摘要
广西海岸带作为我国重要的滨海砂矿成矿带,锆铪资源找矿潜力较大,但其分布规律与找矿方向尚待系统研究。基于广西区域地质调查、锆铪矿潜力调查与普查、海域第四纪沉积物源汇研究等项目资料,将重砂专项地质测量数据、矿产地质钻探数据、年代学数据和地球化学数据进行多源融合,并结合典型矿床解剖,系统分析了广西海岸带锆铪矿的分布特征与成矿条件。研究表明:区内锆铪矿含量为0.31~2.68 kg/m^(3),以滨海砂矿为主,集中分布于大风江口和南流江口滨海阶地、南流江中下游河流阶地、钦州湾和防城港河口-沙坝体系以及廉州湾和防城港湾近岸海域成矿带;矿物富集受控于物源供给、水动力分选及第四纪沉积环境;年代学研究显示,该地区的物源比较广泛,主要为印支期花岗岩,同时受多期次构造演化影响;地球化学异常显示Zr-Hf元素与Ti相关性良好,主要分布于黏土和含黏土的地层中。基于上述结果,提出“构造-物源-水动力-沉积”四元控矿模型,为广西海岸带锆铪资源勘探与开发提供科学依据。
The coastal zone of Guangxi is an important coastal placer metallogenic belt in China,with significant potential for zirconium-hafnium(Zr-Hf)resource occurrence.However,its distribution patterns and prospecting directions await systematic research.Based on data from Guangxi regional geological surveys,Zr-Hf ore potential surveys,general surveys,and studies on the source-sink system of Quaternary sediments in marine areas,this paper integrates multi-source data including heavy mineral geological survey data,mineral geological drilling data,chronostratigraphic data,and geochemical data and combines the analysis of typical ore deposits to systematically examine the distribution characteristics and metallogenic conditions of Zr-Hf deposits in the Guangxi coastal zone.The research reveals that Zr-Hf deposits in the region are dominated by coastal placers,with grades ranging from 0.31 to 2.68 kg/m^(3).They are concentrated in the following areas:coastal terraces of the Dafeng River estuary,coastal terraces of the Nanliu River estuary,fluvial terraces in the middle and lower reaches of Nanliu River,Qinzhou Bay estuary-bar system,Fangchenggang estuary-bar system,nearshore metallogenic belt of Lianzhou Bay,and nearshore metallogenic belt of Fangchenggang Bay.Mineral enrichment is controlled by material source supply,hydrodynamic sorting,and Quaternary sedimentary environments.Chronostratigraphic data indicate that the material sources in this area are extensive,primarily Indosinian granite,and influenced by multi-stage tectonic evolution.Geochemical anomalies show a strong correlation between Zr-Hf elements and Ti,with these elements mainly distributed in clay and clay-bearing strata.This study proposes a“tectonics-material source-sedimentation-hydrodynamics”four-factor ore-controlling model,which provides a scientific basis for the exploration and development of Zr-Hf resources in the Guangxi coastal zone and is of great significance for ensuring the supply of strategic mineral resources.
作者
刘枝刚
朝鲁
陈志泉
黄桂锋
农明智
孙懿
韦绍鹏
陈艺发
陆妍慧
LIU Zhigang;CHAO Lu;CHEN Zhiquan;HUANG Guifeng;NONG Mingzhi;SUN Yi;WEI Shaopeng;CHEN Yifa;LU Yanhui(Guangxi Marine Geological Survey Institute,Beihai 536000,China)
出处
《桂林理工大学学报》
北大核心
2025年第4期487-496,共10页
Journal of Guilin University of Technology
基金
广西科技厅重点研发计划项目(桂科AB24010009)
广西地矿局项目(桂地矿综研〔2023〕3号)
广西自然资源厅找矿突破项目(桂自然资函〔2024〕743号)。
关键词
锆铪
滨海砂矿
战略性矿产资源
四元控矿模型
广西海岸带
zirconium and hafnium
coastal placer deposits
strategic mineral resources
quaternary ore control model
coastal zone of Guangxi
