Geochemistry, Sr-Nd-Hf Isotopes and Petrogenesis of Mid-Late Triassic Baizhangzi Granitic Intrusive Rocks in Eastern Hebei-Western Liaoning Province
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摘要: 关于冀东-辽西中-晚三叠世具有埃达克质岩石特征的花岗质岩石的源区性质，存在较大争议，且以往对位于其北东向隆起区内的柏杖子岩体的成因研究程度低.对柏杖子花岗质侵入岩进行了系统的年代学、地球化学、Sr-Nd-Hf同位素研究，结果显示：柏杖子岩体结晶年龄为233±3 Ma，岩石具有低MgO、Mg#和Co、Ni、Cr含量；富集大离子亲石元素，亏损高场强元素，显示明显的Pb、Th正异常和Nb、Ta、Ti、P负异常；轻、重稀土元素分馏明显；87Sr/86Sr (t) 为0.704 45~0.705 24，εNd(t) 值为-7.3~-1.7；锆石εHf(t) 为-13.4~-5.9.综合分析认为，高Sr/Y比值和低Y含量的柏杖子岩体属于华北克拉通正常厚度镁铁质下地壳熔融的产物，岩石高Sr/Y比值、低Y含量和Nb-Ta负异常特征为继承的华北克拉通下地壳内在性质，并具有与太古宙-古元古代TTG岩石系列相一致的Nb-Ta解耦特征，表明柏杖子岩体源区物质有TTG岩石的贡献；岩石Sr-Nd-Hf同位素组成和低相容元素含量特征同样表明岩浆来源于受改造的下地壳熔融.早中生代玄武岩底侵过程中幔源组分的加入对华北克拉通下地壳形成改造，同时提供热源诱发下地壳物质熔融，形成的熔体向浅表侵位，经历一定程度的斜长石分离结晶，并最终形成柏杖子岩体.Abstract: The source of the Mid-Late Triassic adakitic rocks remains controversial in the eastern Hebei-western Liaoning Province in recent years, and there is a lack of petrogenesis studies on the Baizhangzi granitic rocks within this NE-striking uplift. Zircon U-Pb and Hf isotope data, whole rock major and trace element and Sr, Nd isotope data are presented for the Baizhangzi graniticintrusive rocks in this paper.Zircon U-Pb datingyields a weighted mean age of 233±3 Ma. The granitic rocks are featured with the high contentof MgO and Mg#, and low content of Cr, Co, Ni. The granitic intrusive rocks are enriched in large-ion lithophile elements, depleted in high-field-strength elements (e.g. Nb, Ta, Ti, P), and display strong positive Pb, Th anomalies and negative Nb, Ta, Ti, P anomalies. Rare earth elements (REE) display right-dipping chondrite-normalized REE patterns, indicating significant fractionation between light REE and heavy REE. The initial 87Sr/86Sr ratios and εNd(t) values vary from 0.704 45 to 0.705 24 and -7.3 to -1.7, respectively. The εHf(t) values of zircons vary from -13.4 to -5.9. It is concluded that the Baizhangzi granitic rocks were derived from partial melting of mafic lower continental crust of the NCC. The high Sr/Y, low Y and negative Nb-Ta anomalies are intrinsic characteristics of the lower continental crust. The Baizhangzi granitic rocks have decoupled Nb-Ta characteristics similar to the Archean-Paleoproterozoic TTG suites, which indicates that the Archean-Paleoproterozoic TTG rocks might have been involved in the magma source. The nonradiogenic Sr, scattered Nd-Hf isotopic compositions and low compatible trace element contents also suggest that the granitic rocks were derived from modified lower continental crust. The mafic lower continental crust has experienced modification by basaltic underplating during the Early Mesozoic, which led to formation of some juvenile crust materials. At the same time, melts produced by melting of the lower continental crust induced by basaltic underplating experienced fractional crystallization of plagioclase to some extent and intruded into the supercrust.
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图 1 大地构造划分图(a) 和柏杖子地区地质简图(b) 和柏杖子地区地质剖面简图(c)
WB.华北克拉通西部地块；EB.华北克拉通东部地块；TNCO.华北中央造山带；图a据Gao et al.(2004)和Zhao et al.(2005)修改
Fig. 1. Tectonic setting (a) and geological sketch map of the Baizhangzi area (b) and profile of the Baizhangzi granitic rocks (c)
图 2 野外露头照片(a) 和镜下显微照片(b)、(c)
Qz.石英；Kp.钾长石；Pl.斜长石；Bt.黑云母
Fig. 2. Outcrop photograph (a) and thin section photomicrograph (b), (c) for Baizhangzi granitic rocks
图 4 柏杖子花岗质侵入岩锆石U-Pb定年谐和图
Fig. 4. Zircon U-Pb concordia diagram of Baizhangzi granitic rocks
图 5 柏杖子花岗质侵入岩Na2O+K2O-SiO2关系(a) 和K2O-SiO2关系(b)
图中浅灰色阴影区域代表水泉沟组范围，深灰色阴影区域代表都山和大石柱子杂岩范围；分类方案采用le Maitre et al.(1989)推荐分类；都山杂岩体数据来源于叶浩等(2014)和吴鸣谦等(2014)；部分大石柱子杂岩体数据来源于叶浩等(2014)；水泉沟组火山岩数据来源于邵济安等(2007)和Ma et al.(2012)
Fig. 5. The Na2O+K2O-SiO2 relations (a) and K2O-SiO2 relations (b) of Baizhangzi granitic rocks
图 6 柏杖子花岗质侵入岩原始地幔标准化微量元素蛛网图(a) 和球粒陨石标准化稀土元素分布模式(b)
原始地幔与球粒陨石标准化值来源于Sun and McDonough (1989)；都山杂岩体数据来源同图 5，图中灰色实线为平均值；水泉沟组火山岩数据(图中灰色区域) 来源于Ma et al.(2012)；华北平均下地壳数据来源于Gao et al.(1998)
Fig. 6. PM-normalized trace element spider diagram and chondrite-normalized REE pattern of Baizhangzi granitic rocks
图 7 柏杖子岩体87Sr/86Sr (t)-εNd(t) 关系(a) 和柏杖子岩体Hf同位素演化(b)
a.水泉沟组火山岩数据来源于Ma et al.(2012)；部分大石柱子岩体数据来源于叶浩等(2014)；基性-超基性岩数据来源于Zhang et al.(2009b)和陈斌等(2008)；早中生代碱性岩数据来源于阎国翰等(2000)和Yang et al.(2012)；早中生代华北下地壳麻粒岩和堆晶岩捕掳体数据来源于邵济安等(2006)和佘宏全等(2006)；与亏损地幔相关岩石数据来源于Wu et al.(2004)和Gao et al.(2004)；亏损地幔(以MORB为代表) 数据来源于Zindler and Jagoutz (1988)；b.都山杂岩数据来源于叶浩等(2014)；中酸性岩浆岩数据来源于王芳等(2009)和Zhang et al.(2009a)；平均地壳176Lu/177Hf=0.015演化区域用于对比
Fig. 7. The 87Sr/86Sr (t) vs. εNd(t) (a) and εHf(t) vs. t (b) of Baizhangzi granitic rocks
图 8 Sr/Y-Y关系(a) 和87Sr/86Sr (t)-SiO2(Rb) 关系
水泉沟组火山岩和都山杂岩数据来源同图 8
Fig. 8. The Sr/Y-Y relations (a) and initial 87Sr/86Sr vs. SiO2 and Rb diagrams
图 9 冀东-辽西地区中-晚三叠世岩浆岩与太古宙-古元古代TTG岩石Nb/Ta比值分布范围
水泉沟组火山岩、都山杂岩和部分大石柱子岩体数据来源同图 8；阜平杂岩中南营花岗质片麻岩数据来源于Liu et al.(2005)；阜平杂岩和五台杂岩数据来源于Liu et al.(2004)；王家会花岗岩数据来源于王月然等(2005)；涑水杂岩数据来源于张瑞英等(2013)；吕梁-五台地区花岗岩、片麻岩、杂岩数据来源于Chen et al.(2006)；滹沱群变质玄武岩数据来源于杜利林等(2009)；灰色实线代表原始地幔Nb/Ta比值17.39(Sun and McDonough, 1989)；浅灰色阴影区域代表柏杖子岩体Nb/Ta比值范围
Fig. 9. Distribution of Nb/Ta ratios of Middle to Late Triassic magma rocks in eastern Hebei-western Liaoning and of Archean-Paleoproterozoic TTG rocks
图 10 柏杖子岩体Nd同位素演化图解(a) 和晚古生代-早中生代岩浆岩Nd同位素演化图解(b)
图a中灰色区域数据来源于Wu et al.(2005)，下部边界演化线(fSm/Nd=-0.35) 为对镁铁质岩石的最小估计；幔源基性-超基性岩数据来源同图 7，水泉沟组火山岩数据和壳源中酸性岩浆岩数据来源同图 8，碱性岩数据来源于阎国翰等(2000)、牟保磊等(2001)、韩宝福等(2004)和Yang et al.(2012)
Fig. 10. The εNd(t)-t relations of Baizhangzi granitic rocks (a) and εNd(t)-t relations of other Late Paleozoic-Early Mesozoic igneous rocks (b)
表 1 柏杖子花岗质侵入岩LA-ICP-MS锆石U-Pb测年数据
Table 1. LA-ICP-MS zircons U-Pb dating data of Baizhangzi granitic rocks
点号 Pba(10-6) Tha(10-6) Ua(10-6) Th/U 同位素比值 年龄(Ma) 207Pb/206Pb 2σ 207Pb/235U 2σ 206Pb/238U 2σ 208Pb/232Th 2σ 207Pb/206Pb 2σ 207Pb/235U 2σ 206Pb/238U 2σ 208Pb/232Th 2σ H120-1-1 430 1 291 1 328 0.97 0.052 95 0.002 84 0.269 10 0.015 05 0.036 83 0.000 76 0.011 49 0.000 42 328 116 242 12 233 5 231 8 H120-1-2 357 1 046 994 1.05 0.050 61 0.003 11 0.249 02 0.015 56 0.035 54 0.000 65 0.011 59 0.000 38 233 145 226 13 225 4 233 8 H120-1-3 542 1 649 1 310 1.26 0.053 23 0.002 87 0.266 43 0.015 05 0.036 22 0.000 67 0.011 32 0.000 37 339 122 240 12 229 4 228 7 H120-1-4 430 1 195 1 226 0.97 0.052 35 0.002 95 0.280 30 0.015 88 0.038 84 0.000 63 0.012 36 0.000 39 302 132 251 13 246 4 248 8 H120-1-5 403 1 213 1 207 1.00 0.049 67 0.002 74 0.252 95 0.014 02 0.036 94 0.000 68 0.011 56 0.000 38 189 123 229 11 234 4 232 8 H120-1-6 475 1 385 1 290 1.07 0.051 10 0.002 90 0.269 32 0.014 72 0.038 29 0.000 68 0.011 62 0.000 40 256 131 242 12 242 4 234 8 H120-1-7 349 1 070 1 111 0.96 0.053 37 0.002 87 0.272 40 0.014 95 0.036 91 0.000 74 0.011 21 0.000 43 346 122 245 12 234 5 225 9 H120-1-8 350 1 022 1 049 0.97 0.051 57 0.003 10 0.269 02 0.015 77 0.037 85 0.000 69 0.011 46 0.000 42 265 137 242 13 240 4 230 8 H120-1-9 484 1 379 1 547 0.89 0.051 53 0.002 78 0.279 17 0.015 99 0.039 16 0.000 77 0.012 11 0.000 40 265 92 250 13 248 5 243 8 H120-1-10 369 1 081 1 272 0.85 0.052 41 0.002 98 0.267 23 0.015 11 0.036 94 0.000 68 0.011 70 0.000 40 302 130 240 12 234 4 235 8 H120-1-11 458 1 307 1 299 1.01 0.051 07 0.002 75 0.270 30 0.014 43 0.038 31 0.000 73 0.011 91 0.000 38 243 121 243 12 242 5 239 8 H120-1-12 377 1 118 1 009 1.11 0.050 45 0.002 88 0.257 46 0.014 44 0.036 96 0.000 58 0.011 41 0.000 37 217 133 233 12 234 4 229 7 H120-1-13 549 1 660 1 811 0.92 0.053 18 0.002 61 0.265 20 0.011 99 0.036 24 0.000 58 0.011 23 0.000 35 345 111 239 10 229 4 226 7 H120-1-14 526 1 434 1 557 0.92 0.050 50 0.002 87 0.279 52 0.015 46 0.040 20 0.000 71 0.012 48 0.000 42 217 131 250 12 254 4 251 8 H120-1-15 287 786 868 0.91 0.049 94 0.003 45 0.255 68 0.017 18 0.037 17 0.000 69 0.012 18 0.000 43 191 156 231 14 235 4 245 9 H120-1-16 636 1 806 2 171 0.83 0.052 33 0.002 24 0.265 25 0.011 13 0.036 68 0.000 52 0.011 85 0.000 35 298 98 239 9 232 3 238 7 H120-1-17 409 1 168 1 362 0.86 0.050 26 0.002 91 0.261 91 0.015 18 0.037 72 0.000 62 0.011 98 0.000 41 206 133 236 12 239 4 241 8 H120-1-18 314 727 746 0.97 0.074 78 0.005 58 0.639 08 0.079 67 0.055 52 0.003 96 0.015 17 0.000 90 1 063 150 502 49 348 24 304 18 H120-1-19 362 1 076 1 161 0.93 0.052 32 0.003 12 0.258 18 0.015 88 0.035 72 0.000 65 0.011 64 0.000 43 298 132 233 13 226 4 234 9 H120-1-20 296 863 826 1.05 0.050 77 0.003 26 0.252 64 0.015 90 0.036 19 0.000V65 0.011 54 0.000 40 232 148 229 13 229 4 232 8 注：上标a代表样品数据与标样GJ-1数据对比计算而来. 
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表 2 柏杖子花岗质侵入岩主量元素(%) 和微量元素(10-6) 含量数据
Table 2. Major elements (%) and trace elements (10-6) contents for Baizhangzi granitic rocks
样品 H120-1 H120-2 K0-1 K0-12 115-4-1 115-4-2 SiO2 66.10 67.03 67.73 67.42 66.80 67.98 Al2O3 15.49 15.19 14.93 15.04 14.63 14.72 Fe2O3 3.09 3.55 2.95 3.27 3.06 3.21 CaO 1.32 1.21 1.42 1.50 1.28 1.23 MgO 0.77 0.73 0.58 0.73 0.59 0.59 Na2O 4.69 4.68 4.79 4.82 4.66 4.69 K2O 5.22 4.97 4.96 5.07 5.01 5.04 TiO2 0.29 0.28 0.26 0.26 0.27 0.26 MnO 0.05 0.04 0.04 0.04 0.05 0.05 P2O5 0.18 0.15 0.14 0.20 0.14 0.14 LOI 2.14 1.50 2.10 1.55 2.20 1.71 Total 99.60 99.55 100.10 100.20 98.90 99.80 Mg# 33.1 28.9 28.0 30.7 27.6 26.7 Li 4.0 6.8 1.5 3.5 1.8 3.2 Be 3.91 4.36 4.70 4.71 4.71 4.81 Sc 9.20 5.44 12.71 9.57 7.65 9.55 V 42.6 42.3 40.3 39.9 40.0 39.4 Cr 15.8 13.1 13.1 13.1 12.8 12.5 Ni 2.9 1.6 1.2 1.0 1.5 0.9 Co 3.66 3.32 2.95 2.89 3.20 3.37 Cu 12.7 21.9 11.7 16.6 12.9 7.4 Zn 18.5 17.1 14.7 13.4 15.3 15.6 Ga 19.4 20.1 19.7 19.4 19.8 19.3 Rb 188 183 183 176 205 211 Sr 610 592 460 481 495 474 Y 12.37 11.56 11.01 12.10 10.98 10.46 Zr 380 387 384 342 333 315 Nb 18.85 19.93 23.28 21.05 23.71 22.56 Cd 0.06 0.06 0.06 0.06 0.05 0.06 Ba 1996 1428 1705 2545 1633 1263 La 119.92 104.95 115.40 121.69 102.55 100.78 Ce 212.48 186.52 197.06 208.49 181.32 183.68 Pr 19.69 17.05 17.72 18.95 16.55 14.83 Nd 62.55 54.00 54.52 58.59 51.36 46.38 Sm 9.68 8.14 8.61 10.17 8.09 7.16 Eu 2.30 1.93 1.98 2.56 1.91 1.66 Gd 6.83 6.25 6.30 6.76 5.98 5.48 Tb 0.77 0.69 0.68 0.72 0.67 0.62 Dy 2.97 2.63 2.61 2.76 2.47 2.35 Ho 0.54 0.49 0.47 0.50 0.46 0.45 Er 1.48 1.31 1.31 1.38 1.26 1.23 Tm 0.21 0.20 0.19 0.19 0.19 0.19 Yb 1.41 1.30 1.27 1.24 1.21 1.19 Lu 0.23 0.22 0.21 0.21 0.20 0.20 Hf 8.40 7.87 7.95 7.38 7.18 7.21 Ta 3.02 2.83 2.81 2.83 2.78 2.83 Pb 45.7 35.6 27.9 22.8 168.2 35.3 Th 13.08 12.33 17.01 12.53 15.39 13.88 U 2.65 2.98 2.54 3.43 3.62 3.60 REE 441.08 385.66 408.34 434.20 374.22 366.21 δEu 0.82 0.80 0.79 0.89 0.80 0.78 (La/Yb)N 60.8 57.9 65.3 70.5 60.5 60.6 (Gd/Yb)N 4.0 4.0 4.1 4.5 4.1 3.8 注：Mg#=100×Mg/(Mg+Fe)，原子个数之比.
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表 3 柏杖子花岗质侵入岩Sr-Nd同位素组成数据
Table 3. Sr-Nd isotopic compositions of Baizhangzi granitic rocks
样品 Sm (10-6) Nd (10-6) 147Sm/144Nd 143Nd/144Nd 2σ εNd(t) tDM(Ma) tDM2(Ma) fSm/Nd Rb (10-6) Sr (10-6) 87Rb/86Sr 87Sr/86Sr 2σ 87Sr/86Sr (t) H120-1 9.68 62.6 0.093 5 0.512 121 3 -7.0 1 305 1 580 -0.52 188 610 0.892 0.707 764 6 0.704 834 H120-2 8.14 54.0 0.091 1 0.512 389 5 -1.7 948 1 149 -0.54 183 592 0.894 0.707 740 6 0.704 801 K0-1 8.61 54.5 0.095 5 0.512 124 6 -7.0 1 324 1 580 -0.51 183 460 1.151 0.708 488 4 0.704 706 K0-12 10.2 58.6 0.105 2 0.512 123 7 -7.3 1 443 1 605 -0.47 176 481 1.059 0.708 722 3 0.705 243 115-4-1 8.09 51.4 0.095 1 0.512 133 6 -6.9 1 308 1 565 -0.52 205 495 1.198 0.708 585 4 0.704 648 115-4-2 7.16 46.4 0.093 3 0.512 122 5 -7.0 1 302 1 578 -0.53 211 474 1.288 0.708 677 3 0.704 445 注：εNd(t) 采用现今CHUR比值143Nd/144Nd=0.512 638和147Sm/144Nd=0.196 6计算( Hamilton et al., 1983 )；tDM和tDM2采用现今亏损地幔比值143Nd/144Nd=0.513 15和147Sm/144Nd=0.213 5计算(Goldstein et al., 1984 ;Peucat et al., 1989 )；147Sm衰变常数采用6.54×10-12 a-1.
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表 4 柏杖子花岗质侵入岩LA-MC-ICP-MS锆石Hf同位素数据
Table 4. LA-MC-ICP-MS in-situ zircons Hf isotopic results of Baizhangzi granitic rocks
样品 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ t(Ma) Hf (0) 2σ Hf (t) 2σ tDM(Ma) H120-1-1 0.028 20 0.000 95 0.001 03 0.000 04 0.282 46 0.000 06 231 -11.6 2.2 -6.7 2.2 1 160 H120-1-2 0.023 54 0.000 46 0.000 87 0.000 01 0.282 44 0.000 07 231 -12.4 2.4 -7.3 2.4 1 182 H120-1-3 0.023 16 0.000 55 0.000 88 0.000 02 0.282 27 0.000 06 231 -18.4 2.1 -13.4 2.1 1 414 H120-1-4 0.028 44 0.001 09 0.001 06 0.000 04 0.282 45 0.000 09 243 -11.8 3.3 -6.6 3.3 1 166 H120-1-5 0.023 82 0.000 79 0.000 88 0.000 03 0.282 46 0.000 05 254 -11.4 1.9 -5.9 2.0 1 146 H120-1-6 0.043 07 0.003 99 0.001 46 0.000 11 0.282 42 0.000 16 231 -12.9 5.5 -8.0 5.5 1 221 H120-1-7 0.025 42 0.000 57 0.000 93 0.000 02 0.282 42 0.000 05 243 -12.8 1.8 -7.5 1.9 1 201 H120-1-8 0.024 59 0.000 51 0.000 90 0.000 02 0.282 41 0.000 05 231 -13.3 2.0 -8.3 2.0 1 219 H120-1-9 0.028 76 0.000 61 0.001 06 0.000 02 0.282 41 0.000 12 243 -13.4 4.3 -8.1 4.4 1 227 H120-1-10 0.028 60 0.001 45 0.001 02 0.000 02 0.282 46 0.000 16 231 -11.5 5.8 -6.5 5.8 1 153 H120-1-11 0.033 06 0.000 79 0.001 20 0.000 03 0.282 42 0.000 07 243 -12.9 2.6 -7.7 2.6 1 213 H120-1-12 0.027 18 0.000 65 0.000 99 0.000 03 0.282 46 0.000 07 231 -11.4 2.4 -6.5 2.4 1 151 H120-1-13 0.027 39 0.000 23 0.001 00 0.000 00 0.282 38 0.000 07 231 -14.4 2.7 -9.4 2.7 1 265 H120-1-14 0.022 87 0.000 62 0.000 84 0.000 02 0.282 32 0.000 07 231 -16.3 2.6 -11.3 2.6 1 333 H120-1-15 0.027 17 0.001 34 0.001 13 0.000 05 0.281 24 0.000 04 231 -54.5 1.4 -49.6 1.5 2 801 注：εHf(t) 采用现今CHUR比值176Hf/177Hf=0.282 785和176Lu/177Hf=0.033 6计算( Bouvier et al., 2008 )；tDM采用现今亏损地幔比值176Hf/177Hf=0.283 294和176Lu/177Hf=0.039 33进行计算；176Lu衰变常数采用1.867×10-11 a-1(Söderlund et al., 2004 ).
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