Geological Significance of the Sedimentary Recy-cling Detrital Zircon and Its Recognition:Taking Source Study of Clastic Rocks in the Yang-tze River Basin as an Example
The U-Pb geochronology analysis of detrital zircons is widely used to constrain the deposit age of strata and reconstruct sediment sources and paleogeographic evolution.Combined with the analysis of Lu-Hf-O isotopes,it can further constrain the history of crustal growth and evolution.Sedimentary recycled detrital zircon is widely present in various types of clastic sedimentary rocks due to its high resistance to sur-face processes,which has long been considered to bear a significant impact on the interpretation of detrital zircon data.However,there is currently hardly any efficient way to identify sedimentary recycled detrital zir-con.This study provides a summary of the principles and related geological applications of sedimentary recy-cling and the discrimination methods for recycled detrital zircons,including means such as detrital mineral structure,rock chemical composition,multi-isotope geochronology analysis on zircons,multiple detrital min-eral analysis,and radioactive damage assessment.The advantages and disadvantages of different methods and their applicable conditions have been evaluated.This article presented a case study on zircon provenance in the Yangtze River,using source-normalized radiation α-dose to assess the presence of recycled detrital zir-cons.We emphasize that research based on detrital zircon should integrate regional sedimentary records and magmatic-tectonic history to provide more reliable geological interpretations for detrital zircon data,consider-ing the potential impact of sedimentary recycling on data interpretation.
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