内蒙古北山哈珠地区晚古生代花岗岩类年代学与地球化学测试数据集

Geochronological and Geochemical Dataset of Late Paleozoic Granitoids in the Hazhu Area of Beishan,Inner Mongolia

本数据集依托中国地质调查局"内蒙古1:50000哈珠幅、哈珠东山幅、哈珠南山幅和砾石滩幅区域地质矿产调查"项目,在详细开展野外地质调查的基础上,进行岩石分析测试整理而成。本文汇集了内蒙古北山哈珠地区晚古生代花岗岩类样品的测试数据,岩石类型包括英云闪长岩、花岗闪长岩、二长花岗岩和碱性长石花岗岩。锆石年代学数据显示该类岩石的形成时代为石炭纪–二叠纪,岩石全岩常量和微量元素数据表明石炭纪花岗岩类为准铝质–弱过铝质、中钾钙碱性系列岩石;稀土元素配分曲线呈现右倾分布特征;微量元素富集大离子亲石元素Rb、Ba、K等,亏损Nb、Ta、Ti等高场强元素,反映了岩浆形成于与俯冲带有关的陆缘弧环境。而二叠纪花岗岩类则表现为高硅、富碱、准铝、贫镁的特征,为中钾–高钾钙碱性系列岩石;该类岩石同样表现为富集大离子亲石元素,亏损高场强元素,但碱性长石花岗岩内发育文象结构,且花岗闪长岩内发育大规模水晶晶洞,指示二叠纪岩体就位于伸展环境。两者相结合可以为研究北山地区红石山–百合山洋的俯冲极性及构造演化提供依据与基础数据支持。本数据集为Excel表格型数据,包括2个.xls类型文件(Geochemistry dataHZ.xls,Zircon U–Pb datingdataHZ.xls),分别记录了27件样品的地球化学数据与11件样品的锆石U–Pb测年数据。本数据集测试样品均在中国地质调查局天津地质调查中心实验室完成,数据质量可靠。

Under the project of’1:5000 Regional Geological and Mineral Survey of the Hazhu,Hazhudongshan,Hazhunanshan and Lishitan Map-sheet’by China Geological Survey,this dataset was compiled though rock analysis and tests based on detailed geological field surveys.This paper presents the test data of Late Paleozoic granite samples in the Hazhu area in Beishan,Inner Mongolia.The rock types include tonalite,granodiorite,monzonitic granite and alkaline feldspar granite.Zircon chronological data show that the formative era of these kind of rocks are Carboniferous–Permian.The whole-rock macroelement and trace element data show that Carboniferous granitoids are of the metaluminous-weak peraluminous and medium-K calc-alkaline series.The distribution curve of rare earth elements displays rightleaning characteristics.Trace elements are rich in large-ion lithophile elements including Rb,Ba and K;and deficient in high field-strength elements including Nb,Ta and Ti;thus,indicating that magma was formed in a continental marginal arc environment related to the subduction belt.In contrast,Permian granitoids display high-silicon,alkali-rich,metaluminous and magnesium-deficient features,and constitute a medium-high-K calc-alkaline series.They are also rich in large-ion lithophile elements and deficient in high-field strength elements.However,graphic texture is developed within alkaline feldspar granite and crystal caves are developed on a large scale in granodiorite,indicating that the Permian rock mass is situated in an extensional environment.The combination of the two can provide a basis and fundamental data support for studying the subduction polarity and tectonic evolution of the Hongshishan–Baiheshan Ocean in the Beishan area.This dataset is presented in the form of Excel tables,including two.xls files(Geochemistry data_HZ.Xls and Zircon U–Pb dating data_HZ.xls),which record the 27 samples’geochemical data and 11 samples’zircon U–Pb dating results of the samples,respectively.The samples of this dataset were all tested at the Tianjin Center laboratory of China Geological Survey,with reliable data quality.