Chronology and Geochemistry on Mesozoic Diorite from the Xi′anli Iron Ore Area in Pingshun, Shanxi Province
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摘要: 山西平顺地区位于大型宽缓的太行山复式背斜的西翼，大地构造位置属吕梁-太行断块的太行块隆的东南部，是华北地区重要的矽卡岩铁矿矿集区，中生代闪长质岩石是本区矽卡岩型铁矿重要的成矿母岩。本研究对其进行锆石SHRIMP年龄测定和地球化学分析，结果显示辉长岩和闪长岩的锆石年龄分别为123 Ma和126 Ma，两者侵位时代基本一致。地球化学分析显示区内岩浆岩主要为准铝质高钾钙碱性系列岩石，所有样品(二峰山闪长岩、西安里辉长岩和闪长岩)均有非常相似的稀土配分模式，富集轻稀土元素(∑LREEs平均值分别为94.64 μg/g、110.73 μg/g、118.63 μg/g)，轻重稀土分馏不是很强烈，(La/Yb)N平均值分别为9.47、9.17、9.70；Eu异常不明显(δEu平均值分别为1.00、0.96、1.04)，富集Ba、Th、U等大离子亲石元素，具有高Sr特征，所有岩性强烈亏损Nb、Ta等高场强元素。研究认为岩体主要来自幔源岩浆与壳源酸性岩浆的混合作用，样品高的Nb/Ta(17~22，平均19)以及Zr/Hf值(35~40，平均37)是继承了岩浆源区高Nb/Ta和Zr/Hf比值特征，表明地幔源区受到俯冲板片熔融体/流体的交代。其地球动力学背景为华北克拉通中生代破坏和岩石圈减薄事件，但是应该注意华北克拉通破坏和岩石圈减薄机制的多样性。Abstract: The Shanxi Pingshun region is located in the west limb of a large-scale anticline of Taighang Mountain and is to the southeast of the Taihang upwell of Lüliang-Taihang fault block. It is one of the most important skarn iron ore concentration areas in North China. The Mesozoic dioritic rock was the source rock for skarn Fe deposits. In this paper, the work carried out on zircon SHRIMP dating and geochemical analysis of Mesozoic magmatic rocks is described. The results of zircon ages for the gabbro and diorite were 123 Ma and 126 Ma, respectively (within the same intrusion periods). Magmatic rocks in the region were metaluminous high-K calc-alkaline series rocks and all the samples (Erfengshan diorite, Xi′anli gabbro and diorite) were characterized by similar REE patterns with enriched LREE (ΣLREE on average is 94.64 μg/g, 110.73 μg/g and 118.63 μg/g). The fractionation between LREE and HREE was not very strong since (La/Yb)N on average were 9.47, 9.17 and 9.70. The Eu anomaly was not obvious as δEu on average were 1.00, 0.96 and 1.04. The gabbro and diorite were enriched Ba, Th, U, and other LILEs had the characteristic of high Sr and strongly depleted HFSEs (Nb, Ta). Combined with previous research results, indications are that the magmatic rocks were mainly from the mixing members between mantle-derived magma and the low crust-derived magma. High Nb/Ta (17 to 22, on average is 19) and Zr/Hf values (35 to 40, on average is 37) were inherited from the magmatic source features. This indicated that the mantle source was replaced by subducted slab melt/fluid. The geodynamic setting is Mesozoic destruction and a lithospheric thinning event in the North China Craton. However, the diversity of the mechanism should also be noted.
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Key words:
- North China /
- iron ore /
- mesozoic /
- diorite /
- SHRIMP U-Pb dating /
- geochemical characteristics
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表 1 平顺地区闪长质岩体岩石样品主量元素、稀土及微量元素分析结果
Table 1. Analytical results of major oxides and trace elements for Pingshun dirite
主量元素 wB/% E01-2
闪长岩E05-1
石英正长岩E07-1
石英正长岩P23-1
辉长岩P44-1
辉长岩P47-1
辉长岩P49-1
辉长岩P13-1
闪长岩P17-1
闪长岩P33-1
闪长岩P34-1
闪长岩P34-2
闪长岩P39-1
闪长岩SiO2 62.84 67.52 66.19 52.98 51.17 52.61 50.34 57.19 55.34 56.21 59.45 54.11 57.96 Al2O3 17.58 17.69 17.41 13.8 13.97 14.25 11.56 18.53 17.54 17.52 17.12 16.61 17.20 TFe2O3 4.27 1.34 1.46 8.25 11.43 10.06 9.36 6.76 7.72 7.62 6.61 8.4 6.82 CaO 4.84 2.41 2.35 7.94 8.13 7.29 7.35 6.47 6.83 6.60 5.60 6.92 5.92 MgO 1.20 0.66 0.91 8.67 6.81 5.71 13.71 2.02 3.39 2.81 2.74 4.77 2.97 K2O 2.98 2.37 1.54 1.79 2.19 2.65 1.17 2.00 2.19 2.35 2.82 2.56 2.62 Na2O 5.12 6.73 9.28 3.29 2.31 2.62 2.54 4.47 3.98 3.76 3.85 3.97 3.76 TiO2 0.36 0.25 0.26 0.57 1.14 0.95 0.66 0.47 0.47 0.53 0.49 0.62 0.49 MnO 0.11 0.03 0.04 0.15 0.14 0.12 0.17 0.08 0.17 0.15 0.13 0.15 0.14 P2O5 0.22 0.11 0.16 0.25 0.19 0.20 0.28 0.31 0.32 0.30 0.26 0.30 0.28 Mg# 40 53 59 71 58 57 77 41 50 46 49 57 50 LOI 0.33 1.20 0.87 1.67 2.01 3.00 2.44 1.83 1.38 1.58 0.78 1.36 1.21 总计 99.85 100.31 100.47 99.36 99.49 99.46 99.58 100.13 99.33 99.43 99.85 99.77 99.37 稀土及
微量元素wB/(μg·g-1) E01-2
闪长岩E05-1
石英正长岩E07-1
石英正长岩P23-1
辉长岩P44-1
辉长岩P47-1
辉长岩P49-1
辉长岩P13-1
闪长岩P17-1
闪长岩P33-1
闪长岩P34-1
闪长岩P34-2
闪长岩P39-1
闪长岩Y 15.0 13.8 11.1 14.4 17.6 17.0 15.3 16.4 16.6 16.6 14.4 15.4 15.0 La 27.2 13.7 17.8 23.2 18.2 21.0 18.0 25.7 23.5 22.8 22.4 20.4 22.5 Ce 50.8 23.9 34.2 48.1 40.4 45.8 40.6 54.3 49.9 47.2 46.0 46.0 46.5 Pr 6.24 3.85 4.79 5.66 5.16 5.60 5.26 6.37 6.09 5.60 5.39 5.74 5.50 Nd 23.7 14.9 17.7 22.0 21.4 23.0 22.7 25.9 24.6 22.2 20.6 23.1 21.9 Sm 4.65 2.94 3.29 4.26 4.82 5.05 4.67 5.06 4.84 4.32 4.07 4.55 4.23 Eu 1.46 0.93 1.08 1.37 1.57 1.56 1.41 1.77 1.59 1.43 1.35 1.46 1.40 Gd 4.21 2.94 2.89 4.14 4.79 4.95 4.47 4.47 4.35 3.97 3.82 4.24 3.92 Tb 0.55 0.42 0.39 0.54 0.66 0.67 0.58 0.63 0.63 0.60 0.50 0.58 0.53 Dy 2.9 2.45 2.12 2.88 3.61 3.51 3.12 3.32 3.39 3.36 2.86 3.13 2.95 Ho 0.58 0.50 0.43 0.57 0.71 0.71 0.61 0.65 0.69 0.67 0.57 0.62 0.6 Er 1.69 1.57 1.36 1.68 1.98 2.01 1.69 1.95 2.09 1.96 1.65 1.78 1.73 Tm 0.24 0.23 0.19 0.22 0.26 0.27 0.24 0.28 0.29 0.27 0.25 0.25 0.24 Yb 1.63 1.56 1.26 1.45 1.68 1.72 1.49 1.76 1.86 1.78 1.51 1.61 1.66 Lu 0.23 0.24 0.21 0.21 0.25 0.25 0.22 0.26 0.28 0.27 0.24 0.24 0.26 Li 1.21 19.2 3.49 12.9 6.32 12.9 7.79 5.85 13.2 19.3 14.8 17.6 16.9 Be 1.64 1.21 1.69 1.19 1.02 1.24 0.76 1.29 1.27 1.15 1.48 1.32 1.50 Sc 6.68 2.93 5.10 25.4 55.3 46.5 27.6 11.0 17.6 17.1 15.0 25.3 15.4 V 90.2 40.00 54.2 172 297 240 192 118 166 158 134 204 141 Cr 15.4 6.87 5.28 325 73.8 65.5 668 18.3 37.2 11.4 28.2 104 33.9 Co 7.18 2.52 2.93 40.4 39.9 35.3 57.2 11.5 19.6 19.4 15.4 26.1 17.3 Ni 3.8 3.44 2.95 271 21.6 20.7 537 11.2 20.3 9.12 15.7 58.0 18.7 Cu 3.78 7.69 56.5 605 23.7 20.4 68.5 3.98 40.8 15.8 13.0 33.5 21.7 Zn 45.3 28.00 13.3 93.0 79.9 66.1 98.8 30.6 81.5 81.0 72.0 99.2 95.2 Ga 19.9 19.7 18.1 17.2 18.6 18.3 14.9 21.6 20.4 21.0 19.3 19.0 19.7 Rb 28.2 23.5 16.1 37.0 28.0 36.2 20.3 16.0 36.9 42.0 51.0 46.0 44.4 Sr 982 615 354 691 463 647 558 1003 1036 776 734 819 770 Zr 130 120.0 113 100 92.0 102 83.8 87.9 117 106 111 85.3 118 Nb 5.23 6.52 4.77 4.05 3.46 3.75 3.70 3.42 3.79 3.78 4.19 4.56 4.03 Cd 0.05 0.05 0.05 0.09 0.06 0.05 0.13 0.05 0.06 0.06 0.07 0.08 0.07 Cs 0.32 1.21 0.45 1.16 0.2 0.19 0.98 0.26 0.57 0.85 0.98 1.16 1.50 Ba 1203 1187 659 829 686 888 458 1018 842 974 1022 1203 958 Hf 3.34 3.16 2.85 2.58 2.56 2.74 2.32 2.45 3.31 2.86 2.99 2.36 3.03 Ta 0.26 0.34 0.24 0.22 0.18 0.20 0.19 0.17 0.21 0.17 0.25 0.24 0.22 Pb 8.10 11.4 2.22 10.3 4.48 3.30 4.82 3.43 6.20 7.35 9.35 4.49 7.49 Th 3.44 1.64 2.23 2.66 1.72 1.98 1.66 3.23 1.99 1.68 2.47 1.97 2.60 U 0.81 0.48 0.73 0.72 0.44 0.52 0.43 0.97 0.58 0.48 0.81 0.43 0.62 注：LOI—烧失量。Mg#=100×Mg/(Mg+∑Fe)，原子比。TZr(℃)=12900/[2.95(0.85M+ln(496000/Zrmelt)],M=(Na+K+2Ca)/(Al×Si)，原子比，见Watson等(1983年)。 
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