摘要
贵州北部务川-正安-道真(务正道)地区含铝岩系为二叠系下统大竹园组(P_(1)d),其岩矿石组合主要由黏土岩、铝质岩、铝土矿组成,是受多期次构造旋回运动制约下母岩或原岩在特定古气候、古纬度、古地理、古水文等成岩成矿条件下经风化剥蚀-搬运迁移、暴露淋滤-破碎簸选、沉积改造-后期表生等地质作用下形成的产物;该含铝岩系遵循一定的层序组合,反映了矿物组成、化学组分及沉积相等内在本质的变化特征。务正道地区含铝岩系中铝(Al)、锂(Li)、稀土(REE)富集具有明显的选择性和差异性,表现为铝土矿、锂、稀土等矿产资源在含铝岩系中可以同体伴生,也可以异体共生;铝土矿主要富集于含铝岩系中上部,常见致密状、鲕状、碎屑状、土状或半土状等4种矿石自然类型;Li主要富集于含铝岩系中上部致密状铝质岩或略高于边界品位的致密状铝土矿之中;REE主要富集于含铝岩系下部及底部铁质黏土岩之中。根据含铝岩系地质特征、矿产资源特征及成因等综合分析,本文划分务正道地区早二叠世古地理环境为黔中-黔北古陆-近海平原-滨海湿地-道真海湾,认为道真海湾最利于寻找锂资源,滨海湿地最利于寻找铝土矿,近海平原一定程度不利于地质找矿;根据务正道地区含铝岩系古地理环境、可供下一步勘查优缺点、代表性矿床密集程度及规模等条件分析,本文圈定Ⅰ类深部找矿预测区4个、Ⅱ类深部找矿预测区1个、Ⅲ类深部找矿预测区1个,并确定主攻矿种,提出找矿方向。
The aluminum-bearing rock series in the Wuchuan-Zheng'an-Daozhen area of the northern Guizhou is in theLower Permian Dazhuyuan Formation(P_(1)d).It is mainly composed of clay rock,aluminum rock,and bauxite;It is aproduct of parent rock or original rock through geological processes including weathering and erosion,transportation andmigration,exposure and leaching,fragmentation and selection,sedimentation and reworking,and supergene weatheringconstrained by multiple tectonic cycles under specific diagenetic and ore-forming conditions including paleoclimate,paleolatitude,paleogeography,paleohydrology and others.This aluminum-bearing rock series has a certain sequencecombination which reflected the variation characteristics of inherent properties including mineral composition,chemicalcomposition,and sedimentation facies.There are obvious selective and different,enrichment degrees of aluminum(Al),lithium(Li),and rare earth elements(REE)in the aluminum-bearing rock series in the Wuchuan-Zheng'an-Daozhen area,asthe bauxite,lithium,rare earth elements and other mineral resources can be associated in the same part or enriched indifferent parts of the aluminum bearing rock series.Bauxite is mainly enriched in the middle and upper parts of thealuminum bearing rock series.There are four common natural bauxite types including the compact,oolitic,clastic,earthylor semi-earthy types.Li is mainly enriched in the compact aluminum-bearing rocks in the upper part of the aluminum-bearing rock series or in the compact bauxite whose Al_(2)O_(3) grade is slightly higher than the cutting grade.REE is mainlyenriched in the lower part and irony clay rocks at the bottom of the aluminum-bearing rock series.Based on thecomprehensive analysis of the geological characteristics,mineral resource characteristics,and genesis of the aluminum-bearing rock series,the early Permian paleogeographic environment in the Wuchuan-Zheng'an-Daozhen area has beenclassified into the Qianzhong-Qianbei ancient land,nearshore plain,coastal wetland,and Daozhen Bay.It is believed thatthe Daozhen Bay is most conducive for searching lithium resources,the coastal wetland is most conducive for searchingbauxite,and the nearshore plain is unfavorable for geological exploration to some extent.Based on the analysis of thepaleogeographical environment of the aluminum-bearing rock series in the Wuchuan-Zheng'an-Daozhen area,advantagesand disadvantages for further exploration,densities and scales of representative mineral deposits,and other conditions ofWuchuan-Zheng'an-Daozhen area,four Type Ⅰ,one Type Ⅱ,and one Type Ⅲ targets for exploration prediction of mineralresources in depth have been delineated,their main ore types have been determined,and the direction of mineralexploration has been proposed.
作者
宋小军
曾道国
金中国
巩鑫
姜伟
郑明泓
周文龙
杜蔺
苏永虎
杨志忠
付桥林
李光春
SONG Xiaojun;ZENG Daoguo;JIN Zhongguo;GONG Xin;JIANG Wei;ZHENG Minghong;ZHOU Wenlong;DU Lin;SU Yonghu;YANG Zhizhong;FU Qiaolin;LI Guangchun(Geological and Mineral Exploration Institute,Nonferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang Guizhou 550005,China;The Ministry of Natural Resources High level Science and Technology Innovation Talent Project(Geological Exploration Direction)Aluminum bearing Rock Series Lithium Resource Metallogenic Law and Exploration Research Innovation Team,Guiyang Guizhou 550005,China;Nonferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang Guizhou 550005,China)
出处
《矿物学报》
北大核心
2025年第4期786-806,共21页
Acta Mineralogica Sinica
基金
黔科合战略找矿项目(编号:[2022]ZD002)
贵州省新一轮找矿突破战略行动项目(编号:[2023]119)
贵州省有色金属和核工业地质勘查局科研项目(编号:GZYSKY2023-1)。
关键词
含铝岩系
铝土矿
锂资源
关键金属资源
矿产资源成因
深部找矿预测
务正道地区
aluminum-bearing rock series
bauxite deposits
lithium resources
key metal resources
metallogenesis
exploration prediction of mineral resources in depth
the Wuchuan-Zheng'an-Daozhen area
