现代地质2025，Vol.39Issue(3)：774-786,13.DOI:10.19657/j.geoscience.1000-8527.2024.140
白云母/黑云母Ti地质温度计的适用性:桂东北资源韧性剪切带例析
Applicability of Muscovite/Biotite Ti geothermometers:A Case Study of Ziyuan Ductile Shear Zone in Northeast Guangxi
摘要
Abstract
Different stress regimes and strain rates in nature can influence the transition temperature of rocks from brittleness to ductility,estimating the deformation and metamorphism temperatures of mylonite in ductile shear zones is crucial for interpreting thermochronological results.To assess the applicability of geothermometers(biotite/muscovite Ti geothermometers)in ductile shear zones,our study employed mineral dynamic recrystalli-zation of mylonite and plastic deformation features,such as EBSD quartz<c>-axis fabrics,to estimate the de-formation and metamorphism temperatures of Ziyuan ductile shear zones in Northeastern Guangxi,ranging from 400 to 550 ℃.Through the utilization of electron probe analysis techniques,chemical composition analyses were conducted on newly formed fine-grained biotite and muscovite resulting from dynamic recrystallization dur-ing ductile shearing.By employing biotite/muscovite Ti thermometers,the metamorphic deformation temperature of mylonite in the Ziyuan ductile shear zone were estimated to be between 409-528 ℃ and 458-605 ℃,re-spectively.Through comparative analysis,the temperatures obtained using geothermometers were essentially consistent within the allowable error range with those estimated using plastic deformation features,providing a basis for the application of biotite/muscovite Ti thermometers in extensional ductile shear zones.关键词
桂东北/韧性剪切带/糜棱岩/地质温度计/变形变质温度Key words
Northeast Guangxi/ductile shear zone/mylonite/geothermometer/metamorphic-deformation tem-perature分类
天文与地球科学引用本文复制引用
刘锟,李赛赛,辛良伟,石春燕,耿杰利..白云母/黑云母Ti地质温度计的适用性:桂东北资源韧性剪切带例析[J].现代地质,2025,39(3):774-786,13.基金项目
广西自然科学基金项目(2020JJA150030) （2020JJA150030）
国家自然科学基金项目(42262026). （42262026）
