*** Dataset of Element Compositions and Mean Zircon Hafnium Isotopes of Igneous Rocks underlying the research: A test of the hypothesis that syn-collisional felsic magmatism contributes to continental crustal growth ***
Authors: X., Lin, D., Cicchella, J., Hong, G., Meng
School of Earth Sciences and Resources, Chang'an University
Department of Science and Technology, University of Sannio
Xi'an Center of Geological Survey, China Geological Survey
The Second Mining District, Jinchuan Group Co., LTD.

Corresponding author: X., Lin
Contact Information: xinlin@chd.edu.cn; xlin1@laurentian.ca
Chang'an University - School of Earth Sciences and Resources
710054, Xi'an, Shaanxi Province, People's Republic of China

***General Introduction***
The dataset contains the ages, thirty-five element compositions, and mean zircon εHf(t) compositions of igneous rocks. The data is extracted from the database GEOROC and Tibetan Magmatism Database. It is being made public both to act as supplementary data for publications of Xin Lin (title: A test of the hypothesis that syn-collisional felsic magmatism contributes to continental crustal growth via deep learning modeling and principal component analysis of big geochemical datasets.) and in order for other researchers to use this data in their own work. In addition to direct utilization of raw data, advanced data science such as supervised/unsupervised machine learning algorithms can be applied to extract implicit geologic information.
The lithology in the dataset includes andesitic, anorthositic, basaltic, dacitic, dioritic, gabbroic, granitic, monzonitic, rhyolitic, and ultramafic rocks. The proportion of acidic, intermediate, mafic, and ultramafic rocks are 55%, 35%, 9%, and 1%, respectively. The data are temporally concentrated in Jurassic and early Cretaceous (n = 384), then in Precambrian (n = 344), late Cretaceous (n = 330), Trassic (n = 235), Cenozoic (n = 230), Permian (n = 206), Carboniferous (n = 152), and Silurian and Ordovician (n = 133). The elements include . The sample ages span from Proterozoic to Cenozoic, and the mean zircon εHf(t) values range from −30 to 30.

***Purpose of the data collection***
The dataset is anticipated to help generate and test hypotheses particularly about the evolution of Earth's crust using element and isotope geochemistry.

***Description of the data in this data set***
The data included in this dataset has been organised per sample.
                       First column = citation
                  Second column = sample name
                     Third column = Latitude
                   Fourth column = Longitude
Fifth ~ Thirty-ninth column = Element concentrations (SiO2, TiO2, Al2O3, MnO, MgO, CaO, Na2O, K2O, P2O5, V, Ni, Rb, Sr, Y, Zr, Nb, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, Th, and U)
                  Fortieth column = ratio of Hf176 and Hf177 
               Forty-first column = ratio of Lu176 and Hf177
          Forty-second column = age of igneous rocks
              Forty-third column = εHf(t) values