高校地质学报2024，Vol.30Issue(2)：178-195,18.DOI:10.16108/j.issn1006-7493.2022093
桂东南岑溪—陆川地区斜长角闪岩的年代学、地球化学特征及其地质意义
Geochronology,Geochemistry and Geological Significance of Amphibolites in Cenxi-Luchuan Area,Southeastern Guangxi
摘要
Abstract
Zircon U-Pb geochronology and whole-rock geochemistry of amphibolites in Cenxi-Luchuan area,southeastern Guangxi are analyzed in this study.The results show that the amphibolites are probably formed later than the Early Palaeozoic(487-428 Ma).The Mid-Neoarchean zircons reveal that the unexposed Archean crystalline basement might be existed.The whole-rock geochemistry shows that the amphibolites are enriched in large ion lithophile elements(LILE)such as K,Rb,Ba,Sr,etc.,and light rare earth elements relative to the original mantle.They are obviously depleted in high field strength elements(HFSE)such as Nb,Ta,Ti,etc.,similar to the characteristics of island arc basalt(IAB).The amphibolites are formed by melting the mantle wedge of ancient subduction metasomatism,which might be in the lithospheric extension stage after collision in the Early Paleozoic.关键词
早古生代构造事件/斜长角闪岩/锆石年代学/地球化学/岩石学/桂东南Key words
Early Paleozoic tectonic events/amphibolites/zircon geochronology/geochemistry/petrology/Southeastern Guangxi分类
天文与地球科学引用本文复制引用
梁任鑫,时毓,庞超伟,刘希军..桂东南岑溪—陆川地区斜长角闪岩的年代学、地球化学特征及其地质意义[J].高校地质学报,2024,30(2):178-195,18.基金项目
国家自然科学基金项目(42372083) （42372083）
广西自然科学基金杰出青年基金项目(2019GXNSFFA245005)联合资助 （2019GXNSFFA245005）
