宁夏工程技术
寧夏工程技術
저하공정기술
NINGXIA ENGINGEERING TECHNOLOGY
2012年
2期
101-106
,共6页
仲佳鑫%李欢%李鹏%王辉%孙涛
仲佳鑫%李歡%李鵬%王輝%孫濤
중가흠%리환%리붕%왕휘%손도
宁夏香山%地质特征%矿床成因%次生淋滤富集
寧夏香山%地質特徵%礦床成因%次生淋濾富集
저하향산%지질특정%광상성인%차생림려부집
Xiangshan%Ningxia%geologic characteristics%deposit genesis%secondary enrichment
为了研究宁夏中卫香山地区铁矿床的成因及成矿规律,对宁夏中卫香山地区典型铁矿床(点)成矿地质背景、矿床地球化学等方面进行了分析与探讨.结果表明:中卫香山地区铁矿体呈似层状、透镜状,主要沿层间断裂破碎带分布,具有明显的层控特征.矿石矿物主要为赤铁矿和褐铁矿为主,局部见有黄铁矿.香山群硅质岩w(SiO2)为71.74%~92.45%,w(Al2O3)/[w(Al2O3)+w(Fe2O3)]比值显示大部分样品与大陆边缘硅质岩数据接近.稀土元素PAAS标准化图解表现为平坦型,具有轻微的正铕异常;微量元素在北美页岩标准化图解上变化较大,可能与陆源物质的加入有关.矿床经历了同生沉积期和次生淋滤富集期,含矿溶液沿破碎带及节理渗透时,置换了岩石中含铁的碳酸盐成分成矿,成矿元素在表生氧化条件下淋滤富集.
為瞭研究寧夏中衛香山地區鐵礦床的成因及成礦規律,對寧夏中衛香山地區典型鐵礦床(點)成礦地質揹景、礦床地毬化學等方麵進行瞭分析與探討.結果錶明:中衛香山地區鐵礦體呈似層狀、透鏡狀,主要沿層間斷裂破碎帶分佈,具有明顯的層控特徵.礦石礦物主要為赤鐵礦和褐鐵礦為主,跼部見有黃鐵礦.香山群硅質巖w(SiO2)為71.74%~92.45%,w(Al2O3)/[w(Al2O3)+w(Fe2O3)]比值顯示大部分樣品與大陸邊緣硅質巖數據接近.稀土元素PAAS標準化圖解錶現為平坦型,具有輕微的正銪異常;微量元素在北美頁巖標準化圖解上變化較大,可能與陸源物質的加入有關.礦床經歷瞭同生沉積期和次生淋濾富集期,含礦溶液沿破碎帶及節理滲透時,置換瞭巖石中含鐵的碳痠鹽成分成礦,成礦元素在錶生氧化條件下淋濾富集.
위료연구저하중위향산지구철광상적성인급성광규률,대저하중위향산지구전형철광상(점)성광지질배경、광상지구화학등방면진행료분석여탐토.결과표명:중위향산지구철광체정사층상、투경상,주요연층간단렬파쇄대분포,구유명현적층공특정.광석광물주요위적철광화갈철광위주,국부견유황철광.향산군규질암w(SiO2)위71.74%~92.45%,w(Al2O3)/[w(Al2O3)+w(Fe2O3)]비치현시대부분양품여대륙변연규질암수거접근.희토원소PAAS표준화도해표현위평탄형,구유경미적정유이상;미량원소재북미혈암표준화도해상변화교대,가능여륙원물질적가입유관.광상경력료동생침적기화차생림려부집기,함광용액연파쇄대급절리삼투시,치환료암석중함철적탄산염성분성광,성광원소재표생양화조건하림려부집.
In order to study the genesis and ore-forming rule of ore deposits in Xiangshan area,Zhongwei,Ningxia,geological background and geochemistry and genesis are analyzed and discussed for the typical iron ore deposits.The results show that the iron deposits body distributes mainly along the fractured zone between the rock layers with obvious features of strata bound,bedded and lenticular like.Ore minerals are mainly hematite and limonite,locally pyrite.Siliceous rocks w(SiO2) is 71.74% to 92.45%,w(Al2O3)/[w(Al2O3)+w(Fe2O3)] is close to the continental margin cherts data in most samples.PAAS standardized graphic performance for rare earth elements are flat with slight positive Eu anomaly;trace elements in the North American shale-normalized diagram indicates a big change,which may be related to be joined the addition of terrigenous matter.The deposits experienced the syndepositional period and leaching of secondary enrichment period.The ore-bearing solution replaced the carbonate components while it infiltrated into rocks through the fracture zones and joints,and then,the ore-forming elements enriched in the supergene oxidizing conditions.