江西科学
江西科學
강서과학
JIANGXI SCIENCE
2015年
4期
546-552
,共7页
新余铁矿%地质地球化学特征%成矿机制%构造变形%江西
新餘鐵礦%地質地毬化學特徵%成礦機製%構造變形%江西
신여철광%지질지구화학특정%성광궤제%구조변형%강서
Xinyu iron deposit%geologic and geochemistry characteristics%metallogenic mechanism%tectonic deformation%Jiangxi Province
在野外地质调查及大量前人研究成果综合分析的基础上,对江西新余铁矿地质及矿床的主量、微量、稀土元素特征进行了系统的研究,并据此探讨了其成矿机制。研究表明,新余铁矿区的褶皱变形应该是岩石复合流变及变形机制转换作用的结果,变形温度约在310~330℃,矿体多受花岗岩体破坏或吞噬并发生强烈的风化剥蚀,钻孔揭示矿体延伸形态复杂多变,具有中深部成矿潜力,但有减薄的趋势；在沉积建造的过程中存在较多碎屑物质的加入,矿石具有Co、Sc、V富集,Rb、U、Mo亏损,ΣREE相对较高,矿石及围岩均具有显著的轻稀土相对亏损和重稀土相对富集的特征,含铁岩段具有明显Eu的负异常及Y的正异常,而Ce负异常的缺乏很可能与沉积成矿时处于氧逸度很低的环境有关；成矿大致经历了沉积成矿、变质变形及改造保存3个期次,其中与找矿关系最为密切的为第3期次。
在野外地質調查及大量前人研究成果綜閤分析的基礎上,對江西新餘鐵礦地質及礦床的主量、微量、稀土元素特徵進行瞭繫統的研究,併據此探討瞭其成礦機製。研究錶明,新餘鐵礦區的褶皺變形應該是巖石複閤流變及變形機製轉換作用的結果,變形溫度約在310~330℃,礦體多受花崗巖體破壞或吞噬併髮生彊烈的風化剝蝕,鑽孔揭示礦體延伸形態複雜多變,具有中深部成礦潛力,但有減薄的趨勢；在沉積建造的過程中存在較多碎屑物質的加入,礦石具有Co、Sc、V富集,Rb、U、Mo虧損,ΣREE相對較高,礦石及圍巖均具有顯著的輕稀土相對虧損和重稀土相對富集的特徵,含鐵巖段具有明顯Eu的負異常及Y的正異常,而Ce負異常的缺乏很可能與沉積成礦時處于氧逸度很低的環境有關；成礦大緻經歷瞭沉積成礦、變質變形及改造保存3箇期次,其中與找礦關繫最為密切的為第3期次。
재야외지질조사급대량전인연구성과종합분석적기출상,대강서신여철광지질급광상적주량、미량、희토원소특정진행료계통적연구,병거차탐토료기성광궤제。연구표명,신여철광구적습추변형응해시암석복합류변급변형궤제전환작용적결과,변형온도약재310~330℃,광체다수화강암체파배혹탄서병발생강렬적풍화박식,찬공게시광체연신형태복잡다변,구유중심부성광잠력,단유감박적추세；재침적건조적과정중존재교다쇄설물질적가입,광석구유Co、Sc、V부집,Rb、U、Mo우손,ΣREE상대교고,광석급위암균구유현저적경희토상대우손화중희토상대부집적특정,함철암단구유명현Eu적부이상급Y적정이상,이Ce부이상적결핍흔가능여침적성광시처우양일도흔저적배경유관；성광대치경력료침적성광、변질변형급개조보존3개기차,기중여조광관계최위밀절적위제3기차。
On the basis of the field geological investigation and a lot of previous research results,a systematic analysis has been carried out the geologic features as well as the characteristics of major elements,trace elements and REE of Xinyu iron deposit in Jiangxi Province,then the metallogenic mechanism was investigated. It is shown that the fold deformations is a result of composite rock rheo-logical effects and the transformation of deformation mechanisms,deformation temperature is 310 ℃to 330 ℃. Most of the ore bodies are destroyed or swallowed by granitic bodies, and also strongly weathered and denudated. According to multiple drilling,the most potential mineralization of Xinyu ore field may be medium-deep seated for the complicated and changing shape of ore bodies exten-ding,but has a tendency to thinning. There are relatively more detrital materials to join the process of sedimentary formation,the total REE content in iron ore is relatively high with positive Co,Sc,V and negative Rb,U,Mo. The obvious deficit of light rare earth and the relative enrichment of heavy one happen to be in the iron ore and the wall rock,while the ferruginous rock section have distinctly neg-ative Eu and positive Y,but the lack of negative Ce is likely to related to the sedimentary mineraliza-tion is in very low oxygen fugacity environment. The formation of iron ore deposit normally goes through three metallogenic stages:sedimentation-mineralization,metamorphism-deformation and re-formation-preservation,Which the third phase is the closest relationship with the prospecting.
