海南岛周边浅海砂矿资源潜力浅析

摘要

There exist the most abundant littoral Zr-Ti placer resources of China in Hainan Island.Nevertheless,with largescale exploitation for a long time,the littoral placer resources in land area are dwindling gradually.Surrounded by sea,Hainan Island,has long coastline with broad and sandy coast,which is particularly favorable for the formation of marine placer deposits.This paper summarizes the exploration status and results of neritic placer resources in Hainan Island offshore area in recent years,and analyzes the geological characteristics of placer deposits.From five factors such as provenances,climate and hydrodynamic conditions,coastal type and geomorphic type,the quaternary sedimentation,and fluctuation of sea level,synthetically analysis of the minerogenic conditions was conducted The ore-controlling factors of neritic placer deposits is also expounded.On this base,combining the historical survey data,with systematical analysis of the ore-forming beneficial factors,this text identified four pieces of neritic regions with good potential of placer resources,namely the areas from south Dong'ao Tow of Houhai sea to the Tiantou Harbor in Wanning City,from Gancheng Town in Dongfang City to west Ledong County of Yinggehai Sea,from Puqian Bay to Jingxin Cape in Wenchang City,and from Maniao Harbor to Dongying Harbor in Lin'gao County.These four neritic regions are important prospecting targets for placer deposits exploration in future.%海南岛拥有全国最为丰富的滨海锆钛砂矿资源,然而,随着长期大规模矿产的开发,陆域滨海砂矿资源已日渐枯竭.海南岛四面环海,海岸线漫长,多为砂质海岸,沙滩宽广,特别有利于海洋砂矿的形成.本文总结了近年来海南岛周边浅海砂矿资源勘查现状和勘查成果,分析了区内砂矿的地质特征,从物源、气候与水动力条件、海岸类型与地貌类型、第四纪沉积作用和海平面变化等5个方面综合分析砂矿的成矿条件,阐述了浅海砂矿的成矿控制因素.在此基础上,结合历史调查资料,从成矿的有利因素进行系统分析,认为万宁市东澳南后海至田头港一带、东方感城至乐东莺歌海一带、文昌铺前湾至景心角一带和临高马袅至东英一带等4个浅海区具有较好的砂矿资源潜力,它们可作为今后该区砂矿勘查的重要靶区.