Geochemistry of the Zhanbeicun Formation volcanic rocks in Xinlin area of northern Great Xing'an Range and its tectonic environment
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摘要:
大兴安岭北段新林地区下侏罗统战备村组火山岩岩石组合主要为流纹岩、流纹质火山碎屑岩。岩石地球化学研究显示，流纹岩具有高硅、富碱、贫钙镁的特征，属于高钾钙碱性系列。火山岩稀土元素总量较低（ΣREE=81.84×10-6~110.32×10-6），轻、重稀土元素分馏明显，（La/Yb）N值为21.57~40.21，中等负Eu异常，δEu值为0.42~0.62。岩石富集大离子亲石元素Rb、K、Th、U，亏损高场强元素Nb、Ta、P、Ti，基性相容元素Cr、Co、Ni和Mg#值均较低，具有壳源岩浆的特点。流纹岩Sr、Yb值较低，具有喜马拉雅型花岗岩的特征。结合区域早侏罗世火山岩的构造特征，认为战备村组火山岩形成于蒙古-鄂霍茨克洋SE向俯冲的构造环境。
Abstract:The Lower Jurassic volcanic rocks of the Zhanbeicun Formation in Xinlin area of the northern Great Xing'an Range are petrographically composed of rhyolite and rhyolitic pyroclastic rocks.Chemically, these rhyolites belong to high-K calc-alkaline series characterized by high contents of silica, alkalis, low abundances of calcium and magnesium.The volcanic rocks have the characteristics of low ΣREE content(ΣREE=81.84×10-6~110.32×10-6), obvious differentiation between light rare earth and heavy rare earth elements[(La/Yb)N=21.57~40.21], with moderate negative Eu anomaly(δEu=0.42~0.62).These rocks also have characteristics of crust-derived magma with enrichment of large ion lithophile elements(LILEs, such as Rb, K, Th and U), depletion of high field strength elements(HFSEs, such as Nb, Ta, Ti and P)and lower content of basic compatible elements(such as Cr, Co and Ni)and Mg#.The low Sr and Yb content of rhyolites indicates that it is similar to Himalayan type.Combined with tectonic characteristics of the regional Early Jurassic volcanic rocks, it is suggested that the Zhanbeicun Formation volcanic rocks were formed in the tectonic background of the southeastward subduction of the Mongolia-Okhotsk ocean.
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Key words:
- Lower Jurassic /
- Zhanbeicun Formation /
- tectonic setting /
- Great Xing'an Range
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表 1 战备村组火山岩岩石化学测试分析数据
Table 1. Major, trace element and REE of Zhanbeicun Formation volcanic rocks
样品编号 P4T60 P4T74 P4T84 P4T96 P4T32 样品编号 P4T60 P4T74 P4T84 P4T96 P4T32 名称 流纹岩 流纹岩 流纹质晶屑凝灰岩 流纹岩 流纹质晶屑凝灰岩 名称 流纹岩 流纹岩 流纹质晶屑凝灰岩 流纹岩 流纹质晶屑凝灰岩 SiO2 77.49 77.72 77.65 77.73 77.62 Er 0.42 0.49 0.69 0.54 0.48 Al2O3 12.47 12.08 12.32 12.77 12.43 Tm 0.06 0.09 0.11 0.09 0.08 TiO2 0.1 0.1 0.25 0.13 0.19 Yb 0.47 0.59 0.77 0.58 0.69 Fe2O3 0.47 0.25 0.75 0.46 0.45 Lu 0.2 0.27 0.28 0.27 0.27 FeO 0.05 0.12 0.08 0.07 0.08 Li 8.57 18.5 14.42 8.44 16.4 CaO 0.07 0.09 0.08 0.17 0.09 Be 1.17 2.66 2.05 2.88 2.13 MgO 0.1 0.21 0.42 0.38 0.34 Nb 5 11.44 8.7 10.27 9.46 K2O 6.03 6.06 4.52 4.88 5.39 Sc 2.64 2.71 3.94 3.04 3.21 Na2O 2.12 2.37 2.54 1.92 2.27 Ga 14.52 17.43 18.25 17.65 16.45 MnO 0.02 0.02 0.03 0.02 0.02 Zr 72.3 77.7 99.8 104 78.5 P2O5 0.01 0.01 0.03 0.02 0.03 Th 9.14 12.51 10.84 14.13 13.4 灼失量 0.95 0.91 1.25 1.35 0.98 U 3.24 2.88 2.45 3.1 2.63 总计 99.89 99.95 99.91 99.89 99.89 Sr 32.2 33.3 38.9 95.5 35.4 Mg# 30.9 56.03 53.58 62.55 59.95 V 22.3 5.7 36.2 6.4 15.6 TFeO 0.48 0.34 0.76 0.48 0.48 Cr 6.13 5.86 6.96 6.07 6.9 σ 1.93 2.05 1.44 1.33 1.69 Ba 666.2 192 507.6 580.4 346 A/CNK 1.23 1.14 1.34 1.46 1.28 Rb 155.8 154.5 150.9 137.4 144.5 A/NK 1.25 1.16 1.36 1.51 1.3 Pb 6.66 37.23 15.99 32.49 26.63 Y 4.01 4.66 6.38 5.33 4.52 Co 0.21 0.13 0.41 0.08 0.25 La 23.93 26.68 23.2 32.54 25.58 Ni 0.85 0.72 1.24 0.63 0.8 Ce 37.6 42.66 40.36 51.41 41.56 Hf 3.01 3.69 3.66 4.09 3.46 Pr 3.76 4 4.03 5.05 3.9 Ta 0.39 0.78 0.61 0.71 0.57 Nd 11.3 11.21 12.36 14.7 12.01 ΣREE 81.84 90.07 86.92 110.3 99.89 Sm 1.56 1.47 1.71 1.79 1.52 (La/Yb)N 36.88 32.56 21.57 40.21 32.55 Eu 0.27 0.19 0.33 0.31 0.28 (La/Sm)N 8.28 9.92 11.72 8.74 10.46 Gd 1.32 1.38 1.55 1.72 1.35 (Gd/Yb)N 2.34 1.94 1.66 2.45 2.11 Tb 0.15 0.15 0.22 0.19 0.17 δEu 0.59 0.42 0.62 0.55 0.59 Dy 0.69 0.74 1.09 0.96 0.73 Zr/Hf 24.04 21.04 27.25 25.45 27.06 Ho 0.12 0.14 0.22 0.17 0.16 Nb/Ta 12.67 14.71 14.19 14.55 15.31 注：σ=(Na2O+K2O)2/(SiO2-43), TFeO=FeO+0.8998Fe2O3；Mg#=100×n(Mg2+)/[(n(Mg2+)+n(Fe2+)]；主量元素含量单位为%，微量和稀土元素含量单位为10-6 
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