地质学报2026，Vol.100Issue(2)：469-483,15.DOI:10.19762/j.cnki.dizhixuebao.2025382
中国喀斯特型铝土矿中碎屑金红石地球化学和年代学特征及其地质意义
Geochemical and chronological characteristics of detrital rutile in the karst bauxite of China and its geological significance
摘要
Abstract
Since the Paleozoic,different tectonic plates around the world have formed abundant karst bauxite deposits at varying times.Their complex genesis preserves not only paleoclimatic signatures but also records important geological events,including plate tectonic evolution.Detrital rutile,a refractory accessory mineral in karst bauxite,possesses high chemical stability and records key tectonic events throughout geological history.Based on trace element geochemistry and U-Pb geochronology of rutile from 23 karst bauxite deposits in the North China craton and South China block,this study systematically explores genetic types and their links to supercontinent evolution.Results show that rutile in Chinese karst bauxite of different ages is mainly metamorphic in origin,though their formation conditions differ.Rutile in the Late Carboniferous bauxite of the North China craton records relatively high metamorphic temperatures(granulite facies),while rutile from bauxite in the South China block records lower temperatures(amphibolite to granulite facies).The Late Carboniferous bauxite in the North China craton contains abundant metamorphic rutile associated with the assembly of the Nuna supercontinent,revealing that the North China craton was widely involved in Nuna assembly,and the resulting metamorphic suites served as the provenance for Carboniferous bauxite deposits.Rutile formed during the breakup of Rodinia and the assembly of Gondwana is generally recorded in bauxites of different periods from the South China block,indicating its deep involvement in these two stages of supercontinent evolution.The metamorphic rocks formed during these events provided key material for bauxite genesis in the South China block.This study reveals that detrital rutile in bauxite not only constrains the provenance of bauxite but also preserves a record of plate tectonic evolution,providing a new perspective for exploring global tectonic history.关键词
喀斯特型铝土矿/金红石/微量元素/U-Pb年龄/超大陆Key words
karst bauxite/rutile/trace elements/U-Pb age/supercontinent引用本文复制引用
梁荣荣,张统一,胡兆国,张保涛,柳森,刘学飞..中国喀斯特型铝土矿中碎屑金红石地球化学和年代学特征及其地质意义[J].地质学报,2026,100(2):469-483,15.基金项目
本文为新一轮找矿突破战略行动科技支撑项目(编号 ZKKJ202403)和国家重点研发课题(编号 2022YFC2903402)联合资助的成果. （编号 ZKKJ202403）
