Discovery and Tectonic Implications of Early Triassic O-Type Adakite in Middle of Great Xing'an Range
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摘要: 为了研究大兴安岭中段地区早三叠世的构造背景问题,以下三叠统哈达陶勒盖组火山岩为研究对象,通过野外观测和X射线荧光光谱分析法、等离子质谱法分别对样品的主量、微量元素进行了测试.结果显示哈达陶勒盖组火山岩是一套中酸性钙碱系列岩石组合,具有高Sr、低Yb与Y和高Sr/Y的特点,为钠质(O型)埃达克岩.结合区域资料认为,古亚洲洋于早三叠世时期闭合的碰撞应力使贺根山-嫩江-黑河构造带活化,推动构造带内年轻地壳由南向北俯冲,进而推动古生代残留洋壳向更深的地幔插入,在此过程中加热并熔融、喷出地表形成哈达陶勒盖组埃达克岩,并在山间盆地沉积了湖相碎屑堆积-老龙头组.Abstract: In order to study the tectonic setting of the Early Triassic of the middle of the Greater Xing'an Range, the volcanic rocks of Lower Triassic Hadataolegai Formation was studied by field observation. Respectively, the main elements and trace elements were analyzed by XRF and ICP-MS. The results show that the volcanic rocks are a series of calcareous series rocks with high Sr, low Yb, Y and high Sr/Y ratios, showing geochemical features of O-type adakites are related to subduction of oceanic slab. we suggests Paleo-Asian Ocean collision along the line of Silumulon River-Changchun-Yanji which activated Hegenshan-Nenjiang-Heihe structural belt in Early Triassic. The collision pushed the young crust to subduct northward along Hegenshan-Nenjiang-Heihe line. The residual Paleozoic oceanic crust are advanced to the deeper mantle melting and then the Hadataolegai Formation adakites were formed. At the same time, the Laolongtou Formation that is lacustrine clastic sediments was deposited in the intermountain basin.
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Key words:
- Early Triassic /
- O-type adakite /
- Hadataolegai Formation /
- middle of Greater Xing'an Range /
- geodynamics /
- petrology
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图 3 大兴安岭中段地区早三叠世哈达陶勒盖组火山岩Nb/Y-Zr/Ti图解
底图据Pearce(1996)
Fig. 3. Nb/Y-Zr/Ti Diagram of volcanic rock from Hadataolegai Formation in Early Triassic in the middle of the Greater Xing'an Mountains
图 4 大兴安岭中段地区哈达陶勒盖组图解
a.AFM图解;b.Th-Hf/3-Ta图解;c.Th-Hf/3-Nb/16图解;d.Th-Zr/117-Nb/16图解;AFM图解据Irvine and Baragar(1971);b、c、d图解据Wood(1980);WPA.板内碱性玄武岩;WPT.板内拉斑玄武岩;IAT.岛弧拉斑玄武岩;E-MORB.富集型洋中脊玄武岩;N-MORB.正常洋中脊玄武岩;IAB.岛弧玄武岩;CAB.钙碱性玄武岩
Fig. 4. Diagrams of rock from Hadataolegai Formation in the middle of the Greater Xing'an Mountains
图 6 大兴安岭中段地区哈达陶勒盖组火山岩图解
a.稀土元素配分模式图,球粒陨石标准化值据Boynton(1984);b.微量元素蛛网图,原始地幔标准化值据Sun and McDonough(1989)
Fig. 6. REE partition pattern graphs
图 7 大兴安岭中段哈达陶勒盖组火山岩图解
a.YbN-(La/Yb)N判别图解,底图据Drummond(1990);b.Y-Sr/Y判别图解,底图据Defant et al.(2002);c.Yb-Sr/Yb判别图解,底图据张旗(2008)
Fig. 7. YbN-(La/Yb)N discrimination diagrams
图 8 大兴安岭中段哈达陶勒盖组火山岩的两类埃达克岩的成分对比图
a.SiO2-MgO成分图解(Wang et al., 2007);b.SiO2-Mg#成分图解(Sheppard et al., 2001)
Fig. 8. Components comparison picture of two kinds of adakites of volcanic rock of volcanic rock in Hadataolegai Fomation in the middle of the Greater Xing'an Mountains
表 1 哈达陶勒盖组的地球化学分析结果(单位:10-6)
Table 1. Geochemical data of Hadataolegai Formation volcanic rocks
样号 B1096-1 B1101-1 B1102-1 B2018-2 B2068-1 B2073-5 B3079-1 B6002-2 岩性 气孔杏仁状安山岩 玄武安山岩 玄武安山岩 绿帘石化英安岩 安山岩 辉石安山岩 辉石安山岩 角闪辉石安山岩 SiO2 60.20 63.10 62.90 64.50 63.0 58.60 56.15 59.90 Al2O3 17.00 16.10 15.75 16.60 15.90 16.20 18.00 15.70 Fe2O3 5.20 2.75 3.04 3.74 3.76 4.54 6.34 3.50 FeO 1.30 1.95 2.05 0.65 1.15 1.65 0.34 2.04 CaO 1.46 3.95 2.67 2.70 3.22 5.42 3.52 3.79 MgO 2.52 2.13 2.04 0.76 2.46 3.60 3.64 2.84 K2O 1.78 3.24 4.22 2.93 4.40 2.94 2.38 3.98 Na2O 6.91 3.96 4.22 5.32 3.35 4.29 6.19 4.98 TiO2 1.05 0.78 0.76 0.56 0.66 0.83 0.98 0.86 P2O5 0.34 0.28 0.28 0.22 0.21 0.29 0.39 0.33 MnO 0.08 0.065 0.076 0.089 0.062 0.100 0.085 0.082 LOI 1.82 1.24 1.46 1.69 1.32 1.14 1.72 1.42 Cu 89.80 24.10 25.60 9.08 67.20 59.30 15.00 42.70 Pb 18.3 16.2 17.4 14.9 23.3 19.8 11.2 26.4 Zn 84.6 75.0 73.7 78.8 66.7 74.6 59.0 67.8 Cr 128.0 61.5 63.9 14.5 49.9 112.0 75.6 92.8 Rb 13.6 61.9 90.5 51.6 91.1 42.7 16.2 48.2 Mo 0.57 0.70 1.29 0.17 0.39 0.42 0.15 0.64 Sr 459 875 1 000 684 916 1 410 1 960 604 Ba 619 1 020 1 260 1 620 946 1 010 1 240 1 460 Nb 4.66 6.51 6.28 6.64 7.19 4.36 2.62 7.90 Ta 0.40 0.43 0.45 0.40 0.49 0.36 0.18 0.56 Zr 168 214 209 238 283 159 112 310 Hf 4.48 5.46 5.41 6.16 7.79 4.32 3.26 8.61 U 1.40 1.37 1.39 1.39 3.74 1.92 0.30 3.84 Th 2.55 4.96 4.80 4.43 16.10 7.10 4.08 14.00 La 25.6 31.9 33.5 26.2 40.2 34.1 38.0 44.6 Ce 60.9 61.3 62.3 55.4 83.3 72.8 71.2 82.4 Pr 7.48 7.61 7.76 6.86 10.10 8.93 12.00 12.80 Nd 30.6 29.5 29.5 27.3 38.0 35.9 50.4 51.0 Sm 5.59 5.06 4.87 4.98 6.22 6.11 8.52 8.63 Eu 1.59 1.49 1.54 1.79 1.46 1.77 2.52 2.20 Gd 4.41 3.96 4.02 4.21 4.73 4.71 5.64 6.08 Tb 0.58 0.54 0.54 0.65 0.68 0.64 0.70 0.82 Dy 2.93 2.32 2.39 3.51 3.04 2.68 2.66 3.62 Ho 0.54 0.44 0.42 0.68 0.57 0.48 0.42 0.64 Er 1.50 1.13 1.09 1.92 1.60 1.38 1.11 1.82 Tm 0.20 0.16 0.15 0.30 0.24 0.19 0.14 0.26 Yb 1.30 0.92 0.99 2.07 1.56 1.18 0.88 1.69 Lu 0.20 0.15 0.16 0.34 0.23 0.19 0.13 0.26 Y 13.6 11.4 11.6 18.4 16.0 12.9 11.4 17.2 Mg# 54.68 50.31 62.49 61.39 64.83 43.15 52.58 55.77 σ 4.39 2.58 3.58 3.17 3.00 3.35 5.59 4.75 A/CNK 1.07 0.94 0.96 0.99 0.99 0.81 0.94 0.81 ∑REE 157.02 157.88 160.83 154.61 207.93 183.96 205.72 234.02 δEu 1.20 0.82 0.98 0.93 1.01 1.06 1.02 1.11 表 2 哈达陶勒盖组火山岩与埃达克岩特征比较
Table 2. Comparison table of characteristics of adakites and volcanic rock from Hadataolegai Formation
埃达克岩特征(值) 哈达陶勒盖组火山岩 岩石组合 安山岩、英安岩、流纹岩 安山岩、英安岩、流纹岩 矿物组合 斜长石+角闪石+黑云母+辉石 斜长石+角闪石+黑云母+辉石 SiO2含量(10-2) ≥56.00 61.04 Al2O3含量(10-2) ≥15.00 16.41 MgO含量(10-2) <3.00(很少超过6.00) 2.50 Mg# ≈50.00 45.08(剔除一件绿帘石化样品后47.91) Na2O与K2O关系 Na2O>K2O Na2O>K2O Na2O含量(10-2) 4.0± 4.9 K2O含量(10-2) 1.00~2.00± 3.23 Sr含量(10-6) >400.0 988.5 Yb含量(10-6) ≤1.90 1.32 Y含量(10-6) ≤18.00 14.06 Sr/Y >20.00~40.00 75.94 La/Yb >20.00 28.14 Zr/Sm >50.00 35.46 高场强元素 Nb、Ta、Zr、Hf、Ti、P亏损 Nb、Ta、Zr、Ti、P亏损,Hf无数据 Eu异常 无异常 1.016 Sr异常 正异常 正异常 注:特征(值)由Gill(1981)、Drummond(1990)和Defant and Drummond(1990). -
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