2006-2010年小秦岭地区中生代花岗岩锆石U-Pb、Lu-Hf同位素及岩石地球化学研究数据集

对小秦岭地区代表性的中生代大型花岗岩基-华山岩体和老牛山岩体进行了主量元素、微量元素、锆石U-Pb年代学及Hf同位素分析测试。在扎实的野外地质勘查基础上，运用高精度LA-ICP-MS定年技术，我们厘定出华山瓮峪以及老牛山康坪角闪二长花岗岩年龄分别为204.7±1.6 Ma和207.9±0.72 Ma，二者均为晚三叠世岩浆作用的产物。在地球化学方面，瓮峪和康坪岩体均具有高硅、富碱、准铝的地球化学特征，铁镁比值较高，富集大离子亲石元素（尤其是Sr和Ba）和轻稀土元素，铕负异常不显著，相对亏损重稀土和钇，可归属为高Ba-Sr花岗岩。此外，研究过程中还对小秦岭地区燕山期方山峪黑云母二长花岗岩进行了一定研究，获得其成岩年龄为131.9±0.8 Ma，尽管该花岗岩具有与印支期花岗岩类似的地球化学特征，但根据区域地质特征、成岩年代学、岩相学以及元素和同位素地球化学综合对比，提出这一类型岩石是先期岩浆系统再造以及地壳物质再循环的产物，在成岩过程中其源区未有石榴子石残留，应属于古特提斯构造域向古太平洋构造域转换背景下板内后造山-裂谷伸展阶段的构造-岩浆事件。

Major and trace element, zircon U-Pb geochronological and Hf isotopic analyses were conducted on two representative large Mesozoic granite batholiths in the Xiaoqinling Mountains: the Huashan batholith and the Laoniushan batholith. Based on rigorous field geological surveys and high-precision LA-ICP-MS dating technology, we constrained the crystallization ages of the amphibole monzogranites from the Wengyu section of Huashan and the Kangping section of Laoniushan to 204.7±1.6 Ma and 207.9±0.72 Ma, respectively, both of which are products of Late Triassic magmatism. In terms of geochemistry, both the Wengyu and Kangping plutons exhibit high silica, alkali-rich, metaluminous characteristics, high Fe/Mg ratios, enrichment in large ion lithophile elements (especially Sr and Ba) and light rare earth elements, insignificant negative Eu anomalies, and relative depletion in heavy rare earth elements and Y, thus belonging to high-Ba-Sr granites. Additionally, the Yanshanian Fangshanyu biotite monzogranite in the Xiaoqinling Mountains was also studied in this research, with its petrogenetic age obtained as 131.9±0.8 Ma. Although this granite shares similar geochemical characteristics with Indosinian granites, through comprehensive comparison based on regional geological features, petrogenetic chronology, petrography, elemental and isotopic geochemistry, we propose that this type of rock is the product of reworking of pre-existing magmatic systems and crustal material recycling, with no garnet residue in its source region during petrogenesis, and should be classified as a tectono-magmatic event during the intraplate post-orogenic-rift extensional stage under the transition from the Paleotethyan tectonic domain to the Paleo-Pacific tectonic domain.