矿产与地质
礦產與地質
광산여지질
MINERAL RESOURCES AND GEOLOGY
2015年
3期
353-363
,共11页
金矿床%主量元素%微量元素%稀土元素%地球化学特征
金礦床%主量元素%微量元素%稀土元素%地毬化學特徵
금광상%주량원소%미량원소%희토원소%지구화학특정
gold deposit%major element%trace element%rare earth element%geochemical characteristic
通过研究黄沟金矿床中岩石地球化学特征,从而探讨太华群地层对于该区金矿床成矿的作用。研究表明(1)本区的片麻岩原岩主要为火成岩,属高钾钙碱性系列,且金矿石一般都明显贫钠而富钾、富钙,SiO 2含量普遍较高,Au 品位随 SiO 2的含量增高而呈正相关变化；(2)微量元素特征表明矿石样品以Rb、Ta、Ti 等元素强烈亏损,Ba、Sm 和 Y 元素强烈亏损为特征,与太华群片麻岩和熊耳群安山岩的标准化分布曲线型式接近,说明金矿化可能与太华群片麻岩和(或)熊耳群安山岩具有成因上的联系；(3)稀土元素特征表明多数金矿石的轻稀土略亏损、重稀土略富集,弱负铕异常与矿区出露的各类岩石的稀土元素标准化分布曲线(右倾型)不同,而具深源特性；个别金矿石的标准化曲线形态一定程度上具片麻岩或(和)安山岩的特征,呈弱负铕异常的右倾形态,暗示了太华群片麻岩和(或)熊耳群安山岩也贡献了部分成矿物质。
通過研究黃溝金礦床中巖石地毬化學特徵,從而探討太華群地層對于該區金礦床成礦的作用。研究錶明(1)本區的片痳巖原巖主要為火成巖,屬高鉀鈣堿性繫列,且金礦石一般都明顯貧鈉而富鉀、富鈣,SiO 2含量普遍較高,Au 品位隨 SiO 2的含量增高而呈正相關變化；(2)微量元素特徵錶明礦石樣品以Rb、Ta、Ti 等元素彊烈虧損,Ba、Sm 和 Y 元素彊烈虧損為特徵,與太華群片痳巖和熊耳群安山巖的標準化分佈麯線型式接近,說明金礦化可能與太華群片痳巖和(或)熊耳群安山巖具有成因上的聯繫；(3)稀土元素特徵錶明多數金礦石的輕稀土略虧損、重稀土略富集,弱負銪異常與礦區齣露的各類巖石的稀土元素標準化分佈麯線(右傾型)不同,而具深源特性；箇彆金礦石的標準化麯線形態一定程度上具片痳巖或(和)安山巖的特徵,呈弱負銪異常的右傾形態,暗示瞭太華群片痳巖和(或)熊耳群安山巖也貢獻瞭部分成礦物質。
통과연구황구금광상중암석지구화학특정,종이탐토태화군지층대우해구금광상성광적작용。연구표명(1)본구적편마암원암주요위화성암,속고갑개감성계렬,차금광석일반도명현빈납이부갑、부개,SiO 2함량보편교고,Au 품위수 SiO 2적함량증고이정정상관변화；(2)미량원소특정표명광석양품이Rb、Ta、Ti 등원소강렬우손,Ba、Sm 화 Y 원소강렬우손위특정,여태화군편마암화웅이군안산암적표준화분포곡선형식접근,설명금광화가능여태화군편마암화(혹)웅이군안산암구유성인상적련계；(3)희토원소특정표명다수금광석적경희토략우손、중희토략부집,약부유이상여광구출로적각류암석적희토원소표준화분포곡선(우경형)불동,이구심원특성；개별금광석적표준화곡선형태일정정도상구편마암혹(화)안산암적특정,정약부유이상적우경형태,암시료태화군편마암화(혹)웅이군안산암야공헌료부분성광물질。
This paper studied geochemical characteristics of Huanggou gold deposit and elaborated on the effect of Taihua formation on mineralization of gold deposits in this area.The result suggested that(1 )the protolith of gneiss was igneous and fell in high-k calc-alkaline series,and gold ores were pervasively charac-terized by Na-poorness and K-Ca-richness and high grade of SiO 2 content,while the grade of Au was positive-ly correlated to content of SiO 2 ;(2)the trace element characteristics suggested sever edepletion of elements like Rb,Ta,Ti,Ba,Sm and Y in the ore samples,and the similar normalized pattern with gneiss of Taihua Group and andesite of Xiong'er Group suggested that Au mineralization was possibly associated with gneiss and andesite in terms of genesis;(3)the rare earth element characteristics suggested slight depletion of light rare earth and slight enrichment of heavy rare earth in most of the gold ores.Weak negative Eu anomaly was quite different from the normalized pattern of various out cropped rocks and rare earth elements in this area (right declined),yet was derived from deep part.The normalized pattern of some gold ore was to some ex-tent similar with gneiss or (and)andesite and had the right declined weak negative Eu anomaly pattern,and it suggested that the genesis of Taihua Group and (or)andesite of Xiong’er Group contributed some ore-form-ing substances to the mineralization.
