Late Devonian magmatic event in the South Beishan orogenic belt, Gansu: Constraints from zircon U-Pb chronology, geochemistry and Sr-Nd-Hf isotopes
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摘要:
北山造山带处于中亚造山带南缘, 研究其岩浆事件对于推演中亚造山带地质构造演化具有重要意义。在甘肃北山南带的双鹰山-花牛山岛弧带中, 分布有大量花岗质岩体。本文选取甘肃北山南带双峰山南复式岩体中的花岗闪长岩和二长花岗岩, 开展LA-ICP-MS锆石年代学、Hf同位素、全岩地球化学和Sr-Nd同位素研究。研究结果表明该复式岩体成岩时代、地球化学与同位素特征基本一致, 具体如下: (1)锆石年代学结果显示二长花岗岩年龄为367.5±1.7Ma、368.0±1.8Ma, 花岗闪长岩年龄为366.3±2.2Ma, 均为晚泥盆世; (2)复式岩体SiO2含量为64.39%~74.95%、碱含量为5.01%~9.21%, 属准铝质(A/CNK=0.88~1.00), P2O5含量低(0.02%~0.17%), 且与SiO2呈负相关, 具有典型的I型花岗岩特征; (3)样品总体富集轻稀土元素((La/Yb)N=6.23~23.0), 具有较强烈的Eu负异常(δEu=0.31~0.55), 富集Rb、Th、U等大离子亲石元素, 亏损Nb、Ti、P等高场强元素; (4)锆石εHf(t)值为-3.1~+6.0, tDM2为928~1327Ma, 全岩(87Sr/86Sr)i在0.705607~0.708523之间, εNd(t)在-4.1~-1.9之间。结合区域构造环境, 实验数据表明, 双峰山南晚泥盆世复式岩体是在活动大陆边缘的环境下, 由幔源岩浆底侵加热下地壳使之部分熔融, 并与之混合形成的, 代表了晚泥盆世柳园洋向北俯冲的构造事件。
Abstract:Beishan orogenic belt (BOB) is located on the southern margin of the Central Asian Orogenic Belt (CAOB). The study of magmatic events in BOB is of great significance for understanding the tectonic evolution of the CAOB. A large number of granitiod plutons are distributed in the south of BOB, where the Shuangyingshan and Huaniushan arcs are located. In this study, we focus on granodiorite and monzogranite from the south Shuangfengshan complex in the southern BOB. We present whole rock geochemistry, Sr-Nd isotopic composition, in situ U-Pb dating and Hf isotopic composition of zircons from this complex, from which the following results are obtained: (1) The granodiorites and monzogranites have similar zircon U-Pb chronology, whole rock geochemistry and isotopic composition. (2) Zircon LA-ICP-MS U-Pb dating yields ages of 367.5±1.7Ma and 368.0±1.8Ma for the monzogranite, and 366.3±2.2Ma for the granodiorite, suggesting they were formed in the Late Devonian. (3) The SiO2 contents from samples collected in the complex are 64.39%~74.95%, with alkali contents of 5.01%~9.21%, suggesting it belongs to metaluminous (A/CNK=0.88~1.00); the measured samples have low P2O5 contents (0.02%~0.17%), which are negatively correlated to SiO2. These features indicated they are of typical I-type granite characteristics. (4) For the REE compositions, this complex is characterized by enriched light rare earth elements ((La/Yb)N=6.23~23.0), negative Eu anomaly (δEu=0.31~0.55), enriched large ion lithophile elements, such as Rb, Th, U, and depleted high field strength elements such as Nb, Ti, and P. (5) The complex has εHf(t) values of -3.1~+6.0, two stage model ages (tDM2) of 928~1327Ma, (87Sr/86Sr)i values of 0.705607~0.708523, and εNd(t) values of -4.1~-1.9. Combined with the regional geology and tectonic environment, these data reveals that the south Shuangfengshan complex was formed in an active continental margin in Late Devonian, and during its evolution, the lower crust was partially melted by the underplating of mantle-derived magma and mixing with mantle-derived materials, which represented a northward subduction of the Liuyuan Ocean plate in the Late Devonian.
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Key words:
- Magmatic Event /
- Late Devonian /
- Tectonic setting /
- Beishan Orogenic belt /
- Central Asian Orogenic Belt
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图 1
中亚造山带构造位置(a，据He et al., 2018)及北山造山带构造简图(b，据Song et al., 2013; Xiao et al., 2018)
Figure 1.
Simplified tectonic map of Central Asian Orogenic Belt (a, modified after He et al., 2018) and the Beishan orogenic belt (b, modified after Xiao et al., 2018; Song et al., 2013)
图 2
双峰山-花牛山-长流水一带地质简图(据王春女等, 2019; 甘肃省地质矿产局, 1987修改)
Figure 2.
Geological map of Shuangfengshan-Huaniushan-Changshui region (modified after Wang et al., 2019)
图 3
双峰山南复式岩体岩性野外及显微照片
Figure 3.
Field outcrops and micrographs of the South Shuangfengshan complex
图 4
山南复式岩体样品锆石阴极发光图像
Figure 4.
Cathodoluminescence images of zircons for South Shuangfengshan complex
图 5
双峰山南复式岩体锆石年龄协和图
Figure 5.
Zircon U-Pb diagrams diagrams of South Shuangfengshan complex
图 6
双峰山南复式岩体TAS图解(a，底图据Middlemost, 1994)和SiO2-K2O图解(b，底图据Peccerillo and Taylor, 1976)
Figure 6.
TAS (a, base map after Middlemost, 1994) and SiO2 vs. K2O (b, base map after Peccerillo and Taylor, 1976) diagrams for the South Shuangfengshan complex
图 7
双峰山南复式岩体A/NK-A/CNK图(底图据Maniar and Piccoli, 1989)
Figure 7.
A/NK vs. A/CNK diagram for the South Shuangfengshan complex (base map after Maniar and Piccoli, 1989)
图 8
双峰山南复式岩体球粒陨石标准化稀土元素配分图(a)及原始地幔标准化微量元素蛛网图(b)(标准化值据Sun and McDonough, 1989)
Figure 8.
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider (b) diagrams of the South Shuangfengshan complex (normalization values after Sun and McDonough, 1989)
图 9
甘肃双峰山南复式岩体样品锆石Hf同位素组成(底图据吴福元等, 2007)
Figure 9.
Zircon Hf isotopic compositions of the South Shuangfengshan complex (base map after Wu et al., 2007)
图 10
甘肃双峰山南复式岩体样品全岩Sr-Nd同位素组成(底图据洪大卫等, 2000; Ding et al., 2017)
Figure 10.
The whole rock Sr-Nd isotopic composition of the South Shuangfengshan complex (base map after Hong et al. 2000; Ding et al., 2017)
图 11
双峰山南复式岩体类型判别图(底图据Whalen et al., 1987)
Figure 11.
Discrimination diagrams of the South Shuangfengshan complex (base map after Whalen et al., 1987)
图 12
双峰山南复式岩体Hacker图解
Figure 12.
Hacker diagrams of the studied samples from the South Shuangfengshan complex
图 13
双峰山南复式岩体成因判别图(底图据Schiano et al., 2010)
Figure 13.
Genetic discrimination charts of the South Shuangfengshan complex (base map after Schiano et al., 2010)
图 14
双峰山南复式岩体构造环境判别图(底图据Pearce et al., 1984)
Figure 14.
Determination of tectonic environments of the South Shuangfengshan complex (base map after Pearce et al., 1984)
图 15
甘肃北山南带花牛山-双鹰山弧地区泥盆纪构造演化模型示意图(据王疆涛等, 2016；Guo et al., 2017修改)
Figure 15.
Schematic tectonic model of the Devonian Huniushan-Shuangyingshan arc in the southern BOB (modified after Wang et al., 2016; Guo et al., 2017)
表 1
双峰山南复式岩体锆石LA-ICP-MS U-Pb定年结果
Table 1.
Zircon LA-ICP-MS U-Pb isotopic data of the South Shuangfengshan complex
测点号 Th U Th/U 同位素比值 年龄(Ma) 谐和度 (×10-6) 
1σ 
1σ 
1σ 1σ 1σ 1σ TW6237-3中细粒黑云母花岗闪长岩 -02 83 153 0.54 0.05319 0.00199 0.42295 0.01524 0.05840 0.00122 337 84.7 358 10.9 366 7.4 97.8% -03 131 177 0.74 0.05261 0.00115 0.42543 0.00956 0.05877 0.00061 312 49.7 360 6.8 368 3.7 97.7% -04 75 84 0.89 0.05512 0.00237 0.43993 0.01729 0.05858 0.00087 417 95.9 370 12.2 367 5.3 99.1% -05 150 142 1.06 0.05298 0.00237 0.42231 0.01810 0.05829 0.00122 328 101.7 358 12.9 365 7.4 97.9% -06 83 126 0.66 0.05284 0.00127 0.42251 0.01063 0.05882 0.00084 322 54.5 358 7.6 368 5.1 97.0% -07 92 157 0.59 0.05401 0.00140 0.42892 0.00985 0.05846 0.00092 372 58.2 362 7.0 366 5.6 99.0% -08 223 281 0.80 0.05351 0.00151 0.42626 0.01156 0.05854 0.00098 351 63.7 361 8.2 367 5.9 98.3% -09 46 72 0.64 0.05463 0.00193 0.43192 0.01498 0.05838 0.00076 397 79.2 365 10.6 366 4.7 99.7% -10 90 97 0.93 0.05576 0.00230 0.44295 0.01884 0.05814 0.00139 443 91.9 372 13.3 364 8.5 97.8% -11 123 181 0.68 0.05371 0.00149 0.43105 0.01178 0.05861 0.00069 359 62.7 364 8.4 367 4.2 99.1% -12 124 179 0.69 0.05535 0.00140 0.43985 0.01203 0.05818 0.00096 426 56.2 370 8.5 365 5.8 98.5% -13 143 174 0.82 0.05375 0.00186 0.43227 0.01650 0.05839 0.00108 361 78.0 365 11.7 366 6.6 99.7% -14 88 108 0.81 0.05395 0.00262 0.42569 0.01860 0.05836 0.00142 369 109.4 360 13.2 366 8.7 98.5% -15 174 259 0.67 0.05320 0.00119 0.42328 0.01012 0.05826 0.00093 337 50.9 358 7.2 365 5.6 98.2% -16 341 290 1.18 0.05340 0.00121 0.42771 0.01037 0.05851 0.00092 346 51.4 362 7.4 367 5.6 98.6% -17 73 126 0.58 0.05493 0.00185 0.44321 0.01542 0.05867 0.00085 409 75.2 373 10.9 368 5.2 98.7% -18 163 241 0.67 0.05354 0.00160 0.42817 0.01335 0.05850 0.00107 352 67.6 362 9.5 366 6.5 98.7% -19 67 66 1.02 0.05384 0.00232 0.42583 0.01716 0.05831 0.00100 364 97.2 360 12.2 365 6.1 98.6% -20 532 448 1.19 0.05347 0.00089 0.42756 0.00857 0.05826 0.00073 349 37.6 361 6.1 365 4.4 99.0% -21 51 79 0.65 0.05539 0.00190 0.43740 0.01459 0.05859 0.00109 428 76.5 368 10.3 367 6.7 99.6% -22 95 135 0.71 0.05256 0.00119 0.42356 0.01228 0.05842 0.00087 310 51.6 359 8.8 366 5.3 97.9% -24 107 158 0.68 0.05309 0.00146 0.42531 0.01172 0.05834 0.00060 333 62.5 360 8.3 366 3.7 98.4% -25 104 174 0.60 0.05289 0.00170 0.42102 0.01420 0.05825 0.00094 324 73.1 357 10.1 365 5.7 97.7% TW6239-1中粒黑云母花岗闪长岩 -01 220 323 0.68 0.05402 0.00088 0.43425 0.00792 0.05837 0.00061 372 36.5 366 5.6 366 3.7 99.9% -04 167 303 0.55 0.05473 0.00118 0.44328 0.01091 0.05862 0.00076 401 48.2 373 7.7 367 4.6 98.6% -05 369 571 0.65 0.05399 0.00089 0.43898 0.00797 0.05896 0.00058 371 37.1 370 5.6 369 3.5 99.9% -07 93 227 0.41 0.05470 0.00118 0.44127 0.01021 0.05873 0.00095 400 48.2 371 7.2 368 5.8 99.1% -08 276 351 0.79 0.05429 0.00123 0.43966 0.01054 0.05874 0.00070 383 51.1 370 7.4 368 4.2 99.4% -09 701 1194 0.59 0.05487 0.00087 0.44666 0.01022 0.05887 0.00072 407 35.6 375 7.2 369 4.4 98.3% -10 1172 819 1.43 0.05531 0.00083 0.44807 0.00894 0.05863 0.00073 425 33.5 376 6.3 367 4.4 97.7% -11 145 272 0.53 0.05407 0.00095 0.43646 0.00777 0.05889 0.00065 374 39.4 368 5.5 369 4.0 99.7% -12 375 663 0.57 0.05393 0.00063 0.43635 0.00619 0.05861 0.00046 368 26.4 368 4.4 367 2.8 99.9% -13 434 719 0.60 0.05390 0.00071 0.43622 0.00622 0.05876 0.00059 367 29.5 368 4.4 368 3.6 99.9% -14 135 263 0.52 0.05280 0.00120 0.42738 0.01032 0.05882 0.00081 320 51.5 361 7.3 368 4.9 98.0% -15 293 345 0.85 0.05487 0.00094 0.44177 0.00781 0.05856 0.00066 407 38.3 371 5.5 367 4.0 98.8% -16 360 489 0.74 0.05530 0.00096 0.44518 0.00854 0.05858 0.00078 424 38.6 374 6.0 367 4.8 98.2% -17 301 303 1.00 0.05465 0.00077 0.44331 0.00819 0.05863 0.00062 398 31.7 373 5.8 367 3.8 98.6% -18 224 381 0.59 0.05321 0.00095 0.42857 0.00785 0.05858 0.00068 338 40.4 362 5.6 367 4.2 98.7% -20 227 386 0.59 0.05468 0.00125 0.43940 0.01083 0.05850 0.00086 399 51.3 370 7.6 366 5.3 99.1% -21 285 651 0.44 0.05491 0.00063 0.44438 0.00626 0.05863 0.00049 409 25.8 373 4.4 367 3.0 98.4% -22 263 376 0.70 0.05446 0.00071 0.43960 0.00726 0.05865 0.00072 390 29.4 370 5.1 367 4.4 99.3% -23 380 592 0.64 0.05446 0.00076 0.44047 0.00657 0.05867 0.00064 390 31.2 371 4.6 368 3.9 99.2% -24 287 551 0.52 0.05463 0.00081 0.44282 0.00921 0.05856 0.00075 397 33.4 372 6.5 367 4.6 98.6% -25 288 319 0.90 0.05440 0.00124 0.43968 0.01017 0.05874 0.00078 387 51.3 370 7.2 368 4.8 99.4% TW6240-1中粒黑云母二长花岗岩 -01 303 390 0.78 0.05562 0.00097 0.44986 0.00969 0.05868 0.00070 437 39.0 377 6.8 368 4.2 97.5% -06 289 391 0.74 0.05450 0.00070 0.44211 0.00724 0.05878 0.00062 392 29.0 372 5.1 368 3.8 99.1% -07 121 213 0.57 0.05407 0.00081 0.43884 0.00783 0.05872 0.00058 374 33.6 369 5.5 368 3.5 99.6% -09 191 303 0.63 0.05623 0.00075 0.45619 0.00717 0.05880 0.00059 461 29.5 382 5.0 368 3.6 96.5% -10 169 266 0.63 0.05472 0.00082 0.44285 0.00821 0.05855 0.00058 401 33.4 372 5.8 367 3.5 98.5% -11 114 206 0.55 0.05406 0.00156 0.43972 0.01280 0.05878 0.00083 373 65.1 370 9.0 368 5.1 99.5% -12 93 178 0.52 0.05410 0.00146 0.44115 0.01299 0.05883 0.00080 375 60.7 371 9.2 368 4.9 99.3% -13 196 289 0.68 0.05402 0.00072 0.43629 0.00639 0.05852 0.00047 372 30.0 368 4.5 367 2.9 99.7% -14 202 313 0.65 0.05404 0.00070 0.43803 0.00638 0.05877 0.00050 373 29.1 369 4.5 368 3.1 99.8% -16 144 240 0.60 0.05481 0.00097 0.44461 0.00837 0.05875 0.00056 404 39.5 373 5.9 368 3.4 98.5% -18 100 191 0.52 0.05363 0.00148 0.43625 0.01231 0.05889 0.00074 356 62.4 368 8.7 369 4.5 99.7% -19 238 390 0.61 0.05486 0.00122 0.44560 0.00965 0.05886 0.00062 406 49.6 374 6.8 369 3.7 98.5% -20 245 374 0.66 0.05372 0.00075 0.43473 0.00561 0.05876 0.00046 359 31.7 367 4.0 368 2.8 99.6% -21 228 1081 0.21 0.05549 0.00091 0.44925 0.00744 0.05883 0.00071 432 36.5 377 5.2 369 4.3 97.8% -22 115 202 0.57 0.05454 0.00194 0.44216 0.01887 0.05903 0.00139 394 79.9 372 13.3 370 8.5 99.5% -24 366 484 0.76 0.05435 0.00097 0.43816 0.00820 0.05857 0.00095 386 40.1 369 5.8 367 5.8 99.4% -25 301 403 0.75 0.05430 0.00103 0.44149 0.00755 0.05895 0.00066 384 42.8 371 5.3 369 4.0 99.4% 
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表 2
双峰山南复式岩体全岩主量(wt%)和微量(×10-6)元素数据表
Table 2.
Whole rock major (wt%) and trace (×10-6) elements of the South Shuangfengshan complex
样品号 TW6237-1 TW6237-2 TW6237-3 TW6239-1 TW6239-2 TW6240-1 TW6240-2 岩性 中粒黑云母花岗闪长岩 中粒黑云母二长花岗岩 SiO2 70.64 64.39 67.32 71.87 74.95 71.03 74.41 TiO2 0.53 0.72 0.60 0.38 0.25 0.20 0.13 Al2O3 12.36 15.78 13.68 13.84 13.28 13.17 11.58 FeOT 4.31 5.32 4.78 2.73 1.99 2.15 1.35 MnO 0.08 0.09 0.08 0.05 0.05 0.05 0.04 MgO 2.08 2.34 2.21 0.96 0.55 0.18 0.24 CaO 2.90 5.21 4.31 2.95 2.50 2.06 1.02 Na2O 2.77 3.80 3.47 3.84 3.40 2.33 2.51 K2O 2.89 1.26 1.55 2.36 2.89 6.88 5.19 P2O5 0.12 0.16 0.17 0.10 0.06 0.02 0.03 LOI 1.45 1.13 1.54 0.73 0.76 2.30 3.83 Total 100.14 100.19 99.70 99.80 100.67 100.36 100.32 Na2O+K2O 5.66 5.06 5.01 6.20 6.28 9.21 7.70 A/NK 1.61 2.07 1.85 1.56 1.52 1.17 1.19 A/CNK 0.95 0.92 0.90 0.97 1.00 0.88 1.00 FeOT/Mg 2.07 2.27 2.17 2.86 3.59 11.84 5.63 Li 36.53 9.78 12.15 11.65 26.15 18.54 92.80 Be 1.66 1.65 1.65 2.57 2.15 1.67 2.61 Sc 12.32 13.81 12.24 5.37 4.28 7.35 14.77 Ti 3660 5812 4331 2655 1838 1485 5735 V 68.84 107.1 72.66 34.10 20.73 4.08 91.72 Mn 633.4 883.8 683.5 402.0 382.3 379.8 854.1 Co 12.09 18.22 16.03 6.21 3.66 1.11 17.65 Ni 14.20 14.58 16.52 8.58 3.20 1.71 25.08 Cu 7.12 12.98 8.74 5.77 6.69 44.42 10.07 Zn 101.9 111.9 92.63 132.8 55.46 98.65 138.5 Ga 16.88 23.92 19.17 20.37 18.21 23.14 23.84 As 5.43 2.85 2.48 1.15 0.63 7.25 1.85 Rb 105.6 62.28 54.40 86.51 148.6 238.8 55.29 Sr 176.8 306.9 223.0 208.9 146.8 85.85 245.8 Y 25.73 30.93 27.40 18.36 19.73 67.92 37.91 Zr 149.4 198.9 187.8 179.3 169.9 424.8 226.6 Nb 12.85 12.68 12.39 13.42 11.46 26.66 22.34 Mo 0.20 0.31 0.23 0.38 0.19 0.82 0.34 Cd 0.09 0.14 0.11 0.07 0.08 0.18 0.10 In 0.04 0.06 0.05 0.03 0.03 0.19 0.05 Cs 12.37 5.40 1.38 2.13 4.28 4.12 3.18 Ba 247.2 202.3 257.6 339.3 295.6 649.3 161.8 La 41.05 44.59 37.21 43.11 36.15 59.59 36.26 Ce 76.97 70.76 57.88 71.78 51.33 117.4 77.80 Pr 7.64 7.40 5.92 6.32 5.20 14.30 8.84 Nd 31.42 32.90 26.17 26.75 22.28 42.28 38.76 Sm 4.51 5.37 4.46 3.93 3.56 12.80 6.49 Eu 0.72 1.19 0.96 0.70 0.62 1.38 0.99 Gd 3.56 5.07 4.47 3.85 3.31 14.76 5.80 Tb 0.36 0.51 0.45 0.27 0.29 1.84 0.61 Dy 4.00 4.78 4.27 2.89 3.00 13.99 5.85 Ho 0.79 0.96 0.85 0.56 0.58 2.80 1.17 Er 2.49 2.98 2.63 1.83 1.89 8.32 3.65 Tm 0.36 0.41 0.37 0.25 0.26 1.09 0.52 Yb 2.45 2.75 2.54 1.65 1.80 6.86 3.53 Lu 0.41 0.43 0.41 0.26 0.29 1.02 0.56 Hf 5.08 5.68 5.57 5.51 5.34 13.32 6.74 Ta 4.91 2.73 3.01 3.92 4.37 4.58 7.14 W 0.47 0.40 0.23 0.33 0.23 1.00 0.23 Tl 0.53 0.27 0.19 0.37 0.68 0.97 0.31 Pb 18.53 10.49 13.95 14.26 18.22 36.88 14.36 Bi 0.08 0.06 0.04 0.23 0.11 0.17 0.06 Th 26.09 8.90 12.05 16.11 18.01 22.63 21.65 U 1.87 1.12 1.01 1.16 2.05 2.51 1.31 ΣREE 176.7 180.1 148.6 164.2 130.6 298.4 190.8 LREE 162.3 162.2 132.6 152.6 119.2 247.7 169.1 HREE 14.42 17.90 15.99 11.56 11.43 50.68 21.69 LREE/HREE 11.3 9.06 8.29 13.2 10.4 4.89 7.80 (La/Yb)N 12.0 11.6 10.5 18.7 14.4 6.23 7.37 δEu 0.53 0.69 0.65 0.55 0.55 0.31 0.48 δCe 0.99 0.87 0.86 0.94 0.81 0.95 1.03
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表 3
双峰山南复式岩体锆石Hf同位素组成
Table 3.
Zircon Hf isotopic compositions of the South Shuangfengshan complex
测点号 Age(Ma) 
2σ 
2σ 
2σ 
εHf(t) tDM1(Ma) tDM2(Ma) fLu/Hf TW6237-3中细粒黑云母花岗闪长岩 -2 366 0.037932 0.000206 0.001168 0.000005 0.282660 0.000041 0.282652 3.8 842 975 -0.96 -7 366 0.040083 0.000434 0.001252 0.000015 0.282681 0.000034 0.282672 4.5 815 938 -0.96 -8 367 0.044766 0.000286 0.001410 0.000009 0.282642 0.000037 0.282633 3.1 873 1009 -0.96 -9 366 0.032620 0.000218 0.000975 0.000007 0.282683 0.000036 0.282677 4.7 805 930 -0.97 -10 364 0.039149 0.000100 0.001149 0.000003 0.282631 0.000037 0.282623 2.7 883 1028 -0.97 -12 365 0.037712 0.000326 0.001174 0.000006 0.282685 0.000042 0.282677 4.7 807 930 -0.96 -13 366 0.033474 0.000372 0.001028 0.000008 0.282664 0.000033 0.282657 4.0 833 965 -0.97 -14 366 0.046061 0.000322 0.001345 0.000012 0.282698 0.000049 0.282689 5.1 792 908 -0.96 -15 365 0.041256 0.000282 0.001514 0.000007 0.282716 0.000054 0.282706 5.7 770 878 -0.95 -16 367 0.031821 0.000750 0.000986 0.000019 0.282670 0.000033 0.282663 4.2 824 954 -0.97 -18 366 0.036799 0.000204 0.001135 0.000007 0.282700 0.000038 0.282693 5.3 784 901 -0.97 -19 365 0.048276 0.000228 0.001441 0.000005 0.282690 0.000044 0.282680 4.8 806 925 -0.96 -20 365 0.074256 0.000440 0.002246 0.000011 0.282731 0.000043 0.282715 6.0 764 860 -0.93 -22 366 0.037631 0.000083 0.001163 0.000004 0.282703 0.000036 0.282695 5.3 781 896 -0.96 -24 366 0.044513 0.000334 0.001422 0.000010 0.282677 0.000037 0.282668 4.3 823 947 -0.96 -25 365 0.033812 0.000340 0.001054 0.000012 0.282635 0.000037 0.282627 2.9 875 1019 -0.97 TW6239-1中粒黑云母花岗闪长岩 -1 366 0.044617 0.000218 0.001321 0.000005 0.282656 0.000030 0.282647 3.6 851 983 -0.96 -4 367 0.044827 0.000336 0.001359 0.000010 0.282678 0.000036 0.282669 4.4 821 944 -0.96 -7 368 0.043876 0.000722 0.001322 0.000017 0.282617 0.000037 0.282608 2.3 906 1053 -0.96 -8 368 0.047991 0.000176 0.001397 0.000003 0.282680 0.000036 0.282671 4.5 818 940 -0.96 -10 367 0.044685 0.000398 0.001217 0.000009 0.282640 0.000031 0.282632 3.1 871 1010 -0.96 -12 367 0.047998 0.000123 0.001302 0.000002 0.282593 0.000031 0.282584 1.4 941 1097 -0.96 -15 367 0.051692 0.000900 0.001472 0.000021 0.282675 0.000039 0.282665 4.3 828 951 -0.96 -16 367 0.069123 0.000198 0.001968 0.000005 0.282616 0.000043 0.282602 2.1 925 1065 -0.94 -17 367 0.045946 0.000866 0.001443 0.000032 0.282688 0.000042 0.282678 4.7 809 928 -0.96 -18 367 0.043518 0.000298 0.001282 0.000005 0.282674 0.000033 0.282665 4.3 825 950 -0.96 -20 366 0.054303 0.000398 0.001577 0.000010 0.282649 0.000032 0.282638 3.3 868 1000 -0.95 -21 367 0.044541 0.000184 0.001280 0.000006 0.282669 0.000029 0.282660 4.1 832 960 -0.96 -22 367 0.035241 0.000264 0.001063 0.000007 0.282660 0.000034 0.282653 3.9 840 973 -0.97 -23 368 0.043256 0.000552 0.001389 0.000010 0.282627 0.000035 0.282617 2.6 894 1037 -0.96 -24 367 0.045701 0.000714 0.001198 0.000016 0.282610 0.000039 0.282602 2.0 914 1065 -0.96 -25 368 0.060761 0.000896 0.001790 0.000019 0.282664 0.000043 0.282652 3.9 850 974 -0.95 TW6240-1中粒黑云母二长花岗岩 -1 368 0.048509 0.000682 0.001534 0.000025 0.282573 0.000054 0.282562 0.7 975 1136 -0.95 -6 368 0.046340 0.000164 0.001356 0.000011 0.282669 0.000052 0.282660 4.1 834 960 -0.96 -7 368 0.038426 0.000484 0.001241 0.000016 0.282465 0.000077 0.282457 -3.1 1119 1326 -0.96 -10 367 0.057602 0.000123 0.001563 0.000003 0.282632 0.000049 0.282621 2.7 892 1030 -0.95 -11 368 0.027580 0.000135 0.000862 0.000007 0.282574 0.000042 0.282568 0.9 956 1126 -0.97 -12 368 0.034663 0.000210 0.001091 0.000007 0.282558 0.000045 0.282551 0.3 984 1157 -0.97 -13 367 0.040017 0.000162 0.001181 0.000003 0.282516 0.000049 0.282508 -1.3 1046 1235 -0.96 -14 368 0.046855 0.000230 0.001522 0.000005 0.282597 0.000058 0.282587 1.5 940 1092 -0.95 -16 368 0.051492 0.000298 0.001609 0.000008 0.282489 0.000057 0.282478 -2.3 1097 1288 -0.95 -18 369 0.041459 0.000230 0.001362 0.000008 0.282589 0.000064 0.282580 1.3 947 1104 -0.96 -19 369 0.055367 0.000318 0.001625 0.000003 0.282628 0.000046 0.282617 2.6 898 1037 -0.95 -20 368 0.050395 0.000324 0.001503 0.000007 0.282556 0.000044 0.282546 0.1 998 1166 -0.95 -21 369 0.047576 0.000472 0.001386 0.000008 0.282544 0.000040 0.282535 -0.3 1011 1186 -0.96 -22 370 0.064809 0.000990 0.002006 0.000033 0.282511 0.000070 0.282497 -1.6 1077 1254 -0.94 -24 367 0.053628 0.000338 0.001722 0.000009 0.282643 0.000126 0.282631 3.1 879 1012 -0.95 -25 369 0.053944 0.000286 0.001655 0.000015 0.282599 0.000053 0.282587 1.6 941 1091 -0.95
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表 4
甘肃双峰山南复式岩体全岩Sr-Nd同位素组成
Table 4.
The whole rock Sr-Nd isotopic composition of the South Shuangfengshan complex
样品号 Age (Ma) Rb Sr 
±2σ 
Sm Nd 
±2σ εNd(t) tDM tDM2 (×10-6) (×10-6) (Ma) TW6237-1 366 105.5 181.5 1.6813 0.714368 0.000021 0.70561 4.5 27.1 0.101773 0.512284 0.000007 -2.5 1179 1340 TW6237-2 366 41.1 281.0 0.4227 0.708561 0.000017 0.70636 4.9 26.4 0.112147 0.512331 0.000008 -2.0 1228 1302 TW6237-3 366 42.5 221.0 0.5578 0.709189 0.000014 0.70628 4.6 23.7 0.116825 0.512329 0.000007 -2.3 1290 1324 TW6239-1 367 83.1 216.4 1.1117 0.713478 0.000018 0.70767 4.5 26.4 0.102779 0.512203 0.000005 -4.1 1300 1474 TW6239-2 367 137.8 146.5 2.7220 0.720491 0.000016 0.70627 3.5 19.1 0.111476 0.512251 0.000006 -3.6 1339 1430 TW6240-1 368 180.4 128.3 4.0683 0.729838 0.000015 0.70852 10.5 51.3 0.124737 0.512254 0.000010 -4.1 1532 1476 TW6240-2 368 51.4 239.7 0.6202 0.711212 0.000014 0.70796 6.6 34.7 0.115280 0.512344 0.000006 -1.9 1247 1294
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表 5
北山南带花岗质侵入体同位素年代学年龄统计
Table 5.
Isotopic chronology statistics of granitiod plutons in the southern BOB
地质时代 所属岛弧带 岩体位置 岩性 成岩年龄(Ma) 测试方法 资料来源 三叠纪 花牛山弧 花牛山 钾长花岗岩 225.6±2.2 锆石U-Pb LA-ICP-MS 朱江, 2013 花牛山 钾长花岗岩 221.0±3.3 锆石U-Pb LA-ICP-MS Li et al., 2012 花牛山 花岗斑岩 232.4±0.6 锆石U-Pb LA-ICP-MS 王怀涛, 2019 花西山 正长花岗岩、正长花岗斑岩 227.3±0.6、228.5±0.7 锆石U-Pb LA-ICP-MS 李增达, 2018 东大泉 正长花岗岩、二长花岗岩 238.2±0.7、237.4±0.6 锆石U-Pb LA-ICP-MS 李增达, 2018 大泉 钾长花岗岩 220.5±2.1、224.6±0.9 锆石U-Pb LA-ICP-MS Li et al., 2012 小泉 斑状花岗岩 220±3 锆石U-Pb LA-ICP-MS 王怀涛, 2019 长流水 正长花岗岩、二长花岗岩 230.3±0.8、227.9±0.5 锆石U-Pb LA-ICP-MS 李增达, 2018 长流水 钾长花岗岩 222.2±1.7 锆石U-Pb LA-ICP-MS Li et al., 2012 石板山弧 小西弓 石英正长斑岩 246.4±2.5 锆石U-Pb LA-ICP-MS 朱江, 2013 晚石炭世-早二叠世 石板山弧 音凹峡南 花岗岩 281.7±2.5 锆石U-Pb LA-ICP-MS 张文等, 2011 石板泉 花岗岩 280.5±5.5 锆石U-Pb LA-ICP-MS 朱江, 2013 石板墩 片麻状花岗岩 294±2、304±2 锆石U-Pb LA-ICP-MS Song, et al., 2016 桥湾北 角闪石花岗岩 303.7±2.4 锆石U-Pb LA-ICP-MS 冯继承等, 2012 晚泥盆世-早石炭世 花牛山弧 双峰山 花岗闪长岩 334.8±2.1 锆石U-Pb LA-ICP-MS 王怀涛, 2019 大山头 石英闪长岩 348.6±1.9 锆石U-Pb LA-ICP-MS 王怀涛, 2019 花牛山 石英闪长岩 362.5±1.1 锆石U-Pb LA-ICP-MS 王怀涛, 2019 双峰山南 花岗闪长岩、二长花岗岩 366.3±2.2、367.5±1.7、368.0±1.8 锆石U-Pb LA-ICP-MS 本文 晚志留世-早中泥盆世 双鹰山-花牛山弧 黄草滩 花岗闪长岩、闪长岩 394±7、402±3 锆石U-Pb LA-ICP-MS 王疆涛等, 2016 小泉东 花岗闪长岩 396±4 锆石U-Pb LA-ICP-MS 王怀涛, 2019 辉铜山东 二长花岗岩 397±7 SHRIMP 赵泽辉等, 2007 拾金坡 二长花岗岩 403±7 SHRIMP 胡朋, 2008 拾金坡 花岗岩 404.4±1.8 锆石U-Pb LA-ICP-MS Zhu et al., 2016 拾金坡 黑云母二长花岗岩 405.5±1.8 锆石U-Pb LA-ICP-MS 朱江, 2013 双峰山 正长花岗岩 415±3 锆石U-Pb LA-ICP-MS 李舢等, 2009 辉铜山 钾长花岗岩 418.5±4.4 锆石U-Pb LA-ICP-MS Zhu et al., 2016 辉铜山 钾长花岗岩 424.4±2.5 锆石U-Pb LA-ICP-MS 朱江, 2013 辉铜山东 花岗闪长岩 423±8 锆石U-Pb SHRIMP 赵泽辉等, 2007 柳园西南 花岗岩 424±4 锆石U-Pb LA-ICP-MS 毛启贵等, 2010 柳园东 钾长花岗岩 436±9 锆石U-Pb SHRIMP 赵泽辉等, 2007 石板山弧 金塔 钾长花岗岩 435±4 锆石U-Pb LA-ICP-MS 贺振宇等, 2014 桥湾 糜棱岩化花岗岩 433±4 锆石U-Pb LA-ICP-MS 贺振宇等, 2014 新元古代 石板山弧 小西弓 钾长花岗岩 841.3±8.1 锆石U-Pb LA-ICP-MS 朱江, 2013 石板墩 斜长花岗岩 850 锆石U-Pb LA-ICP-MS 周济元等, 2000 双鹰山-花牛山弧 古堡泉 糜棱岩化花岗闪长岩 880±31 锆石U-Pb LA-ICP-MS 梅华林等, 1999 古堡泉 花岗片麻岩 905±6、871±5、871±9 锆石U-Pb LA-ICP-MS Liu et al., 2015 古堡泉 眼球状花岗片麻岩 920±14 锆石U-Pb SHRIMP Saktura et al., 2017
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