莱州湾东岸三山岛地区表层土壤矿物分析及其意义  

Minerals of Soil in Sanshandao on the East Coast of Laizhou Bay and Its Significance

作　　者：邱君炜 曹建劲 刘翔[1,2,3,4] 党万强 邓永康 QIU Jun-wei;CAO Jian-jin;LIU Xiang;DANG Wan-qiang;DENG Yong-kang(School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China;Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China)

机构地区：[1]中山大学地球科学与工程学院,广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广州510275 [3]广东省地球动力作用与地质灾害重点实验室,广州510275 [4]南方海洋科学与工程广东省实验室(珠海),珠海519082

出　　处：《科学技术与工程》2020年第24期9764-9770,共7页Science Technology and Engineering

基　　金：国家重点研发计划(2016YFC0600602)。

摘　　要：为深入了解莱州湾东岸三山岛地区的表层地质特征,使用X射线衍射、近红外光谱技术和土壤含盐量测试方法,对研究区表层土壤进行矿物成分及其特征识别,综合分析发现:研究区表层土壤主要由白云母、方解石、石英、硅灰石、伊利石、高岭石、绿泥石、菱镁矿、磷灰石等9种矿物组成,根据近红外光谱特征峰分析,土壤样品中白云母Al—OH的吸收峰集中在2206 nm附近,位于2200~2210 nm,表明其为形成于较低温度的富Al、K白云母;样品中绿泥石Fe—OH的吸收峰集中在2245 nm处,位于2240~2250 nm,并结合X射线衍射分析结果可以确定其为富镁绿泥石,符合绿泥石在表生环境中的地球化学特征。土壤含盐量平均值为1.195 g/kg,属轻度盐渍化。结果表明:有效识别了研究区土壤矿物成分及组合,为未来找矿相关研究提供土壤矿物成分背景信息;土壤矿物成分及组合与研究区地质背景和地表气候环境条件密切相关,土壤含盐量测试结果提示研究区可能存在一定的土壤盐渍化风险。使用X射线衍射和近红外光谱技术及土壤含盐量测试进行综合分析,具有快速简单、经济环保、精确可靠等优势,为土壤矿物研究提供了一种科学的技术手段和方法。To further understand the surface geological characteristics of the Sanshandao area on east coast of Laizhou Bay,X-ray diffraction,near infrared spectroscopy and soil salinity testing methods were adopted to identify the mineral composition and characteristics of the surface soil in the study area.The comprehensive analysis shows that the surface soil of the study area mainly consists of nine minerals,including muscovite,calcite,quartz,wollastonite,illite,kaolinite,chlorite,magnesite,apatite and others.Based on the analysis of characteristic peaks of near infrared spectrum,the absorption peak of muscovite Al—OH in soil sample is concentrated around 2206 nm within the range of 2200 nm to 2210 nm,indicating that it is rich in Al and K muscovite formed at lower temperature.The absorption peak of chlorite Fe—OH in the sample is concentrated at 2245 nm within the range of 2240 nm to 2250 nm.Based on the X-ray diffraction analysis results,it can be determined to be magnesium-rich chlorite,which conforms to the geochemical characteristics of chlorite in supergene environment.The average salt content of soil is 1.195 g/kg,which is slight salinization.The results show that this research has effectively identified the composition and combination of soil minerals in the study area,and provides reference information of soil mineral composition for future mineral exploration related researches.Moreover,the composition and combination of soil minerals are closely related to the geological background and surface climate and environmental conditions of the study area,and the test results of soil salinity indicate that there may be certain risks of soil salinization in the research area.Comprehensive analysis with X-ray diffraction,near infrared spectroscopy and soil salt content test has the advantages of rapidness and simplicity,lower cost,environmental protection,high accuracy and reliability.It provides a scientific technical means and method for soil mineral research.

关 键 词：莱州湾东岸 近红外光谱 X射线衍射 土壤 

分 类 号：P575[天文地球—矿物学]