Zircon Geochronology and Petrogenesis of Hedong Highly Fractionated I-Type Granite in Lianshan, Guangdong Province
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摘要: 南岭地区晚中生代花岗岩的岩石成因还存在不同认识.以广东连山地区禾洞高分异花岗岩为研究对象，进行了系统的岩石学、锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素组成研究.锆石LA-ICP-MS U-Pb定年结果表明，禾洞岩体中细粒黑云母正长花岗岩和中粒黑云母二长花岗岩的成岩年龄分别为159.7±1.4 Ma和160.3±1.7 Ma，指示禾洞岩体为晚侏罗世岩浆活动的产物.地球化学分析显示，禾洞岩体高硅和富碱，SiO2含量为70.02%~75.56%，碱含量(K2O+Na2O)变化于7.74%~8.59%之间，贫铁、镁、钙、钛、磷，铝饱和指数(A/CNK值)为0.96~1.28，具有较高的Rb/Sr比值(2.6~17.8)和显著的铕负异常(0.06~0.52).大多数样品的Ga/Al比值小于2.6，高场强元素Zr+Nb+Ce+Y为118×10-6~313×10-6，低于A型花岗岩的下限值，锆石饱和温度也较低(703~801 ℃)，P2O5与SiO2负相关，Y和Th均与Rb呈正相关关系，这些均指示禾洞岩体应为高分异的I型花岗岩.禾洞岩体具较低的ISr值(0.707 00~0.711 39)，较高的εNd(t)值(-7.1~-2.6)，锆石εHf(t)值为-8.4~+2.2.二阶段Nd模式年龄和Hf模式年龄分别为1.30~1.67 Ga和1.04~1.71 Ga.上述同位素数据，结合野外地质特征，表明禾洞岩体在成岩过程中可能发生了壳幔混合作用.在古太平洋板块俯冲形成的伸展构造环境下，禾洞岩体的形成与幔源岩浆沿郴州-临武深大断裂底侵有关.Abstract: The petrogenesis of Late Mesozoic granites in Nanling Mountains region remains controversial. In this paper, it conducts the comprehensive study of petrology, zircon U-Pb chronology, whole-rock element and Sr-Nd-Hf isotopic geochemistry for the Hedong highly fractionated I-type granite in the Lianshan, Guangdong Province. LA-ICP-MS U-Pb zircon analysis yields 206Pb/238U weighted mean ages of 159.7±1.4 Ma and 160.3±1.7 Ma for the medium-fine-grained biotite syenite granite and medium-grained biotite monzonitic granite respectively, indicating that the pluton was formed in the Late Jurassic. Chemical analyses show that the granite has higher SiO2 (70.02%-75.56%) and total alkali (7.74%-8.59%), lower TFeO, MgO, CaO, TiO2, P2O5, A/CNK values is ranging from 0.96 to 1.28. The granite is also characterized by higher Rb/Sr ratio (2.6-17.8) and pronounced negative Eu anomalies (δEu ranging from 0.06 to 0.52). The Ga/Al ratio of most granite samples are lower than 2.6, and the Zr+Nb+Ce+Y values are ranging from 118×10-6 to 313×10-6, which are lower than the respective values of A-type granites. The granite is also characterized by low zircon saturation temperatures (703-801 ℃). The P2O5 contents are negatively correlated with SiO2 while element Y and Th are positively correlated with Rb. Above geochemical data suggest that the rocks from the Hedong pluton are highly fractional I-type granites. They have relatively low ISr values (0.707 00-0.711 39), high εNd(t) values(-7.1 to -2.6)and the εHf(t) values range from -8.4 to +2.2.Their two stage Nd and Hf model ages are 1.30-1.67 Ga and 1.04-1.71 Ga, respectively. Combining with field observation, it suggests that the Hedong pluton was formed by the mixing of crust-derived magmas and mantle-derived magmas. Under the extension environment triggered by subduction of paleo-Pacific plate, the Hedong pluton might form by the underplate of mantle-derived magmas across the Chenzhou-Linwu trans-crustal fault.
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图 1 华南大地构造简图，显示主要的断裂带和构造域(修改自Wang et al., 2013)
ALF.安华-罗城断裂；JSF.江山-绍兴断裂；CBF.慈利-保靖断裂；SMF.松马断裂；CLF.郴州-临武断裂；TLF.郯庐断裂；CNF.长乐-南澳断裂；XGF.襄樊-广济断裂；JNF.江南断裂；ZDF.政和-大浦断裂；QPF.宜丰-景德镇-歙县
Fig. 1. Tectonic map of the South China Block, showing major faults and tectonic domains (revised from Wang et al., 2013)
图 2 南岭中西段花岗岩分布及禾洞岩体位置(修改自高剑峰等, 2005)
A型花岗岩范围据朱金初等(2008)，年龄数据据朱金初等(2008)，Shu et al.(2011)，李剑锋等(2021).SH.锆石SHIRIMPU-Pb年龄，LA.锆石LA-ICP-MSU-Pb年龄. 1. 花山：162±1 Ma(SH)；2. 牛庙：163±4 Ma(SH)；3. 同安：160±4 Ma(SH)；4. 姑婆山：163±4 Ma(LA)；5. 里松：162±3 Ma(LA)；6. 禾洞：145 Ma(估计)；7. 金鸡岭：156±2 Ma(LA)；8. 砂子岭：151±1 Ma(LA)；9. 西山：156±2 Ma(LA)；10. 香花岭：152±2 Ma(LA)；11. 骑田岭：154±1 Ma(LA)；12. 千里山：155±2 Ma(LA)；13.王仙岭：156±3 Ma(LA)；14. 瑶岗仙：152±2 Ma(LA)；15. 大义山：158±1 Ma(LA)；16. 九峰：163±2 Ma(LA)；17. 贵东：164±1 Ma(LA)；18. 佛冈：155±2 Ma(LA)；19. 大东山：158±3 Ma(LA)；20. 连阳：144±1 Ma(LA)
Fig. 2. Distribution map of granite in the western-middle part of Nanling region and showing the location of the Hedong pluton (revised from Gao et al., 2005)
图 3 研究区地质简图及采样位置分布
Fig. 3. Geological sketch of the Hedong pluton and showing the locations of sampling
图 4 禾洞岩体野外和显微镜下典型照片
a. 粗中粒黑云母二长花岗岩；b. 细中粒黑云母正长花岗岩；c. 细粒黑云母正长花岗岩与中粒黑云母正长花岗岩呈渐变接触；d. 中粒角闪石黑云母花岗闪长岩，含暗色微粒包体；e. 粗中粒黑云母二长花岗岩镜下照片，粗中粒花岗结构，长石均有不同程度泥化，黑云母大多绿泥石化(正交偏光)；f. 细中粒黑云母正长花岗岩镜下照片，细中粒花岗结构(正交偏光).矿物缩写：Qz. 石英；Kfs. 钾长石；Pl. 斜长石；Bt. 黑云母
Fig. 4. Representative field photos and micrographs of granitic samples from the Hedong pluton
图 5 禾洞岩体样品中代表性锆石CL图像和锆石U-Pb年龄谐和图
小的实线圈为原位U-Pb定年分析点，大的虚线圈为原位Hf同位素分析点
Fig. 5. CL images and zircon U-Pb concordia age plots of granitic samples from the Hedong pluton
图 6 禾洞岩体A/CNK-A/NK图解和SiO2-K2O图解
A型花岗岩带内花山-姑婆山、金鸡岭、骑田岭、西山岩体数据付建明等(2004, 2006)，顾晟彦等(2006)，朱金初等(2006)，李剑锋等(2021)
Fig. 6. A/CNK-A/NK (a) and SiO2-K2O (b) diagrams for granitic samples from the Hedong pluton
图 7 禾洞岩体的球粒陨石标准化稀土配分模式(a)和微量元素原始地幔标准化蛛网图(b)
球粒陨石和原始地幔标准化值据Sun and McDonough(1989)
Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider gram (b) for the samples from the Hedong pluton
图 8 禾洞岩体成因类型判别图解
a~c底图据Whalen et al.(1987)，图a中A-型花岗岩和分异的I/S-型花岗岩的演化趋势线据Wu et al.(2017)，I、S和A分别代表I型、S型和A型花岗岩，OGT代表未分异的I、S和M型花岗岩区，FG代表分异的I型花岗岩区；d~f底图据Chappell and White(1992)和Li et al.(2007b).A型花岗岩带内花岗岩数据来源同图 6
Fig. 8. Discrimination diagrams of genetic type for granitic samples from the Hedong pluton
图 9 禾洞岩体ISr-εNd(t)(a)和t-εHf(t)(b)图解
南岭中西段A型花岗岩类及碱性玄武岩的Sr-Nd同位素组成据朱金初等(2008)及文内参考文献；里松暗色包体、同安石英二长岩、牛庙辉石闪长岩、花山花岗岩、里松花岗岩Hf同位素数据引自Zhao et al.(2010)，九嶷山金鸡岭数据李剑锋等(2021)，骑田岭仰天湖单元数据刘勇等(2011)，阴影区域的华夏陆块基底Hf同位素演化区域据Xu et al.(2007)和He and Xu(2012)
Fig. 9. ISr-εNd(t) (a) and t-εHf(t) (b) diagrams for granitic samples from the Hedong pluton
图 10 禾洞岩体εHf(t)值和Hf模式年龄(tDM2)箱型图及与南岭北东向A型花岗岩对比
锆石Hf同位素数据出处同图 9b
Fig. 10. The box plot of εHf(t) and Hf model ages(tDM2)for the Hedong pluton and compared with the plot of NE trending A-type granites in Nanling Mountains region
图 11 禾洞岩体高分异I型花岗岩Sr-Ba(a)和La-(La/Yb)N(b)关系图及分离结晶趋势
图a和图b中矿物分离结晶趋势线据Wu et al.(2003).Pl.斜长石；PlAn50.斜长石(An=50)；PlAn10.斜长石(An=10)；Kfs.钾长石；Amp.角闪石；Bi.黑云母；Zr.锆石；Sph.榍石；Ap.磷灰石；Mon.独居石；Allan.褐帘石
Fig. 11. Sr-Ba(a) and La-(La/Yb)N(b)diagrams showing the fractional crystallization trends for the highly fractionated I-type granite from the Hedong pluton
图 12 禾洞岩体(Y+Nb)-Rb图解(底图据Pearce, 1996)
syn-COLG. 同碰撞花岗岩，post-COLG. 后碰撞花岗岩，VAG. 火山弧花岗岩，WPG. 板内花岗岩，ORG. 洋中脊花岗岩
Fig. 12. (Y+Nb)-Rb diagram (Pearce, 1996) for granitic samples from the Hedong pluton.
表 1 禾洞岩体的主量元素(%)和微量元素(10-6)分析结果
Table 1. Major element (%) and trace element (10-6) compositions of granitic samples from the Hedong pluton
样号 13-20 # 13-21 # 13-26 # 13-27 # 13-29 # 13-31 # 13-32 # PM024-17h 主量元素(%) SiO2 75.33 74.72 71.04 70.02 74.48 75.56 74.99 72.62 TiO2 0.10 0.09 0.39 0.47 0.15 0.10 0.10 0.10 Al2O3 11.97 12.15 14.06 14.13 13.45 12.62 12.64 15.77 Fe2O3 0.16 0.02 0.88 0.92 0.44 0.18 0.35 0.68 FeO 1.79 2.02 2.20 2.44 1.18 1.85 1.62 0.65 MnO 0.07 0.07 0.05 0.07 0.07 0.06 0.04 0.05 MgO 0.21 0.34 0.61 0.72 0.19 0.12 0.21 0.18 CaO 0.99 0.90 0.43 1.51 1.06 0.54 0.75 0.69 Na2O 2.90 3.83 3.24 2.74 3.50 3.39 3.23 3.21 K2O 4.84 4.32 5.22 5.26 4.95 4.92 5.36 5.36 P2O5 0.02 0.01 0.13 0.13 0.03 0.04 0.02 0.03 LOI 1.40 1.29 1.41 1.31 0.36 0.31 0.40 0.44 SUM 99.79 99.76 99.66 99.72 99.86 99.70 99.71 99.79 A/CNK 1.01 0.96 1.19 1.09 1.03 1.06 1.01 1.28 ALK 7.74 8.15 8.46 8.00 8.45 8.31 8.59 8.57 AKI 0.84 0.90 0.78 0.72 0.83 0.86 0.88 0.70 D.I. 90.7 91.4 89.3 84.2 91.3 92.7 92.3 90.9 TZr(℃) 763 753 790 762 703 727 767 801 微量元素(10-6) Li 11.1 9.08 17.6 39.3 10.9 16.2 5.75 6.52 Be 6.27 10.9 5.35 4.29 1.81 4.02 3.31 4.82 Sc 2.37 2.82 6.05 6.88 1.60 1.26 1.95 2.06 V 2.50 1.54 24.8 35.1 3.16 2.58 2.11 2.03 Cr 3.32 2.82 7.52 8.40 1.08 3.62 2.41 0.50 Co 1.26 0.86 3.57 4.61 0.87 1.01 0.74 0.40 Ni 1.70 1.48 4.15 5.00 0.63 1.78 1.45 0.30 Cu 6.65 9.95 7.90 9.52 1.28 2.79 3.06 1.23 Zn 65.7 21.6 40.4 55.0 28.5 28.7 17.9 22.2 Ga 18.1 19.6 17.6 17.9 14.6 17.2 14.5 15.9 Rb 462 438 337 308 115 257 232 242 Sr 25.9 27.2 89.4 119 128 27.1 50.9 55.8 Y 55.1 75.7 31.1 38.3 9.30 22.9 19.2 28.0 Nb 52.0 75.9 27.9 30.0 7.61 28.5 13.8 18.7 Cs 9.18 6.60 10.2 11.2 3.58 5.48 4.87 7.51 Ba 129 84.8 538 774 506 77.5 319 315 La 34.6 28.9 31.4 46.1 26.5 17.7 44.0 54.7 Ce 63.4 55.5 79.8 76.5 45.5 36.6 90.1 113 Pr 7.25 6.39 7.07 9.42 4.56 4.09 8.19 11.5 Nd 24.6 20.7 24.1 38.8 16.1 16.2 31.3 39.6 Sm 5.64 5.62 4.89 7.76 2.37 3.79 5.33 6.92 Eu 0.16 0.11 0.62 1.19 1.07 0.28 0.69 0.74 Gd 5.19 5.48 4.31 6.35 2.16 3.30 4.46 4.95 Tb 1.22 1.35 0.85 1.20 0.32 0.71 0.71 0.75 Dy 8.48 11.8 5.34 7.15 1.49 4.80 3.41 4.31 Ho 1.69 2.50 1.06 1.32 0.29 0.91 0.64 0.82 Er 5.29 8.37 3.23 3.88 0.98 2.62 2.07 2.57 微量元素(10-6) Tm 1.05 1.58 0.56 0.66 0.17 0.48 0.37 0.44 Yb 6.73 10.8 3.41 4.26 1.14 3.24 2.62 3.18 Lu 0.95 1.56 0.50 0.59 0.18 0.47 0.38 0.51 Ta 6.45 11.5 2.49 2.63 0.54 2.81 2.37 3.12 Tl 2.73 2.59 2.16 1.44 0.50 1.25 1.06 1.08 Pb 225 36.7 32.3 30.6 22.3 34.7 30.6 32.4 Th 48.4 54.3 34.3 39.1 11.0 48.5 20.1 23.4 U 11.2 22.0 8.01 8.95 3.06 12.1 5.63 4.40 Zr 119 114 146 118 55.7 72.7 127 153 Hf 5.50 6.49 4.58 4.12 2.14 3.77 4.45 4.56 ΣREE 166.2 160.7 167.1 205.2 102.8 95.2 194.3 244.3 LREE 135.6 117.2 147.9 179.8 96.1 78.7 179.6 226.8 HREE 30.6 43.4 19.3 25.4 6.73 16.5 14.7 17.5 LREE/HREE 4.4 2.7 7.7 7.1 14.3 4.8 12.2 12.9 (La/Yb)N 3.7 1.9 6.6 7.8 16.7 3.9 12.0 12.3 (La/Sm)N 4.0 3.3 4.1 3.8 7.2 3.0 5.3 5.1 (Gd/Yb)N 0.6 0.4 1.0 1.2 1.6 0.8 1.4 1.3 δEu 0.1 0.1 0.4 0.5 1.4 0.2 0.4 0.4 δCe 1.0 1.0 1.3 0.9 1.0 1.1 1.2 1.1 Rb/Sr 17.8 16.1 3.8 2.6 0.9 9.5 4.6 4.3 K/Rb 86.9 81.8 128.5 141.7 357.2 158.9 191.7 184.0 Zr/Hf 21.6 17.6 31.9 28.6 26.0 19.3 28.5 33.5 Nb/Ta 8.1 6.6 11.2 11.4 14.0 10.1 5.8 6.0 注：全碱ALK=Na2O+K2O；过碱指数AKI= (Na2O+K2O) /Al2O3(分子比)；铝饱和指数A/CNK=Al2O3/(Na2O+K2O+CaO)(分子比)；D.I.分异指数，锆石饱和温度TZr据Watson and Harrison(1983)方法计算. 
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表 2 禾洞岩体的Sr-Nd同位素组成和相关参数
Table 2. Sr-Nd isotopic compositions and parameters of granitic samples from the Hedong pluton
样品号 13-21 # 13-27 # 13-29 # 13-32 # PM024-17h Rb (10-6) 438 308 115 232 243 Sr (10-6) 27.2 119.0 128.0 50.9 55.0 87Rb/86Sr 47.09 7.50 2.60 13.22 12.83 87Sr/86Sr 0.818 71 0.728 46 0.714 87 0.737 08 0.736 61 (87Sr/86Sr)t 0.711 60 0.711 39 0.708 95 0.707 00 0.707 42 Sm (10-6) 5.62 7.76 2.37 5.33 6.87 Nd (10-6) 20.7 38.8 16.1 31.3 42.2 147Sm/144Nd 0.165 2 0.121 7 0.089 6 0.103 6 0.099 1 143Nd/144Nd 0.512 30 0.512 07 0.512 23 0.512 25 0.512 26 εNd(t) -2.6 -7.1 -4.0 -3.6 -3.4 TDM2(Ga) 1.43 1.67 1.34 1.32 1.30 f (%) 66 47 60 62 63 注：f为参照 DePaolo et al.(1991) 的方法计算的壳幔二端元混合体系中幔源组分所占比例.计算公式为：f=(Ndc/Ndm)/[(Ndc/Ndm)+(εm-εs)/(εs-εc)]，Ndc、Ndm分别代表地壳和地幔端元Nd的丰度，计算时取Ndc=25×10-6，Ndm=15×10-6，εc=-15，εm=+8.
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