图  1  秦岭造山带大地构造背景图(a)，东秦岭东段五垛山一带地质简图(b)

图a修改自Dong et al.（2011）. LWF. 灵宝-鲁山-舞阳断裂；LLF. 洛南-栾川断裂；SNF. 商州-南召断裂；SDS. 商丹缝合带；MLS. 勉略缝合带；MBXF. 勉略-巴山-襄广逆冲断裂；TLF. 郯庐断裂

Fig.  1.  Simplified tectonic map of the Qinling orogenic belt showing the tectonic divisions (a), simplified geological map of Wuduoshan area in eastern section of the East Qinling (b)

图  2  东秦岭东段五垛山花岗伟晶岩野外地质特征

a.花岗伟晶岩脉侵入似斑状二长花岗岩；b. 似斑状二长花岗岩；c. 花岗伟晶岩脉侵入黑云石英片岩；d. 花岗伟晶岩

Fig.  2.  Outcrop photos for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  3  东秦岭东段五垛山伟晶岩显微照片

Q.石英；Mc.微斜条纹长石；Olg.奥长石；Kfs.钾长石；Bi.黑云母

Fig.  3.  Microphotographs for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  4  东秦岭东段五垛山花岗伟晶岩锆石的阴极发光（CL）图像及U-Pb年龄（实线圆圈）及锆石Hf分析结果（虚线圆圈）（a）和LA-ICP-MS锆石U-Pb年龄谐图及其锆石²⁰⁶Pb/²³⁸U加权平均年龄图（b~c）

Fig.  4.  Cathodoluminescence photos (CL)of zircons, with marked U-Pb ages and Hf isotopic compositions (a) and LA-ICP-MS zircon U-Pb concordant age diagram, ²⁰⁶Pb/²³⁸U weighted mean ages of zircons (b-c) for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  5  东秦岭东段五垛山花岗伟晶岩锆石球粒陨石标准化稀土元素配分图（标准化值据Boynton，1984）

岩浆锆石和热液锆石区域据Hoskin（2005）

Fig.  5.  REE chondrite-normalized distribution pattern for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling(normalized values after Boynton, 1984)

图  6  东秦岭东段五垛山花岗伟晶岩锆石成因判别图解

图a~b底图据Hoskin（2005）；图c~d底图据Li et al.（2018）.图例同图 5

Fig.  6.  Discriminant diagrams of zircons for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  7  东秦岭东段五垛山花岗伟晶岩锆石ε_Hf(t)-U-Pb年龄

图中数据来源：新生下地壳部分熔融岩浆岩数据据Wang et al., 2009；秦拯纬，2016；Chen et al., 2019；Qin et al., 2020；Yuan et al., 2020；Ren et al., 2021；秦岭岩群部分熔融岩浆岩数据据Wang et al., 2009；王浩，2014；秦拯纬，2016；Qin et al., 2020；Wang et al., 2020；Yuan et al., 2020；Ren et al., 2021；秦岭岩群数据据Shi et al., 2013；Diwu et al., 2014；王浩，2014；杨阳，2017；Yuan et al., 2020；东秦岭伟晶岩数据据Yuan et al., 2018a，2020；Chen et al., 2019

Fig.  7.  Diagram of zircons ε_Hf(t)-U-Pb ages for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  8  东秦岭东段五垛山花岗伟晶岩年龄频谱直方图的区域对比特征

五垛山花岗岩基数据据刘丙祥，2013；赖亚等，2017；易志强等，2017；李开文等，2019；周澍等，2019. 东秦岭造山带伟晶岩数据据刘刚等，2017；Wu et al., 2018；袁峰等，2017；Yuan et al., 2018a，2018b，2020；Chen et al., 2019；Guo et al., 2021；北秦岭构造带岩浆岩数据据Wang et al., 2009；张成立等，2013；王晓霞等，2015；Dong and Santosh, 2016及参考文献

Fig.  8.  Regional contrast features of the age spectra histograms for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling

图  9  东秦岭东段五垛山花岗伟晶岩的T-Δlogf$ {}_{{\mathrm{O}}_{2}} $图

底图据Frost（1991）.图例同图 5

Fig.  9.  Diagram of T-Δlogf$ {}_{{\mathrm{O}}_{2}} $ for granitic pegmatites in the Wuduoshan area in eastern section of the East Qinling