华南地质2024，Vol.40Issue(1)：1-27,27.DOI:10.3969/j.issn.2097-0013.2024.01.001
沉积再循环碎屑锆石的地质意义及其识别
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
摘要
Abstract
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.关键词
碎屑锆石/沉积再循环/岩浆构造历史/物源/长江流域Key words
detrital zircon/sedimentary recycling/magmatic-tectonic history/material sources/Yangtze riv-er basin分类
地质学引用本文复制引用
宋仁龙,秦拯纬,周光颜,鲍波..沉积再循环碎屑锆石的地质意义及其识别[J].华南地质,2024,40(1):1-27,27.基金项目
中国地质调查局地质调查项目(DD20243429、DD20221689)、中国地质调查局花岗岩成岩成矿地质研究中心开放基金课题(PMGR202111) （DD20243429、DD20221689）
