Petrology, geochemistry, zircon U-Pb age characteristics and significance of Dengfuxian pluton in Hu'nan Province
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摘要:
对湖南中生代邓阜仙岩体进行了LA-ICP-MS锆石U-Pb定年和岩石学、岩石地球化学分析。获得斑状黑云母花岗岩的锆石U-Pb年龄为225.1±1.2Ma，表明其形成于晚三叠世，结合已发表的岩体年龄资料，邓阜仙岩体是侵位于印支期（222.9~225.7Ma）和燕山期（151.1~159Ma）的复式岩体。邓阜仙岩体印支期、燕山期花岗岩均具有高的SiO2含量、高的A/CNK值，含过铝质白云母、堇青石等矿物。富集大离子亲石元素Rb、Th、U，明显亏损Nb、Ba、Sr、Ti，稀土元素配分模式为右倾，轻稀土元素富集，Eu亏损相对明显。邓阜仙岩体具低的εNd（t）值，176Hf/177Hf值小于球粒陨石的值。综上认为，邓阜仙岩体印支期、燕山期为S型花岗岩，源区分别为古元古代地壳贫粘土质岩石、富粘土质岩石部分熔融。研究区印支期、燕山期花岗岩均形成于伸展构造体制下，印支期花岗岩形成于印支运动碰撞后的伸展环境，燕山期花岗岩则在太平洋板块俯冲消减作用下形成。
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关键词:
- 湖南 /
- 邓阜仙岩体 /
- LA-ICP-MS锆石U-Pb年龄 /
- S型花岗岩
Abstract:In this paper, the authors analyzed LA-ICP-MS zircon U-Pb dating, petrology and petro-geochemistry of Mesozoic Dengfuxian pluton in Hu'nan Province. The zircon U-Pb age is 225.1±1.2Ma for granodiorite, which suggests that it was formed in Late Triassic. Combined with the age data available, the authors hold that Defuxian pluton is complex rock which intruded in Indo-sinian(222.9~225.7Ma)and Yanshanian(151.1~159Ma). Granites in Indosinian and Yanshanian Dengfuxian pluton all have high content of SiO2 and high ratios of A/CNK and contain para-aluminous muscovite and cordierite mineral. In terms of trace elements, large ion element Rb, Th, U are rich, whereas Nb, Ba, Sr, Ti are poor obviously. The REE distribution patterns exhibit right devia-tion, with rich light rare earth elements and relatively poor Eu. As for isotopes, Dengfuxian pluton has low values of εNd(t), and the ratios of 176Hf/177Hf are lower than the ratio of chondrite (0.282772). In combination with the above-mentioned characteristics and by means of (87sr/86Sr)i-εNd(t) discrimination, the authors consider that the granites in Indosinian and Yanshanian Dengfuxian pluton are of S-type granites, and the source area was formed by partial melting of crustal argillaceous-poor pluton in the region in Paleo-proterozoic and argillaceous-rich pluton. It is considered that the granites in Indosinian and Yanshanian Dengfuxian pluton were formed under the extended tectonic regime, and the granites in Indosinian intruded in the extension setting after the collision of Indo-sinian movement, whereas the granites in Yanshanian period were formed by the subduction of Pacific plate.
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Key words:
- Hu'nan /
- Dengfuxian pluton /
- LA-ICP-MS zircon U-Pb age /
- S-type granite
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表 1 邓阜仙岩体斑状黑云母花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. Isotopic analytical results of zircon LA-ICP-MS U-Th-Pb for biotite granites from Dengfuxian pluton
测点
号含量/10-6 比值 年龄/Ma Pb Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 208Pb/
232Th1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 208Pb
232Th1σ D1-1 140.1 253.4 783.7 0.05126 0.00020 0.25199 0.00122 0.03567 0.00012 0.00223 0.00024 253.8 9.3 228.2 1.0 225.9 0.8 45.1 4.9 D1-2 96.8 189.4 582.0 0.05136 0.00021 0.25114 0.00138 0.03548 0.00015 0.00210 0.00023 257.5 4.6 227.5 1.1 224.7 0.9 42.4 4.6 D1-3 74.7 126.5 476.3 0.05069 0.00024 0.24860 0.00151 0.03557 0.00014 0.00268 0.00029 227.8 11.1 225.4 1.2 225.3 0.8 54.1 5.8 D1-4 122.2 192.6 1090.9 0.05159 0.00037 0.25635 0.00236 0.03603 0.00018 0.00293 0.00059 333.4 16.7 231.7 1.9 228.2 1.2 59.2 11.9 D1-5 140.0 217.9 484.2 0.05303 0.00231 0.25814 0.01191 0.03526 0.00018 0.00208 0.00028 331.5 102.8 233.2 9.6 223.4 1.1 41.9 5.7 D1-6 46.5 73.3 270.5 0.05313 0.00211 0.26137 0.01086 0.03563 0.00017 0.00392 0.00087 344.5 88.9 235.8 8.7 225.7 1.1 79.1 17.5 D1-7 200.1 353.4 829.5 0.05088 0.00019 0.24930 0.00133 0.03554 0.00014 0.00149 0.00017 235.3 4.6 226.0 1.1 225.2 0.9 30.1 3.4 D1-8 75.5 114.6 415.4 0.05343 0.00035 0.26176 0.00232 0.03552 0.00017 0.00221 0.00032 346.4 14.8 236.1 1.9 225.0 1.1 44.6 6.5 D1-9 338.3 488.4 1818.7 0.06525 0.00031 0.30599 0.00210 0.03401 0.00016 0.00149 0.00021 783.3 10.0 271.1 1.6 215.6 1.0 30.2 4.2 D1-10 86.8 137.0 596.8 0.05007 0.00039 0.24355 0.00240 0.03528 0.00024 0.00210 0.00045 198.2 13.9 221.3 2.0 223.5 1.5 42.4 9.0 D1-11 152.1 247.2 854.5 0.05247 0.00041 0.25682 0.00231 0.03550 0.00016 0.00138 0.00024 305.6 18.5 232.1 1.9 224.9 1.0 27.9 4.8 D1-12 72.8 139.2 339.2 0.05097 0.00057 0.24660 0.00284 0.03512 0.00024 0.00138 0.00028 239.0 25.9 223.8 2.3 222.5 1.5 27.9 5.7 D1-13 121.0 223.2 513.9 0.05101 0.00039 0.25040 0.00236 0.03560 0.00019 0.00105 0.00022 242.7 12.0 226.9 1.9 225.5 1.2 21.3 4.5 D1-14 148.6 210.4 655.9 0.05449 0.00027 0.29840 0.00224 0.03972 0.00021 0.00145 0.00032 390.8 38.9 265.1 1.8 251.1 1.3 29.3 6.4 D1-15 121.6 196.1 381.8 0.05805 0.00031 0.28018 0.00187 0.03502 0.00015 0.00131 0.00032 531.5 11.1 250.8 1.5 221.9 0.9 26.5 6.5 D1-17 120.5 176.5 563.3 0.04979 0.00037 0.24299 0.00261 0.03540 0.00026 0.00155 0.00043 183.4 21.3 220.9 2.1 224.2 1.6 31.3 8.7 D1-18 85.6 164.4 185.8 0.05161 0.00040 0.23800 0.00207 0.03347 0.00016 0.00130 0.00040 333.4 18.5 216.8 1.7 212.2 1.0 26.2 8.0 D1-19 48.6 113.3 258.1 0.05017 0.00048 0.24423 0.00249 0.03533 0.00020 0.00171 0.00062 211.2 22.2 221.9 2.0 223.8 1.3 34.5 12.5 D1-20 170.6 244.9 477.3 0.05146 0.00042 0.25234 0.00241 0.03558 0.00023 0.00136 0.00052 261.2 18.5 228.5 2.0 225.4 1.4 27.5 10.4 
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表 2 邓阜仙花岗岩体主量、微量和稀土元素组成
Table 2. The composition of major, trace and rare earth elements for Dengfuxian pluton
样号 Z7 D1 DF54 DF55 DF56 DF57 D2 D3 36 37 Z8 20 DF58 印支期花岗岩 燕山期花岗岩 SiO2 69.2 67.7 71.4 71.1 73.7 70.2 74.1 76.8 76.5 73.5 74.8 73.8 73.8 TiO2 0.72 0.66 0.39 0.42 0.21 0.38 0.18 0.05 0.27 0.18 0.14 0.11 0.16 Al2O3 14.5 15.8 13.7 13.7 13.6 13.8 14.6 13.5 12.5 14.6 14.5 14.7 13.8 FeO 3.71 3.62 1.97 2.28 1.92 2.16 1.47 0.61 0.91 0.61 1.14 0.71 1.05 Fe2O3 0.21 0.71 0.35 0.27 0.36 0.28 0.36 0.38 0.92 1.14 0.1 0.64 0.43 MnO 0.08 0.11 0.07 0.05 0.04 0.06 0.04 0.03 0.02 0.04 0.06 0.14 0.07 MgO 1.28 1.37 0.75 0.81 0.16 0.79 0.38 0.12 0.28 0.36 0.32 0.38 0.33 CaO 2.37 2.76 1.36 1.39 0.71 1.52 0.82 0.36 0.62 0.95 0.65 0.73 0.81 Na2O 2.65 2.36 2.48 2.72 3.12 2.66 3.12 3.59 2.82 3.32 3.17 3.68 3.71 K2O 5.02 4.64 5.63 5.89 5.43 5.73 4.83 4.52 5.01 5.12 4.95 4.95 4.25 P2O5 0.27 0.25 0.18 0.23 0.06 0.24 0.21 0.07 0.11 0.18 0.21 0.15 0.23 烧失量 0.11 0.09 1.12 0.54 0.32 1.32 0.17 0.12 0.13 0.21 0.14 0.21 1.08 总计 100 100 99.3 99.3 99.6 99.1 100 100 100 100 100 100 99.7 TFeO 3.89 4.26 2.29 2.52 2.24 2.41 1.79 0.94 1.73 1.64 1.23 1.28 1.44 ASI 1.03 1.13 1.08 1.02 1.10 1.04 1.25 1.18 1.12 1.14 1.23 1.15 1.13 A/NK 1.48 1.77 1.34 1.26 1.23 1.31 1.44 1.25 1.25 1.32 1.37 1.29 1.29 ALK 7.67 7.01 8.11 8.61 8.55 8.39 7.83 8.11 7.82 8.44 8.12 8.63 7.96 Rb 295 342 272 280 309 454 372 335 349 362 487 372 621 Zr 368 298 193 249 142 193 78.2 31.8 63.2 81.1 68.2 71.3 71.5 Nb 15.5 17.7 14.5 19.3 20.4 15.2 14.7 9.75 15.4 14 11.5 14.1 42.1 Hf 9.74 3.24 5.35 7.01 4.71 4.82 4.72 1.91 2.17 2.32 2.32 1.41 2.51 Th 45.1 37.2 43.7 57.5 63.9 40.3 13.5 3.71 11.4 11.7 11.5 12.3 11.2 U 7.53 5.25 6.91 7.53 9.49 9.85 7.74 8.98 9.67 4.23 13.6 10.4 27.6 Ba 802 900 850 801 210 608 258 57 178 660 203 189 54.6 Sr 337 246 214 188 48.2 159 78.1 60.2 58.1 70.2 46.8 60.4 35.8 Rb/Sr 0.88 1.39 1.27 1.49 6.42 2.86 4.76 5.56 6.01 5.17 10.4 6.16 17.35 La/Nb 8.97 6.67 5.81 4.95 2.96 4.88 1.53 0.81 1.23 1.86 1.33 0.08 0.29 Ba/Nb 51.7 50.9 58.6 41.5 10.3 40.1 17.6 5.85 11.5 47.1 17.7 13.5 1.29 Nb★ 0.12 0.15 0.13 0.16 0.21 0.14 0.21 0.17 0.22 0.19 0.17 0.24 0.74 Y 23.3 22.3 17.6 19.8 61.8 20.7 8.77 27.7 9.71 13.1 8.66 1.59 9.57 La 139 118 84.2 95.5 60.42 74.2 22.5 7.88 18.9 26.1 15.3 1.18 12.3 Ce 303 213 149 173 119 136 47.1 16.9 35.2 53.6 28.7 2.51 24.1 Pr 25.4 23.8 17.5 20.3 14.1 16.2 5.28 2.12 4.31 6.69 3.78 0.32 3.12 Nd 83.5 76.1 54.3 64.6 49.6 51.7 18.2 7.15 15.4 23.9 13.6 1.02 9.81 Sm 11.6 10.9 9.12 10.3 10.6 9.56 3.92 2.09 4.31 4.99 3.14 0.36 2.41 Eu 1.88 1.88 1.46 1.28 0.64 1.26 0.45 0.161 0.53 0.57 0.36 0.04 0.13 Gd 7.15 7.09 6.01 7.51 9.28 6.32 3.29 2.41 3.07 3.75 2.64 0.28 1.83 Tb 1.01 0.92 0.81 0.98 1.59 0.96 0.42 0.51 0.51 0.54 0.37 0.07 0.42 Dy 4.56 4.62 3.62 4.26 10.3 4.17 2.02 3.85 2.25 2.53 1.85 0.31 1.8 Ho 0.8 0.81 0.71 0.75 2.14 0.81 0.31 0.85 0.34 0.36 0.27 0.07 0.37 Er 2.43 2.02 1.92 2.12 6.11 2.18 0.69 2.78 0.85 1.01 0.75 0.12 1.01 Tm 0.29 0.31 0.23 0.26 0.91 0.29 0.11 0.53 0.12 0.13 0.08 0.04 0.15 Yb 1.86 1.94 1.79 1.65 5.93 1.97 0.66 3.86 0.72 0.87 0.54 0.17 0.95 Lu 0.28 0.29 0.28 0.26 0.86 0.27 0.09 0.63 0.11 0.12 0.08 0.03 0.16 ∑REE 606 484 349 403 353 326 114 79.4 96.3 138 80.1 8.1 68.1 (La/Yb)N 53.6 43.6 33.7 41.5 7.31 27.1 24.6 1.46 18.8 21.4 20.3 4.98 9.29 δEu 0.59 0.61 0.57 0.42 0.19 0.47 0.37 0.22 0.42 0.39 0.37 0.39 0.18 LREE 564 443.7 316 366 254 289 97.4 36.3 78.6 116 64.9 5.43 51.8 HREE 41.7 40.3 32.9 37.6 98.9 37.7 16.36 43.1 17.7 22.3 15.2 2.67 16.3 LREE/HREE 13.5 11.1 9.57 9.7 2.57 7.66 5.96 0.84 4.45 5.19 4.26 2.03 3.19 注：主量元素含量单位为%，微量和稀土元素含量为10-6
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表 3 邓阜仙岩体花岗岩全岩Sr-Nd同位素组成
Table 3. The Sr-Nd isotopic data of granites from Dengfuxian pluton
样品号 年龄/Ma 87Rb/86Sr 147Sm/144Nd 87Sr/86Sr(2σ) (87Sr/86Sr)i 143Nd/144Nd(2σ) (143Nd/144Nd)i εNd(t) 数据来源 邓阜仙
印支期227 2.641 0.082 0.723602（15） 0.7151 0.512016（5） 0.511894 -8.82 227 0.1321 0.511967（4） 0.511771 -11.24 本文 227 0.1267 0.511951（6） 0.511763 -11.87 225.7 2.27 0.099 0.723783（9） 0.716493 0.511958（2） 0.511812 -10.4 [7] 225.7 2.83 0.092 0.725229（7） 0.716155 0.511959（4） 0.511823 -10.2 225.7 1.95 0.092 0.722598（6） 0.716339 0.511988（13） 0.511853 -9.7 225.7 3.24 0.081 0.726328（8） 0.715923 0.511958（9） 0.511839 -9.9 222.9 20.2 0.13 0.785388（4） 0.721407 0.511961（20） 0.511772 -11.3 222.9 13.2 0.128 0.769876（5） 0.728078 0.511940（14） 0.511754 -11.7 160 0.1267 0.511951（5） 0.51182 -11.87 本文 154.4 44.8 0.133 0.806505（8） 0.708145 0.511988（4） 0.511854 -11.4 邓阜仙 154.4 69 0.137 0.830597（13） 0.679049 0.512010（6） 0.511871 -11.1 燕山期 154.4 18.9 0.161 0.787593（8） 0.746210 0.512007（22） 0.511845 -11.6 [7] 154.4 23.7 0.146 0.790698（135）0.735473 0.511980（23） 0.511859 -11.3 154.4 17.2 0.146 0.776834（7）0.752989 0.511944（4） 0.511832 -11.8
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表 4 邓阜仙岩体成岩成矿年龄对比统计
Table 4. The statistical table for the comparison of diagenetic and metallogenic ages for Dengfuxian pluton
岩体期次 样品特征 测试对象 测试方法 测试结果/Ma 文献 邓阜仙岩体
印支期花岗闪长岩 锆石 LA-ICP-MS 225.1±1.2 本文 黑云母花岗岩 锆石 LA-ICP-MS 225.7±1.6 [19] 黑云母花岗岩 锆石 LA-ICP-MS 225.3±1.2 二云母花岗岩 锆石 LA-ICP-MS 224.3±2.4 二云母花岗岩 锆石 LA-ICP-MS 222.9±1.6 黑云母花岗岩 锆石 LA-ICP-MS 230±1.6 [8] 黑云母花岗岩 锆石 LA-ICP-MS 218.03±0.85 邓阜仙岩体
燕山期二云母花岗岩 锆石 LA-ICP-MS 154.4±2.2 [7] 斑状二云母花岗岩 锆石 LA-ICP-MS 151.1±2.3 [7] 二云母花岗岩 锆石 LA-ICP-MS 159±0.8 [30] 邓阜仙岩体
成矿年龄石英脉型黑钨矿 辉钼矿 Re-Os等时线 150.5±5.2 [31]
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