The evolution of Changning-Menglian Ocean in the Qingping area of Shuangjiang County, western Yunnan: Constraints from age and geochemistry of plagioclase amphibolite
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摘要:
近年，昌宁-孟连结合带已获得了大量早古生代残余洋壳年龄及与之对应的弧岩浆记录，但晚古生代大洋演化相关的记录较少，缺乏高精度的年代学数据，制约了对昌宁-孟连洋演化的认识。通过对双江县清平地区2件斜长角闪岩LA-ICP-MS锆石U-Pb定年研究，获得206Pb/238U年龄加权平均值分别为442±3 Ma、410±6 Ma、365±6 Ma，其中410±6 Ma为继承年龄，其余代表岩浆结晶年龄。斜长角闪岩样品地球化学特征显示，SiO2含量为47.28%~48.18%，平均为47.90%，K2O/Na2O值小于1，具有富钠贫钾的特征。轻稀土元素富集，重稀土元素亏损，富集大离子亲石元素Ba，高场强元素Nb、Ta无明显的亏损，Ti、Zr呈弱的负异常，总体特征具富集型洋中脊玄武岩的性质。（87Sr/86Sr）t=0.705288~0.705750，（143Nd/144Nd）t=0.512373~0.512424，εNd（t）值为4.01~5.00，平均值4.72。Sr-Nd-Pb同位素组成表明，斜长角闪岩岩浆主要来源于富集型地幔（EMII）并具DUPAL异常的特征。综合分析认为，清平地区在442~365 Ma发育洋盆，表明昌宁-孟连结合带经历了原-古特提斯洋的演化过程。
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关键词:
- 斜长角闪岩 /
- 原-古特提斯 /
- 锆石U-Pb年龄 /
- Sr-Nd-Pb同位素 /
- 昌宁-孟连结合带
Abstract:A large number of data about ages of Early Paleozoic relict oceanic crust and corresponding arc magma records of the Changning-Menglian suture zone in recent years have been obtained.However, there are relatively few records related to the Late Paleozoic oceanic evolution and lack of high-precision chronological data, which severely constrains the understanding of the Changning-Menglian oceanic evolution.LA-ICP-MS zircon U-Pb dating of two plagioclase amphibolite samples in the Qingping region of Shuangjiang County yields the weighted average ages of 442±3 Ma, 410±6 Ma and 365±6 Ma respectively, of which 410±6 Ma is the inheritance age, and the rest represents the magmatic crystallization age.Geochemical characteristics show that the content of SiO2 is 47.28%~48.18% (sample D6164, t=365 Ma), averaging 47.90%, and the ratio of K2O/Na2O is less than 1, rich in sodium and poor in potassium.It is characterized by LREE enrichment, HREE depletion, enrichment of large ion lithophile element Ba, no obvious loss of high field strength elements of Nb and Ta, weak negative anomalies of Ti and Zr, indicating the overall characteristics of E-MORB.Sr-Nd-Pb isotopic compositions, (87Sr/86Sr)t=0.705288~0.705750, (143Nd/144Nd)t=0.512373~0.512424, εNd(t)=4.01~5.00, averaging 4.72, indicate that the magma source of amphibolite was mainly derived from the enriched mantle (EMII) with DUPAL anomaly.The comprehensive analysis shows that the ocean basin was developed in the period of 442~365 Ma in the Qingping area, and the Changning Menglian suture zone once experienced the evolution of Proto-Paleo Tethys Ocean.
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表 1 双江县清平地区斜长角闪岩LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb data of plagioclase amphibolites in the Qingping region, Shuangjiang County
测点号 含量/106 Th/U 同位素比值 年龄/Ma Th U 206Pb/207Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D5120 D5120-01 310 1887 0.16 0.0555 0.0011 0.5425 0.0111 0.0707 0.0006 432 46 440 7 440 3 D5120-02 204 510 0.40 0.0526 0.0015 0.5131 0.0158 0.0709 0.0010 309 67 421 11 441 6 D5120-03 293 368 0.80 0.0617 0.0019 1.1312 0.0390 0.1326 0.0027 665 65 768 19 802 15 D5120-04 408 392 1.04 0.0624 0.0016 0.9149 0.0250 0.1057 0.0011 687 54 660 13 648 6 D5120-05 392 457 0.86 0.0644 0.0016 0.9365 0.0244 0.1053 0.0009 754 54 671 13 645 5 D5120-06 84 710 0.12 0.0572 0.0014 0.5673 0.0185 0.0714 0.0015 498 54 456 12 444 9 D5120-07 286 596 0.48 0.0536 0.0021 0.2525 0.0095 0.0344 0.0004 354 89 229 8 218 2 D5120-08 1697 2092 0.81 0.0533 0.0018 0.2542 0.0081 0.0346 0.0004 343 76 230 7 219 2 D5120-09 48 529 0.09 0.0541 0.0025 0.2960 0.0139 0.0396 0.0006 376 73 263 11 250 4 D5120-10 204 327 0.62 0.0584 0.0028 0.5677 0.0260 0.0710 0.0010 543 110 457 17 442 6 D5120-11 304 1152 0.26 0.0496 0.0013 0.2341 0.0066 0.0342 0.0004 176 58 214 5 217 3 D5120-18 75 437 0.17 0.0539 0.0016 0.4622 0.0177 0.0614 0.0013 369 69 386 12 384 8 D5120-13 84 151 0.56 0.0544 0.0032 0.2540 0.0136 0.0348 0.0006 387 133 230 11 220 4 D5120-14 87 869 0.10 0.0524 0.0018 0.2862 0.0100 0.0396 0.0008 306 78 256 8 250 5 D5120-16 139 309 0.45 0.0576 0.0025 0.5748 0.0250 0.0720 0.0009 522 97 461 16 448 5 D5120-15 167 317 0.53 0.0605 0.0019 0.5928 0.0178 0.0707 0.0006 620 67 473 11 441 4 D5120-17 101 417 0.24 0.0735 0.0015 1.6254 0.0347 0.1591 0.0018 1028 73 980 13 952 10 D5120-12 102 1455 0.07 0.0559 0.0012 0.5562 0.0137 0.0715 0.0009 450 14 449 9 445 6 D5120-19 643 601 1.07 0.0568 0.0016 0.5598 0.0162 0.0711 0.0006 483 65 451 11 443 3 D5120-20 498 959 0.52 0.0526 0.0017 0.2516 0.0094 0.0343 0.0004 309 74 228 8 217 3 D6164 D6164-01 10 18 0.55 0.0642 0.0092 0.4385 0.0477 0.0589 0.0022 750 308 369 33.7 369 14 D6164-02 8 16 0.50 0.0675 0.0122 0.4863 0.0653 0.0595 0.0021 854 385 402 44.6 372 13 D6164-03 63 121 0.51 0.0535 0.0028 0.4832 0.0256 0.0667 0.0022 350 116 400 17.5 416 13 D6164-04 28 32 0.85 0.0616 0.0066 0.4753 0.0400 0.0577 0.0014 657 232 395 27.5 362 9 D6164-05 19 29 0.65 0.0616 0.0052 0.5502 0.0384 0.0658 0.0016 657 183 445 25.1 411 10 D6164-06 29 57 0.51 0.0499 0.0037 0.4330 0.0296 0.0638 0.0013 191 170 365 21.0 399 8 D6164-07 47 45 1.05 0.0560 0.0054 0.5703 0.0543 0.0723 0.0014 454 210 458 35.1 450 8 D6164-08 11 20 0.57 0.0643 0.0091 0.5029 0.0536 0.0664 0.0020 754 296 414 36.2 415 12 D6164-09 37 38 0.97 0.0519 0.0043 0.4404 0.0309 0.0643 0.0016 280 193 371 21.8 402 9 D6164-10 7 18 0.39 0.0522 0.0080 0.4479 0.0659 0.0658 0.0021 300 309 376 46.2 411 13 D6164-11 79 74 1.07 0.0551 0.0033 0.5141 0.0303 0.0672 0.0012 417 131 421 20.3 419 7 D6164-12 3 8 0.45 0.0799 0.0167 0.6458 0.1125 0.0903 0.0232 1194 422 506 69.4 557 137 D6164-13 13 25 0.51 0.0580 0.0073 0.4254 0.0476 0.0580 0.0019 532 280 360 33.9 364 12 D6164-14 20 41 0.50 0.0578 0.0048 0.4869 0.0379 0.0663 0.0027 520 183 403 25.9 414 17 D6164-15 31 50 0.61 0.0510 0.0049 0.4524 0.0426 0.0665 0.0015 243 225 379 29.8 415 9 D6164-16 20 20 1.01 0.0571 0.0075 0.4624 0.0539 0.0598 0.0018 494 293 386 37.4 375 11 D6164-17 17 19 0.92 0.0591 0.0071 0.4485 0.0465 0.0586 0.0018 569 265 376 32.6 367 11 D6164-18 21 24 0.86 0.0576 0.0074 0.4079 0.0394 0.0564 0.0015 522 281 347 28.4 354 9 D6164-19 68 102 0.67 0.0561 0.0034 0.4550 0.0282 0.0593 0.0009 457 132 381 19.7 372 5 D6164-20 46 81 0.56 0.0548 0.0032 0.4250 0.0242 0.0570 0.0010 406 99.1 360 17.2 358 6 D6164-21 24 42 0.58 0.0549 0.0053 0.4747 0.0413 0.0651 0.0013 409 218 394 28.4 407 8 
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表 2 双江县清平地区斜长角闪岩主量、微量和稀土元素分析结果
Table 2. Major, trace element and REE analyses of plagioclase amphibolites in the Qingping region, Shuangjiang County
样品号 D6164-H1 D6164-H2 D6164-H3 D6164-H4 D6164-H5 样品号 D6164-H1 D6164-H2 D6164-H3 D6164-H4 D6164-H5 SiO2 47.28 47.98 48.00 48.18 48.05 Nb 13.8 15.9 17.7 12.4 11.3 TiO2 2.07 2.33 2.69 1.98 1.87 Cs 0.19 0.26 0.58 0.45 0.37 Al2O3 14.41 15.33 15.88 15.82 15.99 Ba 92.3 134 120 119 188 TFeO 12.84 12.18 13.57 13.10 13.12 La 12.9 14.7 15.2 13.4 12.1 MnO 0.20 0.20 0.21 0.22 0.21 Ce 31.7 37.2 38.8 33.5 25.8 MgO 7.81 6.40 5.19 5.60 5.88 Pr 4.44 5.38 5.51 4.76 4.20 CaO 11.09 10.10 8.44 9.34 9.68 Nd 21.7 26.1 26.9 22.8 19.8 Na2O 2.79 3.34 4.02 3.81 3.37 Sm 6.27 6.81 7.35 6.00 5.29 K2O 0.32 0.34 0.38 0.40 0.41 Eu 2.82 2.23 2.36 1.95 1.88 P2O5 0.21 0.29 0.36 0.33 0.24 Gd 7.36 7.68 8.31 6.77 6.71 烧失量 0.90 0.80 0.89 1.32 1.40 Tb 1.29 1.25 1.35 1.07 1.11 总计 99.91 99.28 99.63 100.11 100.21 Dy 7.78 7.62 8.38 6.61 7.10 Sc 45.2 37.0 35.5 33.6 42.9 Ho 1.54 1.51 1.64 1.36 1.44 V 370 307 351 309 309 Er 4.27 4.15 4.47 3.68 4.03 Cr 96.1 80.7 39.8 36.3 49.1 Tm 0.59 0.55 0.60 0.52 0.54 Co 35.5 41.6 45.1 42.2 41.2 Yb 3.85 3.53 3.89 3.34 3.53 Ni 71.6 50.7 40.9 39.2 43.0 Lu 0.55 0.53 0.59 0.50 0.53 Ga 21.0 20.1 22.1 20.5 20.4 Hf 3.25 3.37 3.40 2.81 3.12 Rb 3.73 5.00 7.03 6.81 6.57 Ta 0.70 0.86 1.00 0.67 0.67 Sr 216 323 298 357 312 Pb 1.39 1.72 2.68 5.22 5.10 Y 42.3 41.5 45.7 38.0 43.7 Th 0.36 0.22 0.22 0.36 0.19 Zr 111 112 108 91.3 102 U 0.19 0.10 0.09 0.11 0.07 注：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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表 3 双江县清平斜长角闪岩Sr-Nd-Pb同位素组成
Table 3. Sr-Nd-Pb isotopic composition of plagioclase amphibolites in the Qingping region, Shuangjiang County
样品 D6164-H1 D6164-H2 D6164-H3 D6164-H4 D6164-H5 样品 D6164-H1 D6164-H2 D6164-H3 D6164-H4 D6164-H5 206Pb/204Pb 18.772 18.610 18.525 18.550 18.518 87Rb/86Sr 0.050 0.045 0.068 0.055 0.061 207Pb/204Pb 15.745 15.758 15.741 15.748 15.741 87Sr/86Sr 0.705849 0.705835 0.706104 0.705726 0.705604 208Pb/204Pb 38.990 38.972 38.873 38.934 38.878 (87Sr/86Sr)t 0.705589 0.705603 0.705750 0.705439 0.705288 (206Pb/204Pb)t 18.259 18.393 18.400 18.471 18.466 Sm/10-6 6.27 6.81 7.35 6.00 5.29 (207Pb/204Pb)t 15.718 15.746 15.735 15.744 15.738 Nd/10-6 21.69 26.11 26.91 22.81 19.75 (208Pb/204Pb)t 38.676 38.817 38.774 38.851 38.833 147Sm/144Nd 0.1749 0.1577 0.1651 0.1590 0.1620 △7/4Pb 21.9657 24.9571 24.2265 24.6202 24.2879 143Nd/144Nd 0.512842 0.512797 0.512815 0.512753 0.512797 △8/4Pb 66.8514 84.5058 84.9155 88.0477 86.3261 (143Nd/144Nd)t 0.512424 0.512420 0.512420 0.512373 0.512410 Rb/10-6 3.73 5.00 7.03 6.81 6.57 εNd(t) 5.00 4.92 4.93 4.01 4.72 Sr/10-6 216 323 298 357 312 注：εNd(t)值根据t＝365 Ma计算；(143Nd/144Nd)t=(143Nd/144Nd)sample－(147Sm/144Nd)m×(eλt-1)；εNd(t)=[(143Nd/144Nd)t /(143Nd/144Nd)CHUR(t)-1]×104; (143Nd/144Nd)CHUR(t)=0.512638- 0.1967×(eλt -1)。λSm-Nd=6.54×10-12 a-1。△7/4Pb=[(207Pb/204Pb)样品-0.1084(206Pb/204Pb)样品-13.491]×100；△8/4Pb=[(208Pb/204Pb)样品-1.209(206Pb/204Pb)样品-15.627]×100
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① 云南省地质调查院.1∶25万临沧县幅,滚龙幅区域地质调查报告.2003.
② 云南省地质调查院.1∶25万凤庆县幅区域地质调查报告.2008.
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