Subduction-Type Magmatic Rocks in Post-Collision Stage: Evidence from Late Triassic Diorite-Porphyrite of Naomuhungou Area, East Kunlun Orogen
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摘要: 位于青蔵高原东北部的东昆仑造山带在晚二叠世到晚三叠世时期形成了大规模壳幔混合成因的花岗岩类,是研究壳幔相互作用和陆壳生长-再循环的理想场所.对该造山带的瑙木浑沟闪长玢岩岩体开展了详细的岩相学、LA-ICP-MS锆石U-Pb同位素年代学、矿物化学、岩石地球化学和Sr-Nd同位素的研究.结果显示,瑙木浑沟闪长玢岩形成年龄为215.6±3.4 Ma,属于晚三叠世岩浆作用的产物.斑晶主要由斜长石和角闪石构成,斜长石斑晶为中长石和少量拉长石,并具有正环带和反环带两种类型,角闪石斑晶属于浅闪石.闪长玢岩具有准铝质到弱过铝质、相对富Mg#(~51.2)和中-高钾钙碱性特点,轻稀土元素相对富集,重稀土元素相对亏损,富集Rb、Th、Ba和K等大离子亲石元素,亏损Nb、Ta和Ti等高场强元素,具有明显陆缘弧岩浆活动的特征.此外,岩石具有均一的ISr值(0.708 6~0.708 8)和相对较低εNd(t)(-5.3~-4.8),并具有相对较古老的模式年龄TDM2(1.38~1.43 Ga).上述矿物学和地球化学特征说明,闪长玢岩可能起源于富集的岩石圈地幔部分熔融形成的幔源岩浆上涌引发古老地壳熔融,并与壳源熔体均匀混合形成母岩浆,形成方式具有明显的MASH特征.结合区域地质研究,认为瑙木浑沟闪长玢岩可能形成于阿尼玛卿洋俯冲至晚期并向大陆碰撞的转换阶段,可能代表了巴颜克拉-松潘甘孜-东昆仑地体拼合的岩浆延迟反应产物.这对于理解造山带背景下从洋壳俯冲到陆-陆碰撞以及后碰撞过程的陆壳增长过程至关重要.Abstract: The East Kunlun orogenic belt in the northeast of Qinghai-Tibet plateau contains large-scale crust-mantle mixed granitoid in the Late Permian and Late Triassic periods. It is an ideal region to investigate crust-mantle mixing and continental crust growth-recycling.In this paper, detailed petrography, LA-ICP-MS zircon U-Pb isotopic geochronology, mineral chemistry, rock geochemistry and Sr-Nd isotopes from the Naomuhungou diorite-porphyrites are reported. Zircon U-Pb ages indicate that the diorite-porphyrites were emplaced at~215.4±3.6 Ma.Plagioclase phenocrysts mainly comprise andesine and a small amount of labradorite, characterized by normal zoning and reverse zoning texture. Amphibole phenocrysts belong to the endenite. Naomuhungou diorite-porphyrites are characterized by the metaluminous to peraluminous, relatively rich in magnesium (Mg#~51.2) and middle K-high K calc-alkaline. The rock samples display marked enrichment in LREE and LILE (e. g. Rb, Th, U and K), and depleted in some HREE and HFSE (e.g., Nb, Ta, Ti), showing affinities similar to continental arc granites. In addition, the rocks have a homogeneous ISr value (0.708 6-0.708 8) and relatively low εNd(t) ((-5.3)-(-4.8)), and have a relatively older model age of TDM2 (1.38-1.43 Ga). The above mineralogical and geochemical characteristics suggest that diorite-porphyrite might originate from the enriched mantle-derived magmatic underplating of the ancient basement crust and homogeneous mixing with crustal melts, with obvious MASH features. In combination with regional geology studies, it is concluded that the Naomuhungou diorite-porphyrites may have formed during the transitional period of Late A'nemaqen Paleo-Tethys ocean subduction and collision with the continent, and may represent the post-magmatic-response to the suturing of the Bayan Har-Songpan-Ganzi-East Kunlun terrane.This study is also helpful for understanding the origin of the continental crustal accretion through magmatism in the broad context of orogenesis from seafloor subduction to continental collision and to post-collisional processes.
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Key words:
- East Kunlun /
- Naomuhungou /
- geochronology /
- geochemistry /
- diorite-porphyrite /
- Late Triassic /
- magma mixing
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图 1 青藏高原构造轮廓图(a),东昆仑东段地质简化图(b)和瑙木浑沟闪长玢岩岩体简化图(c)
图a据Roger et al.(2008); Xiong et al.(2012)修改; 图b据Xia et al.(2014)修改
Fig. 1. Tectonic outline of the Tibetan plateau showing the study area (a), simplified geological map of the eastern part of the EKOB (b) and geological map of the Nuomuhonggou area (c)
图 5 长石Or-Ab-An分类类图解(a)和角闪石成分分类图解(b)
Fig. 5. The Or-Ab-An diagram of feldspar (a) and compositional classification for amphiboles (b)
图 6 瑙木浑沟闪长玢岩主量元素判别图解
a.TAS判别图解,据Middlemost(1994); b.SiO2-K2O判别图解,据Peccerillo and Taylor(1976); c.A/NK-A/CNK判别图解,据Peccerillo and Taylor(1976)
Fig. 6. Major element discrimination diagrams for the Nuomuhungou diorite-porphyrites
图 7 瑙木浑沟闪长玢岩球粒陨石标准化稀土元素模式(a)和原始地幔标准化微量元素蛛网图(b)
球粒陨石标准化值和原始地幔标准化值据Sun and McDonough(1989)
Fig. 7. Chondrite-normalized REE distribution pattern (a) and primitive mantle-normalized trace element spider diagram of Nuomuhungou (b)
图 8 瑙木浑沟Sr/Y-Y(a)和YbN-(La/Yb)N图解(b)
Fig. 8. Sr/Y-Y (a) and YbN-(La/Yb)N (b) diagrams of Naomuhungou
图 10 瑙木浑沟闪长玢岩(87Sr/86Sr)i-εNd(t)(a)和侵入岩年龄-εNd(t) (b)图解
图a底图据Xiong et al.(2012); 图b资料引自Liu et al.(2008)、Xiong et al.(2012)和Chen et al.(2015)
Fig. 10. (87Sr/86Sr)i-εNd(t) (a) and intrusive age (b) diagrams of Naomuhungou diorite-porphyrites
图 11 瑙木浑沟闪长玢岩CaO-Sr (a)和Zr/Sm-Nb/Ta(b)图解
图a底图据He et al.(2011); 图b据Xiong et al.(2005)
Fig. 11. Sr-CaO (a) and Zr/Sm-Nb/Ta (b) diagrams of the Naomuhungou diorite-porphyrites
图 13 角闪石成因图解(a)和Al2O3-TiO2(b)
图a底图据姜长义和安三元(1984); 图b底图据陈光远等(1993).Ⅰ.岩浆成因区; Ⅱ.接触交代成因区; Ⅲ.区域副变质成因区
Fig. 13. The genesis of hornblende plots (a) and Al2O3-TiO2 (b)
图 14 壳幔混合作用的不同阶段的岩石学响应
Fig. 14. The lithological response at different stages of the mixing of crust and mantle
图 16 瑙木浑沟闪长玢岩Nb*-Ta*图解
修改自Shao et al.(2017).东昆仑瑙木浑沟闪长玢岩落入靠近大陆地壳区域(BCC: Rudnick and Gao, 2003),低于幔源熔体(过碱性流纹岩数据引自澳大利亚东部,Shao et al., 2015),Nb*=(Nb/Th)PM,Ta*=(Ta/U)PM,平均地壳组成(BCC,LCC,UCC)引自Rudnick and Gao(2003); 原始地幔和洋岛玄武岩(PM,E-MORB,N-MORB)引自Sun and McDonough(1989)
Fig. 16. Nb*-Ta* diagram of Naomuhungou diorite-porphyrites
表 1 闪长玢岩中锆石LA-ICP-MS U-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Pb ages of diorite-porphyrites
测试点号 (10-6) Th/U 同位素比值 年龄(Ma) Pb Th U 207Pb/235Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ ZH01-4-01 64.52 451.54 597.09 0.76 0.053 879 0.002 552 0.245 905 0.010 845 0.034 011 0.000 546 364.9 112.0 223.2 9.9 215.6 8.8 ZH01-4-02 81.75 581.56 802.22 0.72 0.050 489 0.002 351 0.230 561 0.010 566 0.033 541 0.000 491 216.7 107.4 210.7 8.5 212.7 8.7 ZH01-4-03 60.42 425.18 570.40 0.75 0.053 046 0.003 068 0.244 767 0.013096 0.034 480 0.000 545 331.5 131.5 222.3 11.3 218.5 10.7 ZH01-4-04 67.88 463.26 724.08 0.64 0.050 691 0.002 208 0.236 582 0.009 994 0.034220 0.000 474 233.4 100.0 215.6 8.6 216.9 8.2 ZH01-4-05 58.04 446.70 537.25 0.83 0.052 652 0.003 061 0.244 852 0.012901 0.034673 0.000 640 322.3 133.3 222.4 10.7 219.7 10.5 ZH01-4-06 41.73 241.38 406.38 0.59 0.062 116 0.004 318 0.291 916 0.018 024 0.035 363 0.000 626 679.6 150.0 260.1 14.2 224.0 14.2 ZH01-4-07 28.66 192.08 284.19 0.68 0.054 543 0.004 150 0.234 657 0.015116 0.033 702 0.000 703 394.5 176.8 214 14.3 213.7 12.4 ZH01-4-08 26.08 180.33 231.47 0.78 0.053 979 0.004 542 0.240 833 0.018 067 0.034 765 0.000 794 368.6 190.7 219.1 16.2 220.3 14.8 ZH01-4-09 30.81 191.21 296.54 0.64 0.059 589 0.004 112 0.283 055 0.017 804 0.034 802 0.000 673 587.1 150.0 253.1 14.2 220.5 14.1 ZH01-4-10 56.44 403.73 528.89 0.76 0.050 558 0.002 666 0.243 025 0.012 890 0.034 899 0.000 619 220.4 122.2 220.9 10.1 221.1 10.5 ZH01-4-11 56.17 445.76 405.46 1.10 0.054 072 0.003 471 0.252 331 0.015 749 0.034 550 0.000 489 372.3 144.4 228.5 15.0 219.0 12.8 ZH01-4-12 55.16 395.37 641.18 0.62 0.056 100 0.003 013 0.258 025 0.012 728 0.033 972 0.000 541 457.5 120.4 233.1 10.4 215.4 10.3 ZH01-4-13 41.62 290.34 489.18 0.59 0.050 171 0.003 114 0.227 759 0.012 580 0.033 890 0.000 687 211.2 144.4 208.3 10.2 214.8 10.6 ZH01-4-14 26.63 159.29 291.59 0.55 0.053 124 0.003 712 0.251 953 0.015 216 0.035 419 0.000 474 344.5 157.4 228.2 13.1 224.4 12.3 ZH01-4-15 46.16 355.19 487.59 0.73 0.050 784 0.003 155 0.234 112 0.012 767 0.033 757 0.000 548 231.6 144.4 213.6 10.5 214.0 10.5 ZH01-4-16 39.04 263.55 457.77 0.58 0.050 893 0.003 394 0.247 758 0.015 176 0.035 593 0.000 572 235.3 153.7 224.8 12.1 225.5 12.4 ZH01-4-17 58.33 379.31 465.90 0.81 0.062 044 0.000 481 0.300 472 0.020 569 0.035 963 0.000 686 675.9 165.6 266.8 19.3 227.8 16.1 ZH01-4-18 21.99 129.83 223.38 0.58 0.060 845 0.004 657 0.290 284 0.021 313 0.035 669 0.000 736 635.2 164.8 258.8 17.2 225.9 16.8 ZH01-4-19 46.33 286.83 466.26 0.62 0.052 814 0.003 530 0.253 277 0.014 921 0.036 148 0.000 652 320.4 151.8 229.2 11.9 228.9 12.1 ZH01-4-20 73.32 563.70 640.88 0.88 0.054 819 0.003 389 0.257 697 0.015 393 0.034 376 0.000 570 405.6 138.9 232.8 11.9 217.9 12.4 表 2 瑙木浑沟闪长玢岩中斜长石成分(%)
Table 2. Electron-microprobe compositions of plagioclase from the diorite-porphyrites at Naomuhungou
点号 SiO2 TiO2 Al2O3 FeO MnO MgO CaO BaO Na2O K2O Total Si Al Ca Na K An Ab Or 01 60.55 - 25.22 0.17 0.02 0.01 7.32 0.03 6.87 0.54 100.73 2.683 2 1.316 8 0.347 6 0.590 0 0.001 0 35.91 60.95 3.15 02 58.64 - 25.94 0.18 - 0.01 7.96 - 6.48 0.48 99.74 2.631 6 1.372 2 0.382 7 0.564 1 - 39.27 57.89 2.84 03 59.25 - 25.65 0.21 0.02 0.00 7.99 - 6.47 0.49 100.09 2.648 1 1.351 3 0.382 8 0.560 3 - 39.42 57.69 2.89 04 59.55 - 26.00 0.17 0.02 0.01 8.05 0.01 6.54 0.45 100.83 2.641 9 1.359 7 0.382 6 0.562 5 0.000 4 39.43 57.97 2.61 05 58.78 - 26.16 0.20 0.01 0.02 8.58 - 6.23 0.51 100.48 2.621 8 1.375 2 0.409 8 0.538 9 0.000 0 41.93 55.13 2.94 06 58.48 0.00 26.34 0.22 - 0.02 8.77 0.03 6.14 0.42 100.46 2.611 4 1.386 1 0.419 6 0.531 9 0.001 2 43.02 54.53 2.45 07 57.58 0.02 26.71 0.16 0.03 0.01 8.87 0.08 6.02 0.42 99.90 2.587 8 1.414 7 0.427 0 0.524 2 0.002 7 43.79 53.77 2.45 08 57.17 0.03 26.58 0.22 0.00 0.01 9.03 0.09 6.05 0.18 99.35 2.583 7 1.415 8 0.437 2 0.530 0 0.003 0 44.74 54.23 1.04 09 55.69 0.01 28.52 0.32 0.02 0.04 10.73 0.08 4.99 0.28 100.67 2.497 9 1.507 9 0.515 8 0.434 2 0.002 9 53.40 44.95 1.65 10 55.77 0.01 28.53 0.31 0.02 0.03 11.08 0.06 4.85 0.35 101.02 2.495 3 1.504 5 0.531 0 0.420 9 0.002 1 54.63 43.30 2.07 11 55.62 0.04 28.64 0.37 0.01 0.02 10.89 0.06 4.81 0.31 100.80 2.493 7 1.513 4 0.523 4 0.418 3 0.002 0 54.54 43.59 1.87 12 52.35 0.03 30.14 0.35 0.00 0.04 13.37 0.01 3.53 0.15 99.98 2.381 8 1.616 3 0.651 9 0.311 6 0.000 3 67.06 32.05 0.89 13 56.48 0.01 28.12 0.39 0.02 0.04 10.87 0.04 4.85 0.25 101.07 2.521 5 1.479 5 0.519 9 0.420 2 0.001 4 54.48 44.44 1.48 14 52.88 - 30.12 0.39 0.01 0.03 13.02 0.03 3.46 0.16 100.12 2.397 8 1.609 7 0.632 5 0.304 2 0.001 0 66.85 32.15 1.00 15 51.93 0.02 30.99 0.39 0.02 0.04 14.40 0.06 3.09 0.12 101.09 2.344 8 1.649 4 0.696 8 0.270 2 0.002 0 71.54 27.74 0.72 16 50.13 0.02 31.78 0.39 0.02 0.03 14.78 0.08 2.71 0.16 100.09 2.291 1 1.712 1 0.723 6 0.240 1 0.002 8 74.36 24.67 0.97 17 54.48 0.01 29.16 0.30 - 0.02 12.14 0.06 4.10 0.25 100.53 2.453 2 1.547 3 0.585 8 0.357 5 0.002 2 61.18 37.34 1.48 18 57.47 - 27.39 0.27 - 0.04 9.72 - 5.51 0.36 100.75 2.563 5 1.439 9 0.464 7 0.476 7 0.000 0 48.31 49.56 2.12 19 57.49 0.00 27.32 0.30 0.02 0.05 9.88 0.04 5.71 0.29 101.12 2.560 8 1.434 2 0.471 5 0.493 4 0.001 3 48.03 50.26 1.70 20 58.08 0.01 27.13 0.28 0.00 0.03 9.76 0.07 5.62 0.30 101.29 2.577 7 1.419 2 0.464 3 0.483 5 0.002 4 48.11 50.10 1.78 21 58.32 - 26.90 0.28 0.01 0.02 9.37 0.06 5.75 0.40 101.11 2.590 7 1.408 4 0.446 2 0.494 9 0.002 0 46.30 51.35 2.35 注: “-”表示低于检测限. 表 3 瑙木浑沟闪长玢岩中角闪石成分(%)
Table 3. Electron-microprobe compositions of hornblende from the diorite-porphyrites at Naomuhungou
样品号 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 SiO2 44.44 44.84 45.38 45.76 44.18 45.13 44.60 47.04 45.28 45.54 45.80 45.73 45.36 45.05 45.10 TiO2 2.46 2.37 2.24 1.64 2.41 2.28 2.37 1.74 2.25 2.23 2.01 2.09 2.05 2.26 2.36 Al2O3 9.26 8.88 8.82 8.05 8.89 8.97 9.33 7.60 8.87 9.08 8.98 8.70 8.88 9.18 9.04 FeO 13.78 13.79 13.82 14.43 14.15 14.31 13.74 13.60 13.77 13.99 14.49 14.45 14.39 13.55 13.56 MnO 0.17 0.17 0.22 0.24 0.23 0.20 0.21 0.26 0.18 0.24 0.21 0.22 0.26 0.23 0.20 MgO 13.30 13.08 13.55 13.42 13.07 12.96 13.45 14.13 13.68 13.03 13.01 13.03 13.15 13.56 13.42 CaO 10.73 11.04 10.86 10.84 10.79 10.97 11.02 10.81 10.90 10.85 11.00 10.89 10.89 10.94 10.83 NiO 0.02 0.04 - 0.02 0.03 0.02 0.04 0.04 0.03 0.06 0.03 0.06 0.06 0.00 0.02 BaO 0.04 0.04 0.08 0.00 0.08 0.09 0.07 0.02 0.03 0.04 0.01 0.11 0.10 0.01 - Na2O 2.03 1.83 1.85 1.68 1.85 2.02 1.93 1.74 1.96 1.94 1.87 1.90 1.84 2.05 2.00 K2O 0.51 0.52 0.56 0.53 0.51 0.54 0.50 0.44 0.50 0.51 0.53 0.51 0.54 0.52 0.52 Total 96.73 96.59 97.37 96.61 96.19 97.46 97.25 97.42 97.45 97.50 97.93 97.69 97.52 97.34 97.05 Si 6.63 6.69 6.71 6.83 6.65 6.69 6.62 6.92 6.69 6.73 6.75 6.76 6.72 6.66 6.69 AlⅣ 1.37 1.31 1.29 1.17 1.35 1.31 1.38 1.08 1.31 1.27 1.25 1.24 1.28 1.34 1.31 AlⅥ 0.26 0.26 0.25 0.25 0.22 0.26 0.25 0.24 0.24 0.31 0.31 0.28 0.28 0.26 0.27 Ti 0.28 0.27 0.25 0.18 0.27 0.25 0.26 0.19 0.25 0.25 0.22 0.23 0.23 0.25 0.26 Fe3+ 0.38 0.43 0.41 0.43 0.39 0.39 0.38 0.48 0.39 0.44 0.43 0.43 0.41 0.37 0.40 Fe2+ 1.34 1.29 1.30 1.37 1.39 1.38 1.33 1.19 1.31 1.29 1.35 1.35 1.37 1.30 1.28 Mn 0.02 0.02 0.03 0.03 0.03 0.02 0.03 0.03 0.02 0.03 0.03 0.03 0.03 0.03 0.02 Mg 2.96 2.91 2.99 2.99 2.93 2.87 2.98 3.10 3.01 2.87 2.86 2.87 2.91 2.99 2.97 Ca 1.71 1.77 1.72 1.73 1.74 1.74 1.75 1.70 1.73 1.72 1.74 1.72 1.73 1.73 1.72 Na 0.59 0.53 0.53 0.49 0.54 0.58 0.56 0.50 0.56 0.56 0.53 0.55 0.53 0.59 0.58 K 0.10 0.10 0.10 0.10 0.10 0.10 0.09 0.08 0.09 0.10 0.10 0.10 0.10 0.10 0.10 SiT 6.63 6.69 6.71 6.83 6.65 6.69 6.62 6.92 6.69 6.73 6.75 6.76 6.72 6.66 6.69 AlT 1.37 1.31 1.29 1.17 1.35 1.31 1.38 1.08 1.31 1.27 1.25 1.24 1.28 1.34 1.31 AlC 0.26 0.26 0.25 0.25 0.22 0.26 0.25 0.24 0.24 0.31 0.31 0.28 0.28 0.26 0.27 FeC3+ 0.38 0.43 0.41 0.43 0.39 0.39 0.38 0.48 0.39 0.44 0.43 0.43 0.41 0.37 0.40 TiC 0.28 0.27 0.25 0.18 0.27 0.25 0.26 0.19 0.25 0.25 0.22 0.23 0.23 0.25 0.26 MgC 2.96 2.91 2.99 2.99 2.93 2.87 2.98 3.10 3.01 2.87 2.86 2.87 2.91 2.99 2.97 FeC2+ 1.14 1.14 1.09 1.15 1.19 1.23 1.13 0.99 1.11 1.13 1.18 1.18 1.18 1.12 1.10 FeB2+ 0.21 0.16 0.20 0.22 0.21 0.16 0.20 0.20 0.21 0.16 0.17 0.17 0.19 0.18 0.18 MnB 0.02 0.02 0.03 0.03 0.03 0.02 0.03 0.03 0.02 0.03 0.03 0.03 0.03 0.03 0.02 CaB 1.71 1.77 1.72 1.73 1.74 1.74 1.75 1.70 1.73 1.72 1.74 1.72 1.73 1.73 1.72 NaB 0.06 0.06 0.05 0.02 0.03 0.07 0.02 0.06 0.04 0.09 0.07 0.08 0.04 0.06 0.08 NaA 0.53 0.47 0.48 0.47 0.51 0.51 0.53 0.43 0.52 0.46 0.47 0.47 0.49 0.53 0.50 KA 0.10 0.10 0.10 0.10 0.10 0.10 0.09 0.08 0.09 0.10 0.10 0.10 0.10 0.10 0.10 注: “-”表示低于检测限. 表 4 瑙木浑沟闪长玢岩全岩主量元素(%)、微量元素(10-6)成分
Table 4. Whole rock major (%) and trace element (10-6) contents of the Naomuhungou diorite-porphyrites
样品 ZH01-1 ZH01-2 ZH01-3 ZH01-4 ZH01-5 ZH01-6 ZH01-7 ZH01-8 ZH01-9 ZH01-10 ZH01-11 ZH01-12 ZH01-13 主量元素(%) SiO2 58.20 58.86 58.38 59.98 59.14 60.74 60.89 60.76 62.54 62.77 64.91 63.68 64.93 TiO2 0.69 0.69 0.67 0.70 0.72 0.65 0.64 0.65 0.61 0.60 0.64 0.60 0.65 Al2O3 16.98 17.01 17.1 16.52 16.37 16.26 15.96 16.12 16.42 16.36 16.17 16.44 16.12 Fe2O3T 5.97 5.96 5.9 5.58 5.75 5.12 5.02 5.08 5.08 4.96 4.87 4.89 5.21 MnO 0.08 0.09 0.08 0.11 0.10 0.09 0.08 0.08 0.11 0.09 0.09 0.08 0.07 MgO 2.94 2.54 2.72 2.96 3.34 2.86 2.44 2.31 2.39 2.54 1.49 2.11 1.38 CaO 5.21 5.69 5.6 6.23 5.69 4.97 5.38 5.74 5.04 4.20 3.91 3.44 3.84 Na2O 3.03 3.14 3.12 2.95 3.15 3.25 3.11 3.11 3.22 3.57 3.85 4.78 3.80 K2O 1.73 1.85 1.72 1.80 1.68 2.15 2.00 1.86 2.22 2.58 2.79 2.53 3.03 P2O5 0.18 0.18 0.18 0.18 0.18 0.18 0.17 0.27 0.16 0.15 0.19 0.16 0.19 LOI 3.94 4.23 3.47 2.40 2.75 2.73 3.41 3.00 2.40 2.55 1.16 1.25 0.81 Total 98.95 100.24 98.94 99.41 98.87 99.00 99.10 98.98 100.19 100.37 100.07 99.96 100.03 Mg# 53.4 49.8 51.8 55.3 57.5 56.6 53.1 51.5 52.3 54.4 41.6 50.1 38.2 微量元素(10-6) Li 37.15 36.20 26.07 7.81 17.90 18.60 15.41 11.09 14.80 13.50 32.10 25.00 17.00 Be 1.53 1.58 1.58 1.54 1.55 1.53 1.71 1.67 1.31 1.39 1.99 1.47 2.10 Sc 15.34 14.86 15.40 13.75 14.90 11.64 11.37 11.12 9.00 9.50 7.90 10.50 9.00 V 108.92 107.58 108.77 99.60 109.14 83.02 81.42 80.96 89.00 77.00 63.00 85.00 64.00 Cr 15.62 17.24 11.99 30.05 31.75 22.90 23.28 23.75 30.00 30.00 20.00 30.00 20.00 Co 12.18 11.62 12.67 13.28 14.11 11.36 11.86 12.00 10.20 9.70 8.40 10.10 8.80 Ni 6.57 7.16 6.55 10.75 10.71 9.45 9.67 10.00 7.60 6.40 3.20 6.80 3.60 Cu 14.27 15.30 16.07 13.55 17.07 13.82 15.42 15.63 12.40 12.20 17.60 12.80 76.30 Zn 63.98 67.74 66.89 79.39 68.85 67.83 65.28 68.22 92.00 78.00 90.00 69.00 60.00 Ga 18.82 18.99 18.95 19.53 19.72 19.15 19.37 18.97 18.60 18.40 20.90 19.20 20.80 Rb 46.22 50.70 48.73 42.15 41.97 56.34 47.89 32.29 68.40 62.00 110.00 76.10 115.50 Sr 442.19 465.36 492.9 518.15 532.48 500.86 590.37 573.55 486.00 508.00 493.00 592.00 497.00 Y 14.34 14.86 15.31 15.86 16.44 14.35 15.49 14.97 16.50 15.10 18.10 16.10 20.80 Zr 139.10 139.89 141.27 138.31 152.52 152.04 179.65 178.48 215.00 203.00 199.00 222.00 223.00 Nb 7.26 7.29 7.16 8.23 8.88 8.50 9.26 9.03 9.10 8.70 10.40 9.10 11.50 Sn 1.12 1.10 1.20 1.10 1.10 1.20 1.30 1.30 2.00 2.00 3.00 2.00 3.00 Cs 14.39 10.96 13.01 1.33 2.83 1.78 1.30 0.57 1.99 1.50 7.04 10.20 7.64 Ba 554.25 593.16 595.78 666.27 681.75 684.34 771.30 773.11 755.00 823.00 827.00 849.00 749.00 La 23.03 22.97 23.19 27.55 27.10 27.78 30.20 29.64 32.90 30.80 32.40 32.70 35.10 Ce 44.43 44.81 44.39 53.12 53.73 53.76 58.58 57.22 63.70 59.40 63.60 63.00 71.80 Pr 4.97 5.07 5.03 5.96 6.06 6.09 6.54 6.47 7.13 6.47 7.35 6.79 8.04 Nd 19.04 19.25 18.90 22.51 23.03 22.26 24.38 24.28 25.80 23.40 26.30 24.70 29.30 Sm 3.37 3.42 3.37 4.22 4.41 4.07 4.43 4.10 4.88 4.39 5.21 4.69 5.75 Eu 1.08 1.07 1.10 1.21 1.2 1.12 1.22 1.19 1.32 1.13 1.27 1.18 1.39 Gd 2.89 3.03 3.02 3.55 3.47 3.14 3.40 3.40 3.82 3.45 4.05 3.77 4.74 Tb 0.46 0.47 0.49 0.56 0.58 0.50 0.53 0.54 0.53 0.51 0.59 0.50 0.65 Dy 2.68 2.64 2.81 3.03 3.15 2.78 2.85 2.8 3.24 2.90 3.46 3.08 3.96 Ho 0.51 0.52 0.55 0.59 0.6 0.53 0.54 0.53 0.56 0.52 0.59 0.54 0.68 Er 1.48 1.56 1.55 1.59 1.68 1.48 1.51 1.49 1.77 1.63 1.77 1.70 2.10 Tm 0.21 0.22 0.24 0.24 0.25 0.21 0.24 0.23 0.26 0.22 0.26 0.24 0.32 Yb 1.35 1.43 1.5 1.49 1.52 1.27 1.40 1.34 1.68 1.57 1.67 1.57 1.99 Lu 0.23 0.23 0.25 0.23 0.24 0.21 0.22 0.22 0.26 0.24 0.27 0.26 0.31 Hf 3.41 3.59 3.59 3.74 4.12 4.12 4.65 4.53 5.30 5.20 4.90 5.40 5.70 Ta 0.43 0.44 0.43 0.53 0.59 0.59 0.62 0.59 0.70 0.60 0.80 0.70 0.90 Tl 0.29 0.38 0.34 0.35 0.30 0.33 0.32 0.27 0.27 0.33 0.56 0.32 0.50 Pb 11.62 11.12 13.07 46.59 13.46 16.48 12.99 16.22 22.50 20.10 32.50 15.60 9.70 Th 4.65 4.77 4.77 7.10 7.03 7.46 7.64 7.32 9.46 8.66 12.10 9.04 12.75 U 0.96 1.02 1.02 1.81 1.70 1.82 1.85 1.73 2.13 1.99 3.54 2.13 3.85 ∑REE 105.27 106.22 105.9 125.29 126.44 124.7 135.51 132.91 147.32 136.12 148.20 144.22 165.48 (La/Yb)N 12.24 11.52 11.09 13.26 12.79 15.69 15.47 15.87 14.05 14.07 13.92 14.94 12.65 δEu 1.03 0.99 1.03 0.93 0.91 0.92 0.92 0.95 0.90 0.86 0.81 0.83 0.79 注: Mg#=MgO/(MgO+FeO). 表 5 瑙木浑沟闪长玢岩全岩Sr-Nd同位素成分
Table 5. Whole rock Sr-Nd isotopic compositions of the Naomuhungou diorite-porphyrites
样品 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i Sm(10-6) Nd(10-6) 147Sm/144Nd 143Nd/144Nd 2σ (143Nd/144Nd)i εNd(t) t ZH01-1 46.22 442.19 0.294 957 0.709 559 0.000 018 0.708 653 3.37 19.04 0.112 108 0.512 098 0.000 012 0.512 360 -5.1 216 ZH01-2 50.70 465.36 0.307 578 0.709 584 0.000 020 0.708 639 3.42 19.25 0.111 872 0.512 114 0.000 015 0.512 360 -4.8 216 ZH01-4 42.15 518.15 0.229 650 0.709 312 0.000 013 0.708 607 4.22 22.51 0.124 370 0.512 087 0.000 047 0.512 360 -5.3 216 ZH01-7 47.89 590.37 0.158 935 0.709 302 0.000 013 0.708 814 4.43 24.38 0.106 961 0.512 112 0.000 008 0.512 360 -4.8 216 注: ISr=[(87Sr/86Sr)-(87Rb/86Sr) (eλt-1)]; (143Nd/144Nd)i=[(143Nd/144Nd)-(147Sm/144Nd) (eλt-1)]; εNd(t)=[(143Nd/144Nd)i/(143Nd/144Nd)CHURi-1]×104.(147Sm/144Nd)CHUR=0.196 7; (143Nd/144Nd)CHUR=0.512 638; λ(87Rb)=1.42×10-11 a-1; λ(147Sm)=6.54×10-12 a-1. -
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