海南岛东南部海域有用重砂的资源潜力  

RESOURCE POTENTIAL OF VALUABLE HEAVY MINERALS IN THE SOUTHEAST WATER OFF HAINAN ISLAND

作　　者：周娇 蔡观强[1] 邹俪琦 钟和贤 黄永健 ZHOU Jiao;CAI Guanqiang;ZOU Liqi;ZHONG Hexian;HUANG Yongjian(Key Laboratory of Marine Mineral Resources of Ministry of Natural Resources,Guangzhou Marine Geological Survey,China Geology Survey,Guangzhou 510075,China;Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou 511458,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,中国地质调查局广州海洋地质调查局,广州510075 [2]南方海洋科学与工程广东省实验室(广州),广州511458

出　　处：《海洋地质前沿》2021年第12期58-65,共8页Marine Geology Frontiers

基　　金：南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0201);中国地质调查局项目(DD20190627,DD20160138,DD20191002,DD20190209,DD20190378,DD20189642)。

摘　　要：为了进一步查明海南岛东南部海域砂矿资源潜力,在海南岛东南部平均水深30-100 m的海域,通过对815 km的单道地震资料处理解译,发现晚更新世以来研究区发育大量三角洲沉积,为有利砂矿沉积区;并通过在该区域采集的70个表层及23个柱状样沉积物样品进行了重矿物研究,计算了钛铁矿、锆石、金红石、独居石4种有用重砂矿物的品位,讨论了这4种有用重砂矿物平面上和纵向的品位状况。结果表明,有用重砂矿物主要矿种为锆石和独居石,其次为金红石和钛铁矿;有用重砂矿物的富集受到成矿物质来源、沉积物类型、水动力分选等多种因素控制。最终在海南岛东南部海域划分了2个潜在的有用重砂资源成矿远景区,其中黎安港-港坡港近海重砂矿物成矿远景区,平均水深30-60 m,面积为1 019.19 km^(2),沉积厚度约1.5 m,保守估计重砂矿潜在资源量为4.92×10^(8)t,具有较大资源潜力,为将来开采指明方向。For the purpose to evaluate the resource potential of placer deposits between the water depth of 30~100 m in the southeast water off Hainan Island, the latest data acquired by various survey methods are applied.815 km of single channel seismic data are processed and interpreted and a huge amount of deltaic deposits since Late Pleistocene are discovered in the study area, which are favorable for the formation of placer deposits. Based on 70 surface sediment samples and 23 sediment cores collected in this area, the reserve and grades of the four valuable heavy minerals, i.e. ilmenite, zircon, rutile and monazite, are calculated, and the spatial and vertical grade changes of the four valuable heavy sand minerals revealed. The heavy minerals are dominated by zircon and monazite, followed by rutile and ilmenite and the enrichment of the valuable heavy minerals are controlled by many factors, such as the source of ore-forming materials, the type of sediments and the hydrodynamic separation during transportation. Two potential areas of useful heavy sand resources are delineated, which are 30~60 m in water depth, 1 019.19 km;in area and about 1.5 m in thickness. A conservative estimation of the potential heavy sand resources is around 4.92×10;t in amount, that is valuable for further investigation.

关 键 词：单道地震 柱状样 有用重砂 工业品位 潜在资源量 海南岛 

分 类 号：P744.2[天文地球—海洋科学]