大陆地壳的形成与再造演化是地球科学一个重要的基础问题和持续研究的内容。近十几年来全球碎屑锆石U-Pb年龄和Hf-O同位素研究为区域和全球大陆地壳的形成和再造演化提供了重要的记录。碎屑锆石提供了沉积物源区的酸性岩浆岩及其再循环产物的记录，但难以记录变质作用和流体蚀变等地壳再造过程。独居石是LREE磷酸盐矿物，富集Th和U，广泛形成于过铝质花岗岩、伟晶岩和中-高级变质岩，非常适合于同位素地质年代学和地球化学研究。独居石是沉积岩的一种主要碎屑富矿物，对流体蚀变敏感，对地壳变质作用和流体活动的再造示踪有重要作用。本项目拟在研发SIMS独居石微区氧同位素分析方法和标样的基础上，对华夏陆块显生宙沉积岩/沉积物的碎屑独居石进行系统微区原位定年和Nd-O同位素分析，为深入研究华夏是否存在太古代陆壳基底以及印支期造山运动属性等地壳形成和再造演化问题提供进一步的制约。

The mechanisms by which the continental crust grow and rework are one of fundamental questions in the Earth sciences. Large datasets from single zircon U-Pb age and Hf-O isotopes have been increasingly acquired during the past decade due to great advances of in situ microanalytical techniques. While Hf-O isotopes of detrital zircons from sedimentary rocks are widely used in the study of felsic magmatism linking the crustal growth and recycling to the U-Pb crystallization age of the mineral, they seem difficult to reveal metamorphic evolution and fluid alteration characterized by a broad range of temperatures during crustal reworking. Monazite, a LREE phosphate mineral, is commonly formed in peraluminous granitoids, pegmatites and medium- to high- grade metamorphic rocks. It is high in Th and U, thus, can be precisely dated by the U-Th-Pb system. Monazite is also a common detrital mineral in clastic sedimentary rocks. It is more likely to be affected by metamorphism and alteration by fluids than zircon, providing an alternative approach to study crustal rewiring processes at relatively low temperatures. In this project, we will firstly develop SIMS monazite O-isotope analytical techniques and standards. We will carry out integrated in situ analyses of U-Th-Pb age and Nd-O isotopes for detrital zircons from Phanerozoic sedimentary rocks/sediments from the Cathaysia Block, enable new constraints to be placed on the growth and reworking of the continental crust. Our work has significant implications for better understanding (1) whether there exist the Archean basement rocks beneath the Cathsysia Block, and (2) the mechanism of the Indosinian-aged orogenesis in SE China.