中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2015年
4期
1039-1048
,共10页
侯东壮%吴湘滨%李贞%刘玉红
侯東壯%吳湘濱%李貞%劉玉紅
후동장%오상빈%리정%류옥홍
物质来源%大河边重晶石矿床%同位素%稀土元素
物質來源%大河邊重晶石礦床%同位素%稀土元素
물질래원%대하변중정석광상%동위소%희토원소
material source%Dahebian barite deposit%isotope%rare earth element
为探明大河边重晶石矿床的物质来源,在分析矿床地质的基础上,系统研究矿石矿物的同位素组成、稀土元素及有机地球化学特征。结果表明:样品中δ18OSMOW与δ34SV-CDT呈正比关系,推测氧和硫元素以SO42?的形式参与成矿;δ34SV-CDT值较高表明硫可能来源于热液与海水,高34S 值是由热液体系中硫同位素分馏和海洋中还原细菌分馏造成的。矿石和围岩具有相似的高轻重稀土元素比、负铈异常及正铕异常等特征,表明它们都为热水沉积产物。生物标志物指标表明:有机质主要源自于海相低等菌藻类浮游生物。综合成矿背景和锶同位素特征研究,推测钡主要来源于热水沉积作用。综合同位素、稀土元素和有机地球化学研究认为,大河边重晶石矿床的成矿物质主要来源于海水和热水沉积作用,地壳和地幔均提供物质来源,且海洋生物参与成矿。
為探明大河邊重晶石礦床的物質來源,在分析礦床地質的基礎上,繫統研究礦石礦物的同位素組成、稀土元素及有機地毬化學特徵。結果錶明:樣品中δ18OSMOW與δ34SV-CDT呈正比關繫,推測氧和硫元素以SO42?的形式參與成礦;δ34SV-CDT值較高錶明硫可能來源于熱液與海水,高34S 值是由熱液體繫中硫同位素分餾和海洋中還原細菌分餾造成的。礦石和圍巖具有相似的高輕重稀土元素比、負鈰異常及正銪異常等特徵,錶明它們都為熱水沉積產物。生物標誌物指標錶明:有機質主要源自于海相低等菌藻類浮遊生物。綜閤成礦揹景和鍶同位素特徵研究,推測鋇主要來源于熱水沉積作用。綜閤同位素、稀土元素和有機地毬化學研究認為,大河邊重晶石礦床的成礦物質主要來源于海水和熱水沉積作用,地殼和地幔均提供物質來源,且海洋生物參與成礦。
위탐명대하변중정석광상적물질래원,재분석광상지질적기출상,계통연구광석광물적동위소조성、희토원소급유궤지구화학특정。결과표명:양품중δ18OSMOW여δ34SV-CDT정정비관계,추측양화류원소이SO42?적형식삼여성광;δ34SV-CDT치교고표명류가능래원우열액여해수,고34S 치시유열액체계중류동위소분류화해양중환원세균분류조성적。광석화위암구유상사적고경중희토원소비、부시이상급정유이상등특정,표명타문도위열수침적산물。생물표지물지표표명:유궤질주요원자우해상저등균조류부유생물。종합성광배경화송동위소특정연구,추측패주요래원우열수침적작용。종합동위소、희토원소화유궤지구화학연구인위,대하변중정석광상적성광물질주요래원우해수화열수침적작용,지각화지만균제공물질래원,차해양생물삼여성광。
Based on the research of geological characteristics of the Dahebian deposit, the compositions of S, O, Sr isotopes, rare earth elements and organic geochemistry were systematically studied to discuss the material sources of the Dahebian barite deposit. The positive correlation between δ18OSMOW and δ34SV-CDT in the ores proves that S and O elements were involved as SO42?. Highδ34SV-CDT was caused by sulfur isotope fractional distillation in the hydrothermal fliud and sulfate reducing bacteria fractional in seawater, which suggests that sulfur may be derived from hydrothermal fluid and seawater. Meanwhile, the ore and wall rock have almost the same high ratio of light rare earth elements(LREE) to heavy rare earth elements(HREE), Eu and Ce anomalous, which indicates that they are the product of hydrothermal sedimentation. Additionally, biomarkers show that the organic matter is mainly sourced from the lower organisms, such as marine bacteria and algae. According to comprehensive research on metallogenic setting and Sr isotope, the material of barium mainly comes from submarine hydrothermal sediments. Comprehensively, it is believed that the ore-forming material may mainly comes from the seawater and hydrothermal sedimentation, both crustal and mantle components play important roles in providing material. Besides, lower marine organisms are involved.