北秦岭地体晚侏罗世-早白垩世蟒岭和牧护关花岗岩体锆石年龄和地球化学组成数据

LA-ICP-MS锆石定年、XRF和ICP-MS方法的全岩地球化学组成、TIMS方法获得的Sr-Nd-Pb同位素组成显示：侵位于北秦岭地体北缘的牧护关和蟒岭两个岩体中的二长花岗岩具有高的SiO2含量（69.3–77.0 wt.%），低Mg#值（0.21–0.38），富集LREE，Th，U和Pb元素，亏损HFSE，且存在Eu的负异常。根据蟒岭岩体二长花岗岩具有较高的Sr/Y、(Dy/Yb)N和(La/Yb)N比值，较低的SiO2含量和不明显的Eu的负异常，所以推测蟒岭岩体二长花岗岩的来源比牧护关岩体二长花岗岩更深。Sr-Nd同位素特征表明，牧护关和蟒岭岩体花岗岩具有相似的岩浆来源，且均来源于不均一的岩浆源区。锆石U-Pb定年结果可以分为两类：（1）岩浆锆石（153-140 Ma）；（2）继承锆石可以分为五个群组，分别为新太古代-古元古代、古元古代-中元古代、新元古代，古生代，晚古生代-早中生代。牧护关和蟒岭岩体花岗岩的地球化学特征显示，它们来源于北秦岭新元古代新生下地壳与古老的基底物质的混合。牧护关和蟒岭岩体较低的放射性成因Pb同位素组成也支持了华北南缘基底物质的参与。数据来源于科研项目“国家重点研发计划“燕山期重大地质事件的深部过程与资源效应”（2016YFC0600404)。

Whole-rock geochemical compositions analyzed by XRF and ICP-MS, LA-ICP-MS zircon dating, and Sr-Nd-Pb isotopic compositions obtained via TIMS show that the monzogranites from the Muhuguan and Mangling plutons emplaced along the northern margin of the North Qinling Terrane have high SiO₂ contents (69.3–77.0 wt.%), low Mg# values (0.21–0.38), enrichment in light rare earth elements (LREE), Th, U and Pb, depletion in high-field-strength elements (HFSE), and display negative Eu anomalies. The monzogranites from the Mangling pluton feature higher Sr/Y, (Dy/Yb)ₙ and (La/Yb)ₙ ratios, lower SiO₂ contents and indistinct negative Eu anomalies, thus it is inferred that the magmatic source of the Mangling pluton’s monzogranites is deeper than that of the Muhuguan pluton’s monzogranites. Sr-Nd isotopic characteristics indicate that the granitoids from both plutons share similar magmatic sources, which are heterogeneous. Zircon U-Pb dating results are divided into two categories: (1) magmatic zircons (153–140 Ma); (2) inherited zircons that can be classified into five groups, i.e., Neoarchean to Paleoproterozoic, Paleoproterozoic to Mesoproterozoic, Neoproterozoic, Paleozoic, and Late Paleozoic to Early Mesozoic. Geochemical features of the granitoids from the Muhuguan and Mangling plutons reveal that they originated from the mixture of Neoproterozoic juvenile lower crust and ancient basement materials of the North Qinling Terrane. The low radiogenic Pb isotopic compositions of the granitoids from both plutons also support the participation of basement materials from the southern margin of the North China Craton. The data are derived from the National Key Research and Development Program of China "Deep Processes and Resource Effects of Major Yanshanian Geological Events" (Grant No. 2016YFC0600404).