Magma Evolution of the Late Jurassic Volcanic Rocks and Its Genesis of the Lanqi Formation, Beipiao Area, Western Liaoning Province
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摘要: 辽西北票晚侏罗世蓝旗组火山岩由下段安山质角砾熔岩夹凝灰岩和上段粗安岩组成.通过火山岩的地球化学研究，安山质角砾熔岩具有埃达克质火山岩特征，其中，SiO2含量为56.99%~58.22%，含有较高的Al2O3(＞15.00%)，较高的MgO(≤4.22%，Mg#=0.44~0.49)和较低的K2O(＜2.20%)含量，较高的微量元素，如Sr(＞500.00 μg/g)、Cr(＞125.00 μg/g)和Ni(＞47.00 μg/g)及Sr/Y比值(＞28.00)，和较低的∑REE(＜112.00 μg/g)、U(＜0.30 μg/g)、Th(＜2.00 μg/g)和重稀土(Y＜20.00 μg/g，Yb＜1.60 μg/g)，且轻稀土分馏明显((La/Yb)N=10.49~10.59)，具有明显的Sr正异常和弱的Eu负异常(Eu/Eu*=0.62~0.99)；粗安岩不具有埃达克质火山岩特征，其中，SiO2含量为52.09%~61.08%，含有较高的Al2O3(＞16.60%)和K2O(＞2.00%)，较低的MgO(≤2.64%，Mg#=0.08~0.38)、Cr(＜28.00 μg/g)和Ni(＜19.00 μg/g)及Sr/Y比值(≤23.00)，和较高的∑REE(＞180.00 μg/g)、U(≥0.80 μg/g)、Th(＞4.00 μg/g)和Sr(＞350.00 μg/g)，且轻稀土分馏明显((La/Yb)N=10.22~16.28)，具有明显的Sr和Eu负异常(Eu/Eu*=0.74~0.80).这些火山岩普遍具有Ba、Pb富集和Nb、Ta亏损的特征，Nd、Sr同位素具有中等的εSr(t)(20.15~23.34)，TDM(1.45~1.50 Ga)和低的εNd(t)(-7.69~-8.62)，表明蓝旗组安山质岩浆和粗安质岩浆均起源于下地壳玄武质岩石的部分熔融.其中，安山质岩浆起源较深，位于壳幔过渡带，并发生明显的壳幔相互作用.蓝旗组火山岩由早期的安山质岩浆到晚期的粗安质岩浆演化可能预示着地壳由厚变薄的过程，这对理解华北克拉通中生代岩石圈减薄的深部过程具有重要意义.Abstract: The Late Jurassic volcanic rocks of the Lanqi Formation in the Beipiao area, the western Liaoning Province, are composed of the lower andesitic breccia lava with tuffs and the upper trachyandesite. Based on the study of geochemistry, andesitic breccia lava are from 56.99% to 58.22% in SiO2, high Al2O3 (> 15%), high MgO (≤4.22%, 0.44 to 0.49 in Mg#)and low K2O (< 2.2%) characterizes by high Sr (> 500 μg/g), Cr (> 125 μg/g), Ni (> 47 μg/g) contents and higher Sr/Y ratio (> 28) and low REE (< 112 μg/g), U (< 0.3 μg/g), Th (< 2 μg/g) and HREE (Y < 20 μg/g, Yb < 1.6 μg/g) contents and by strongly fractionated LREE (10.49 to 10.59 in (La/Yb)N) and distinct positive Sr anomalies and negligible negative Eu anomalies (0.62 to 0.99 in Eu/Eu*), which are similar to those of the adakitic rock; and trachyandesite are from 52.09% to 61.08% in SiO2, high Al2O3(> 16.6%) and K2O (> 2%), low MgO (≤2.64%, 0.08 to 0.38 in Mg#) characterizes by high REE (> 180 μg/g), U (≥0.80 μg/g), Th (> 4 μg/g) and Sr (> 350 μg/g) contents, and low Cr (< 28 μg/g), Ni (< 19 μg/g) contents and low Sr/Y ratio (≤23) and by strongly fractionated LREE (10.22 to 16.28 in (La/Yb)N) and distinct negative Eu and Sr anomalies, which differ from those of the adakitic rock. All the volcanic rocks also show positive Pb and Ba anomalies, and negative Nb-Ta anomalies, and have moderate εSr(t) (20.15 to 23.34), TDM (1.45 to 1.50 Ga) and low εNd(t) (-7.69 to -8.62), which are similar to the features of the EMI-like component and of the ancient continental lower crust of the North China craton and the Late Jurassic-Early Cretaceous volcanic rocks in Yanshan orogen belt. In this paper, author thinks that andesitic magmas of Lanqi Formation are derived partial melting of foundered lower continental basaltic crust near the transition between the crust-mantle and occur the interaction of the mantle and crust, and trachyandesitic magmas from partial melting of foundered lower continental basaltic crust. The magma evolution of Lanqi Formation indicates that the process of the crust thinning from the thicken crust, it is an important significance to understand the deep process for the lithospheric thinning of the North China Craton during the Mesozoic era.
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Key words:
- Late Jurassic /
- Lanqi Formation /
- trachyandesite /
- andesitic breccia lava /
- partial melting /
- Beipiao area /
- petrology /
- geochemistry
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图 1 辽西北票地区区域地质(据1∶20万区域地质图改编)
1.第四系/第三系；2.上白垩统孙家湾组/上侏罗统土城子组；3.上侏罗统蓝旗组/中侏罗统后城组；4.下侏罗统北票组/下侏罗统兴隆沟组；5.震旦系；6.火山岩；7.断层/角度不整合接触界线；8.采样位置与样品编号
Fig. 1. Regional geological sketch map of Beipiao area
图 2 北票蓝旗东沟蓝旗组火山岩剖面
Fig. 2. Sectional drawing of volcanic rocks of the Lanqi Formation in Lanqidonggou, Beipiao area
图 4 SiO2与主要氧化物及微量元素哈克图解(图例同图 3)
Fig. 4. SiO2 vs. main oxides and trace elements Hark diagram
图 5 北票蓝旗组火山岩稀土元素配分曲线模式(a)与微量元素蛛网图(b) (图例同图 3，标准化值引自Sun and McDonough, 1989)
Fig. 5. Chondrite-normalized REE distribution patterns (a) and primary mantle-normalized incompatible element patterns (b) for the Late Jurassic Lanqi Formation, Beipiao area
图 6 Sr/Y-Y关系图解(据Defant and Drummond, 1990)
图例同图 3，图中北京、冀北髫髻山组和阜新蓝旗组资料见李伍平等(2001a, 2001b, 2001c, 2007)及李伍平和李献华(2004)
Fig. 6. Sr/Y vs.Y diagram
表 1 北票蓝旗组火山岩主量元素分析结果(%)
Table 1. Chemical compositions of the major elements (%) of the Late Jurassic volcanic rock of Lanqi Formation, Beipiao area
地层 蓝旗组下段 蓝旗组上段 早期 中期 晚期 样号 Lq10 Lq9 Lq8 Lq7 Lq6 Lq5 Lq4 Lq3 Lq2 Lq1 岩性 安山质角砾熔岩 粗安岩 玄武粗安岩 粗安岩 SiO2 58.22 56.99 56.98 57.96 52.68 52.09 52.76 60.99 61.08 58.30 TiO2 0.88 0.89 1.29 1.10 1.74 1.55 1.72 0.77 0.72 1.57 Al2O3 15.34 15.11 16.60 17.52 17.20 18.98 18.08 17.59 16.50 18.37 TFe2O3 8.36 8.85 9.48 8.67 9.52 10.47 9.79 5.10 4.86 6.19 MnO 0.09 0.08 0.07 0.08 0.14 0.08 0.09 0.12 0.09 0.13 MgO 3.33 4.22 1.88 1.16 2.64 0.43 2.35 1.58 1.19 0.73 CaO 5.68 6.35 5.12 4.20 6.89 3.12 6.89 3.20 2.76 4.68 Na2O 3.51 3.35 4.02 5.10 3.85 7.30 3.95 4.32 4.50 4.47 K2O 2.18 1.53 2.62 3.15 2.71 2.09 2.69 4.21 4.18 2.11 P2O5 0.22 0.27 0.51 0.61 0.84 0.69 0.84 0.34 0.33 0.64 LOI 2.27 2.81 1.30 1.02 1.90 2.82 1.51 2.43 2.90 2.52 Total 100.07 100.46 99.86 100.56 100.09 99.63 100.68 100.65 99.10 99.71 Mg# 0.44 0.49 0.28 0.21 0.35 0.08 0.32 0.38 0.33 0.19 ACNK 0.83 0.81 0.88 0.90 0.79 0.95 0.82 1.01 0.97 1.01 K2O/Na2O 0.62 0.46 0.65 0.62 0.70 0.29 0.68 0.97 0.93 0.47 注：1.Mg#=Mg/(Mg+Fe)，ACNK=Al2O3/(CaO+Na2O+K2O)摩尔数；2.主量元素分析采用X荧光分析. 
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