Geochemical Characteristics and Provenance Analysis of Middle Jurassic Xintiangou Formation in Dijiang-Changshou Area
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摘要:
笔者以川东地区垫江-长寿一带新田沟组为研究对象，旨在研究新田沟组碎屑岩物质来源及源区构造环境，为进一步研究四川盆地东部侏罗系湖盆演化提供依据。笔者在垫江县和长寿区各测制1条剖面，了解了新田沟组岩性特征和沉积环境，并在两条剖面上采集了28件地球化学样品，所有样品均进行全岩主量、微量和稀土元素分析测试。其中，Al2O3/TiO2值和La/Th-Hf图解、Co/Th-La/Sc图解均指示源岩为长英质岩石、安山质岩石和古老沉积物。稀土元素La、Lan/Ybn、ΣLREE/ΣhREE值、La/Y—Sc/Cr图解；主量元素TFe2O3+ MgO、SiO2/Al2O3、K2O/Na2O等的平均值、 K2O/Na2O-SiO2判别图解；微量元素Sc/Cr、Zr/Hf等比值和Th-Co-Zr/10、La-Th-Sc、Th-Sc-Zr/10等构造环境判别图解，显示源区构造环境为大陆岛弧和被动大陆边缘。结合前人研究成果，可知研究区新田沟组物质来源于南秦岭-大巴山地区，物源主要为长英质岩石、安山质岩石和古老沉积物；物源区构造背景为南秦岭大巴山不同构造阶段的大陆岛弧环境和被动大陆边缘。
Abstract:This paper takes the Xintiangou Formation in Dianjiang-Changshou area of eastern Sichuan as the research object, aiming at studying the source of clastic rocks and the tectonic environment of the source area in Xintiangou Formation, and provides a basis for further study of Jurassic lake basin evolution in eastern Sichuan Basin. In this paper, one profile of Xintiangou Formation was measured in Dianjiang County and Changshou District, respectively, understanding the lithologic characteristics and sedimentary environment of Xintiangou Formation.28 geochemical samples were collected from 2 sections, and all samples were analyzed for major, trace and rare earth elements. Among them, Al2O3/TiO2, La/Th-Hf and Co/Th-La/Sc diagrams indicate that the source rocks are felsic, andesitic and ancient sediments. Rare earth elements La, Lan/Ybn, ΣLREE/ΣhREE value, La/Y-Sc/Cr diagram, and main elements TFe2O3+MgO, SiO2/Al2O3, K2O/Na2O, et a1 average, K2O/Na2O-SiO2 discriminant diagram, and the discrimination diagrams of Sc/Cr values, Zr/Hf values, et a1 and Th-Co-Zr/10, La-Th-Sc, Th-Sc-Zr/10 tectonic environment shows that tectonic setting of source area is continental island arc and passive continental margin.Combined with previous research results, it can be seen that the material of Xintiangou Formation in the study area comes from the South Qinling-Daba Mountains area, and the materials are mainly felsic rocks, andesitic rocks and ancient sediments. The tectonic setting of the provenance area is the continental island arc environment and passive continental margin of different tectonic stages of the South Qinling-Daba Mountains area.
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Keywords:
- Xintiangou Formation /
- geochemical characteristics /
- provenance /
- tectonic setting
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图 1 研究区大地构造位置图
Ⅳ.羌塘-扬子-华南板块；Ⅳ-4.扬子陆块；Ⅳ-4-2.四川中生代盆地；Ⅳ-4-2-1.万州拗褶带；Ⅳ-4-2-2.华蓥山隆褶带
Figure 1. The geotectonic position of the study area
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图 2 研究区地质简图及剖面位置图
1.下侏罗统蓬莱镇组、遂宁组；2.中侏罗统沙溪庙组、新田沟组；3.下侏罗统自流井组、珍珠冲组；4.三叠系须家河组、巴东组、嘉陵江组；5.地质界线；6.产状；7.背斜；8.向斜；9断层；10.剖面位置
Figure 2. Geological map and section location map of the study area
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图 3 研究区中侏罗统新田沟组星光村实测地层剖面图
Figure 3. The measured stratigraphic profile of Xingguang Village, Xintiangou Formation, Middle Jurassic in the study area
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图 4 星光村新田沟组剖面综合柱状图
Figure 4. Comprehensive histogram of Xintiangou Formation section in Xingguang Village
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图 5 铁门乡新田沟组剖面综合柱状图
Figure 5. Comprehensive histogram of Xintiangou Formation section in Tiemen Township
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图 6 研究区中侏罗统新田沟组铁门乡实测地层剖面图
Figure 6. The measured stratigraphic section of Tiemen Township, Xintiangou Formation, Middle Jurassic in the study area
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图 7 研究区新田沟组碎屑岩La/Y—Sc/Cr判别图
Figure 7. La/Y-Sc/Cr discrimination diagram for clastic rocks of Xintiangou Formationin study area
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图 8 研究区新田沟组碎屑岩K2O/Na2O-SiO2判别图
Figure 8. Discriminant diagram of K2O/Na2O-SiO2 for clastic rocks of Xintiangou Formation in study area
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图 9 新田沟组碎屑岩La-Th-Sc、Th-Sc-Zr/10和Th-Co-Zr/10构造背景判别图
Figure 9. Tectonic setting discrimination diagrams of La-Th-Sc, Th-Sc-Zr/10 and Th-Co-Zr/10 clastic rocks in Xintiangou Formation
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图 10 新田沟组碎屑岩La/Th-Ht判别图和Co/Th-La/Sc判别图
Figure 10. La/Th-Ht discrimination diagram and Co/Th-La/Sc discrimination diagram of clastic rocks in Xintiangou Formation
表 1 研究区新田沟组碎屑岩主量元素含量（%）与化学风化指标统计表
Table 1 Statistical table of major element content (%) and chemical weathering index of clastic rock of Xintiangou Formation in study area
样品编号 岩性 SiO2 Al2O3 TiO2 TFe2O3 MnO MgO CaO Na2O K2O P2O5 LOI CIA ICV CIW PIA XG01-1 页岩 60.14 18.35 0.89 7.10 0.04 2.22 0.63 0.95 2.68 0.13 6.86 77.63 0.62 88.49 86.62 XG01-2 页岩 61.81 16.36 0.80 7.03 0.07 2.31 1.13 1.23 2.18 0.17 6.74 73.08 0.75 81.69 79.25 XG01-3 页岩 60.01 18.59 0.88 6.54 0.03 1.77 0.62 0.67 3.16 0.13 7.59 77.70 0.60 90.66 88.79 XG01-4 页岩 57.82 19.89 0.81 5.67 0.02 1.80 0.60 0.54 3.69 0.17 8.96 78.08 0.54 92.60 90.92 XG01-5 泥岩 60.34 18.00 0.89 6.54 0.04 1.76 0.63 1.39 2.86 0.22 7.01 75.02 0.67 86.14 83.72 XG01-6 砂岩 73.47 12.52 0.83 3.90 0.05 1.03 0.63 2.29 1.50 0.19 3.58 67.33 0.82 73.77 71.00 XG01-7 砂岩 62.22 13.06 0.40 3.68 0.26 1.21 6.74 2.23 2.14 0.11 7.81 57.52 1.70 64.05 59.44 XG01-8 泥岩 64.23 16.04 0.74 6.14 0.03 1.94 0.55 1.12 3.18 0.12 5.88 72.74 0.70 86.20 83.06 XG01-9 泥岩 59.52 16.59 0.77 7.12 0.06 2.55 1.85 1.62 2.93 0.22 6.59 66.15 0.90 75.73 71.62 XG01-10 砂岩 73.13 12.44 0.59 4.12 0.04 1.23 0.58 2.11 1.74 0.16 3.85 67.35 0.80 74.99 71.79 XG01-11 砂岩 75.34 11.41 0.52 3.27 0.04 1.03 0.81 2.53 1.85 0.12 3.08 60.79 0.92 68.05 63.72 XG01-12 粉砂岩 63.88 16.42 0.87 5.68 0.06 2.07 1.00 1.93 3.14 0.16 4.77 67.18 0.81 78.03 73.79 XG01-13 砂岩 72.32 12.35 0.57 4.41 0.06 1.38 0.87 2.51 2.10 0.15 3.12 61.81 0.95 69.74 65.28 XG01-14 砂岩 74.35 11.51 0.87 3.52 0.60 0.82 0.48 1.88 2.03 0.17 3.75 66.63 1.04 76.33 72.30 XG01-15 粉砂岩 46.79 15.63 0.64 6.22 0.12 1.90 9.95 0.40 3.47 0.12 14.75 75.50 1.78 92.23 90.02 XG01-16 砂岩 63.21 10.19 0.30 3.46 0.20 0.92 8.90 2.22 1.97 0.43 8.05 51.89 2.49 58.20 52.41 XG01-17 泥岩 59.06 18.30 0.75 6.38 0.05 2.48 0.86 1.45 3.56 0.17 6.75 71.26 0.71 83.84 80.38 TM02-1 砂岩 72.48 10.18 0.47 8.44 0.03 1.24 0.65 1.31 0.84 0.10 4.27 71.77 1.01 76.70 74.98 TM02-2 页岩 57.07 20.59 0.97 7.20 0.05 2.55 0.66 0.78 3.53 0.19 6.39 77.86 0.60 91.01 89.18 TM02-3 粉砂岩 64.69 16.42 0.81 5.73 0.06 1.48 0.80 1.40 2.20 0.21 6.18 74.45 0.67 83.46 81.19 TM02-4 砂岩 68.14 12.47 0.59 4.08 0.29 1.07 3.51 2.20 1.65 0.14 5.86 58.06 1.31 63.33 59.67 TM02-5 泥岩 57.88 19.54 0.85 7.10 0.03 1.81 0.80 0.61 3.37 0.18 7.81 77.52 0.61 90.63 88.72 TM02-6 粉砂岩 64.25 15.66 0.83 6.28 0.04 1.91 0.85 1.79 2.99 0.17 5.21 68.20 0.83 79.39 75.34 TM02-7 粉砂岩 62.53 16.28 0.76 6.93 0.03 1.94 0.89 1.48 3.32 0.22 5.59 69.54 0.81 82.16 78.20 TM02-8 泥页岩 65.26 11.63 0.45 3.63 0.16 1.23 5.91 2.49 2.37 0.18 6.68 51.99 1.80 58.72 52.58 TM02-9 砂岩 73.40 11.97 0.46 3.61 0.05 1.18 1.41 3.23 1.05 0.11 3.53 57.74 1.01 61.08 58.69 TM02-10 泥岩 67.71 14.95 0.81 3.91 0.05 1.66 1.18 1.99 3.35 0.13 4.24 63.13 0.85 74.54 68.92 TM02-11 泥岩 77.09 10.67 0.34 2.15 0.05 0.82 1.42 2.79 1.65 0.10 2.92 55.02 1.03 60.60 56.15 平均值 64.93 13.93 0.69 5.35 0.09 1.62 1.96 1.68 2.52 0.17 5.99 67.60 0.98 77.23 73.85 PAAS 62.80 18.90 1.00 0.11 2.20 1.30 1.20 3.70 0.16 
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表 2 研究区新田沟组碎屑岩微量元素含量（10−6）
Table 2 Contents of trace elements in clastic rocks of Xintiangou Formation in the study area (10−6)
样品
编号岩性 Sc V Cr Co Ni Cu Zn Ga Rb Sr Zr Nb Cs Pb Th U Ba Hf XG01-1 页岩 18.17 128.34 101.06 29.66 53.27 41.98 98.57 24.60 127.20 89.46 350.62 15.24 9.86 26.81 14.97 3.42 487.62 9.83 XG01-2 页岩 13.51 92.80 74.40 12.77 34.56 27.39 91.19 19.49 88.23 90.36 300.45 14.60 5.14 21.81 13.20 2.83 405.57 8.74 XG01-3 页岩 18.87 137.54 98.28 12.88 47.10 42.72 114.66 25.68 145.81 80.53 332.34 16.18 11.03 27.11 15.26 3.27 554.51 9.92 XG01-4 页岩 19.84 149.67 91.52 7.85 46.71 51.16 98.56 27.65 172.18 79.91 326.04 15.66 12.06 23.26 15.91 4.17 540.64 9.33 XG01-5 泥岩 15.36 97.76 73.19 13.19 37.42 28.76 94.44 21.57 106.99 106.82 332.59 13.86 5.96 24.99 13.96 3.71 604.63 9.34 XG01-6 砂岩 11.16 82.81 56.62 10.74 23.07 10.65 64.24 15.84 45.81 101.33 312.39 13.69 1.77 13.53 12.56 2.70 383.32 9.41 XG01-7 砂岩 6.47 45.99 31.74 9.15 20.30 11.79 53.20 13.63 65.69 165.55 185.76 6.66 1.70 17.84 7.30 1.72 518.89 5.24 XG01-8 泥岩 15.27 103.63 73.25 19.04 41.05 32.63 84.65 22.16 131.82 91.06 405.31 14.50 9.99 18.75 12.91 2.28 585.97 8.56 XG01-9 泥岩 13.22 87.19 81.33 14.50 41.27 31.80 85.09 20.00 105.52 116.69 281.75 13.88 5.06 20.66 12.72 2.60 606.81 8.07 XG01-10 砂岩 10.11 74.62 50.70 11.00 26.70 12.68 55.18 15.95 59.30 97.57 267.36 11.92 2.26 14.65 9.47 2.18 417.82 7.83 XG01-11 砂岩 8.23 60.73 45.41 7.77 21.26 10.52 49.26 14.26 56.48 143.72 251.29 10.86 10.60 14.03 7.42 2.03 539.19 6.78 XG01-12 粉砂岩 16.39 106.86 84.77 17.09 39.25 32.83 92.00 22.07 113.02 146.62 360.00 14.80 6.54 19.40 13.08 4.65 643.74 9.19 XG01-13 砂岩 9.75 65.45 71.20 11.82 19.78 9.47 52.55 15.06 64.88 111.37 311.09 15.10 2.03 15.93 14.76 2.99 574.56 9.56 XG01-14 砂岩 7.59 54.89 37.96 9.01 22.95 15.31 63.16 13.40 61.63 152.49 244.42 8.19 1.59 14.43 9.87 2.17 678.55 7.05 XG01-15 粉砂岩 16.19 136.18 80.07 10.89 39.58 40.78 87.95 21.92 171.66 103.77 228.01 13.23 13.69 20.41 10.90 3.12 686.77 6.51 XG01-16 砂岩 4.99 32.502 21.53 6.07 12.06 101.9 33.39 10.22 58.53 189.00 146.66 5.51 1.38 13.01 4.91 3.47 651.46 4.44 XG01-17 泥岩 14.97 102.44 61.52 10.38 39.17 28.58 92.05 22.08 133.18 101.19 281.27 13.22 7.05 18.57 13.51 2.05 596.81 8.20 TM02-1 砂岩 7.54 48.86 52.37 10.78 33.63 10.98 68.25 12.45 31.25 74.74 207.08 10.61 1.84 17.39 6.29 1.93 295.08 6.21 TM02-2 页岩 20.51 148.94 95.578 28.03 66.49 50.40 130.53 28.44 155.86 97.13 365.99 15.93 10.87 33.11 16.80 3.79 509.98 10.46 TM02-3 粉砂岩 14.19 91.59 77.07 13.73 33.44 26.55 93.32 22.10 87.13 112.48 406.66 15.19 5.37 22.29 13.98 3.98 468.59 11.75 TM02-4 砂岩 9.68 67.19 49.00 11.64 22.13 9.09 63.78 15.31 49.46 147.56 235.07 11.31 1.97 16.44 8.45 1.80 468.22 6.19 TM02-5 泥页岩 18.24 129.09 80.10 11.72 43.92 43.26 105.63 27.15 146.84 101.99 330.92 15.93 9.93 35.49 17.86 3.56 498.19 9.17 TM02-6 粉砂岩 14.15 92.11 78.02 14.01 39.27 27.97 90.66 21.81 107.91 122.27 307.19 13.89 6.43 20.05 12.32 2.49 645.87 9.16 TM02-7 粉砂岩 15.64 99.41 70.94 8.57 36.99 30.67 100.28 20.85 117.13 107.46 294.89 12.17 8.00 24.46 10.54 3.28 710.38 8.36 TM02-8 泥页岩 7.50 52.49 42.42 9.14 22.80 9.02 49.21 13.96 79.44 190.84 184.44 10.53 2.21 16.82 6.05 1.47 676.98 5.30 TM02-9 砂岩 7.59 52.87 39.29 9.19 20.27 9.96 49.12 14.36 33.46 244.14 163.71 9.81 1.54 14.79 6.19 1.28 402.81 4.88 TM02-10 泥岩 13.35 94.05 70.21 13.20 30.77 24.50 71.60 19.72 121.20 164.75 316.80 12.74 7.83 21.09 13.70 3.10 651.89 9.55 TM02-11 泥岩 6.49 71.65 31.95 8.15 17.30 10.11 41.07 11.59 49.31 195.64 139.68 8.74 1.77 14.70 5.42 1.14 470.00 4.08 平均值 12.68 89.56 65.05 12.57 33.30 27.98 77.63 19.04 95.96 125.94 281.06 12.64 5.91 20.07 11.44 2.75 545.53 7.97
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表 3 研究区新田沟组碎屑岩REE含量（10−6）
Table 3 REE contents of clastic rocks in Xintiangou Formation, study area (10−6)
样品
编号岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y XG01-1 页岩 43.07 80.71 8.85 34.53 6.10 1.16 4.97 0.78 4.47 0.96 3.00 0.51 3.47 0.51 23.12 XG01-2 页岩 44.08 80.02 9.82 36.95 6.95 1.36 6.36 0.97 5.30 1.05 3.08 0.48 3.11 0.48 27.76 XG01-3 页岩 45.38 85.39 10.01 41.03 7.39 1.44 6.38 1.02 5.49 1.18 3.46 0.56 3.69 0.56 31.62 XG01-4 页岩 49.09 68.40 11.90 45.03 8.34 1.66 7.47 1.16 6.55 1.30 3.65 0.58 3.71 0.60 35.29 XG01-5 泥岩 50.30 75.27 12.12 47.10 9.20 1.88 8.54 1.29 8.76 1.38 3.83 0.59 3.71 0.57 34.43 XG01-6 砂岩 42.74 81.22 9.47 39.06 6.90 1.28 5.87 0.89 4.76 0.91 2.60 0.40 2.65 0.42 22.15 XG01-7 砂岩 26.06 45.31 5.43 18.11 3.95 0.93 3.70 0.56 3.11 0.62 1.84 0.28 1.74 0.28 17.41 XG01-8 泥岩 42.14 73.76 8.71 35.13 6.56 1.32 5.77 0.91 5.11 1.03 2.93 0.49 3.09 0.48 30.20 XG01-9 泥岩 44.25 77.26 9.80 37.96 7.28 1.54 6.88 1.04 7.15 1.11 3.08 0.47 3.12 0.47 30.67 XG01-10 砂岩 38.43 69.08 7.99 32.60 5.65 1.12 4.92 0.76 3.95 0.81 2.33 0.37 2.33 0.35 20.38 XG01-11 砂岩 32.78 57.64 6.78 27.15 4.69 1.03 3.96 0.63 3.40 0.67 2.02 0.31 2.80 0.32 17.39 XG01-12 粉砂岩 43.16 80.41 9.18 37.19 6.77 1.46 5.94 0.95 5.40 1.05 3.11 0.51 3.31 0.48 30.56 XG01-13 砂岩 53.62 93.96 11.96 42.63 7.37 1.36 6.22 0.97 5.14 1.06 2.97 0.47 2.99 0.45 25.98 XG01-14 砂岩 34.64 61.85 8.04 30.17 5.39 1.12 4.87 0.72 3.84 0.77 2.18 0.33 2.34 0.34 20.98 XG01-15 粉砂岩 28.20 50.66 5.61 22.81 4.11 0.96 4.45 0.66 3.95 0.87 2.62 0.46 2.99 0.48 23.22 XG01-16 砂岩 26.66 45.04 5.70 18.75 4.03 1.09 4.06 0.62 3.41 0.69 1.95 0.30 1.90 0.29 21.17 XG01-17 泥岩 41.24 73.77 8.81 33.41 6.02 1.29 5.53 0.86 4.85 1.02 2.92 0.45 2.93 0.46 26.44 TM02-1 砂岩 30.95 61.84 7.29 30.99 6.26 1.20 5.30 0.81 4.00 0.76 2.07 0.31 2.02 0.31 17.43 TM02-2 页岩 47.80 91.09 11.01 41.35 7.43 1.43 6.47 1.27 5.79 1.21 3.62 0.65 3.98 0.62 34.28 TM02-3 粉砂岩 44.68 84.37 11.00 41.52 7.99 1.56 7.21 1.14 6.37 1.27 3.58 0.58 3.66 0.57 35.93 TM02-4 砂岩 43.96 73.08 9.22 39.18 7.12 1.50 6.62 1.06 5.60 1.10 2.92 0.48 2.66 0.39 34.19 TM02-5 泥页岩 52.59 102.70 11.94 42.56 7.48 1.37 6.13 0.98 5.20 1.08 3.19 0.51 3.62 0.54 25.99 TM02-6 粉砂岩 37.81 72.38 8.16 33.75 6.09 1.33 5.42 0.88 4.94 1.05 3.07 0.49 3.23 0.49 25.93 TM02-7 粉砂岩 37.17 66.71 8.41 35.16 6.78 1.51 6.26 1.01 5.60 1.10 4.90 0.48 3.22 0.49 31.34 TM02-8 泥页岩 32.45 62.04 7.35 31.78 6.26 1.49 5.71 0.88 4.62 0.90 2.36 0.35 2.22 0.34 24.22 TM02-9 砂岩 27.06 50.08 5.89 24.03 4.32 1.02 3.81 0.60 3.23 0.64 1.85 0.28 1.89 0.27 16.16 TM02-10 泥岩 43.34 87.19 9.74 38.72 6.90 1.36 5.93 0.92 5.16 1.05 2.99 0.48 3.13 0.48 25.54 TM02-11 泥岩 19.60 38.68 4.39 18.19 3.49 0.82 3.16 0.49 2.69 0.55 1.51 0.24 1.57 0.24 13.59 平均值 39.33 71.07 8.74 34.17 6.32 1.31 5.64 0.89 4.92 0.97 2.84 0.44 2.90 0.44 25.83 C1球粒陨石 0.237 0.612 0.095 0.467 0.153 0.058 0.2055 0.0374 0.254 0.0566 0.1655 0.0255 0.17 0.0254
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表 4 研究区新田沟组碎屑岩REE北美页岩标准化值
Table 4 Standardized values of REE North American shale in clastic rocks of Xintiangou Formation in the study area
样品编号 岩性 ΣREE LREE HREE LREE/HREE （La/Yb）N δEu δCe XG01-1 页岩 193.09 174.42 18.67 9.34 1.17 0.99 0.98 XG01-2 页岩 200.01 179.18 20.83 8.60 1.34 0.96 0.91 XG01-3 页岩 212.98 190.64 22.34 8.53 1.16 0.98 0.95 XG01-4 页岩 209.44 184.42 25.02 7.37 1.25 0.99 0.67 XG01-5 泥岩 224.54 195.87 28.67 6.83 1.28 1.00 0.72 XG01-6 砂岩 199.17 180.67 18.50 9.77 1.52 0.94 0.96 XG01-7 砂岩 111.92 99.79 12.13 8.23 1.41 1.14 0.90 XG01-8 泥岩 187.43 167.62 19.81 8.46 1.29 1.01 0.91 XG01-9 泥岩 201.41 178.09 23.32 7.64 1.34 1.02 0.88 XG01-10 砂岩 170.69 154.87 15.82 9.79 1.56 1.00 0.93 XG01-11 砂岩 144.18 130.07 14.11 9.22 1.10 1.12 0.91 XG01-12 粉砂岩 198.92 178.17 20.75 8.59 1.23 1.08 0.96 XG01-13 砂岩 231.17 210.90 20.27 10.40 1.69 0.94 0.88 XG01-14 砂岩 156.6 141.21 15.39 9.18 1.40 1.03 0.88 XG01-15 粉砂岩 128.83 112.35 16.48 6.82 0.89 1.05 0.95 XG01-16 砂岩 114.49 101.27 13.22 7.66 1.32 1.26 0.86 XG01-17 泥岩 183.56 164.54 19.02 8.65 1.33 1.049 0.92 TM02-1 砂岩 154.11 138.53 15.58 8.89 1.44 0.98 0.98 TM02-2 页岩 223.72 200.11 23.61 8.48 1.13 0.97 0.94 TM02-3 粉砂岩 215.50 191.12 24.38 7.84 1.15 0.96 0.90 TM02-4 砂岩 194.89 174.06 20.83 8.36 1.56 1.03 0.86 TM02-5 泥页岩 239.89 218.64 21.25 10.29 1.37 0.95 0.97 TM02-6 粉砂岩 179.09 159.52 19.57 8.15 1.10 1.09 0.97 TM02-7 粉砂岩 178.8 155.74 23.06 6.75 1.09 1.09 0.89 TM02-8 泥页岩 158.75 141.37 17.38 8.13 1.38 1.17 0.95 TM02-9 砂岩 124.97 112.40 12.57 8.94 1.35 1.18 0.94 TM02-10 泥岩 207.39 187.25 20.14 9.30 1.31 1.00 1.01 TM02-11 泥岩 95.62 85.17 10.45 8.15 1.18 1.16 0.99 注：δEu=$ \dfrac{{2\omega ({\text{Eu}})}}{{\omega ({\text{Sm}}) + \omega ({\text{Gd}})}} $、δCe=$ \dfrac{{2\omega ({\text{Ce}})}}{{\omega ({\text{La}}) + \omega ({\text{Pr}})}} $，文中下标N表示元素相对球粒陨石标准化值（HasKin et al.，1968），下标S为PAAS标准化值（Taylor et al.，1985）。
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表 5 不同构造背景砂岩的REE特征与研究区新田沟组砂岩对比
Table 5 REE characteristics of sandstones with different tectonic settings and comparison of sandstones in Xintiangou Formation
构造环境 物源类型 REE参数 La Ce ΣREE La/Yb Lan/Ybn ΣLREE/ΣhREE δEu 大洋岛弧 未切割岩浆弧 8±1.7 19±3.7 58±10 4.2±1.3 2.8±0.9 3.8±0.9 1.04±0.11 大陆岛弧 切割岩浆弧 27±4.5 59±8.2 146±20 11±3.6 7.5±2.5 7.7±1.7 0.79±0.13 安第斯型陆缘 隆升基底 37 78 186 12.5 8.5 9.1 0.6 被动陆缘 克拉通内部构造高地 39 85 210 15.9 10.8 8.5 0.56 本文数据 39.4±8.58 71.07±15.49 180.04±38.19 13.76±1.79 9.87±1.28 8.51±0.95 0.66±0.05
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表 6 研究区新田沟组与不同大地构造环境砂岩主量元素（%）对比表
Table 6 Comparison of Major Elements (%) of Sandstone between Xintiangou Formation and Different Tectonic Environments in the Study Area
主量元素及比值（%） 研究区平均值 显生宙不同构造环境下杂砂岩 大洋岛弧 大陆岛弧 安第斯型大陆边缘 被动大陆边缘 SiO2 64.93±6.91 58.83±1.60 70.69±2.60 73.86±4.00 81.95±6.20 Al2O3 14.93±3.12 17.11±1.70 14.04±1.10 12.89±2.10 8.41±2.20 TFe2O3 5.35±1.61 7.47±2.60 4.48±0.90 2.88±1.40 3.08±2.8 MnO 0.09±0.12 0.15 0.10 0.10 0.50 MgO 1.62±0.52 3.65±0.70 1.97±0.50 1.23±0.50 1.39±0.80 Na2O 1.68±0.72 4.10±0.80 3.12±0.40 2.77±0.70 1.07±0.60 K2O 2.52±0.80 1.60±0.60 1.89±0.50 2.90±0.50 1.71±0.60 TiO2 0.70±0.19 1.06±0.20 0.64±0.10 0.46±0.10 10.49±0.20 P2O5 0.17±0.06 1.71±0.60 0.16±0.10 0.09 0.12 TFe2O3+ MgO 6.97±2.04 11.73 6.79 4.63 2.89 SiO2/Al2O3 4.63±1.4 3.45 5.00 5.56 10.00 K2O/Na2O 2.22±2.01 0.39 0.61 0.99 1.60
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表 7 不同构造环境碎屑岩的特征微量元素比值
Table 7 Characteristic trace element ratios of clastic rocks in different tectonic environments
构造环境 Rb/Sr Zr/Hf Zr/Th Sc/Cr 大洋岛弧 0～0.1 45.7 34.6～61.4 0.41～0.73 大陆岛弧 0.32～0.98 36.3 19.1～23.9 0.38～0.26 活动大陆边缘 0.65～1.13 26.3 8.8～10.4 0.28～0.32 被动大陆边缘 0.79～1.59 29.5 13.3～24.9 0.14～0.18 本文数据 0.14～2.15 35.23（平均值） 18.53～33.87 0.14～0.24 注：除本文数据外，其他引自朱志军等2012。
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