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河南泌阳地区变质花岗岩体的锆石铀-铅年龄及其地质意义 被引量:4

Zircon Uranium-lead Age of Metamorohic Granites from Biyang Area,Henan Province and Its Geological Significance
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摘要 华北克拉通为中国最古老的克拉通,基底形成时经历了多期岩浆-构造热事件,前寒武纪基底上发育有大量的不同时代的花岗岩体。为了厘定分布在华北克拉通南缘的河南泌阳地区的前寒武纪变质花岗岩体的形成年龄,采用高精度的激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)锆石铀-铅(U-Pb)同位素测年方法对其进行精确定年。实验结果表明,变质花岗岩中锆石具有典型的岩浆结晶成因特征,但可能受到后期构造热事件的扰动影响发生同位素的丢失。该变质岩体四个锆石样品的^(206)Pb/^(207)Pb上交点年龄在误差范围内基本一致,给出了2 510~2 556 Ma的年龄,代表了岩体形成年龄。工作表明该地区变质花岗岩形成于新太古代晚期,而不是前人在区调工作中认为的中-新元古代,为华北克拉通南缘的早期岩浆-构造演化研究提供了年代学依据。 North China Craton as a oldest craton in China were experienced intense and widespread magmatismtectonic events. In order to confirm the ages of the Precambrian metamorphic granitoids in the Biyang area of southern margin of the North China Craton,laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)zircon U-Pb method was conducted for dating. The U-Pb dating results suggest that the zircons of granitoid are magmatic zircons with typical magmatic oscillatory zoning,but they also probably were transformed by late tectonic thermal events. The upper intercept age of 206 Pb/207 Pb are supposed to represent the meta-granitoid crystallization age.The ages from 2 510 Ma to 2 556 Ma in Neoarchean were confirmed by zircon isotopic ages of four rock samples,consistently. The precise ages of the meta-granitoid rocks were provided and the basis data also were supplied for the subsequent studies of the early tectonic evolution of southern margin of the North China Craton.
作者 肖本万 XIAO Ben-wan(Third Bureau of Geology and Mineral Resources Investigation and Development Bureau ofGeology and Mineral Resources Exploration Bureau, Xinyang 464000, China)
出处 《科学技术与工程》 北大核心 2019年第12期73-80,共8页 Science Technology and Engineering
基金 中国地质调查局豫西成矿带地质矿产调查项目(1212011220499)资助
关键词 华北克拉通 泌阳地区 LA-ICP-MS 锆石 North China Craton Biyang Area LA-ICP-MS zircon
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