江陵凹陷古新世地下卤水型硼矿成因研究  

A study of the genesis of Paleocene underground brine boron deposits in Jiangling Depression

作　　者：王春连[1] 孟令阳 刘成林[1] 余小灿 颜开 刘思晗 游超 栗克坤 滕晓华 WANG Chun-lian;MENG Ling-yang;LIU Cheng-lin;YU Xiao-can;YAN Kai;LIU Si-han;YOU Chao;LI Ke-kun;TENG XIAO-hua(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;No.902 Geological Party,Jiangxi Bureau of Geology and Exploration and Development of Mineral Resources,Xinyu 338099,China;Kunming University of Science and Technology,Kunming 650093,China;Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China;Henan Geological Bureau of CCGMB,Zhengzhou 450000,China;Department of Tourism,Resources and Environment,Zaozhuang University,Zaozhuang 277160,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]江西省地质矿产勘查开发局九〇二地质大队,江西新余338099 [3]昆明理工大学,云南昆明650093 [4]中国地质大学地质调查研究院,湖北武汉430074 [5]中化地质矿山总局河南地质局,河南郑州450000 [6]枣庄学院旅游与资源环境学院,山东枣庄277160

出　　处：《岩石矿物学杂志》2021年第1期1-13,共13页Acta Petrologica et Mineralogica

基　　金：中央级公益性科研院所基本科研业务费专项(KK2005,KK2016);国家自然科学基金项目(U20A2092,42002106,41907262,41502089);国家973计划项目(2011CB403007);中国地质调查局地质矿产调查评价专项项目(DD20190816,DD20190817,DD20190606)。

摘　　要：中国探明硼资源主要分布于东北和青藏等地区,矿床品位低,共伴生矿物多,开发成本高,开发利用程度低,难以满足产业发展需求。目前,在江汉盆地江陵凹陷勘探中发现卤水中B2O3浓度达3 g/L,Li、K、Br、I、Rb、Cs含量超过工业品位,综合利用价值高。本文在前人研究的基础上,对江陵凹陷新生代卤水型硼矿开展水化学、同位素地球化学及实验地球化学分析,重点研究了古气候、构造和玄武岩等对卤水成矿的影响,探究其成因机制。研究初步认为,不同的储卤层岩性具有不同的地球化学和同位素特征,玄武岩有强烈的蚀变,说明地下流体对火成岩发生了交代作用,玄武岩的水-岩反应是富硼卤水矿的重要物质来源;一定盐度的流体有利于硼离子的活化,高盐度流体是硼成矿元素主要的迁移载体,表生环境下干热的古气候使含矿水体蒸发浓缩是富硼卤水富集成矿的重要形成机制。The proved boron resources in China are mainly distributed in Northeast China,Qinghai,Tibet and some other regions.These deposits have low grade,many associated minerals,high development cost and low development and utilization degree,and hence it is difficult for them to meet the needs of industrial development.At present,exploration in Jiangling Depression of Jianghan Basin shows that the B2O3 concentration in the brine reaches 3 g/L,and the content of lithium,potassium,bromoiodide,rubidium and cesium exceeds the industrial grade,with high comprehensive utilization value.On the basis of previous studies,the authors studied hydrochemistry,isotopic geochemistry and experimental geochemistry of Cenozoic brine boron deposits in Jiangling Depression in this paper,with the emphasis placed on the influence of paleoclimate,structure and provenance on brine mineralization as well as the genetic mechanism.It is preliminarily concluded that different halogen lithologies have different geochemical and isotopic characteristics,and basalt has experienced strong alteration,indicating that underground fluid metasomatism of igneous rocks exists,and the water-rock reaction of basalt is an important material source of boron-rich brine deposits.The fluid with a certain salinity is more conducive to the activation of boron ions.The fluid with a high salinity is the main transport carrier of boron ore-forming elements.The evaporation and concentration of ore-bearing water in the dry and hot paleoclimate under the supergenic environment constitute an important process for the enrichment and mineralization of boron-rich brine.

关 键 词：江陵凹陷 古新世 火山喷发 水-岩反应 富硼卤水 成因研究 

分 类 号：P611.5[天文地球—矿床学] P597[天文地球—地质学]