Geochemistry Characteristics of the Late Cretaceous Adakitic Rhyolites of Daxingzhuang Formation and its Genesis in Yixian Area, Western Liaoning Province
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摘要: 辽西义县晚白垩世大兴庄组流纹岩具有埃达克质火山岩的特征.这些流纹岩SiO2≥68.62%、Al2O3≥14.40%、MgO < 1.2%(Mg# < 0.45)、Sr＞360μg/g、Yb < 1.1μg/g、Y < 12μg/g、La/Yb＞40、Sr/Y≥39和Nb/Ta＞17.5;轻稀土元素富集, 重稀土元素和高场强元素(如Nb、Ta、Ti)明显亏损, 轻重稀土元素强烈分馏, 具有弱的负铕异常; Nd、Sr同位素具有较低的143Nd/144Nd(0.511376~0.511441, εNd(t)=-23.45~-22.16)和适中的87Sr/86Sr(0.7073~0.7074, εSr(t)=32.38~32.8)比值, 具有富集地幔端员(EMI)特点.这些特征表明, 大兴庄组流纹质岩浆起源于较厚下地壳榴辉岩部分融熔, 也说明中生代晚期局部仍残留较厚的下地壳, 这为进一步理解燕山造山带中生代到新生代岩石圈减薄提供了重要信息.Abstract: The study of the geochemistry of the Late Cretaceous rhyolites of Daxingzhuang Formation in Yixian area, western Liaoning Province, shows that these rocks demonstrate characteristics of adakitic rocks with SiO2≥68.62%, Al2O3≥14.40%, MgO < 1.2% (Mg# < 0.45), Sr > 360μg/g, Yb < 1.1μg/g, Y < 12μg/g, La/Yb > 40, Sr/Y≥39, Nb/Ta > 17.5 and with δEu weak negative anomaly, LREE enrichment, HREE depletion, HFSEs (Nb, Ta, Ti) strong depletion, lower 143Nd/144Nd ratios (0.511376 to 0.511441, -23.45 to -22.16 in εNd (t)), moderate 87Sr/86Sr ratios (0.7073 to 0.7074, 32.38 to 32.8 in εSr(t)) which have the features of the enriched mantle EMI. The above geochemical features of the rhyolites indicate the magmas originated from the partial melting of eclogite of the lower thicken basaltic crust of the North China craton and perhaps also represent the thicken crust still existed in partial area of Yanshan orogenic belt. It falicitates the understanding of the processes of the lithosphere thinning of the North China craton during the Mesozoic and Cenozoic period.
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图 1 辽西义县大兴庄地区区域地质简图(据1∶5万地质图改编)
1.第四系；2.第三系；3.次火山岩；4.大兴庄组；5.下白垩统九佛堂组；6.下白垩统义县组；7.地层界线；8.角度不整合；9.断层；10采样点及其编号
Fig. 1. Regional geological sketch map modified of Daxingzhuang in Yixian area, western Liaoning Province
图 2 SiO2-(Na2O+K2O)关系图解(Cox et al., 1979)
Fig. 2. SiO2 vs. Na2O+K2O diagram
图 3 大兴庄组流纹岩稀土元素配分曲线模式(a)与微量元素蛛网图(b)(标准值采用Sun and McDonough, 1989推荐值)
Fig. 3. Chondrite-normalized REE distribution patterns (a) and Primary mantle-normalized incompatible element patterns (b) for the Late Cretaceous Daxingzhuang Fm.
图 4 Sr/Y-Y关系图解(Defant and Drummond, 1990)
资料来源：兴隆沟组(Gao et al., 2004; 李伍平，2006)、髫髻山组/辽西蓝旗组(李伍平等, 2001a, 2001b, 2007；李伍平和李献华，2004；袁洪林等，2005)、海房沟组(武广等，2003；李伍平等，未发表资料)、东岭台组(李伍平等，2000；李晓勇等，2004；袁洪林等，2005；李伍平等，未发表资料)
Fig. 4. Sr/Y vs. Y diagram
表 1 大兴庄组流纹岩主量元素(%)、微量元素(μg/g)和Nd、Sr同位素分析结果
Table 1. The analyzed data of major elements (%) by XRF, trace elements (μg/g) by ICP-MS and Nd, Sr isotopies by MC-ICP-MS for the rhyolites of the Late cretaceous Daxingzhuang Formation
样品编号 DX-1 DX-3 DX-5 DX-6 DX-7 DX-9 DX-10 DX-11 SiO2 68.62 69.04 69.02 68.77 69.07 69.45 68.77 68.95 TiO2 0.45 0.46 0.44 0.44 0.46 0.45 0.44 0.46 Al2O3 14.47 14.50 14.46 14.61 14.80 15.07 14.40 14.69 TFe2O3 3.39 3.06 3.35 2.91 3.17 2.70 3.47 3.13 MnO 0.03 0.02 0.05 0.03 0.02 0.03 0.02 0.03 MgO 0.88 0.84 0.70 0.80 0.58 0.55 0.83 1.17 CaO 1.71 1.93 1.87 1.85 1.73 1.60 1.75 1.83 Na2O 4.24 4.37 4.34 4.49 4.46 4.56 4.03 4.04 K2O 4.17 4.02 4.15 4.04 4.08 3.81 4.03 4.17 P2O5 0.22 0.20 0.21 0.20 0.20 0.21 0.19 0.19 H2O+ 1.03 CO2 0.12 烧失量 1.17 0.79 0.69 1.20 0.75 0.91 1.29 1.15 总计 99.35 99.22 99.27 99.33 99.30 99.34 99.23 99.81 Mg# 0.34 0.35 0.29 0.35 0.27 0.29 0.32 0.43 ACNK 0.99 0.96 0.96 0.97 0.99 1.04 1.02 1.01 Na2O/K2O 1.02 1.09 1.05 1.11 1.09 1.20 1.00 0.97 Na2O+K2O 8.40 8.39 8.49 8.54 8.53 8.37 8.07 8.21 Co 5.38 4.19 4.62 5.22 3.90 3.41 3.96 9.80 Ni 10.26 12.13 10.82 11.08 8.23 8.96 10.03 18.00 Ga 19.06 19.06 19.25 19.03 18.90 19.27 19.17 17.70 Ge 1.26 1.22 1.49 1.34 1.30 1.31 1.17 - Rb 101.9 96.2 100.3 96.8 98.1 101.5 93.5 83.1 Sr 478 521 523 516 480 482 473 361 Y 11.77 11.32 11.91 11.24 10.34 11.17 9.48 9.30 Zr 305.1 305.6 306.2 305.8 301.6 319.3 285.6 281.0 Nb 11.38 11.65 11.39 10.77 11.49 12.12 10.95 11.40 Ba 1 980 1 957 1 904 1 927 1 917 1 885 1 790 1 643 La 51.33 51.11 50.44 51.14 49.66 51.61 47.08 39.61 Ce 87.05 90.32 88.10 92.67 88.54 89.15 82.85 75.01 Pr 9.76 9.53 9.78 9.78 9.57 10.03 8.87 8.77 Nd 33.00 33.06 34.75 32.89 32.58 35.20 30.08 27.66 Sm 4.53 4.71 4.63 4.83 4.78 4.79 4.22 4.21 Eu 0.83 0.76 0.84 0.78 0.83 0.93 0.82 0.93 Gd 2.81 2.53 2.66 2.62 2.73 2.85 2.30 2.95 Tb 0.40 0.40 0.42 0.42 0.41 0.40 0.36 0.37 Dy 2.12 2.05 2.18 2.21 2.12 2.20 2.00 1.84 Ho 0.40 0.38 0.42 0.40 0.38 0.42 0.37 0.37 Er 1.06 1.04 1.09 1.11 1.10 1.12 0.99 0.89 Tm 0.15 0.15 0.16 0.16 0.15 0.17 0.14 0.15 Yb 1.01 1.01 1.05 1.04 1.03 1.05 0.94 0.90 Lu 0.14 0.15 0.15 0.16 0.15 0.16 0.14 0.14 Hf 6.11 6.01 6.20 6.39 6.29 6.98 6.11 7.00 Ta 0.51 0.48 0.50 0.52 0.48 0.54 0.62 - Pb 13.50 14.74 13.50 13.78 13.67 15.50 16.42 21.20 Th 4.98 4.75 4.69 4.79 4.99 5.44 5.02 5.20 U 0.90 0.97 0.85 0.95 1.09 0.96 0.91 0.76 REE 194.60 197.20 196.66 200.20 194.04 200.08 181.16 163.80 δEu 0.66 0.60 0.67 0.61 0.64 0.71 0.72 0.76 Sr/Y 40.60 46.00 43.93 45.91 46.41 43.12 49.94 38.82 (La/Yb)N 36.42 36.33 34.59 35.44 34.48 35.19 36.00 31.57 (Ho/Yb)N 1.18 1.14 1.22 1.15 1.09 1.20 1.19 1.23 Nb/Ta 22.18 24.37 22.92 20.71 24.19 22.57 17.66 147Sm/144Nd 0.08 0.08 0.08 143Nd/144Nd±2σ 0.511 577±10 0.511 642±10 0.511 589 61±09 87Rb/86Sr 0.61 0.55 0.60 87Sr/86Sr±2σ 0.707 411±13 0.707 340±14 0.707 373±13 TDM(Ga) 1.83 1.72 1.80 εNd(t) -19.52 -18.23 -19.27 εSr(t) 32.80 32.80 32.38 注: Mg#=Mg/(Mg+Fe)，ACNK=Al2O3/(CaO+Na2O+K2O)；主量和微量分析分别采用X荧光分析和ICP-MS方法分析；Nd、Sr同位素采用MC-ICPMS分析；t=80.83 Ma. 
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