GEOCHEMISTRY AND FORMATION ENVIRONMENT OF THE LATE TRIASSIC-MIDDLE JURASSIC SILICEOUS ROCKS IN EASTERN HEILONGJIANG PROVINCE
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摘要:
黑龙江省东部那丹哈达增生杂岩主要由晚三叠世-中侏罗世含放射虫硅质岩组成，并夹有镁铁-超镁铁质杂岩和晚古生代浅海沉积岩.对黑龙江省东部石场、勤得利和胜利农场地区硅质岩分析显示，样品Al2O3、TiO2、CaO、Al2O3/（Al2O3+TFe2O3）及ΣREE整体上偏低，具有较高的SiO2含量，为纯硅质岩.结合Al-Fe-Mn三角图和K2O/Na2O值，表明该地区硅质岩的形成过程与海底热液作用无关.元素判别图解及地球化学特征揭示，黑龙江东部三个地区的硅质岩形成于大陆坡及边缘海环境.
Abstract:The Nadanhada accretionary complex in eastern Heilongjiang Province is mainly composed of the Late Triassic-Middle Jurassic radiolarian siliceous rocks intercalated with the mafic-ultramafic complex and Late Paleozoic shallow sea sedimentary rocks. The analysis results of siliceous rocks from Shichang, Qindeli and Shengli Farm areas in eastern Heilongjiang Province show that the samples, characterized by generally low Al2O3, TiO2, CaO and ΣREE contents and low Al2O3/(Al2O3+TFe2O3) ratio and high SiO2 content, are pure siliceous rocks. Combined with the Al-Fe-Mn triangle diagram and K2O/Na2O ratio, it is indicated that the formation of siliceous rocks has nothing to do with seafloor hydrothermal process. The element discrimination diagram and geochemical characteristics reveal the siliceous rocks in the above three areas were formed in continental slope and marginal sea environment.
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表 1 黑龙江省东部硅质岩样品地球化学分析结果
Table 1. Contents of major, trace and rare earth elements in the siliceous rocks in eastern Heilongjiang Province
样品 石场地区黄白色硅质岩 勤得利地区灰黑色硅质岩 胜利农场灰白色硅质岩 胜利农场紫红色硅质岩 Y01 Y02 Y03 Y04 平均值 Y05 Y06 Y07 Y08 平均值 Y09 Y10 Y11 Y12 平均值 Y13 Y14 Y15 Y16 平均值 SiO2 95.24 94.39 94.87 95.95 95.11 95.42 96.08 95.51 96.72 95.93 95.71 96.48 95.52 94.76 95.62 95.08 94.97 94.82 95.77 95.16 Al2O3 2.07 1.76 1.62 1.40 1.71 1.92 1.70 1.91 1.42 1.74 1.66 1.83 2.25 2.17 1.98 1.68 1.72 1.97 1.96 1.83 TFe2O3 0.79 1.62 1.14 0.95 1.13 1.07 0.67 0.72 0.64 0.78 0.84 0.57 0.47 0.61 0.62 0.92 0.94 0.97 0.93 0.94 MgO 0.18 0.14 0.18 0.09 0.15 0.21 0.18 0.24 0.10 0.18 0.12 0.15 0.14 0.16 0.14 0.19 0.20 0.24 0.23 0.22 CaO 0.03 0.02 0.03 0.01 0.02 0.01 0.02 0.01 0.01 0.01 0.03 0.02 0.01 0.01 0.02 0.01 * 0.01 0.01 0.01 Na2O 0.05 0.05 0.04 0.03 0.04 0.05 0.09 0.12 0.28 0.14 0.02 0.02 0.01 0.01 0.02 * 0.01 0.01 0.02 0.01 K2O 0.57 0.44 0.42 0.38 0.45 0.59 0.47 0.56 0.27 0.47 0.37 0.42 0.40 0.42 0.40 0.62 0.62 0.64 0.63 0.63 TiO2 0.07 0.06 0.05 0.05 0.06 0.08 0.06 0.08 0.05 0.07 0.09 0.08 0.10 0.09 0.09 0.07 0.07 0.08 0.08 0.08 P2O5 0.02 0.02 0.02 0.01 0.02 0.01 0.01 0.01 0.01 0.01 0.06 0.02 0.05 0.05 0.05 0.02 0.02 0.03 0.03 0.03 MnO 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.02 0.01 0.01 0.01 0.01 * * 0.01 * * 0.01 0.01 0.01 Total 99.03 98.51 98.39 98.88 98.70 99.37 99.29 99.21 99.52 99.35 98.91 99.61 98.95 98.28 98.94 98.59 98.55 98.78 99.67 98.90 MnO/TiO2 0.14 0.17 0.40 0.20 0.23 0.13 0.17 0.25 0.20 0.19 0.11 0.13 - - 0.12 - - 0.13 0.13 0.13 K2O/Na2O 11.40 8.80 10.50 12.67 10.84 11.80 5.22 4.67 0.96 5.66 18.50 21.00 40.00 42.00 30.38 - 62.00 64.00 31.50 52.50 TFe2O3/TiO2 11.29 27.00 22.80 19.00 20.02 13.38 11.17 9.00 12.80 11.59 9.33 7.13 4.70 6.78 6.99 13.14 13.43 12.13 11.63 12.58 Al/(Al+Fe) 0.72 0.52 0.59 0.60 0.61 0.64 0.72 0.73 0.69 0.70 0.66 0.76 0.83 0.78 0.76 0.65 0.65 0.67 0.68 0.66 La 5.20 5.10 4.30 3.80 4.60 6.50 4.30 8.50 4.20 5.88 9.70 8.90 7.40 7.50 8.38 6.60 6.80 9.70 8.80 7.98 Ce 12.00 12.00 10.10 8.40 10.63 18.60 16.40 21.20 15.60 17.95 14.80 11.40 12.00 11.60 12.45 9.60 10.40 14.60 13.30 11.98 Pr 1.22 1.14 1.01 0.96 1.08 1.34 1.01 2.37 0.96 1.42 2.51 1.94 2.18 2.28 2.23 1.73 1.77 2.74 2.53 2.19 Nd 4.50 4.40 3.80 3.50 4.05 5.00 3.80 9.30 3.40 5.38 10.50 7.40 9.90 10.50 9.58 6.90 7.40 11.80 10.80 9.23 Sm 0.98 1.00 0.82 0.86 0.92 1.14 0.87 1.87 0.67 1.14 2.70 1.59 2.62 2.71 2.41 1.60 1.78 2.81 2.64 2.21 Eu 0.24 0.22 0.14 0.18 0.20 0.24 0.15 0.40 0.16 0.24 0.62 0.30 0.61 0.66 0.55 0.35 0.41 0.62 0.54 0.48 Gd 1.00 0.91 0.75 0.84 0.88 1.01 0.78 1.77 0.60 1.04 2.80 1.54 3.05 3.12 2.63 1.95 1.95 2.72 2.47 2.27 Tb 0.13 0.11 0.10 0.11 0.11 0.14 0.12 0.25 0.08 0.15 0.42 0.24 0.40 0.43 0.37 0.31 0.30 0.35 0.33 0.32 Dy 0.79 0.64 0.62 0.66 0.68 0.80 0.72 1.61 0.50 0.91 2.46 1.59 2.36 2.39 2.20 1.97 1.89 2.02 1.86 1.94 Ho 0.16 0.13 0.12 0.12 0.13 0.16 0.16 0.34 0.10 0.19 0.44 0.33 0.40 0.40 0.39 0.40 0.39 0.38 0.36 0.38 Er 0.45 0.35 0.33 0.32 0.36 0.46 0.46 1.01 0.30 0.56 1.16 1.00 0.99 0.97 1.03 1.01 1.03 1.00 0.95 1.00 Tm 0.06 0.05 0.05 0.05 0.05 0.07 0.07 0.15 0.04 0.08 0.17 0.15 0.13 0.13 0.15 0.12 0.13 0.13 0.12 0.13 Yb 0.39 0.31 0.30 0.30 0.33 0.50 0.43 0.97 0.29 0.55 1.05 0.91 0.75 0.75 0.87 0.67 0.72 0.82 0.75 0.74 Lu 0.06 0.05 0.05 0.05 0.05 0.08 0.07 0.14 0.05 0.09 0.16 0.14 0.11 0.11 0.13 0.09 0.10 0.12 0.11 0.11 U 0.65 0.53 0.59 0.49 0.57 2.05 2.71 2.37 1.93 2.27 1.09 0.71 0.82 0.72 0.84 0.25 0.26 0.28 0.27 0.27 Th 1.25 1.22 1.07 0.84 1.10 1.44 1.03 1.26 0.78 1.13 1.70 1.61 1.78 1.52 1.65 1.44 1.40 1.72 1.67 1.56 U/Th 0.52 0.43 0.55 0.58 0.52 1.42 2.63 1.88 2.47 2.10 0.64 0.44 0.46 0.47 0.50 0.17 0.19 0.16 0.16 0.17 (La/Yb)N 1.29 1.59 1.39 1.23 1.38 1.26 0.97 0.85 1.40 1.12 0.89 0.95 0.96 0.97 0.94 0.95 0.91 1.15 1.14 1.04 (La/Ce)N 1.13 1.11 1.11 1.18 1.13 0.91 0.68 1.05 0.70 0.84 1.71 2.03 1.61 1.69 1.76 1.79 1.70 1.73 1.72 1.74 δCe 1.04 1.08 1.06 0.96 1.04 1.37 1.71 1.03 1.69 1.45 0.65 0.60 0.65 0.61 0.63 0.62 0.65 0.62 0.61 0.63 δEu 1.06 1.01 0.78 0.93 0.95 0.98 0.80 0.97 1.11 0.97 0.99 0.84 0.94 0.99 0.94 0.86 0.96 0.98 0.93 0.93 ΣREE 27.18 26.41 22.49 20.15 24.06 36.04 29.34 49.88 26.95 35.55 49.49 37.43 42.90 43.55 43.34 33.30 35.07 49.81 45.56 40.94 ∑LREE 24.14 23.86 20.17 17.70 21.47 32.82 26.53 43.64 24.99 32.00 40.83 31.53 34.71 35.25 35.58 26.78 28.56 42.27 38.61 34.06 ∑HREE 3.04 2.55 2.32 2.45 2.59 3.22 2.81 6.24 1.96 3.56 8.66 5.90 8.19 8.30 7.76 6.52 6.51 7.54 6.95 6.88 L/H 7.94 9.36 8.69 7.22 8.30 10.19 9.44 6.99 12.75 9.84 4.71 5.34 4.24 4.25 4.64 4.11 4.39 5.61 5.56 4.91 注: Al/(Al+Fe)比值为Al2O3/(Al2O3+TFe2O3)的值, *为检测线以下, 实验测试由澳实分析检测(广州)有限公司完成. 含量单位: 主量元素为%, 微量、稀土元素为10-6. 
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