摘要
广西平果铝土矿是桂西南地区众多中大型沉积铝土矿的典型代表。文章从构造演化角度就其成矿规律和成因进行了探讨,结果发现:①寒武系含铝质较高的古风化壳是成矿的主要物源之一;②SW—NE向的下雷—灵马断裂带是主要成矿物质运移进入沉积盆地的主要通道,同时并控制着沉积铝土矿的矿石质量,在运移通道周围质量较好,远离运移通道则较差;③NW向的断裂体系与NE向的断裂体系交叉部位控制着右江沉积盆地的发展及其沉积环境,并在沉降最为激烈的二叠纪早期控制着铝土矿的沉积;④古风化壳+海进作用+构造控制的运移通道+构造演化形成的沉积盆地和沉积环境共同作用造就了平果铝沉积铝土矿的成因。
Pingguo bauxite deposit is a typical representative of many medium and large sedimentary bauxite deposits in southwest Guangxi.In this paper,the metallogenic regularity and genesis are discussed from the perspective of tectonic evolution.The results show that:①The ancient weathering crust with high aluminum content in Cambrian is one of the main sources of mineralizing materials;②Xialei-Lingma fault zone in SW-NE direction is the main channel which the main ore-forming material migrate into the sedimentary basin,and also control the ore quality of the bauxite,which is better around the migration channel,but worse away from the migration channel;③The intersection of NW fault system and NE fault system control the development and sedimentary environment of Youjiang sedimentary Basin,and control the deposition of bauxite in the early Permian when the subsidence was the most intense;④The combination of paleo-weathering crust+marine transgression+tectonic-controlled migration channel+tectonic evolution of sedimentary basin and sedimentary environment resulted in the formation of Pingguo aluminum-deposited bauxite.
作者
孟鑫
陈远荣
曹凌飞
高旭民
马旭
MENG Xin;CHEN Yuanrong;CAO Lingfei;GAO Xuming;MA Xu(College of Earth Sciences,Guilin University of Technology,Guilin 541006,Guangxi,China)
出处
《矿产与地质》
2023年第5期914-923,共10页
Mineral Resources and Geology
基金
科技部支撑计划项目(项目编号:RZ18101395)资助。
关键词
沉积型铝土矿
构造演化
成因
广西平果
sedimentary bauxite
tectonic evolution
genesis
Pingguo of Guangxi
作者简介
第一作者:孟鑫(1998-),男,硕士研究生,地球化学专业。E-mail:1474443809@qq.com;通信作者:陈远荣(1963-),男,博士,教授,长期从事地球化学勘查研究工作。E-mail:chenyremail@163.com。
