In-Situ Trace Elements and Sr Isotopes in Peridotite Xenoliths from Jining: Implications for Lithospheric Mantle Evolution
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摘要: 为完整了解华北克拉通的破坏程度和机制，加深对其西部陆块岩石圈地幔的研究十分重要，而位于华北克拉通西部集宁新生代碱性玄武岩中的地幔橄榄岩包体，为研究人员认识该地区的岩石圈地幔的性质和演化起到指示作用.运用LA-ICP-MS和LA-MC-ICP-MS对集宁地区橄榄岩矿物进行原位微区测试，获得其主量、微量元素和Sr同位素成分的数据.根据矿物组成，可以将集宁地区的橄榄岩分为两类：第一类为贫单斜辉石橄榄岩 (单斜辉石体积分数小于8%)，它们经历了高程度的部分熔融，可能是古老难熔岩石圈地幔的残留；第二类为二辉橄榄岩 (单斜辉石体积分数大于13%)，其熔融程度低，代表了新生饱满的岩石圈地幔.第一类橄榄岩中单斜辉石REE含量整体偏低且轻微富集LREE，第二类橄榄岩中单斜辉石具有LREE富集和轻微亏损两种配分模式，大部分样品的核边有一定的强不相容元素及Sr同位素组成变化.这些微量元素和同位素特征都表明集宁橄榄岩包体经历过交代作用.(La/Yb)N和Ti/Eu比值特征表明它们经历过多阶段的交代作用，交代介质有硅酸盐、碳酸盐熔/流体，这些交代介质可能为来源于古亚洲洋板块俯冲时释放的熔/流体.Abstract: Further research on the lithospheric mantle beneath western North China craton is significant in order to understand the degree and evolution of its thinning and transformation thoroughly. Mantle peridotite xenoliths in the Cenozoic alkaline basalts from Jining of western North China craton provide important constraints on the nature and evolution of the lithospheric mantle beneath this area. The samples were analyzed by using LA-ICP-MS and LA-MC-ICP-MS to obtain major element, trace element and Sr isotopic compositions. According to the mineral composition, the peridotites were classified into two groups: (1) Clinopyroxene (Cpx)-poor peridotites (Cpx < 8%), which might have experienced high-degree partial melting, suggest relict of old and refractory lithospheric mantle under this area. (2) lherzolites (Cpx > 13%). They might have experienced low-degree partial melting, representing the fertilized lithospheric mantle. Cpx grains in Type 1 peridotite have relatively low REE contents and show slightly LREE-enriched patterns, while Cpx grains in Type 2 peridotite show both LREE-enriched and slightly LREE-depleted REE patterns. Most Cpx grains show core-rim variations in strong incompatible elements and Sr isotopic compositions. These features indicate that the peridotites could have experienced metamorphism. Variations of (La/Yb)N and Ti/Eu ratios imply multistage metasomatism, which could have been caused by silicate and carbonatite melts/fluids associated with the Paleo-Asian oceanic plate subduction.
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Key words:
- western North China craton /
- Jining /
- perdotite xenoliths /
- in situ /
- Sr isotope /
- Paleo-Asian oceanic plate /
- geochemistry
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图 1 华北克拉通主要构造单元和采样点位置
EB.东部陆块；WB.西部陆块；COB.中部造山带；据Zhao et al.(2001)
Fig. 1. Major tectonic units in the North China craton and sampling locations
图 2 镜下矿物照片
a.橄榄岩样品MLGT18的Cpx反射光矿物照片，边部具明显海绵边；b.橄榄岩样品MLGT13的Cpx反射光矿物照片，无明显海绵边；c.橄榄岩样品MLGT02的Sp反射光矿物照片，边部具明显反应边；d.橄榄岩样品MLGT07-1的透射光矿物照片，图中Ol、Opx、Cpx和Sp分别表示橄榄石、斜方辉石、单斜辉石和尖晶石
Fig. 2. Pictures under microscope
图 3 单矿物中主量元素含量与Mg#关系
a.橄榄石MnO含量-Mg#图解；b.斜方辉石Al2O3含量-Mg#图解；c.单斜辉石Al2O3含量-Mg#图解；d.单斜辉石CaO含量-Mg#图解；山旺地区数据来自Zheng et al.(1998)，鹤壁地区数据来自Zheng et al.(2001)，集宁三义堂地区前人数据来自周媛婷等 (2010)和王亚妹等 (2011)
Fig. 3. Relationship between major elemeuts and Mg# in monominerals
图 4 单斜辉石稀土元素配分模式图和微量元素分布模式
a, b.第一类橄榄岩；c, d, e, f.第二类橄榄岩；球粒陨石值据Taylor and Mclennan (1985)，原始地幔值据Mcdonough and Sun (1995)；图例中c、r和sr分别表示核部、边部和海绵边
Fig. 4. CI-normalized REE patterns and PM-normalized trace element patterns of clinopyroxenes
图 5 单矿物中Cr#与Mg#关系
a.单斜辉石Cr#-Mg#图解；b.尖晶石Cr#-Mg#图解；山旺地区数据来自Zheng et al.(1998)，鹤壁地区数据来自Zheng et al.(2001)，集宁三义堂地区前人数据来自周媛婷等 (2010)和王亚妹等 (2011)
Fig. 5. Relationship between Cr# and Mg# in monominerals
图 6 单斜辉石核-边87Sr/86Sr比值及La元素含量变化
a和b中87Sr/86Sr比值的平均值分别为0.704 2和0.703 7
Fig. 6. Core-rim variations of 87Sr/86Sr ratios and La content across the clinopyroxene grains
图 7 单斜辉石原始地幔归一化的部分熔融模拟
原始地幔值据Mcdonough and Sun (1995)
Fig. 7. Modeling of partial melting using primitive mantle normalized compositions of clinopyroxenes
图 9 集宁橄榄岩包体矿物组成三角图解
尖晶石二辉橄榄岩标准矿物组成据Kelemen et al.(1992)
Fig. 9. Triangular plot of modal composition of the Jining peridotite xenoliths
图 10 单斜辉石的 (La/Yb)N-Ti/Eu值
数据来自周媛婷等 (2010)和王亚妹等 (2011)；图例中c、r和sr分别表示核部、边部和海绵边
Fig. 10. Plots of (La/Yb)N versus Ti/Eu in clinopyroxenes
表 1 集宁橄榄岩包体岩性、矿物组成及平衡温度
Table 1. Lithology, modal mineralogy and equilibrium temperatures of the Jining peridotite xenoliths
样品号 岩性 体积分数 (%) 单斜辉石海绵边 伊丁石化程度 温度 (℃)(Brey and Köhler, 1990) 橄榄石 斜方辉石 单斜辉石 尖晶石 第一类橄榄岩 MLGT07-1 尖晶石二辉橄榄岩 62 29 8 1 无 无 836 MLGT13 方辉橄榄岩 65 32 / 3 无 轻微 1 013 第二类橄榄岩 MLGT01 尖晶石二辉橄榄岩 68 14 16 2 有 无 992 MLGT02 尖晶石二辉橄榄岩 57 18 24 1 部分有 无 1 026 MLGT11 尖晶石二辉橄榄岩 43 32 23 2 部分有 轻微 989 MLGT17 尖晶石二辉橄榄岩 41 43 15 1 部分有 无 947 MLGT18 尖晶石二辉橄榄岩 40 31 24 5 有 无 951 MLGT21 尖晶石二辉橄榄岩 70 12 13 5 部分有 无 886 
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附表 2 橄榄石主量元素 (%) 和微量元素 (×10-6) 组成
附表 2. Major oxides (%) and trace element (×10-6) compositions of olivines from the Jining peridotite xenoliths
样品 MLGT07-1 MLGT01 MLGT02 OL-1 OL-2 MLGT11 边 核 边 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 边 核 边 边 核 边 MgO 50.96 51.54 50.56 49.43 49.07 49.00 48.59 49.97 51.90 51.78 51.67 51.69 51.40 51.60 51.81 51.37 51.09 51.42 51.41 SiO2 39.16 38.66 39.31 40.08 40.37 40.40 40.88 39.40 38.76 38.81 38.90 38.89 39.12 38.78 38.72 39.07 39.33 39.03 38.94 Al2O3 0.04 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.01 0.01 0.01 0.01 0.01 0.00 0.01 0.01 0.04 0.04 0.04 P2O5 0.05 0.04 0.05 0.05 0.05 0.04 0.05 0.07 0.04 0.03 0.04 0.04 0.04 0.04 0.03 0.03 0.04 0.04 0.04 Na2O 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 K2O 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 0.00 0.00 CaO 0.10 0.11 0.11 0.10 0.11 0.10 0.10 0.10 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.10 0.10 0.10 TiO2 0.00 0.01 0.01 0.01 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 MnO 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.12 0.12 0.12 0.13 0.13 0.13 FeO 9.13 9.06 9.35 9.69 9.75 9.80 9.74 9.83 8.72 8.80 8.82 8.81 8.86 9.00 8.87 8.94 8.83 8.80 8.90 Total 99.59 99.60 99.57 99.55 99.54 99.54 99.55 99.57 99.59 99.59 99.59 99.59 99.59 99.58 99.59 99.58 99.58 99.58 99.58 Mg# 90.90 91.00 90.60 90.10 90.00 89.90 89.90 90.10 91.40 91.30 91.30 91.30 91.20 91.10 91.20 91.10 91.20 91.20 91.20 Li 1.53 1.62 1.11 1.74 2.16 2.05 1.27 3.50 1.39 1.64 1.77 1.74 2.32 3.98 1.75 3.62 1.27 1.60 1.46 Sc 3.58 3.40 3.20 3.48 3.46 3.43 3.31 3.14 2.00 1.82 1.92 2.08 2.05 1.88 1.62 2.02 3.32 3.12 3.08 V 4.91 4.92 4.91 5.17 5.24 5.14 5.23 6.46 1.60 1.52 1.16 1.40 2.60 1.61 1.45 2.59 6.81 4.88 5.19 Cr 186 193 186 193 199 198 194 198 38.8 37.3 38.8 38.5 43.2 48.2 33.6 42.5 168 165 165 Co 135 129 137 142 144 146 139 138 131 133 133 133 133 132 131 133 140 138 138 Ni 2 762 2 687 2 903 3 064 3 119 3 165 3 092 2 915 2 967 2 967 2 990 2 976 2 987 3 040 2 947 3 065 2 882 2 848 2 840 Cu 2.27 1.52 1.29 1.71 1.56 0.98 0.00 0.69 1.82 0.40 1.08 0.78 0.97 0.09 0.50 0.47 0.36 1.58 1.12 Zn 54.80 52.80 51.50 60.40 58.10 61.20 63.40 61.30 49.90 40.40 49.50 49.50 50.00 53.80 52.10 46.30 61.00 62.70 65.60 MgO 52.38 50.84 51.24 51.05 51.63 50.92 51.28 50.78 50.56 50.50 50.64 50.75 50.75 50.99 51.05 51.25 SiO2 38.96 41.15 40.38 40.88 39.77 38.96 38.73 39.06 39.68 39.72 39.68 39.16 39.18 39.05 39.01 38.80 Al2O3 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.04 0.04 0.03 0.01 0.01 0.01 0.01 P2O5 0.04 0.04 0.04 0.03 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Na2O 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 K2O 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 CaO 0.11 0.10 0.12 0.10 0.11 0.08 0.07 0.08 0.09 0.09 0.09 0.04 0.04 0.04 0.04 0.03 TiO2 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.00 0.01 0.01 0.00 0.00 0.00 0.00 MnO 0.12 0.11 0.11 0.11 0.12 0.13 0.13 0.13 0.13 0.13 0.13 0.14 0.14 0.14 0.14 0.14 FeO 7.93 7.31 7.64 7.37 7.86 9.40 9.29 9.44 9.03 9.05 8.96 9.42 9.41 9.31 9.31 9.32 Total 99.57 99.60 99.58 99.60 99.56 99.58 99.59 99.58 99.59 99.59 99.60 99.59 99.57 99.58 99.59 99.59 Mg# 92.20 92.50 92.30 92.50 92.10 90.60 90.80 90.60 90.90 90.90 91.00 90.60 90.60 90.70 90.70 90.80 Li 1.91 1.88 1.45 2.28 2.00 1.46 1.63 1.65 2.59 1.82 1.90 2.83 1.64 1.46 1.76 1.48 Sc 3.97 3.05 2.71 3.27 3.23 3.12 3.31 2.76 2.92 3.28 3.31 2.46 1.58 1.68 1.90 1.75 V 4.71 3.97 4.44 4.38 4.39 3.99 4.24 3.84 4.94 4.55 4.93 6.88 2.16 2.01 1.83 2.04 Cr 319 313 321 308 323 113 117 115 142 145 142 86.4 24.9 29.8 24.4 25.0 Co 126 119 124 119 130 136 133 136 138 137 137 139 142 137 135 134 Ni 2 768 2 624 2 687 2 602 2 837 2 941 2 877 2 921 2 796 2 800 2 748 2 923 3 129 3 053 2 953 2 97 Cu 0.90 1.13 1.11 1.03 0.88 1.63 1.64 0.98 0.59 1.27 0.93 2.38 1.07 1.13 1.03 0.60 Zn 60.00 50.50 56.50 54.80 57.40 55.30 52.70 50.80 62.40 65.90 67.30 48.50 47.40 46.20 47.10 47.50
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附表 3 斜方辉石主量元素 (%) 和微量元素 (×10-6) 组成
附表 3. Major oxides (%) and trace element (×10-6) compositions of orthopyroxenes from the Jining peridotite xenoliths
样品 MLGT01 MLGT02 MLGT07-1 MLGT11 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 边 核 边 MgO 33.42 33.38 33.53 33.61 33.27 33.42 33.63 33.57 33.64 33.38 34.99 35.05 35.17 35.24 34.98 33.83 34.41 33.81 Al2O3 5.25 5.06 4.88 4.79 4.99 5.17 5.00 4.96 5.09 5.11 2.46 2.49 2.54 2.55 2.45 5.05 5.02 5.13 SiO2 53.10 53.58 53.56 53.69 53.60 53.25 53.25 53.32 53.15 53.31 55.52 55.44 55.35 55.20 55.47 53.26 52.83 53.14 P2O5 0.05 0.04 0.04 0.04 0.04 0.05 0.05 0.05 0.04 0.05 0.04 0.04 0.03 0.04 0.04 0.04 0.04 0.04 K2O 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 0.00 Na2O 0.15 0.14 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.15 0.03 0.03 0.03 0.03 0.03 0.16 0.16 0.16 CaO 1.14 1.07 1.01 1.03 1.11 1.15 1.15 1.16 1.16 1.16 0.45 0.45 0.48 0.46 0.46 1.05 1.00 1.09 TiO2 0.12 0.12 0.11 0.11 0.12 0.12 0.12 0.12 0.12 0.12 0.03 0.03 0.03 0.03 0.03 0.12 0.12 0.12 MnO 0.12 0.12 0.12 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 FeO 5.88 5.77 5.87 5.77 5.86 5.79 5.78 5.80 5.76 5.81 5.85 5.83 5.74 5.81 5.92 5.68 5.64 5.68 Total 99.23 99.28 99.27 99.30 99.26 99.24 99.26 99.25 99.24 99.23 99.50 99.50 99.50 99.49 99.51 99.33 99.35 99.31 Mg# 91.00 91.20 91.10 91.20 91.00 91.10 91.20 91.20 91.20 91.10 91.40 91.50 91.60 91.50 91.30 91.40 91.60 91.40 Li 4.33 2.47 1.50 2.20 4.28 10.80 17.00 19.60 19.40 14.90 1.90 1.60 2.25 1.93 2.16 15.20 2.51 9.37 Sc 19.50 19.80 18.90 19.00 19.10 19.30 18.80 18.70 19.60 19.30 17.80 18.30 19.50 19.00 18.40 19.20 18.30 18.40 V 98.40 94.70 95.00 92.90 96.70 99.50 98.80 97.30 99.30 99.10 75.80 77.30 76.60 78.00 74.70 92.60 91.40 94.90 Cr 4 305 4 052 4 050 3 876 4 135 4 254 4 092 4 122 4 200 4 282 2 596 2 625 2 608 2 661 2 583 3 620 3 490 3 727 Co 57.00 54.50 57.60 57.50 55.90 58.40 58.50 59.90 58.60 60.00 51.50 50.90 49.90 52.30 52.00 58.00 59.00 59.00 Ni 788 770 801 790 787 825 832 836 832 838 675 670 662 678 684 820 814 829 Zn 32.30 34.60 32.80 33.60 34.50 33.50 35.80 33.60 37.80 32.90 34.60 30.80 32.80 36.00 33.30 35.90 38.80 42.20 Rb 0.17 0 0.10 0. 0.12 0 0.06 0 0.24 0.07 0 0 0.10 0.13 0.03 0 0 0 Sr 1.09 0.96 0.79 0.64 0.95 1.10 1.19 1.12 1.23 1.02 0.13 0.12 0.24 0.11 0 0.33 0.27 0.68 Y 1.50 1.04 1.34 1.16 1.23 1.46 1.32 1.08 1.29 1.36 0.26 0.33 0.32 0.37 0.15 1.56 1.30 1.48 Zr 1.12 1.63 1.60 1.89 2.41 1.96 2.27 1.96 1.20 2.01 0.61 0.42 1.24 0.11 1.80 0 1.63 2.15 Nb 0.36 0.19 0.29 0.32 0.27 0.16 0.34 0.24 0.14 0.13 0.03 0 0.17 0.08 0.01 0.21 0 0.14 样品 MLGT01 MLGT02 MLGT07-1 MLGT11 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 边 过渡带 核 过渡带 边 MgO 34.18 34.20 34.41 34.30 34.70 33.94 33.92 33.96 34.01 34.00 32.50 32.83 32.82 32.76 32.69 34.85 33.99 34.38 34.54 34.41 Al2O3 2.89 2.88 2.87 3.11 2.72 4.89 4.87 4.86 4.91 4.96 5.03 4.91 5.07 5.12 5.15 4.31 4.72 4.73 4.55 4.12 SiO2 55.14 55.23 55.07 54.55 55.08 53.44 53.56 53.51 53.36 53.28 54.79 54.71 54.53 54.49 54.42 53.35 53.24 53.11 53.30 54.03 P2O5 0.04 0.04 0.04 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 K2O 0.00 0.00 0.00 0.04 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 Na2O 0.08 0.08 0.08 0.18 0.08 0.13 0.13 0.13 0.13 0.13 0.14 0.14 0.14 0.14 0.15 0.07 0.10 0.08 0.07 0.06 CaO 1.24 1.19 1.11 1.13 1.01 0.87 0.84 0.83 0.82 0.83 1.01 0.88 0.84 0.88 0.97 0.53 0.90 0.62 0.50 0.49 TiO2 0.10 0.09 0.09 0.19 0.09 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.11 0.13 0.12 0.11 0.11 MnO 0.12 0.12 0.12 0.12 0.12 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.14 0.14 0.14 0.14 0.14 FeO 5.20 5.18 5.22 5.39 5.25 5.79 5.77 5.79 5.84 5.87 5.64 5.66 5.71 5.72 5.71 6.19 6.29 6.32 6.30 6.20 Total 98.99 99.01 99.02 99.06 99.09 99.38 99.39 99.38 99.37 99.38 99.42 99.44 99.41 99.40 99.40 99.60 99.54 99.55 99.56 99.60 Mg# 92.1 92.2 92.2 91.9 92.2 91.3 91.3 91.3 91.2 91.2 91.1 91.2 91.1 91.1 91.1 90.9 90.6 90.7 90.7 90.8 Li 12.5 17.0 15.2 7.7 0.88 12.2 7.94 15.2 12.2 17.9 13.3 3.27 0.88 5.08 11.1 22.5 13.3 7.40 17.0 16.9 Sc 17.8 17.8 17.6 17.6 16.8 18.6 18.8 18.1 18.6 19.3 18.3 18.3 17.9 18.3 19.6 15.4 17.6 17.4 16.0 15.6 V 73.8 73.5 74.0 76.6 70.2 95.6 95.1 93.7 95.2 95.3 94.8 92.0 93.3 94.9 96.0 91.7 102 101 96.3 88.0 Cr 5980 5852 5740 5459 5344 3332 3283 3280 3328 3314 2992 2952 3071 3161 3188 1890 2248 2197 2120 1826 Co 57.1 55.8 55.9 56.5 54.5 57.3 57.5 57.9 56.3 56.0 59.1 58.8 58.6 58.1 58.1 53.8 54.2 55.7 54.5 55.5 Ni 827 810 823 829 821 769 772 783 784 778 787 771 788 779 789 706 719 725 720 726 Zn 39.1 38.7 36.6 40.5 33.9 33.6 35.7 32.8 37.3 33.6 41.8 38.2 40.4 37.9 37.1 28.2 27.4 28.1 28.1 29.9 Rb 0.070 0.10 0 0.31 0 0 0 0 0 0.020 0 0 0 0 0.040 0 0.23 0 0.15 0.23 Sr 2.36 1.81 1.80 10.1 1.01 0.16 0 0.11 0.33 0.18 0.28 0.28 0.29 0.040 0.50 0.070 1.09 0.33 0.16 0.060 Y 0.45 0.51 0.36 0.97 0.35 1.29 1.27 1.12 1.23 1.25 1.42 1.33 1.26 1.44 1.57 0.88 1.35 1.18 0.82 0.88 Zr 2.41 1.06 1.97 7.06 1.35 2.60 3.10 1.99 2.46 3.00 1.58 0.99 2.08 2.43 1.96 0.52 1.85 0.95 1.54 0.32 Nb 0.16 0.14 0.22 0.92 0.12 0.040 0 0 0 0.010 0 0 0 0.020 0 0 0.11 0.10 0.010 0
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附表 4 单斜辉石主量元素 (%) 和微量元素 (×10-6) 组成
附表 4. Major oxides (%) and trace element (×10-6) compositions of clinopyroxenes from the Jining peridotite xenoliths
样品 MLGT01 MLGT02 MLGT07-1 MLGT11 边 核 边 海绵边 海绵边 边 核 边 海绵边 边 核 边 海绵边 边 核 边 海绵边 MgO 17.40 17.40 17.40 17.70 16.00 17.40 17.50 17.40 17.50 17.70 17.50 17.60 17.80 17.10 17.20 17.30 17.30 Al2O3 6.09 5.95 6.22 5.39 5.68 6.38 6.21 6.47 6.22 3.24 3.35 3.14 3.08 6.76 6.73 6.87 6.15 SiO2 51.40 51.80 51.30 51.00 51.80 51.10 51.10 51.10 51.90 51.90 51.80 52.00 52.90 50.50 50.60 50.70 50.40 P2O5 0.04 0.04 0.05 0.06 0.17 0.05 0.05 0.05 0.24 0.03 0.03 0.03 0.04 0.04 0.04 0.04 0.04 K2O 0.01 0.01 0.01 0.27 1.07 0.01 0.01 0.01 1.24 0.00 0.00 0.00 0.20 0.01 0.01 0.01 0.17 Na2O 1.35 1.35 1.37 0.57 1.20 1.44 1.43 1.44 1.10 0.90 0.90 0.85 0.95 1.55 1.56 1.60 0.60 CaO 18.70 18.50 18.60 19.80 18.30 18.50 18.60 18.40 16.00 22.50 22.50 22.70 21.20 19.20 18.90 18.60 20.70 TiO2 0.34 0.33 0.35 0.72 1.45 0.35 0.34 0.35 1.05 0.10 0.11 0.10 0.16 0.42 0.41 0.39 0.47 MnO 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.09 0.07 0.07 0.07 0.08 0.10 0.10 0.10 0.09 FeO 3.40 3.42 3.46 3.12 3.03 3.52 3.53 3.49 3.44 2.54 2.53 2.49 2.56 3.29 3.27 3.33 2.93 Total 98.87 98.86 98.83 98.73 98.73 98.83 98.86 98.82 98.81 98.92 98.85 99.05 98.99 98.91 98.90 98.89 98.85 Mg# 90.1 90.1 90.0 91.0 90.4 89.8 89.8 89.9 90.1 92.6 92.5 92.7 92.5 90.3 90.4 90.2 91.3 Sc 56.2 56.2 53.6 59.2 64.9 51.1 53.5 50.6 53.0 94.5 96.3 98.4 93.0 61.8 59.8 55.3 57.5 V 214 218 215 248 296 219 219 218 247 235 240 234 232 234 233 224 242 Cr 6 803 6 859 6 892 7 695 7 475 6 813 6 821 7 063 6 669 6 578 7 067 5 697 6 000 6 592 6 656 6 631 6 965 Co 25.6 25.2 25.8 22.8 21.1 26.4 26.5 26.8 28.9 18.7 18.4 17.2 19.3 25.0 25.4 26.1 22.0 Ni 411 410 559 434 463 635 433 427 681 325 326 324 331 408 412 412 315 Cu 1.45 1.85 5.02 5.06 6.96 4.32 2.38 3.82 40.80 2.64 2.71 1.19 2.38 0.79 1.72 2.94 17.90 Zn 12.8 11.9 15.5 12.4 14.0 10.8 10.8 12.5 16.8 8.1 9.1 8.2 11.0 12.7 17.6 12.7 24.8 Rb 0.002 0 0.11 4.09 8.41 0.062 0 0.13 12.6 0.002 0 0.057 1.73 0.16 0.14 0 2.23 Sr 176 175 175 85.4 119 177 181 178 146 80.0 82.0 83.3 114 86.2 88.6 96.0 92.2 Cr# 9.70 10.0 9.60 12.1 11.2 9.30 9.60 9.50 9.40 16.4 16.9 14.9 15.8 8.60 8.70 8.50 9.80 Y 13.7 13.3 13.5 17.2 20.4 13.8 13.8 14.1 18.9 5.34 5.85 5.49 6.57 16.8 17.0 16.7 19.5 Zr 20.3 20.0 20.3 39.2 93.2 18.8 19.9 23.1 91.7 9.62 8.92 8.75 25.7 27.4 26.0 25.9 31.8 Nb 3.10 3.42 3.43 3.42 13.5 3.34 3.32 3.41 16.0 1.20 0.94 0.92 3.82 1.05 1.13 1.25 2.14 Cs 0.049 0 0 0 0.044 0.062 0.045 0 0.060 0.003 0 0.033 0 0 0 0.067 0.18 Ba 0.26 0.074 0.76 3.76 18.60 0 0.17 0 68.8 0.76 0 0.31 1.74 0 0.90 0.41 13.0 La 6.04 6.03 6.19 4.72 8.89 6.60 6.55 6.68 15.7 2.31 2.27 2.10 4.12 1.46 1.63 1.79 2.84 Ce 17.2 16.8 17.4 16.7 25.9 18.5 18.7 19.1 36.5 4.98 4.97 4.94 11.0 4.18 4.43 5.20 7.66 Pr 2.15 1.95 2.21 2.35 4.15 2.27 2.28 2.44 4.64 0.77 0.91 0.77 1.67 0.69 0.63 0.87 1.09 Nd 7.16 7.82 8.02 12.1 20.7 8.21 9.11 9.95 18.6 4.29 4.57 3.84 7.72 3.59 4.47 4.25 5.27 Sm 1.81 0.96 1.32 2.61 5.29 2.60 1.76 1.89 3.78 1.00 0.88 0.91 2.25 1.61 1.53 1.46 1.52 Eu 0.67 0.61 0.63 0.86 1.47 0.59 0.72 0.69 1.32 0.44 0.32 0.44 0.70 0.64 0.51 0.70 0.92 Gd 2.31 2.11 1.97 3.24 5.01 2.57 2.00 1.65 4.45 0.91 1.09 1.22 1.70 2.48 1.74 2.37 2.79 Tb 0.31 0.35 0.40 0.51 0.75 0.40 0.45 0.38 0.70 0.10 0.16 0.15 0.21 0.39 0.44 0.46 0.46 Dy 2.29 2.43 2.30 2.96 4.28 2.71 2.63 2.89 4.25 1.12 1.07 1.11 1.38 2.89 2.86 3.10 3.41 Ho 0.50 0.41 0.55 0.57 0.86 0.56 0.58 0.55 0.86 0.24 0.24 0.20 0.23 0.66 0.72 0.71 0.74 Er 1.25 1.17 1.65 1.75 2.10 1.73 1.83 1.69 2.46 0.59 0.68 0.74 0.73 1.69 2.01 1.72 2.14 Tm 0.20 0.15 0.19 0.26 0.34 0.15 0.24 0.26 0.32 0.074 0.074 0.060 0.076 0.22 0.25 0.23 0.29 Yb 1.46 1.06 0.87 1.73 1.78 1.61 1.44 1.75 1.20 0.41 0.91 0.57 0.60 2.11 1.72 2.00 2.05 Lu 0.12 0.18 0.17 0.18 0.19 0.18 0.24 0.21 0.31 0.08 0.15 0.087 0.10 0.21 0.22 0.27 0.21 Hf 0.54 0.62 0.57 1.45 2.58 0.79 0.48 0.76 2.17 0.18 0.32 0.18 0.47 0.81 0.73 0.83 0.87 Ta 0.45 0.40 0.37 0.34 1.20 0.54 0.48 0.61 1.43 0.027 0.028 0.025 0.27 0.034 0.065 0.016 0.16 Pb 0.042 0 0 0.077 0.28 0.010 0.051 0 0.25 0.57 0.55 0.64 0.50 0.058 0.18 0.13 0.050 Th 0.38 0.28 0.37 0.23 1.28 0.54 0.40 0.49 1.86 0.23 0.22 0.24 0.26 0.13 0.23 0.087 0.16 U 0.073 0.14 0.14 0.091 0.36 0.073 0.11 0.13 0.56 0.061 0.064 0.074 0.12 0 0.033 0.042 0.037 (La/Yb)N 2.81 3.86 4.83 1.85 3.39 2.78 3.09 2.59 8.89 3.83 1.69 2.50 4.66 0.47 0.64 0.61 0.94 样品 MLGT17 MLGT18 MLGT21 海绵边 边 核 边 海绵边 海绵边 边 核 边 海绵边 边 核 核 边 海绵边 MgO 19.00 16.80 16.80 16.80 18.70 17.60 16.70 16.70 16.70 17.80 16.01 15.90 15.81 16.00 18.62 Al2O3 4.90 6.80 6.80 6.80 5.00 4.99 6.80 6.86 6.85 5.21 6.30 6.62 6.85 6.46 4.08 SiO2 50.50 50.50 50.50 50.70 50.40 51.40 51.30 51.10 51.50 51.40 50.67 50.35 50.07 50.39 51.47 P2O5 0.00 0.00 0.00 0.00 0.00 0.04 0.04 0.04 0.04 0.03 0.04 0.04 0.04 0.03 0.04 K2O 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.04 Na2O 0.50 1.60 1.60 1.60 0.50 0.55 1.53 1.50 1.52 0.56 1.56 1.59 1.64 1.58 0.54 CaO 20.20 19.70 19.80 19.50 20.70 21.00 19.20 19.30 18.90 20.60 21.21 21.24 21.29 21.22 20.03 TiO2 0.60 0.50 0.50 0.50 0.50 0.49 0.46 0.47 0.45 0.48 0.55 0.56 0.56 0.56 0.64 MnO 0.10 0.10 0.10 0.10 0.10 0.09 0.10 0.09 0.10 0.10 0.08 0.08 0.08 0.08 0.08 FeO 3.00 2.90 2.80 2.90 3.00 2.74 2.96 2.91 2.98 2.80 2.85 2.85 2.86 2.90 3.52 Total 98.90 98.90 98.90 98.90 98.90 98.92 99.02 99.03 99.03 98.93 99.27 99.24 99.20 99.22 99.06 Mg# 91.8 91.1 91.4 91.1 91.6 92.0 90.9 91.1 90.9 91.9 91.0 91.9 90.9 90.9 90.5 Sc 67.4 65.0 65.5 63.3 67.1 63.4 59.0 61.7 60.6 63.3 75.7 73.7 68.4 74.4 95.6 V 254 240 241 240 253 256 230 232 230 255 268 265 262 268 333 Cr 6637 6311 6538 6527 6924 6493 5783 5781 5730 6477 4136 4339 4650 4455 5124 Co 24.6 23.1 22.6 22.7 3.0 23.1 24.8 24.0 24.8 23.7 18.6 18.4 17.8 18.6 20.5 Ni 424 378 379 379 24 359 388 389 388 360 325 326 321 328 351 Cu 8.70 3.00 2.80 3.40 400.00 5.21 1.84 2.15 2.41 3.27 3.36 1.77 1.04 3.05 143.61 Zn 11.2 9.7 10.9 12.9 3.2 16.3 11.8 12.8 11.8 15.5 7.2 7.1 4.9 5.9 25.4 Rb 1.20 0.10 0 0.10 1.40 0.29 0.10 0 0 0.15 0.033 0.008 0 0 1.09 Sr 73.5 75.3 72.7 80.1 56.3 43.2 66.4 67.5 66.7 43.8 44.5 45.0 47.4 45.0 253 Cr# 11.6 8.30 8.50 8.50 11.8 11.1 7.60 7.50 7.40 10.7 6.00 6.00 6.20 6.30 11.0 Y 18.4 17.9 17.8 17.2 18.3 20.4 18.3 18.8 18.1 20.5 21.0 21.9 22.4 21.6 24.8 Zr 36.9 30.9 29.0 27.9 26.9 27.4 26.7 27.1 27.1 24.6 21.4 23.7 19.4 20.5 24.1 Nb 0.60 0.30 0.30 0.40 0.80 0.55 0.16 0.23 0.29 0.41 0 0.15 0.12 0.17 2.57 Cs 0 0 0 0 0 0 0.019 0 0.005 0.013 0.044 0.019 0.045 0.16 0 Ba 2.40 0.90 0 0 1.00 3.42 0.55 0 0 0.61 0 0 1.15 0.49 25.6 La 2.80 1.10 1.00 1.20 1.40 1.36 0.91 0.90 0.92 1.05 0.46 0.55 0.51 0.46 1.06 Ce 8.70 3.70 3.60 3.90 4.70 4.58 3.65 3.58 3.41 3.83 2.40 2.51 2.43 2.44 2.52 Pr 1.30 0.60 0.70 0.70 0.70 0.82 0.68 0.53 0.68 0.77 0.45 0.67 0.57 0.46 0.58 Nd 7.60 4.60 4.10 3.60 4.50 4.86 4.05 4.11 4.01 4.46 3.32 3.47 3.57 4.18 5.03 Sm 2.20 1.50 1.10 1.80 1.90 2.00 1.55 1.18 1.23 2.15 2.15 1.70 1.67 2.12 1.38 Eu 0.80 0.70 0.80 0.50 0.70 0.89 0.69 0.48 0.61 0.73 0.60 0.81 0.74 0.58 0.78 Gd 3.10 2.00 3.10 3.30 2.40 3.03 2.70 2.63 2.55 3.01 3.19 2.60 3.06 2.26 3.31 Tb 0.50 0.50 0.50 0.40 0.50 0.52 0.55 0.44 0.44 0.48 0.47 0.57 0.55 0.46 0.45 Dy 3.70 3.00 3.20 3.30 3.60 3.54 3.14 3.10 3.12 3.34 3.31 3.65 3.51 3.60 3.82 Ho 0.70 0.70 0.80 0.60 0.70 0.69 0.64 0.65 0.68 0.69 0.80 0.76 0.88 0.72 0.90 Er 1.90 2.30 2.10 2.10 2.20 2.02 1.95 2.17 2.20 2.13 2.51 2.26 2.48 2.31 2.69 Tm 0.30 0.30 0.30 0.20 0.30 0.31 0.29 0.25 0.33 0.36 0.30 0.36 0.34 0.36 0.43 Yb 1.70 1.90 2.10 1.70 1.70 1.65 1.90 2.19 1.75 1.62 1.88 2.29 2.20 2.57 2.49 Lu 0.20 0.20 0.20 0.30 0.20 0.28 0.25 0.26 0.25 0.29 0.34 0.29 0.30 0.32 0.35 Hf 1.20 1.00 0.80 1.00 0.90 1.02 0.90 0.91 1.05 0.89 0.72 0.84 1.23 0.79 0.86 Ta 0.10 0 0 0 0 0.037 0 0.020 0.037 0.076 0.027 0.005 0.017 0 0.079 Pb 0.10 0 0.10 0 0 0.004 0.094 0.054 0.10 0.015 0.18 0.19 0.080 0.050 0.86 Th 0.10 0.10 0 0 0 0.015 0.024 0 0.034 0.012 0.040 0.055 0 0.017 0.091 U 0.019 0.041 0 0.039 0.027 0.006 0.033 0.032 0 0.046 0.065 0.027 0.032 0 0.023 (La/Yb)N 1.12 0.39 0.32 0.48 0.56 0.56 0.33 0.28 0.36 0.44 0.17 0.16 0.16 0.12 0.29
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附表 6 单斜辉石Sr同位素组成
附表 6. Sr isotopic compositions of clinopyroxenes from the Jining peridotite xenoliths
样品号 类型 标注 Sr (×10-6) Rb (×10-6) Rb/Sr 87Sr/86Sr 2σ 84Sr/86Sr 2σ 85Rb/86Sr 2σ MLGT07-1 第一类 海绵边 192 4.730 0.024 6 0.704 2 0.000 6 0.061 3 0.000 6 0.478 7 0.018 2 边 133 0.003 0 0.704 6 0.000 7 0.073 6 0.001 0 0.000 1 0.000 6 核 133 0.140 0.001 0 0.704 0 0.000 7 0.070 0 0.001 1 0.019 2 0.002 0 边 123 0.003 0 0.704 3 0.000 7 0.070 6 0.001 2 0.000 1 0.000 9 MLGT01 第二类 边 174 2.680 0.015 4 0.703 8 0.000 4 0.067 0 0.000 5 0.290 4 0.014 2 核 264 0 0 0.703 5 0.000 2 0.063 9 0.000 3 0 0.000 1 边 255 0.120 0 5 0.703 8 0.000 2 0.063 1 0.000 4 0.008 6 0.001 3 MLGT11 第二类 边 140 0 0 0.703 0 0.000 6 0.070 0 0.001 0 0.000 8 0.000 4 核 142 0.004 0 0.702 4 0.000 6 0.070 9 0.001 0 0.000 1 0.000 4 边 147 0.010 0.000 1 0.702 9 0.000 5 0.065 5 0.000 9 0.001 0 0.000 8 海绵边 116 1.910 0.016 4 0.703 5 0.000 7 0.073 9 0.001 2 0.322 9 0.014 2 MLGT18 第二类 边 73.2 0.520 0.007 1 0.703 8 0.000 8 0.092 3 0.000 7 0.149 5 0.006 1 102 0.004 0 0.702 4 0.000 7 0.082 3 0.000 5 0.000 3 0.000 4 核 101 0.004 0 0.703 2 0.000 6 0.082 2 0.000 5 0.000 3 0.000 4 101 0.016 0.000 2 0.702 4 0.000 6 0.081 4 0.000 5 0.002 5 0.000 5 边 146 4.390 0.030 1 0.704 4 0.000 4 0.068 9 0.000 5 0.641 4 0.010 8
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表 5 尖晶石主量元素 (%) 和微量元素 (10-6) 组成
Table 5. Major oxides (%) and trace element (10-6) compositions of spinels from the Jining peridotite xenoliths
样品 MLGT01 MLGT02 MLGT07-1 MLGT11 MLGT13 MLGT17 MLGT18 MLGT21 SiO2 0.27 0.23 0.13 0.230 0.25 0.230 0.21 0.160 TiO2 0.23 0.22 0.09 0.200 0.47 0.190 0.19 0.100 Na2O 0.00 0.00 0.00 0.000 0.01 0.000 0.00 0.000 MgO 21.10 20.80 17.10 21.900 16.20 21.800 22.60 23.200 Al2O3 47.50 46.70 36.60 49.400 26.10 51.600 53.60 55.500 K2O 0.00 0.00 0.00 0.000 0.01 0.000 0.00 0.000 CaO 0.00 0.02 0.02 0.000 0.01 0.000 0.00 0.000 MnO 0.10 0.10 0.13 0.100 0.13 0.100 0.10 0.100 FeO 12.30 12.80 14.80 11.800 13.70 11.500 10.80 12.400 Mg# 75.40 74.30 67.40 76.800 67.70 77.200 78.90 77.000 Cr# 19.90 20.70 35.40 17.500 51.90 15.200 12.70 8.600 Li 0.85 0.65 1.53 0.047 0.99 0.090 0.13 0.090 Sc 1.24 1.20 1.59 1.750 3.92 0.830 0.74 0.000 V 487.00 514.00 884.00 438.000 791.00 438.000 418.00 385.000 Co 188.00 190.00 259.00 203.000 189.00 205.000 203.00 271.000 Ni 2 694.00 2 741.00 1 836.00 2 941.000 1 382.00 2 922.000 2 941.00 3 812.000 Cu 3.69 3.75 3.97 3.820 1.60 4.710 1.44 4.330 Zn 561.00 515.00 1 308.00 666.000 650.00 687.000 656.00 1 052.000
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