摘要
对大别超高压变质带榴辉岩中金红石进行了SHRIMP原位U-Pb定年,得到金红石U-Pb年龄为(219±4)Ma,与前人利用TIMS方法获得的金红石年龄结果在误差范围内是一致的,验证了金红石用于SHRIMP原位U-Pb定年的可行性。通过对比发现,不同赋存状态的金红石U-Pb年龄无明显差别。根据本次测得的年龄数据,结合前人的研究成果,金河桥榴辉岩中金红石的UPb年龄为冷却年龄,代表了大别超高压变质带构造折返阶段的时代。
In-situ SHRIMP U-Pb dating of rutile in eclogite from Dabie ultra-high pressure（UHP）metamorphic belt was studied.The U-Pb age of rutile obtained is（219±4）Ma,consistent with the previous TIMS results of rutiles within the error range.This consistence points to the feasibility of in-situ SHRIMP U-Pb dating of rutile.The dating results indicate no obvious differences for the U-Pb ages of rutiles from different occurrences.Taking together with the previous dating results,it is suggested that the U-Pb age of rutile in Jinheqiao eclogite is the cooling age,representing the tectonic exhumation time of Dabie UHP metamorphic belt.
出处
《地球科学与环境学报》
CAS
2016年第3期334-340,共7页
Journal of Earth Sciences and Environment
基金
国家自然科学基金项目(41173065)
国土资源部公益性行业科研专项经费项目(201311116)
中国地质科学院地质研究所基本科研业务费项目(J1403)
