New Evidence of Indosinian Magmatic Activity and Revelation of Old Ages in Binbalechagan,Inner Mongolia
Field geological survey has revealed that Binbalechagan batholith is not composed of a single rock body.This paper has selected fine grained porphyritic syenogranites (FPSG) in the batholith for the isotope chronological study.By LA-MC-ICPMS U-Pb dating of 28 zircons, weighted mean age of 217.3 ± 9.9 Ma (MSWD =0.076) was obtained from FPSG.Since the characteristics of these zircons are in accordance with those of typical magmatic zircon, the result can represent the diagenetic age of FPSG.The research confirmed the existence of Indosinian magrnatic activities in the area.In addition, 425 ± 5 Ma was obtained from one zircon in which black inclusions were found, and this age is believed to be a mixed one, indicating that there might be an old massif at the age of> 425Ma in the area of Binbalechagan.
Magmatites LA-MC-ICPMS Indosinian movement Dongwuqi Inner Mongolia
YANG Junquan LIU Yongshun CHEN Yinhang
School of Geosciences and Resources,China University of Geosciences (Beijing),P.R.China;Tianjin Inst Tianjin Institute of Geology and Mineral Resources,P.R.China
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
39-44
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）