The project, as target on lower crust granulite xenoliths entrained in Phanerozoic basaltic rocks occurred in the typical regions of the North China Craton as well as Archean granulites exposed in the Precambrian terrane and utilizing the recently-imported sophisticated Femtosceond laser analytical technique in the Northwest University, is designed to probe the Pb isotopic composition and its temperal-spatial distribution of the lower crust beneath the North China Craton, the processes involved in the destruction and modification of the ancient lower crust of the North China Craton and its mechanism, as well as the nature and origin of the underplated melts involved in modification, through the systematic in-situ Pb isotopic analyses on the plagioclases of these lower crust granulite xenoliths and Archean granulites from the Precambrian terrane, in combination with detailed studies on granulite petrology and geochemistry such as U-Pb dating,oxygen and Hf isotopes of zircons from these garnulies. This project finally tries to provide the Pb isotopic constraints on the destruction and modification processes of the ancient lower crust of the North China Craton from a new view of plagioclase Pb isotopes.
本项目以华北克拉通典型地区显生宙玄武质岩石携带的下地壳麻粒岩捕虏体和前寒武纪地体麻粒岩为研究对象,采用西北大学最新引进的飞秒激光原位分析技术,通过对这些下地壳麻粒岩捕虏体和前寒武纪地体麻粒岩中斜长石的原位Pb同位素系统分析,并结合详细的岩石学和麻粒岩中锆石的U-Pb定年以及相应的锆石氧同位素和Hf同位素地球化学研究,来探讨华北下地壳的Pb同位素组成、时空分布和演化规律,古老下地壳的破坏和改造过程及其机理、以及参与改造的底侵熔体的性质和来源。从而为我国华北岩石圈下地壳的破坏和改造过程提供Pb同位素地球化学约束。
本项目以华北克拉通典型地区显生宙玄武质岩石携带的下地壳麻粒岩捕虏体和前寒武纪地体麻粒岩为研究对象,采用西北大学最新引进的飞秒激光原位分析技术,通过对这些下地壳麻粒岩捕虏体和前寒武纪地体麻粒岩中斜长石的原位Pb同位素系统分析,并结合详细的岩石学和麻粒岩中锆石的U-Pb定年以及相应的锆石氧同位素和Hf同位素地球化学研究,来探讨华北下地壳的Pb同位素组成、时空分布和演化规律,古老下地壳的破坏和改造过程及其机理、以及参与改造的底侵熔体的性质和来源。从而为我国华北岩石圈下地壳的破坏和改造过程提供Pb同位素地球化学约束。
{{i.achievement_title}}
数据更新时间:2023-05-31
基于腔内级联变频的0.63μm波段多波长激光器
岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制
石萆汤对弱精子症患者精子线粒体膜蛋白PHB及超微结构的影响
激光入射角对振镜扫描激光刻蚀质量的影响
沙尘信道下激光通信系统的性能分析
华北下地壳麻粒岩超显微构造研究
华北下地壳麻粒岩流变学实验研究
华北克拉通麻粒岩和橄榄岩的地震波性质和导电率
大陆下地壳麻粒岩高温流变实验研究