地质通报2024，Vol.43Issue(9)：1620-1635,16.DOI:10.12097/gbc.2023.02.008
新疆伊宁地块坎苏一带LA-ICP-MS锆石U-Pb年龄新资料及其地层归属
New zircon U-Pb age data from LA-ICP-MS and its stratigraphic attribution in the Kansu area of Yining block,Xinjiang
摘要
Abstract
The original Devonian Kansu Formation(metamorphic)volcanic rocks in the Kansu area of Yining block was lack of chronological evidence,with era attribution belonging to the Precambrian Changcheng Period,the Middle-Late Devonian era,or the Late Carboniferous era,leading to confused stratigraphic names and regional correlation.The sequence restoration and proto-rock restoration,elemental geochemical analysis of volcanic rocks and LA-ICP-MS zircon U-Pb dating were carried out,on the basis of 1∶50000 regional geological survey in this area.The results show that the U-Pb ages of the light purplish trachyte and gray white mica-dacite zircons in the original Devonian Kansu Formation(metamorphic)volcanic rocks are 315.6±1.6 Ma and 306.6±1.2 Ma,respectively,and the U-Pb ages of the syenite zircon intrusions into the volcanic rocks are 298.2±1.5 Ma,which defined the geological age of the volcanic rocks as the Late Carboniferous Epoch.Although the volcanic rocks had been subjected to relatively strong granitoid superposition metamorphism and mixing,it still shows the tectonic environment information of continental rift,which is generally comparable to the Late Carboniferous Ishkirik Formation in the region.In view of this,the original Devonian Kansu Formation is newly determined to be the Late Carboniferous Ishkirik Formation,which provides conclusive evidence for the age attribution and regional correlation of volcanic strata.关键词
坎苏组/地质地球化学特征/锆石U-Pb年龄/伊什基里克组/伊宁地块/新疆Key words
Kansu Formation/geological and geochemical characteristics/zircon U-Pb age/Ishkiric Formation/Yining block/Xingjiang分类
天文与地球科学引用本文复制引用
曾令高,郭文杰,朱光辉,韩洪明,胡康强,李斌..新疆伊宁地块坎苏一带LA-ICP-MS锆石U-Pb年龄新资料及其地层归属[J].地质通报,2024,43(9):1620-1635,16.基金项目
中央返还新疆两权价款项目《新疆新源县坎苏一带1:5万K44E004024、K44E005024、K44E006024三幅区域地质调查》(编号:T15-1-LQ12) （编号:T15-1-LQ12）
