河北地质大学学报2026，Vol.49Issue(4)：70-77,140,9.DOI:10.13937/j.cnki.hbdzdxxb.2026.04.008
内蒙古北山地区白云山一带早泥盆世火山岩地球化学特征及地质意义
Geochemical Characteristics and Geological Significance of the Early Devonian Volcanic Rocks in the Baiyun Mountain Area of the Inner Mongolia Beishan Region
摘要
Abstract
The Hongliuhe-Niujuanzi-Xichangjing serpentinite-greenstone complex is developed in the Baiyun Mountain area of the northern mountainous region of Inner Mongolia,where a set of middle and basic volcanic rocks are developed on its southern side,with rock types including basalt,basaltic andesite,and andesite.The LA-ICP-MS zircon U-Pb age of the basalt is 403.6±2.0 Ma,corresponding to the early Devonian.The main components SiO2 is 49.62％～62.74％;K2O is 0.2％～3.59％;NaO2+K2O is 2.09％～7.45％,and the whole has the characteristics of-calcium alkaline rocks.The total amount of rare earth elements ∑REE is between 57.03×10-6 and 184.06× 10-6,and the obvious fractionation of light and heavy rare earth elements(La/Yb)N is between 3.94～12.61,with a relatively weak negative Eu anomaly(δEu=0.71～1.05).Rb,Th,U,La,Ce,Zr,Hf and other rare earth elements are enriched,and high-field strength elements Ba,Nb,Ta,P,Ti areicient.The average value of Rb/Sr is 0.23,the average value of Nb/Ta is 16.19,the average of Zr/Hf is 37.09;δEu average is 0.88,and it has the characteristics of mixed source of crust andle.Discrimination of volcanic rock construction environment indicates that the volcanic rock suite formed in an island arc environment.Comprehensive geochronological and rock chemical characteristics indicate that study area was in a collision mountain building environment in the Early Devonian.关键词
北山地区/早泥盆世/火山岩/锆石U-Pb定年/地球化学特征Key words
Beishan area/Early Devonian/volcanic rocks/zircon U-Pb dating/geochemical characteristics分类
天文与地球科学引用本文复制引用
杨建坤,赵泽南,魏民,刘思林,高雄..内蒙古北山地区白云山一带早泥盆世火山岩地球化学特征及地质意义[J].河北地质大学学报,2026,49(4):70-77,140,9.基金项目
中国地质调查局项目(DD20160040) （DD20160040）
河北省地质矿产勘查开发局项目(13000022P0069B410029A) （13000022P0069B410029A）
河北省自然资源厅项目(13000023P00F2D410266F) （13000023P00F2D410266F）
河北省地质勘查专项预算资金项目(13000022P00F2D410122R) （13000022P00F2D410122R）
