地质与资源2026，Vol.35Issue(1)：48-62,15.DOI:10.13686/j.cnki.dzyzy.2026.01.005
桂西扶绥地区含铝岩系地球化学特征研究
Geochemical characteristics of aluminous rock series in Fusui area,western Guangxi
摘要
Abstract
To investigate the paleoclimate,paleo-weathering characteristics,sediment provenance,and tectonic setting,the study conducts a geochemical analysis on the extensively developed aluminum-bearing rock series within the lower part of the Upper Permian Heshan Formation in Fusui area of western Guangxi Region.The results reveal significant differences in the major oxide components(Al2O3,SiO2,and Fe2O3)between the upper and lower layers,while the loss on ignition(LOI)and TiO2 content show only minor variations.The total rare earth element(REE)content varies slightly,and most trace elements are enriched to varying degrees,except for Rb,Sr,Ba,and Ti.Provenance analysis indicates that the detrital material was mainly sourced from intermediate igneous rocks,with a subordinate contribution from felsic igneous rocks.The rock series formed through intense chemical weathering under warm,alternating wet and dry climatic conditions and was deposited in a continental anoxic-dysoxic(locally dysoxic-suboxic)environment on a passive continental margin.Detrital zircon U-Pb ages are predominantly concentrated around 260 Ma.The presence of volcanic ash fragments,as well as crystal and glass shards derived from andesite,basalt,and feldspar,suggests a close genetic relationship between diagenesis/mineralization and coeval magmatic eruptions.The volcanic ash may have originated from the Emeishan Large Igneous Province or the Southwestern Volcanic Island Arc,although contributions from isolated volcanoes within Youjiang Basin cannot be ruled out.关键词
含铝岩系/地球化学/物源/沉积环境/构造背景/广西Key words
aluminous rock series/geochemistry/provenance/sedimentary environment/tectonic setting/Guangxi分类
天文与地球科学引用本文复制引用
韦访,覃瑞才,陈海武,黄宝宁,关会明..桂西扶绥地区含铝岩系地球化学特征研究[J].地质与资源,2026,35(1):48-62,15.基金项目
中国地质调查局"中国矿产地质志"项目(DD20221695,DD20190379,DD20160346) （DD20221695,DD20190379,DD20160346）
"广西矿产地质志续编与产品服务"项目(KD-[2022]-XZ-026,KD-[2023]-XZ-050). （KD-[2022]-XZ-026,KD-[2023]-XZ-050）
