after Xiang et al., 1993)
图 2 玉京山糜棱岩化二长花岗岩宏、微观特征
a.岩体内部长石受剪切形成的透镜体；b.片理面上发育的矿物拉伸线理（S，片理；La，拉伸线理）；c.顺片理走向的剪切形成的S⁃C组构（俯拍）；d.斜长石受剪切形成旋转碎斑；e.矿物集合体在剪切过程中形成旋转碎斑；f.云母受剪切形成云母鱼；Q.石英；Pl.斜长石；Mus.白云母；Kfs.钾长石
Fig. 2. Macro⁃ and micrographs of samples from the Yujingshan mylonitized monzogranite
图 3 玉京山糜棱岩化二长花岗岩代表性锆石的CL图像及锆石U⁃Pb谐和图(a)和加权平均年龄(b)
Fig. 3. CL images, U⁃Pb concordia diagrams (a) and weighted average age (b) of representative zircons from the Yujingshan mylonitized monzogranite
图 4 玉京山糜棱岩化二长花岗岩(JX34⁃0)锆石Lu⁃Hf同位素分析结果
Fig. 4. Lu⁃Hf isotopic results for zircons from the Yujingshan mylonitized monzogranite
图 5 基于QAP系统对玉京山岩体的分类(a)、SiO2-(K2O+Na2O)分类图(b)(Middlemost, 1994)、SiO2⁃K2O图解(c)(Peccerillo and Taylor, 1976)和A/CNK-A/NK图解(d)(Maniar and Piccoli, 1989)
Fig. 5. Nomenclature system used to classify rocks in the Yujingshan pluton based on the quartz-alkali feldspar-plagioclase classification diagram (a), SiO2-(K2O+ Na2O) classification diagram (b) (after Middlemost, 1994), SiO2-K2O diagram (c) (after Peccerillo and Taylor, 1976) and A/CNK-A/NK diagram (d) (after Maniar and Piccoli, 1989) for the Yujingshan pluton
图 6 玉京山地区糜棱岩化二长花岗岩的球粒陨石标准化稀土元素配分曲线(a)和原始地幔标准化微量元素蛛网图(b)
标准化数据据Sun and Mcdonough（1989）；庐山-武功山早白垩世岩体数据据张海祥和张伯友（2002）；灰色背景为庐山早白垩世侵入岩数据据莫佳君等（2024）
Fig. 6. Chondrite⁃normalized REE diagram (a) and primitive mantle⁃normalized spider diagram (b) of mylonitized monzogranite in the Yujingshan area
图 7 玉京山糜棱岩化二长花岗岩岩石类型判别图
a.（Na2O+K2O）/CaO⁃Zr+Nb+Ce+Y（Whalen et al.，1987）；b. SiO2⁃TFeO/MgO；c. AFC图解
Fig. 7. Plots of (Na2O+K2O)/CaO⁃Zr+Nb+Ce+Y (a), SiO2⁃TFeO/MgO (b) and AFC (c) for the Yujingshan mylonitized monzogranite
图 8 玉京山糜棱岩化二长花岗岩Al2O3/(FeO+MgO+TiO2)⁃Al2O3+FeO+MgO+TiO2(a)及Rb/Ba⁃Rb/Sr(b)(Sylvester, 1998)图解
Fig. 8. Plots of Al2O3/(FeO+MgO+TiO2) vs. Al2O3+FeO+MgO+TiO2 (a), and Rb/Ba versus Rb/Sr (b) (Sylvester, 1998) for the Yujingshan mylonitized monzogranite
图 9 玉京山糜棱岩化二长花岗岩Rb⁃Hf⁃3Ta构造环境判别图解
Fig. 9. Plots of Rb⁃Hf⁃3Ta for the Yujingshan mylonitized monzogranite
表 1 玉京山糜棱岩化二长花岗岩(JX34⁃0)锆石ICP⁃MS U⁃Pb分析结果
Table 1. Results of ICP⁃MS U⁃Pb dating for zircons from the Yujingshan mylonitized monzogranite
测点号 元素含量(μg/g) Th/U 同位素比值 年龄(Ma) 谐和度(%) 206Pb 232Th 238U 206Pb/
238U±2σ 207Pb/
235U±2σ 207Pb/
206Pb±2σ 206Pb/
238U±2σ 207Pb/
235U±2σ 207Pb/
206Pb±2σ 1 13 315 623 0.51 0.018 73 0.000 93 0.129 13 0.010 60 0.051 00 0.005 09 120 6 123 10 165 245 97 2 13 267 612 0.44 0.019 62 0.000 61 0.143 87 0.013 26 0.053 12 0.004 92 125 4 136 12 234 240 91 3 11 170 546 0.31 0.019 86 0.000 78 0.138 48 0.012 12 0.050 69 0.004 55 127 5 131 11 144 208 96 4 12 263 532 0.50 0.019 50 0.000 62 0.138 69 0.015 05 0.051 50 0.005 51 125 4 131 13 227 223 95 5 15 328 662 0.50 0.020 75 0.000 95 0.145 49 0.011 12 0.050 41 0.004 89 132 6 138 10 170 213 96 6 26 313 1 273 0.25 0.019 81 0.000 95 0.138 67 0.011 20 0.050 67 0.004 19 126 6 132 10 156 238 96 7 12 139 558 0.25 0.020 00 0.000 91 0.139 58 0.014 95 0.050 84 0.005 48 128 6 132 14 270 182 96 8 14 96 669 0.14 0.020 16 0.000 78 0.137 45 0.013 31 0.049 32 0.004 19 129 5 131 12 101 230 99 9 15 486 644 0.76 0.018 97 0.000 75 0.138 96 0.015 28 0.053 30 0.006 08 121 5 132 14 258 260 91 10 14 222 638 0.35 0.020 67 0.000 78 0.151 09 0.011 59 0.052 87 0.004 33 132 5 143 10 258 182 92 11 11 235 502 0.47 0.020 15 0.000 72 0.149 65 0.014 36 0.053 81 0.005 23 129 5 141 13 252 255 90 12 18 221 848 0.26 0.020 30 0.000 54 0.139 54 0.009 52 0.049 73 0.003 66 130 3 132 9 116 195 98 13 10 213 477 0.45 0.019 31 0.000 64 0.135 19 0.011 73 0.050 57 0.004 25 123 4 128 11 143 213 96 14 16 348 761 0.46 0.018 87 0.000 65 0.138 96 0.010 53 0.052 72 0.004 41 121 4 132 9 248 188 91 15 20 570 834 0.68 0.019 83 0.000 58 0.146 14 0.011 04 0.053 14 0.003 97 127 4 138 10 281 165 91 16 32 965 1 348 0.72 0.019 60 0.000 44 0.128 83 0.007 76 0.047 39 0.002 72 125 3 123 7 77 119 98 17 19 375 919 0.41 0.018 46 0.000 59 0.133 22 0.011 50 0.052 68 0.004 57 118 4 127 10 271 216 92 18 13 292 577 0.51 0.019 10 0.000 61 0.132 16 0.012 84 0.050 19 0.004 68 122 4 126 12 126 253 97 19 12 329 516 0.64 0.019 20 0.000 64 0.130 83 0.011 96 0.048 62 0.004 01 123 4 125 11 71 204 98 20 14 279 627 0.45 0.019 44 0.000 88 0.144 24 0.017 96 0.053 80 0.006 23 124 6 136 16 282 320 90 21 15 297 666 0.45 0.019 59 0.000 81 0.138 43 0.014 05 0.051 68 0.005 97 125 5 131 12 158 266 95 22 11 216 536 0.40 0.019 00 0.000 82 0.140 05 0.014 71 0.053 99 0.006 17 121 5 133 13 400 186 91 
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表 2 玉京山糜棱岩化二长花岗岩中锆石的LA⁃MC⁃ICP⁃MS Lu⁃Hf同位素分析结果(分析点位同表 1)
Table 2. LA⁃MC⁃ICP⁃MS Lu⁃Hf isotope data of zircons from the Yujingshan mylonitized monzogranite
Spots 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(t) tDM(Ga) tDMC(Ga) Age(Ma) 2 0.102 15 0.000 59 0.002 564 0.000 015 0.282 592 0.000 019 0.282 59 -3.8 1.0 1.4 125 3 0.107 60 0.003 30 0.002 688 0.000 079 0.282 516 0.000 018 0.282 51 -6.5 1.1 1.6 127 4 0.096 39 0.000 39 0.002 376 0.000 012 0.282 551 0.000 020 0.282 55 -5.3 1.0 1.5 124 6 0.112 70 0.001 30 0.002 859 0.000 023 0.282 585 0.000 018 0.282 58 -4.1 1.0 1.4 126 7 0.067 17 0.000 44 0.001 810 0.000 007 0.282 545 0.000 018 0.282 54 -5.4 1.0 1.5 128 8 0.074 80 0.003 20 0.002 011 0.000 088 0.282 536 0.000 019 0.282 53 -5.8 1.0 1.5 129 9 0.098 35 0.000 76 0.002 452 0.000 022 0.282 601 0.000 018 0.282 60 -3.5 1.0 1.4 121 11 0.092 24 0.000 88 0.002 443 0.000 031 0.282 594 0.000 021 0.282 59 -3.8 1.0 1.4 129 13 0.075 40 0.001 20 0.001 906 0.000 024 0.282 594 0.000 017 0.282 59 -3.7 1.0 1.4 123 15 0.121 70 0.002 00 0.003 055 0.000 037 0.282 645 0.000 020 0.282 64 -2.0 0.9 1.3 127
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Table 3. Major and trace element contents of the mylonitized monzogranite in the Yujingshan area
组分 JX34-2 JX34-3 JX34-4 JX34-5 JX34-6 主量元素(%) SiO2 73.68 75.31 74.50 74.63 73.56 TiO2 0.10 0.07 0.13 0.12 0.11 A12O3 14.23 14.03 14.21 13.90 14.14 Fe2O3 0.38 0.20 0.51 0.45 0.54 FeO 0.55 0.56 0.59 0.59 0.56 MnO 0.07 0.05 0.06 0.05 0.06 MgO 0.26 0.24 0.28 0.26 0.27 CaO 0.67 0.69 0.87 0.84 0.84 Na2O 4.06 3.69 3.36 3.36 3.56 K2O 4.11 4.72 4.88 4.87 5.08 P2O5 0.12 0.13 0.16 0.14 0.15 LOI 1.60 0.94 1.02 1.04 1.19 总和 99.82 100.62 100.58 100.25 100.06 Mg# 34 37 32 32 32 FeOT/MgO 3.50 3.09 3.74 3.79 3.82 微量元素(10-6) Li 96.88 84.61 105.15 98.98 98.20 Sc 5.55 3.54 6.16 5.90 5.75 V 5.46 4.83 9.99 7.78 7.74 Ni 4.34 4.80 10.39 2.55 2.86 Co 0.73 0.49 0.90 0.69 0.69 Cu 2.60 3.48 4.59 2.90 1.46 Ga 24.53 21.18 23.70 22.78 22.89 Rb 396.31 386.71 406.79 386.61 386.24 Sr 24.27 35.32 50.30 55.11 60.05 Y 15.83 13.70 20.94 20.13 20.54 Zr 61.42 65.90 93.26 91.12 93.46 Nb 33.43 26.42 35.97 29.71 26.72 Cs 5.34 5.50 6.80 6.50 6.49 Ba 32.04 72.78 119.28 136.03 159.34 La 8.54 8.40 13.27 13.34 12.81 Ce 19.47 17.56 31.37 30.27 29.47 Pr 2.91 2.61 4.18 4.10 4.03 Nd 10.55 9.48 15.54 15.06 14.65 Sm 2.51 2.18 3.42 3.35 3.25 Eu 0.14 0.17 0.25 0.26 0.27 Gd 1.96 1.73 2.81 2.70 2.67 Tb 0.43 0.37 0.57 0.55 0.54 Dy 2.63 2.26 3.48 3.27 3.31 Ho 0.57 0.45 0.70 0.67 0.67 Er 1.55 1.22 1.85 1.77 1.80 Tm 0.32 0.25 0.34 0.33 0.33 Yb 1.98 1.59 2.21 2.08 2.13 Lu 0.33 0.27 0.35 0.34 0.34 Hf 2.15 2.30 2.95 2.97 2.83 Ta 2.97 2.98 3.32 3.07 2.80 Pb 13.61 17.29 17.30 17.20 18.58 Th 11.24 8.01 11.22 11.30 10.64 U 17.98 9.83 8.69 11.06 5.80 ∑REE 53.88 48.54 80.32 78.09 76.28 LREE 44.12 40.39 68.02 66.37 64.48 HREE 9.76 8.14 12.30 11.72 11.80 LREE/HREE 4.52 4.96 5.53 5.66 5.47 (La/Yb)N 2.91 3.57 4.05 4.32 4.06 (La/Sm)N 2.14 2.43 2.44 2.51 2.48 (Gd/Yb)N 0.80 0.88 1.03 1.05 1.01 δEu 0.19 0.26 0.24 0.26 0.28 δCe 0.94 0.90 1.01 0.98 0.98 注：Mg#= MgO/(MgO+FeOT), 为分子比.
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表 4 玉京山糜棱岩化二长花岗岩Sm⁃Nd同位素测试结果
Table 4. Sm⁃Nd isotopic compositions of rocks from the Yujingshan mylonitized monzogranite
样品号 Sm Nd 147Sm/
144Nd143Nd/
144NdεNd(t) tDM
(Ga)tDM2
(Ga)(10-6) JX34-2 2.6 9.4 0.165 3 0.512 123 -9.6 3.4 1.7 JX34-3 2.4 9.1 0.158 8 0.512 092 -10.1 3.0 1.7 JX34-4 3.9 15.5 0.152 8 0.512 148 -8.9 2.5 1.6 JX34-5 3.6 14.6 0.150 3 0.512 135 -9.1 2.4 1.7 JX34-6 3.5 14.0 0.151 5 0.512 097 -9.8 2.6 1.7
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表 5 华南板块东部晚中生代伸展相关火山岩年龄汇总
Table 5. Summary of ages of Late Mesozoic extension-related magmatic rocks in the eastern South China block
序号 位置 岩性 测试方法 地质意义 年龄(Ma) 1 安徽铜陵 正长花岗岩、二长花岗岩 LA-ICP-MS U-Pb锆石 伸展 123~134 2 安徽铜陵 花岗闪长岩、二长花岗岩、花岗岩 SHRIMP U-Pb锆石 伸展 124~135 3 安徽铜陵 石英二长岩 SHRIMP U-Pb锆石 伸展 132~135 4 浙江临安 流纹岩、安山岩 LA-ICP-MS U-Pb锆石 伸展 122~134 5 安徽池州 英安岩、花岗岩 SIMS U-Pb锆石 岩石圈减薄 131~124 6 浙江桐庐 二长花岗岩、花岗岩、花岗闪长岩 LA-ICP-MS U-Pb锆石 伸展 135~100 7 浙江桐庐 火山凝灰岩、石英二长岩 单颗粒锆石U-Pb 伸展 134.4~140.3 8 安徽黄山 斑状花岗岩、二长花岗岩 LA-ICP-MS U-Pb锆石 岩石圈减薄 125.2~127.7 9 江西鹅湖 二长花岗岩 SHRIMP U-Pb锆石 伸展 121.7±2.9 10 浙江白菊花尖 碱性花岗岩 SHRIMP U-Pb锆石 伸展 126.0±3.2 11 江西大桥坞/
杨梅湾花岗岩、花岗斑岩 LA-ICP-MS U-Pb锆石 伸展 134~135 12 浙江龙游 花岗斑岩、正长花岗岩、流纹岩 LA-ICP-MS U-Pb锆石 伸展 127~134 13 浙西北 粗面英安岩、熔结凝灰岩 LA-ICP-MS U-Pb锆石 伸展 118~136 14 浙江鹅湖岭 流纹质熔结凝灰岩 SHRIMP U-Pb锆石 伸展 138.0±2.4 15 江西德兴 二长花岗岩、正长花岗岩、碱性长石花岗岩、辉绿岩 SHRIMP U-Pb锆石 伸展 121.7~129 16 江西三清山 黑云母花岗岩 SHRIMP U-Pb锆石 伸展 123±2.2 17 江西三清山 花岗岩 LA-ICP-MS U-Pb锆石 伸展 131~135 18 江西大茂山 碱性长石花岗岩、正长花岗岩 LA-ICP-MS U-Pb锆石 伸展 130~132 19 江西石溪 粗面岩 SHRIMP U-Pb锆石 伸展 137.00±0.94 20 浙江温州 玄武安山岩 LA-ICP-MS U-Pb锆石 伸展 120.0±1.4 21 浙江温州 流纹岩 LA-ICP-MS U-Pb锆石 伸展 130±5 22 浙江庆元 流纹质凝灰岩、英安质凝灰岩 LA-ICP-MS U-Pb锆石 伸展 144.0~139.9 23 江西城门山 花岗斑岩 SIMS U-Pb锆石 挤压向伸展转换 144.5~146.0 24 江西庐山 花岗岩 LA-ICP-MS U-Pb锆石 伸展 133.0±2.1 25 江西庐山 花岗岩 榍石U-Pb 伸展 127 26 江西相山 花岗岩、煌斑岩 TIMS锆石U-Pb 伸展 125~134 27 江西天华山 流纹岩 LA-ICP-MS U-Pb锆石 伸展 140.0±1.0 28 江西相山 流纹岩 SHRIMP U-Pb锆石 伸展 136.6±2.7 29 江西相山 流纹岩 TIMS U-Pb锆石 伸展 136.0±2.6 30 江西相山 流纹岩 SHRIMP/LA-ICP-MS U-Pb锆石 伸展 134~135 31 江西相山 流纹岩 LA-ICP-MS U-Pb锆石 伸展 129.5±7.9 32 福建外屯/石陂 花岗闪长岩、二长花岗岩、花岗岩 LA-ICP-MS U-Pb锆石 伸展 109~160 33 江西吉安 玄武岩 锆石U-Pb 伸展 139~143 34 福建社口 玄武岩 SHRIMP U-Pb锆石 构造体制转换 142.3±7.2 35 福建泉州 长英质火山岩 MC-ICPMS U-Pb锆石 伸展 130~149 36 福建泉州 花岗岩、花岗闪长岩、闪长岩 SIMS U-Pb锆石 伸展 115.3~117.5 37 福建泉州 二长花岗岩、辉长岩 LA-ICP-MS U-Pb锆石 伸展 108~111 38 福建金山 黑云母花岗岩 ELA-ICP-MS U-Pb锆石 弧后伸展 140±1 39 福建蓝田 花岗岩 LA-ICP-MS U-Pb锆石 131~142 40 广东河源 花岗岩 TIMS U-Pb锆石 伸展 149±1.6 41 广东恶鸡脑 A型花岗岩 SHRIMP U-Pb锆石 伸展 137±2 42 广东水濂山 角闪石花岗岩、黑云母花岗岩 LA-ICP-MS U-Pb锆石 俯冲后撤 136~139 43 香港 凝灰岩、流纹岩 TIMS U-Pb锆石 伸展 142.7~147.5 44 香港 粗面岩、流纹岩 TIMS U-Pb锆石 伸展 141.2~143 45 珠江口盆地 角闪石花岗岩 LA-ICP-MS U-Pb锆石 俯冲后撤 141.6±1.4 46 南沙 二长花岗岩 LA-ICP-MS U-Pb锆石 岩石圈减薄 127.2±0.2 注：据 Wang et al.(2023) 及其内部参考文献.
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