About 2.5 Ga Tectono-Metamorphic Event in Southern Margin of North China Craton and Its Significance
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摘要: 林山岩群是华北克拉通中部造山带南缘前寒武纪结晶基底的一部分,它对于探讨中部造山带碰撞时代及其在克拉通南缘的分布具有重要意义.选择林山岩群主体的变基性岩(斜长角闪片岩)为主要研究对象,利用锆石U-Pb定年和岩石地球化学方法,获得的结果表明斜长角闪片岩样品锆石多呈长柱状,且外形不规则,具弱分带、斑杂状分带和扇形分带结构,其中少量锆石保留有早期原岩残留的岩浆核.锆石核部具岩浆振荡环带特征,大部分Th/U比值范围为0.10~9.24,且外形不规则,边部具溶蚀结构;绝大部分锆石具弱分带、斑杂状分带和扇形分带结构,以及低Th/U比值范围为0~0.09,个别比值为0.12,显示为典型的变质锆石特征.LA-ICP-MS锆石U-Pb定年结果表明该斜长角闪片岩的核部残留加权平均年龄为2 528±43 Ma(MSWD=1.5,n=10),经历变质作用的加权平均时限为2 474±22 Ma(MSWD=1.3,n=21).全岩地球化学结果显示林山岩群变基性岩贫硅(47.70%~50.77%,平均值为48.90%)和低钾(0.56%~1.78%,平均值为1.13%),轻、重稀土分异较弱,亏损微量元素Nb、Th、Ti、Zr等高场强元素,且具有低的微量元素Zr含量(<130×10-6)和Zr/Y比值(<4).这些特征表明林山岩群形成于俯冲作用背景下的岛弧环境.因此,上述证据共同反映了华北克拉通东、西陆块碰撞产物的中部造山带经历了新太古代晚期-古元古代早期的俯冲碰撞造山作用.Abstract: Linshan Group, located in the southern margin of the central orogenic belt of the North China Craton, is a Precambrian basement. It is important to study the collision era of the central orogenic belt and the distribution of the southern margin of the North China Craton. A study was carried out on the metabasite (plagioclase-amphibole schist) of the Linshan Group for the purpose of constraining the collisional time of the central orogenic belt and its distribution through the zircon U-Pb dating and rock geochemical methods. The results obtained show that most of zircon grains from plagioclase-amphibole schist are long columnar, euhedral to subhedral, and show typical core-rim structure with irregular shape, weak zoning, taxitic zoning and sector zoning structure. Some zircons preserve the inherited cores of the early magma. Zircon rims display characteristics of dissolution texture with low Th/U ratios (most of them less than 0.09), however, zircons' cores show typical oscillatory zoning structure and relatively high Th/U ratios ranging from 0.10 to 9.24. The evidence suggests that the zircons of plagioclase-amphibole schist could be metamorphic origin. Relict cores and rims of the zircons from the plagioclase-amphibole schist yield ages of 2 528±43 Ma (MSWD=1.5, n=10) and 2 474±22 Ma (MSWD=1.3, n=21), respectively. The former data represent residual age of protolith, and the latter indicate a circa 2.5 Ga metamorphic event in the central orogenic belt of the North China Craton. Whole-rock geochemical results show that metabasite samples from the Linshan Group have relatively low contents of SiO2 (47.70%-50.77%, average=48.90%) and K2O (0.56%-1.78%, average=1.13%), and are depleted in high field strength elements (eg., Nb, Th, Ti and Zr) with flat REE patterns. Moreover, the geochemical samples have low content of Zr (less than 130×10-6) and ratios of Zr/Y (less than 4), indicating that the Linshan Group could have been formed in the subducted-related island arc environment. Therefore, the above evidence show that the central orogenic belt that formed by the collision orogenesis between eastern block and western block of the North China Craton experienced late Neoarchean to early Paleoproterozoic subduction-collisional event.
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Key words:
- early Paleoproterozoic /
- metamorphic event /
- Linshan Group /
- North China Craton /
- central orogenic belt /
- isotope /
- tectonics
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图 1 华北克拉通构造分区(a)和变质基底分布(b)
Fig. 1. Tectonic subdivision (a) and distribution of the exposed basement (b) of the North China Craton
图 4 斜长角闪片岩Zr/TiO2-Nb/Y判别图解
据Winchester and Floyd(1977);其中2个样品(灰色三角形,下同)可能遭受了部分熔融作用影响
Fig. 4. Zr/TiO2 vs.Nb/Y discriminant diagram for the plagioclase-amphibole schist of the Linshan Group
图 5 斜长角闪片岩稀土元素配分图(a)和微量元素蛛网图(b)
球粒陨石和原始地幔标准化数据来自Sun and McDonough(1989);灰色线可能遭受了部分熔融作用
Fig. 5. Chondrite-(a) and primitive mantle-(b) normalized diagrams for plagioclase-amphibole schist of Linshan Group
图 10 林山岩群斜长角闪片岩构造环境判别
a.Nb-Zr判别图解,修编自Le et al.(1983);b.Hf/3-Th-Nb判别图解,修编自Wood(1980);c.不活动元素构造环境判别图解,修编自Agrawal et al.(2008);d.Th/Yb-La/Yb判别图解,修编自Condie(1989).N-MORB.N型洋中脊玄武岩;IAT.岛弧拉斑玄武岩;CAB.钙碱性玄武岩;E-MORB+WPT.E型洋中脊玄武岩和板内拉斑玄武岩;WAPB.碱性板内玄武岩;IAB.岛弧玄武岩;OIB.洋岛玄武岩;CRB.大陆裂谷玄武岩;PA.初始岛弧;IA.岛弧;CMA.大陆边缘弧;AA.安第斯岛弧
Fig. 10. Tectonic discriminant diagrams for plagioclase-amphibole schist of Linshan Group
表 1 林山岩群斜长角闪片岩主量(%)及微量元素(10-6)分析结果
Table 1. Major element (%) and trace element (10-6) compositions of plagioclase-amphibole schist of Linshan Group
样品 斜长角闪片岩 斜长角闪片岩 斜长角闪片岩 D025/74-1 D026/112-1 D029/84-1 D030/131-1 D135/13-1 D135/20-1 D136/72-1 D703/57-1 D745/6-1 SiO2 50.77 47.73 48.94 48.15 49.65 48.60 48.05 48.98 49.23 Al2O3 13.73 13.83 14.08 13.89 12.34 13.67 15.21 13.41 13.09 TiO2 0.99 1.55 1.55 1.23 1.70 0.78 1.00 0.78 1.14 Fe2O3 2.76 4.65 7.00 4.29 6.20 3.30 3.87 3.61 4.91 FeO 9.18 10.93 7.60 8.40 9.75 7.85 8.00 8.30 8.85 CaO 9.97 8.10 12.86 8.74 7.66 10.16 8.31 10.67 9.36 MgO 7.00 5.61 3.47 8.11 4.71 7.87 7.05 7.36 6.25 K2O 0.71 1.33 0.56 1.50 1.45 1.42 1.87 0.56 0.80 Na2O 1.96 2.65 1.20 2.22 2.14 2.07 1.96 2.12 1.92 MnO 0.20 0.76 0.28 0.23 0.32 0.41 0.36 0.24 0.24 P2O5 0.09 0.14 0.14 0.09 0.21 0.10 0.16 0.09 0.13 H2O+ 1.66 1.75 2.02 2.92 2.54 2.59 3.00 2.58 2.90 H2O- 0.20 0.25 0.08 - 0.26 0.19 0.33 0.23 0.44 灼失量 2.48 2.51 1.46 2.22 1.75 1.92 2.23 1.92 1.97 Rb 53.50 65.50 28.28 89.83 47.98 42.37 109.28 12.29 44.60 Ba 19.74 66.21 9.21 36.10 58.85 86.55 73.38 32.64 32.86 Th 9.79 8.13 10.36 17.56 20.60 7.36 11.44 6.00 9.64 U 8.56 7.19 17.27 13.96 19.56 8.08 7.68 9.41 14.14 Nb 5.25 6.81 7.92 7.42 9.24 3.31 5.15 3.16 7.29 Ta 7.60 13.18 11.65 12.32 17.53 8.37 7.94 8.21 11.39 La 8.35 10.08 11.42 8.17 18.44 6.37 13.94 9.54 10.57 Ce 7.73 9.03 10.13 7.93 14.56 5.22 10.80 7.22 8.52 Pr 7.49 9.14 10.77 7.87 14.09 5.46 10.24 6.73 8.62 Sr 5.89 8.42 9.77 8.75 8.60 15.89 11.98 8.48 7.07 Nd 7.03 8.58 10.91 7.67 12.42 5.09 8.96 5.84 7.80 Zr 7.68 7.21 9.33 7.13 10.22 4.55 6.82 4.07 6.36 Hf 12.90 21.56 21.49 15.61 16.93 8.32 11.78 7.32 10.17 Sm 6.20 7.45 10.13 7.01 11.72 5.25 7.63 5.53 7.98 Eu 6.64 7.84 8.68 6.07 9.34 4.80 6.88 5.25 6.94 Gd 5.16 5.74 9.36 5.89 9.64 4.67 5.78 4.68 6.69 Dy 6.38 6.97 9.40 5.50 9.16 4.53 5.06 4.47 6.54 Y 4.96 5.56 8.08 4.23 7.74 3.72 4.09 3.56 5.41 Ho 5.87 6.46 9.35 4.93 9.08 4.16 4.62 4.13 6.11 Yb 5.56 5.85 8.77 4.04 7.34 3.70 3.92 3.67 5.49 La 5.41 6.53 7.40 5.30 11.95 4.13 9.03 6.18 6.85 Ce 12.95 15.13 16.97 13.28 24.38 8.75 18.09 12.09 14.27 Pr 1.90 2.32 2.74 2.00 3.58 1.39 2.60 1.71 2.19 Nd 8.79 10.72 13.64 9.58 15.52 6.36 11.20 7.30 9.75 Sm 2.52 3.03 4.11 2.84 4.76 2.13 3.10 2.24 3.24 Eu 1.02 1.21 1.34 0.94 1.44 0.74 1.06 0.81 1.07 Gd 2.81 3.13 5.09 3.20 5.25 2.54 3.15 2.55 3.64 Tb 0.60 0.67 0.94 0.57 0.97 0.47 0.56 0.47 0.69 Dy 4.30 4.70 6.34 3.71 6.17 3.06 3.41 3.01 4.41 Ho 0.87 0.96 1.39 0.73 1.35 0.62 0.69 0.62 0.91 Er 2.31 2.49 4.11 1.88 3.77 1.84 2.04 1.83 2.70 Tm 0.43 0.45 0.62 0.29 0.54 0.27 0.29 0.26 0.39 Yb 2.45 2.58 3.87 1.78 3.24 1.63 1.73 1.62 2.42 Lu 0.34 0.33 0.58 0.26 0.49 0.24 0.27 0.25 0.38 Y 21.32 23.90 34.75 18.20 33.27 16.01 17.58 15.29 23.28 ∑REE 68.04 78.14 103.90 64.56 116.70 50.16 74.78 56.22 76.18 LREE/HREE 1.35 1.53 1.18 1.65 1.71 1.33 2.21 1.70 1.43 (La/Yb)CN 1.49 1.71 1.29 2.01 2.50 1.71 3.53 2.58 1.91 δEu 1.14 1.17 0.87 0.92 0.85 0.94 1.01 1.00 0.92 注:样品均为国土资源部武汉矿产资源监督检测中心测试;其中“-”为未分析. 表 2 林山岩群斜长角闪片岩样品(D029/84-1) LA-ICP-MS残留核部锆石U-Pb定年结果
Table 2. Sample D029/84-1 LA-ICP-MS U-Pb results of relict cores of the zircon from the plagioclase-amphibole schist of Linshan Group
点号 含量(10-6) Th/U U-Th-Pb同位素比值±1σ 同位素年龄±1σ(Ma) 232Th 238U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U D84-1-04 1.76 18.48 0.10 0.160 0±0.005 0 10.97±0.34 0.480±0.008 2 502.0±52.8 2 521.0±28.8 2 546.0±33.0 D84-1-06 0.42 6.72 0.06 0.190 0±0.008 0 13.49±0.54 0.530±0.010 2 744.0±68.8 2 714.0±38.0 2 736.0±40.2 D84-1-08 1.31 7.25 0.18 0.170 0±0.009 0 11.60±0.55 0.510±0.010 2 554.0±79.5 2 573.0±44.4 2 651.0±42.8 D84-1-09 9.39 67.74 0.14 0.160 0±0.003 0 11.77±0.19 0.520±0.004 2 502.0±27.5 2 586.0±15.0 2 687.0±17.1 D84-1-13 0.10 5.36 0.02 0.170 0±0.008 0 11.77±0.54 0.500±0.011 2 583.0±75.2 2 586.0±43.0 2 622.0±48.4 D84-1-14 35.12 3.80 9.24 0.180 0±0.026 0 11.09±0.70 0.480±0.014 2 627.0±248 2 530.0±58.5 2 543.0±62.0 D84-1-22 8.63 47.68 0.18 0.160 0±0.003 0 11.86±0.25 0.520±0.006 2 506.0±33.3 2 594.0±20.2 2 700.0±25.0 D84-1-24 0.20 16.84 0.01 0.170 0±0.004 0 11.13±0.27 0.490±0.006 2 525.0±42.6 2 534.0±22.7 2 552.0±26.7 D84-1-30 0.09 4.91 0.02 0.180 0±0.015 0 11.79±0.82 0.490±0.015 2 696.0±138.0 2 588.0±65.0 2 592.0±63.0 D84-1-43 9.22 65.30 0.14 0.170 0±0.005 0 11.86±0.35 0.510±0.006 2 521.0±49.0 2 594.0±28.0 2 663.0±26.0 表 3 林山岩群斜长角闪片岩样品(D029/84-1) LA-ICP-MS变质锆石U-Pb定年结果
Table 3. Sample D029/84-1 LA-ICP-MS U-Pb result of rims of the zircon from the plagioclase-amphibole schist of Linshan Group
点号 含量(10-6) Th/U U-Th-Pb同位素比值±1σ 同位素年龄±1σ(Ma) 232Th 238U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U D84-1-02 0.37 23.91 0.015 0.163 6±0.003 7 11.61±0.26 0.520±0.006 2 494.0±37.7 2 574.0±20.6 2 679.0±25.5 D84-1-10 0 7.91 0.000 0.169 2±0.007 1 11.64±0.43 0.520±0.010 2 550.0±70.4 2 576.0±34.7 2 697.0±42.0 D84-1-12 0.21 26.71 0.008 0.157 9±0.003 7 9.95±0.23 0.460±0.005 2 435.0±39.2 2 430.0±21.4 2 425.0±22.5 D84-1-15 10.16 122.05 0.083 0.162 5±0.002 3 10.28±0.15 0.460±0.003 2 483.0±24.1 2 460.0±13.4 2 426.0±14.2 D84-1-16 2.38 58.70 0.041 0.164 3±0.002 9 11.15±0.20 0.490±0.004 2 502.0±29.6 2 535.0±16.6 2 572.0±18.4 D84-1-17 0.03 13.39 0.002 0.176 4±0.004 9 11.78±0.34 0.490±0.006 2 620.0±46.6 2 587.0±27.2 2 552.0±27.7 D84-1-18 0.15 4.83 0.031 0.163 6±0.009 1 9.96±0.49 0.460±0.010 2 494.0±93.8 2 431.0±45.7 2 444.0±43.2 D84-1-23 0.02 7.74 0.003 0.161 3±0.006 4 11.49±0.42 0.530±0.010 2 469.0±67.6 2 564.0±34.2 2 749.0±40.6 D84-1-25 18.07 151.00 0.120 0.158 2±0.001 9 11.62±0.16 0.530±0.004 2 437.0±20.0 2 574.0±13.0 2 731.0±19.0 D84-1-26 6.44 67.60 0.095 0.155 5±0.002 9 11.49±0.23 0.530±0.006 2 409.0±32.0 2 564.0±19.0 2 753.0±27.0 D84-1-28 0.28 23.80 0.012 0.163 4±0.004 7 10.60±0.31 0.470±0.006 2 492.0±48.0 2 489.0±27.0 2 486.0±25.0 D84-1-29 0.69 25.30 0.027 0.157 9±0.004 7 11.69±0.33 0.540±0.007 2 433.0±50.0 2 580.0±27.0 2 777.0±28.0 D84-1-32 0.16 8.87 0.018 0.155 3±0.008 4 9.74±0.50 0.470±0.008 2 405.0±92.0 2 411.0±48.0 2 464.0±37.0 D84-1-33 0.18 12.80 0.014 0.175 9±0.012 2 11.41±0.76 0.480±0.011 2 617.0±115.0 2 557.0±62.0 2 540.0±46.0 D84-1-34 0.03 21.90 0.001 0.158 3±0.004 7 9.94±0.26 0.460±0.005 2 439.0±50.0 2 429.0±24.0 2 431.0±24.0 D84-1-38 0.24 24.40 0.010 0.167 4±0.006 2 10.98±0.40 0.470±0.007 2 531.0±62.0 2 521.0±34.0 2 493.0±30.0 D84-1-40 0.11 51.10 0.002 0.163 7±0.004 2 11.36±0.29 0.500±0.006 2 495.0±44.0 2 553.0±24.0 2 608.0±25.0 D84-1-44 0.03 28.30 0.001 0.163 2±0.006 4 10.46±0.43 0.460±0.006 2 500.0±66.0 2 476.0±38.0 2 439.0±27.0 D84-1-46 0.82 18.70 0.044 0.166 1±0.006 0 10.71±0.38 0.470±0.006 2 518.0±66.0 2 498.0±33.0 2 470.0±27.0 D84-1-47 0.10 11.10 0.009 0.164 8±0.008 1 9.62±0.48 0.430±0.009 2 505.0±83.0 2 400.0±46.0 2 298.0±39.0 D84-1-48 0.20 16.60 0.012 0.164 5±0.005 8 10.40±0.36 0.460±0.007 2 502.0±59.0 2 471.0±32.0 2 438.0±31.0 -
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