Limited Contribution of Preferential Dissolution to Radiogenic Uranium Isotope Disequilibrium Observed in Weathered Moraines

作     者：Laifeng Li Laura FRobinson Tianyu Chen Zhewen Xu Jun Chen Gaojun Li Laifeng Li;Laura F.Robinson;Tianyu Chen;Zhewen Xu;Jun Chen;Gaojun Li

作者机构：MOE Key Laboratory of Surficial GeochemistryDepartment of Earth and Planetary SciencesNanjing UniversityNanjing 210023China School of Geography and Ocean ScienceNanjing UniversityNanjing 210023China School of Earth SciencesUniversity of BristolBristol BS81RJUK Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第1期

页      面：57-66页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the Royal Society-Newton Advanced Fellowship(No.NA201244) the Natural Science Foundation of China(Nos.42061130212,41991321,41877351,41761144058,and 41730101) the Second Tibetan Plateau Scientific Expedition and Research(STEP) Program(No.2019QZKK0707) the Fundamental Research Funds for the Central Universities(No.0206-14380124) support from the China Scholarship Council Fellowship 

主　　题：preferential dissolution uranium isotope disequilibrium Gongga Mountain comminution comminution age etch pits 

摘      要：Radiogenic uranium isotope disequilibrium(^(234)U/^(238)U) has been used to trace a variety of Earth surface processes,and is usually attributed to direct recoil of ^(234)Th and preferential dissolution of radioactively damaged lattices at the mineral ***,the relative contribution of these two mechanisms in the natural environment remains unresolved,making it hard to use the extent of disequilibrium to quantify processes such as *** study tests the contribution of preferential dissolution using well-characterized weathered moraines and river sediments from the southeastern Tibetan *** observations show that weathering of recent moraines where the contribution from direct recoil is negligible and is not associated with depletion of ^(234)U at the mineral *** suggests a limited role for preferential dissolution in this *** attribute this lack of preferential dissolution to a near-to-equilibrium dissolution at the weathering interfaces,with little development of etch pits associated with radioactively damaged energetic sites.