From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite
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摘要: 造山带幔源(M型)橄榄岩虽然在高压/超高压变质带分布不多,但由于其来自俯冲板块上覆的岩石圈地幔,因此是研究俯冲隧道内俯冲板片与地幔楔之间相互作用的重要对象,对于还原超高压变质带的演化有重要意义.柴北缘鱼卡榴辉岩-片麻岩区边部附近的开屏沟存在一套橄榄岩,其岩石类型、成因、时代等都缺乏研究.对开屏沟橄榄岩全岩的主量和微量元素及铂族元素、橄榄石主量元素、锆石U-Pb年龄和Hf同位素进行了研究.结果显示,其全岩具有高的Mg#、Mg/Si和Ni值,同时表现出亏损难溶的HFSE和HREE,轻微富集LILE和LREE中与流体活动性相关的元素;橄榄石具有较高的Fo值(90.11~92.77)与NiO含量(0.32%~0.45%)、低的CaO含量(< 0.02%);PGEs的球粒陨石标准化配分模式与交代橄榄岩和残留橄榄岩近似;两组变质锆石年龄为459.5±3.6 Ma和417.5±2.7 Ma,对应的εHf(t)值为-0.71~9.45和-11.96~-1.20,分别反映了洋壳流体(或早期大陆俯冲板片流体)和陆壳流体交代的性质和时限.开屏沟橄榄岩来源于俯冲带上覆地幔楔,遭受了不同来源流体不同程度的交代作用而获得地壳特征,同时为柴北缘大洋俯冲到陆陆碰撞的构造演化提供了新证据.Abstract: Orogenic peridotites(M-type) are uncommon in high-pressure(HP) and ultrahigh-pressure(UHP) metamorphic belts. However, they are not only a key to study the metamorphic and metasomatic information from subducting slabs and mantle wedges in subduction channel, but also of great significance to the evolution of orogenic belt. There is a set of peridotite in Kaipinggou near the edge of the Iqe eclogite-gneiss region, of which rock types, genesis, and age are short of research. Whole-rock major and trace and platinum-group elements, olive mineral elements, and zircon U-Pb dating and Hf isotopes for peridotite at Kaipinggou are studied in this paper. Kaipinggou peridotites are characterized by high contents of Mg#, Mg/Si and Ni, showing similar distribution patterns of REE and trace elements, depletion in HFSE and HREE, and slightly enrichment in LILE and LREE. Olivines have high Fo(90.11-92.77)and NiO(0.32%-0.45%) contents, but low contents of CaO(0.02%). Whole-rock platinum group elements(PGEs) are similar to those of metamorphic and residual peridotites. There are two groups of metamorphic zircons in the Kaipinggou peridotites, with ages of 459.5±3.6 Ma and 417.5±2.7 Ma, corresponding to εHf(t) of -0.71 to 9.45 and -11.96 to -1.20, respectively, indicating the nature and timing of the fluid derived from oceanic crust(or early continental crust subduction) and continental crust. In conclusion, the Kaipinggou peridotites are derived from the mantle wedge of the lithosphere and record the crustal features due to the metasomatism of the oceanic and continental crust fluids. The novel findings provide new evidence for the evolution of oceanic lithosphere subduction to continental collision/subduction in the North Qaidam.
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Key words:
- North Qaidam /
- Kaipinggou /
- orogenic belt /
- M-type peridotite /
- zircon U-Pb-Hf isotopes /
- geochemistry /
- geochronology
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图 1 柴北缘造山带及毗邻区域地质图(a)与开屏沟地区地质简图(b)
Fig. 1. Geological sketch of the North Qaidam orogen and adjacent areas in northern Tibet (a) and geological sketch of the Kaipinggou area (b)
图 2 柴北缘造山带开屏沟橄榄岩的野外(a, b)和显微镜下照片(c~f)
a.野外辉长岩侵入超基性岩; b.蛇纹石化橄榄岩; c.斑状蛇纹石内残留橄榄石(单偏光); d.孤岛状残留的橄榄石(正交偏光); e.蛇纹石化单斜辉石(正交偏光); f.蛇纹石内金红石包体(单偏光). Ol.橄榄岩, Cpx.单斜辉石, Srp.蛇纹石, Rut.金红石, Spl.尖晶石.据Whitney and Evans(2010)
Fig. 2. Photographs showing field occurrence (a, b) and microscope (c-f) for peridotites at Kaipinggou in the Qaidam orogen
图 3 柴北缘造山带开屏沟橄榄岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)
原始地幔及球粒陨石标准化值据McDonough and Sun(1995)
Fig. 3. Chondrite normalized REE pattern (a) and PM-normalized trace element spider diagram (b) for peridotite at Kaipinggou in the Qaidam orogen
图 4 开屏沟橄榄岩铂族元素球粒陨石标准化配分模式
底图据Su et al.(2016);标准化值据McDonough and Sun(1995)
Fig. 4. Chondrite-normalized PGE pattern for peridotite at Kaipinggou
图 7 柴北缘造山带开屏沟橄榄岩锆石中矿物包裹体的代表照片和拉曼光谱
Zrn.锆石;Ol.橄榄石;Cpx.单斜辉石;Cal.方解石.据Whitney and Evans (2010)
Fig. 7. Representative photographs and raman spectra of mineral inclusions in zircon for peridotite at Kaipinggou in the Qaidam orogen
图 9 柴北缘造山带开屏沟橄榄岩全岩Mg/Si-Mg#(a)和Ni-Mg#(b)图解
Fig. 9. Plots of Mg/Si- Mg# (a) and Ni-Mg# (b) for peridotite at Kaipinggou in the Qaidam orogen
图 10 柴北缘造山带开屏沟橄榄岩内橄榄石NiO-Fo(a)和CaO-Fo(b)图解
Fig. 10. Plots of NiO-Fo (a) and CaO-Fo (b) of peridot from peridotite at Kaipinggou in the Qaidam orogen
图 13 壳幔相互作用流体与上覆地幔交代的柴北缘造山模式
Fig. 13. Crust-mantle interaction through metasomatic reaction of the overlying mantle wedge peridotite with fluids in North Qaidam
表 1 开屏沟造山带橄榄岩主量元素(%)和微量元素(10-6)分析结果
Table 1. Major elements (%) and trace elements (10-6) results for peridotite at Kaipinggou in the Qaidam orogen
样品 P73Bb0-1 P73Bb1-1 P73Bb2-1 P73Bb3-1 P73Bb6-1 P73Bb8-1 P73Bb9-1 SiO2 37.28 39.11 36.95 37.80 38.20 38.88 38.22 TiO2 0.04 0.02 0.03 0.02 0.04 0.03 0.04 Al2O3 1.04 1.04 1.08 1.11 4.21 1.98 2.01 Fe2O3 6.52 7.22 7.19 7.97 6.13 4.78 4.78 FeO 2.95 2.45 3.20 2.75 3.80 3.20 3.20 MnO 0.13 0.11 0.11 0.10 0.15 0.10 0.11 MgO 34.83 37.04 35.40 36.30 33.96 35.07 34.30 CaO 2.81 0.20 1.79 0.88 3.46 2.27 3.10 Na2O 0.10 0.13 0.49 0.10 0.25 0.13 0.10 K2O 0.02 0.01 0.03 0.02 0.02 0.03 0.05 P2O5 0.02 0.01 0.01 0.01 0.01 0.02 0.02 LOI 13.30 11.74 12.79 12.07 9.09 12.49 13.06 H2O+ 10.06 11.20 10.31 11.07 8.90 11.31 11.02 H2O- 0.73 0.58 0.61 0.61 0.78 0.79 0.74 S 199.28 276.48 782.55 473.76 425.15 636.73 675.33 La 0.25 0.10 0.18 0.15 0.14 0.29 0.47 Ce 0.58 0.23 0.40 0.28 0.28 0.59 0.96 Pr 0.068 0.026 0.045 0.028 0.038 0.068 0.110 Nd 0.28 0.099 0.16 0.12 0.18 0.31 0.47 Sm 0.071 0.023 0.046 0.029 0.055 0.072 0.11 Eu 0.018 0.007 9 0.051 0.052 0.033 0.036 0.048 Gd 0.076 0.026 0.059 0.036 0.092 0.110 0.120 Tb 0.014 0.004 1 0.009 1 0.006 3 0.017 0.020 0.023 Dy 0.095 0.038 0.047 0.035 0.120 0.120 0.160 Ho 0.018 0.006 0.013 0.008 0.027 0.030 0.036 Er 0.055 0.026 0.043 0.033 0.079 0.10 0.10 Tm 0.010 0.006 0.007 0.005 0.013 0.020 0.019 Yb 0.069 0.047 0.056 0.037 0.085 0.140 0.130 Lu 0.012 0.008 0.011 0.009 0.016 0.021 0.021 ΣREE 1.62 0.64 1.14 0.83 1.17 1.94 2.79 LREE 1.27 0.48 0.89 0.67 0.73 1.38 2.18 HREE 0.35 0.16 0.24 0.17 0.44 0.56 0.61 LREE/HREE 3.63 2.97 3.65 3.93 1.64 2.44 3.55 (La/Yb)N 2.49 1.42 2.23 2.73 1.08 1.45 2.40 (La/Sm)N 2.24 2.70 2.50 3.26 1.55 2.54 2.61 (Gd/Yb)N 0.90 0.45 0.85 0.79 0.87 0.66 0.76 δEu 0.72 0.97 2.96 4.91 1.41 1.22 1.23 Li 1.98 1.90 0.98 1.04 1.07 1.00 1.18 Be 0.024 0.009 0.150 0.150 0.015 0.038 0.026 Sc 6.22 6.71 6.90 7.24 10.60 7.20 7.32 V 34.3 31.6 29.2 29.5 42.0 36.7 37.0 Cr 5 805 6 026 4 787 4 777 4 596 5 948 5 874 Co 124 124 116 126 109 105 103 Ni 1 961 1 938 2 147 2 108 1 642 2 110 2 070 Cu 15.60 6.40 5.97 2.56 1.28 27.70 39.40 Zn 53.0 49.6 45.4 44.3 46.4 35.4 39.6 Ga 1.74 1.91 1.33 1.30 2.40 2.20 2.28 Rb 0.79 0.15 0.36 0.27 0.18 0.92 1.47 Sr 60.7 5.5 98.8 66.4 11.8 32.2 55.2 Y 0.53 0.22 0.39 0.24 0.72 0.84 0.94 Zr 0.92 0.66 0.48 0.38 0.56 1.49 3.25 Nb 0.140 0.052 0.096 0.088 0.055 0.130 0.170 Sn 0.100 0.100 0.130 0.096 0.057 0.094 0.110 Cs 0.094 0.022 0.054 0.037 0.044 0.240 0.330 Ba 71.1 28.5 23.3 24.1 4.1 13.0 39.6 Hf 0.031 0.027 0.018 0.014 0.022 0.057 0.10 Ta 0.008 9 0.003 6 0.003 6 0.003 6 0.005 4 0.007 9 0.012 0 Tl 0.033 0.034 0.043 0.038 0.020 0.049 0.059 Pb 0.93 0.54 1.73 1.95 0.69 1.39 2.39 Th 0.096 0.025 0.050 0.029 0.021 0.090 0.150 U 0.19 0.06 0.14 0.12 0.04 0.79 0.95 表 2 开屏沟造山带橄榄岩中橄榄石主量元素含量(%)
Table 2. Contents of major elements (%) of olivine for peridotite at Kaipinggou in the Qaidam orogen
样品 Olv-1 Olv-2 Olv-3 Olv-4 Olv-5 Olv-6 Olv-7 Olv-8 Olv-9 Olv-10 Olv-11 Olv-12 Olv-13 Olv-14 Olv-15 Olv-16 Olv-17 Na2O 0.03 0.00 0.01 0.00 0.00 0.03 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.03 0.02 SiO2 38.67 38.64 38.54 37.79 38.12 38.56 37.43 38.34 38.21 38.19 38.21 38.41 38.30 38.50 39.00 39.41 38.92 TiO2 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.00 0.02 0.01 0.02 0.00 0.02 CaO 0.01 0.01 0.00 0.01 0.01 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.01 0.02 0.01 0.00 0.00 ZrO2 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 FeO 9.37 9.82 9.75 9.83 9.46 9.34 9.74 9.67 9.81 9.36 9.38 9.45 9.43 7.35 7.42 7.45 8.14 CoO 0.03 0.00 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.05 0.05 0.00 0.00 0.04 0.04 0.00 0.00 Al2O3 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.04 0.02 0.03 0.00 0.00 0.07 0.03 MgO 50.99 50.19 51.10 50.89 51.02 50.89 51.90 51.00 51.00 51.14 51.09 51.14 51.19 52.89 52.18 51.93 51.50 K2O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Cr2O3 0.00 0.03 0.01 0.00 0.00 0.00 0.01 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MnO 0.16 0.20 0.17 0.15 0.16 0.15 0.17 0.16 0.15 0.14 0.15 0.16 0.14 0.16 0.16 0.18 0.16 NiO 0.32 0.39 0.39 0.43 0.36 0.38 0.40 0.41 0.45 0.38 0.36 0.39 0.40 0.38 0.40 0.35 0.36 ZnO 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total 99.61 99.30 99.98 99.11 99.15 99.39 99.67 99.61 99.66 99.32 99.32 99.59 99.53 99.37 99.24 99.43 99.14 Si 0.96 0.96 0.95 0.94 0.95 0.96 0.93 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.96 0.97 0.96 Ti 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Al 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Cr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe2+ 0.19 0.20 0.20 0.21 0.20 0.19 0.20 0.20 0.20 0.19 0.19 0.20 0.20 0.15 0.15 0.15 0.17 Mn 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Mg 1.88 1.86 1.88 1.89 1.89 1.88 1.92 1.89 1.89 1.89 1.89 1.89 1.89 1.94 1.91 1.90 1.90 Ni 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Ca 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total 3.04 3.04 3.05 3.06 3.05 3.04 3.07 3.05 3.05 3.05 3.05 3.05 3.05 3.05 3.04 3.03 3.04 Fo 90.66 90.11 90.34 90.22 90.58 90.66 90.47 90.39 90.26 90.69 90.67 90.61 90.63 92.77 92.61 92.55 91.85 Fa 9.33 9.87 9.65 9.76 9.41 9.32 9.51 9.60 9.73 9.30 9.32 9.38 9.35 7.22 7.37 7.44 8.13 Tp 0.16 0.2 0.17 0.15 0.16 0.15 0.16 0.16 0.15 0.14 0.15 0.16 0.14 0.16 0.16 0.18 0.16 表 3 开屏沟造山带橄榄岩铂族元素含量(10-6)
Table 3. Concentrations of PGE (10-6) for peridotite at Kaipinggou in the Qaidam orogen
样品 Os Ir Ru Rh Pt Pd Pd/Ir Pt/Pt* KP01 0.66 0.82 5.61 1.65 7.04 12.6 15.4 0.26 KP02 1.75 0.60 5.55 0.76 2.33 2.17 3.6 0.31 KP03 0.96 0.89 2.03 3.91 54.4 50.6 56.9 0.66 KP04 0.57 1.59 3.70 2.40 2.08 0.94 0.6 0.24 KP05 0.38 0.40 2.83 0.92 10.0 8.36 20.9 0.62 注:${\rm{Pt/P}}{{\rm{t}}^*} = \left({{\rm{Pt}}/8.3} \right) \times \sqrt {\left({{\rm{Rh/1}}{\rm{.6}}} \right) \times \left({{\rm{Pd/4}}{\rm{.4}}} \right)} .$ 表 4 开屏沟造山带橄榄岩锆石U-Pb同位素测试结果
Table 4. Zircon LA-ICPMS U-Pb isotope data for peridotite at Kaipinggou in the Qaidam orogen
点号 元素含量 Th/U 同位素比值 年龄(Ma) Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 267.5 1 494.9 1 797.0 0.83 0.055 68 0.001 20 0.523 73 0.011 50 0.067 74 0.000 67 427.6 7.7 422.6 4.1 2 64.2 264.1 436.5 0.61 0.053 25 0.001 68 0.493 26 0.015 48 0.067 17 0.000 92 407.1 10.5 419.1 5.6 3 73.9 305.4 455.9 0.67 0.060 85 0.002 03 0.570 08 0.019 05 0.067 78 0.000 86 458.1 12.3 422.7 5.2 4 294.7 1 381.2 1 849.3 0.75 0.053 60 0.001 25 0.490 18 0.011 39 0.066 01 0.000 68 405.0 7.8 412.1 4.1 5 127.3 286.1 1 382.4 0.21 0.055 33 0.001 40 0.505 88 0.012 89 0.066 10 0.000 82 415.7 8.7 412.6 5.0 6 268.1 1 225.4 1 495.9 0.82 0.061 79 0.001 39 0.579 51 0.012 44 0.067 76 0.000 71 464.1 8.0 422.7 4.3 7 226.7 596.9 2 370.6 0.25 0.057 73 0.001 17 0.528 75 0.010 66 0.066 15 0.000 70 431.0 7.1 412.9 4.2 8 426.1 1 640.7 3 073.1 0.53 0.055 91 0.001 17 0.516 96 0.010 60 0.066 67 0.000 63 423.1 7.1 416.1 3.8 9 267.4 1 012.0 2 104.0 0.48 0.053 60 0.001 03 0.497 15 0.009 46 0.067 02 0.000 74 409.8 6.4 418.2 4.5 10 179.7 638.0 815.2 0.78 0.057 75 0.003 47 0.538 53 0.030 55 0.067 01 0.001 08 437.5 20.2 418.1 6.5 11 69.7 166.2 339.1 0.49 0.063 33 0.009 37 0.554 70 0.063 91 0.067 29 0.002 77 448.1 41.8 419.8 16.7 12 122.6 419.2 638.5 0.66 0.052 61 0.004 85 0.493 86 0.045 09 0.067 12 0.001 31 407.5 30.7 418.8 7.9 13 729.2 2 494.5 4 573.5 0.55 0.052 86 0.002 23 0.494 29 0.020 06 0.066 75 0.000 88 407.8 13.6 416.5 5.3 14 121.1 434.6 898.1 0.48 0.056 38 0.001 49 0.574 82 0.014 47 0.073 96 0.000 80 461.1 9.3 460.0 4.8 15 458.4 2 393.4 1 753.9 1.36 0.057 53 0.001 43 0.591 91 0.014 51 0.074 32 0.000 61 472.1 9.3 462.1 3.7 16 203.3 1 018.4 910.4 1.12 0.056 17 0.001 67 0.559 13 0.016 56 0.072 31 0.000 76 451.0 10.8 450.1 4.6 17 179.8 446.7 1 386.7 0.32 0.053 77 0.002 73 0.544 93 0.026 55 0.073 53 0.001 15 441.7 17.5 457.4 6.9 18 144.7 47.3 2 236.1 0.02 0.060 44 0.003 03 0.633 26 0.030 34 0.075 60 0.001 05 498.1 18.9 469.8 6.3 19 139.1 326.9 1 325.4 0.25 0.060 29 0.005 31 0.622 27 0.049 12 0.074 72 0.001 12 491.3 30.8 464.5 6.7 20 168.1 481.9 1 011.9 0.48 0.055 51 0.002 94 0.567 35 0.029 64 0.073 33 0.001 05 456.3 19.2 456.2 6.3 21 294.5 101.3 4 961.5 0.02 0.055 57 0.002 08 0.573 11 0.021 04 0.073 87 0.000 88 460.0 13.6 459.4 5.3 22 770.7 1 177.9 4 372.4 0.27 0.071 70 0.001 17 1.188 83 0.027 38 0.119 99 0.002 52 795.4 12.7 730.5 14.5 23 702.9 992.2 901.1 1.10 0.091 14 0.001 68 3.256 07 0.063 50 0.256 41 0.002 75 1470.6 15.1 1471.4 14.1 24 794.9 753.3 1 852.6 0.41 0.095 43 0.001 59 3.067 78 0.062 24 0.230 74 0.003 01 1424.7 15.5 1338.4 15.8 25 243.4 406.8 680.8 0.60 0.072 60 0.001 56 1.692 73 0.037 63 0.168 29 0.001 98 1005.8 14.2 1002.7 10.9 26 446.7 138.5 1 309.9 0.11 0.098 00 0.001 55 3.849 26 0.068 81 0.282 53 0.003 15 1603.1 14.4 1604.1 15.8 27 179.5 348.4 1 368.6 0.25 0.059 15 0.001 26 0.696 92 0.015 35 0.085 05 0.000 98 536.9 9.2 526.2 5.8 28 159.1 154.7 723.6 0.21 0.071 65 0.001 70 1.696 92 0.060 48 0.168 75 0.004 02 1007.4 22.8 1005.2 22.2 29 220.1 1 058.1 2 274.8 0.47 0.063 23 0.001 22 0.772 79 0.014 74 0.088 47 0.000 85 581.4 8.4 546.5 5.0 30 279.7 721.4 1 076.7 0.67 0.067 76 0.001 45 1.099 46 0.029 63 0.116 04 0.001 66 753.1 14.3 707.7 9.6 31 352.1 398.9 563.0 0.71 0.094 95 0.001 75 3.612 24 0.069 60 0.274 42 0.002 53 1552.2 15.3 1563.2 12.8 32 239.5 333.3 1 060.0 0.31 0.067 53 0.001 59 1.335 34 0.035 40 0.142 17 0.001 80 861.2 15.4 856.9 10.2 33 351.4 601.4 1 256.6 0.48 0.072 35 0.001 33 1.537 93 0.032 24 0.152 80 0.001 53 945.7 12.9 916.6 8.6 34 229.0 305.3 1 129.5 0.27 0.067 77 0.001 44 1.295 19 0.030 26 0.137 53 0.001 35 843.6 13.4 830.7 7.7 35 76.7 94.8 363.5 0.26 0.073 03 0.002 10 1.395 96 0.040 91 0.137 95 0.001 28 887.2 17.3 833.0 7.3 36 240.5 413.2 795.7 0.52 0.069 95 0.001 42 1.490 31 0.032 39 0.153 65 0.001 44 926.4 13.2 921.4 8.1 37 462.5 766.1 1 682.1 0.46 0.069 24 0.001 19 1.434 96 0.026 67 0.149 59 0.001 40 903.6 11.1 898.7 7.8 38 205.0 386.2 691.3 0.56 0.067 28 0.001 42 1.349 86 0.029 07 0.145 19 0.001 36 867.5 12.6 873.9 7.6 39 253.7 407.4 884.2 0.46 0.061 18 0.002 79 1.196 34 0.056 49 0.140 63 0.001 98 798.9 26.1 848.2 11.2 40 225.9 362.0 538.8 0.67 0.068 54 0.003 41 1.345 88 0.062 15 0.141 70 0.002 20 865.8 26.9 854.3 12.4 41 155.8 282.0 309.9 0.91 0.069 73 0.004 14 1.388 78 0.080 95 0.142 53 0.002 67 884.2 34.4 859.0 15.1 42 147.4 191.2 515.0 0.37 0.069 93 0.003 58 1.527 38 0.078 72 0.156 46 0.002 55 941.4 31.6 937.1 14.2 43 917.2 438.4 6253.1 0.07 0.070 75 0.002 37 1.419 64 0.048 46 0.143 57 0.002 15 897.2 20.3 864.8 12.1 表 5 开屏沟造山带橄榄岩锆石微量元素(10-6)分析结果
Table 5. Trace elements (10-6) results of zircon for peridotite at Kaipinggou in the Qaidam orogen
点号 Ti Nb La Ce Pr Nd Sm Eu Gd Tm Yb Lu Y Hf Ta 1 37.2 15.5 6.67 185 6.28 43.6 38.7 17.9 113 114 1 074 185 3 497 27 807 6.64 2 11.7 8.02 0.000 25.2 0.070 1.15 2.83 0.414 13.9 40.2 413 76.7 976 30 047 4.46 3 3.31 9.55 0.047 30.3 0.045 1.18 3.24 0.595 18.0 44.7 461 82.6 1 139 28 714 5.03 4 15.3 20.8 0.804 88.3 0.540 6.91 10.8 3.22 59.3 114 1 176 214 2 899 27 990 7.78 5 9.25 9.10 0.021 6.61 0.103 2.87 10.5 0.164 91.7 375 3 613 554 9 028 34 188 6.12 6 14.5 11.5 0.890 116 0.767 7.27 9.86 4.00 45.5 108 1 157 226 2 522 30 331 4.86 7 21.8 11.9 0.065 16.8 0.181 3.05 11.7 0.27 104 332 3 081 506 8 567 36 877 8.88 8 37.9 12.5 26.1 114 9.92 66.2 54.1 6.85 205 166 1 515 244 5 571 28 837 6.88 9 15.2 12.8 7.041 114 1.79 10.1 8.17 3.29 39.8 91.3 994 187 2 164 29 657 6.96 10 17.9 6.60 0.000 85.5 0.040 3.76 6.91 1.43 36.2 76.2 820 162 2 178 38 260 3.59 11 38.4 5.40 0.000 6.49 0.073 1.73 7.79 0.000 58.6 129 1 283 228 3 988 37 964 2.00 12 28.1 8.48 0.000 29.2 0.000 1.89 11.6 0.241 58.3 114 1 088 191 3 438 38 765 4.58 13 14.5 15.4 4.50 154 4.15 30.5 25.4 3.50 101 115 1 211 220 3 855 39 790 10.4 14 38.3 7.50 0.217 22.21 0.253 4.22 11.5 0.509 77.5 187 1 728 278 4 805 31 496 5.64 15 50.6 10.4 2.63 110 2.46 30.9 34.0 8.98 138 183 1 821 363 5 807 22 036 4.52 16 28.5 4.91 0.100 97.0 0.800 13.1 21.7 6.12 93.9 109 1 069 206 3 600 26 019 2.34 17 20.8 6.48 2.29 20.3 1.70 11.8 18.0 0.722 102 227 2 214 386 6 733 39 941 4.95 18 8.17 2.12 6.44 15.5 1.49 9.95 4.55 0.157 18.3 46.9 497 96.1 1 444 42 946 5.65 19 27.3 5.00 0.836 14.4 0.797 2.62 12.5 0.671 79.5 246 2 315 411 6 820 42 691 4.20 20 19.5 5.37 0.000 15.7 0.064 2.16 9.92 0.324 90.0 190 1 826 315 5 884 35 773 3.57 21 32.5 29.6 0.048 4.98 0.036 0.32 3.27 3.73 40.7 106 1 200 255 3 116 59 278 13.2 22 9.61 3.49 0.047 43.9 0.025 1.02 3.50 0.800 16.8 68.0 812 166 1 526 33 226 2.72 23 30.6 6.24 2.14 35.9 4.62 33.0 26.7 7.16 78.7 64.0 598 105 2 491 35 286 5.79 24 579 26.9 3.64 40.3 2.75 25.9 32.8 2.91 163 183 1 669 284 6 185 26 186 6.10 25 28.7 4.14 0.000 40.4 0.263 5.16 12.0 1.83 78.7 137 1 334 245 4 236 29 600 2.66 26 13.5 4.81 1.15 18.7 0.868 9.57 17.4 1.46 102 111 1 077 206 3 626 29 962 2.47 27 33.3 16.7 97.7 340 46.6 207 53.2 1.85 93.5 117 1 106 194 3 670 34 119 8.72 28 13.2 3.32 2.21 12.1 2.53 24.7 49.3 1.33 268 242 2 060 344 9 667 34 169 1.36 29 23.8 7.89 0.166 17.8 0.220 2.68 4.20 0.314 23.6 40.1 428 90.5 1 113 28 132 3.51 30 20.8 15.5 0.413 32.1 0.349 5.20 12.7 0.913 73.4 111 1 019 177 3 568 31 476 6.56 31 15.8 24.8 3.25 58.0 1.38 9.41 11.2 0.487 70.5 133 1 248 218 4 075 35 142 11.7 32 33.4 12.7 0.000 29.3 0.211 4.02 9.57 0.787 68.5 106 988 172 3 392 30 365 5.26 33 16.7 3.14 0.000 41.4 0.095 2.17 4.15 0.844 24.5 46.9 507 104 1 247 35 629 2.64 34 9.10 3.59 0.044 20.0 0.853 10.7 20.9 4.50 104 133 1 366 256 4 241 21 363 1.34 35 47.1 3.70 0.000 56.3 0.285 8.97 10.5 4.26 53.3 96.7 999 198 2 800 24 456 1.49 36 22.6 2.59 0.146 5.31 0.217 4.92 11.3 0.205 63.5 123 1 154 209 3 761 40 087 1.10 37 15.9 12.8 4.11 32.0 3.89 24.0 22.8 1.39 94.0 318 3 133 526 8 647 49 219 13.2 38 592 16.6 191 505 147 786 465 122 698 307 2 657 420 11 363 29 867 8.34 39 45.4 10.2 0.171 124 0.349 9.80 18.3 3.89 79.9 137 1 293 217 3 731 25 610 5.17 40 19.0 16.9 0.621 57.0 0.810 9.00 16.9 5.73 67.0 119 1 180 207 3 023 32 132 11.4 41 26.0 13.4 1.43 37.7 0.761 6.09 9.87 0.691 52.0 93.5 843 138 2 540 27 743 6.33 42 14.8 7.50 0.052 13.2 0.161 2.31 3.99 1.00 26.6 55.2 596 121 1 285 31 214 2.77 43 60.2 5.08 0.049 40.9 0.455 6.44 12.7 1.89 62.4 74.0 678 107 2 163 32 866 3.10 表 6 开屏沟造山带橄榄岩锆石Lu-Hf同位素
Table 6. Zircon Lu-Hf isotope data for peridotite at Kaipinggou in the Qaidam orogen
点号 176Yb/
177Hf2σ 176Lu/
177Hf2σ 176Hf/
177Hf2σ t
(Ma)(176Hf/
177Hf)iεHf(0) 2σ εHf (t) 2σ tDM1 tDM2 f 1 0.032 292 0.000 315 0.001 205 0.000 007 0.282 331 0.000 024 422 0.282 322 -16.06 0.84 -7.13 0.84 1 307 1 833 -0.96 2 0.022 785 0.000 139 0.000 901 0.000 005 0.282 318 0.000 028 416 0.282 311 -16.52 0.98 -7.51 0.98 1 315 1 857 -0.97 3 0.009 307 0.000 101 0.000 441 0.000 007 0.282 223 0.000 016 422 0.282 219 -19.89 0.56 -10.76 0.56 1 430 2 062 -0.99 4 0.008 041 0.000 045 0.000 346 0.000 002 0.282 188 0.000 017 419 0.282 185 -21.11 0.60 -11.96 0.61 1 474 2 137 -0.99 5 0.015 044 0.000 076 0.000 695 0.000 003 0.282 495 0.000 020 418 0.282 489 -10.27 0.72 -1.20 0.72 1 062 1 458 -0.98 6 0.019 912 0.000 146 0.000 873 0.000 006 0.282 333 0.000 020 412 0.282 326 -16.00 0.69 -6.98 0.69 1 294 1 824 -0.97 7 0.045 159 0.000 132 0.001 756 0.000 005 0.282 311 0.000 014 412 0.282 297 -16.76 0.48 -7.99 0.48 1 355 1 887 -0.95 8 0.044 966 0.000 687 0.001 764 0.000 028 0.282 247 0.000 028 412 0.282 233 -19.03 1.00 -10.26 1.01 1 447 2 030 -0.95 9 0.013 726 0.000 199 0.000 642 0.000 008 0.282 380 0.000 018 422 0.282 375 -14.33 0.64 -5.24 0.64 1 220 1 714 -0.98 10 0.033 319 0.000 156 0.001 265 0.000 006 0.282 344 0.000 022 418 0.282 334 -15.59 0.79 -6.64 0.79 1 291 1 804 -0.96 11 0.023 167 0.000 135 0.000 991 0.000 005 0.282 238 0.000 021 419 0.282 230 -19.36 0.75 -10.31 0.75 1 430 2 036 -0.97 12 0.003 463 0.000 171 0.000 198 0.000 007 0.282 243 0.000 014 418 0.282 241 -19.18 0.51 -9.94 0.51 1 394 2 012 -0.99 13 0.008 054 0.000 033 0.000 442 0.000 002 0.282 261 0.000 017 416 0.282 258 -18.53 0.58 -9.40 0.58 1 378 1 976 -0.99 14 0.008 488 0.000 078 0.000 388 0.000 004 0.282 725 0.000 022 457 0.282 721 -2.14 0.77 7.93 0.77 735 909 -0.99 15 0.061 912 0.000 202 0.002 827 0.000 011 0.282 715 0.000 022 464 0.282 690 -2.49 0.78 6.98 0.78 800 975 -0.92 16 0.022 528 0.000 252 0.000 902 0.000 006 0.282 485 0.000 015 456 0.282 478 -10.59 0.53 -0.71 0.53 1 081 1 458 -0.97 17 0.016 885 0.000 263 0.000 813 0.000 011 0.282 558 0.000 026 462 0.282 551 -8.02 0.92 2.02 0.92 977 1 289 -0.98 18 0.021 069 0.000 185 0.001 228 0.000 008 0.282 773 0.000 036 459 0.282 763 -0.41 1.27 9.45 1.27 683 814 -0.96 19 0.008 278 0.000 177 0.000 386 0.000 008 0.282 706 0.000 023 459 0.282 703 -2.80 0.82 7.32 0.82 761 950 -0.99 20 0.041 891 0.000 649 0.002 571 0.000 044 0.282 768 0.000 045 458 0.282 745 -0.62 1.61 8.81 1.61 716 854 -0.92 21 0.005 837 0.000 034 0.000 283 0.000 002 0.282 589 0.000 010 462 0.282 587 -6.92 0.37 3.29 0.37 920 1 209 -0.99 -
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