本文選題：舊房梁　切入點：微量元素　出處：《地質(zhì)科技情報》2017年02期 　論文類型：期刊論文

【摘要】：選取一個含金采樣剖面,對舊房梁金礦床的成礦流體性質(zhì)和成礦物質(zhì)來源進(jìn)行了探討。研究結(jié)果表明,舊房梁金礦床產(chǎn)于陜西勉略寧三角地區(qū)中新元古界碧口群,礦體的分布和產(chǎn)狀受地層巖性和韌性剪切帶的強(qiáng)烈控制,礦床成因類型為綠巖型金礦床。對礦石及其頂?shù)装鍑鷰r的主微量元素和稀土元素地球化學(xué)特征及其成礦作用的研究表明:與Au含量正相關(guān)性較好的元素有Ag、Hg、Bi、Mo;在成礦過程中,礦石和圍巖的Al_2O_3、TFe_2O_3及高場強(qiáng)元素含量較穩(wěn)定;大離子親石元素含量在礦石及礦體底板圍巖中相對虧損,在礦體頂板圍巖中富集;親硫元素含量表現(xiàn)較為復(fù)雜,Pb含量在礦體頂板圍巖及氧化礦石中富集,Mo、Hg含量在礦石中普遍升高;同時伴隨巖石質(zhì)量的虧損;稀土元素配分模式顯示礦石及近礦圍巖相對于遠(yuǎn)礦圍巖具有正Ce異常和負(fù)Eu異常的特征。上述特征均表明成礦流體具有高溫還原性的特點。結(jié)合礦床流體包裹體和硫同位素等特征,認(rèn)為該礦床的成礦物質(zhì)來源可能與碧口群地層有關(guān),其成礦過程可能與澄江期在區(qū)內(nèi)廣泛形成的NNE向韌性剪切變形有關(guān),構(gòu)造礦化蝕變對圍巖物質(zhì)組分具一定繼承性和差異性。
[Abstract]:A gold bearing sampling section is selected to study the ore-forming fluid properties and the source of ore-forming materials of the old Fangliang gold deposit. The results show that the Jiufang Liangliang gold deposit occurred in the Bikou Group of the Neoproterozoic in the Mianliuning Triangle area, Shaanxi Province. The distribution and occurrence of orebodies are strongly controlled by stratigraphic lithology and ductile shear zones. The origin of the deposit is greenstone type gold deposit. The geochemical characteristics and mineralization of main trace elements and rare earth elements in ore and its surrounding rock of roof and bottom plate are studied. The contents of Al _ 2O _ 3T _ Fe _ 2O _ 3 and high field strength elements in ore and surrounding rock are relatively stable, and the content of large ion lithophile elements is relatively depleted in the rock mass of ore and orebody floor, and is enriched in the surrounding rock of orebody roof. The content of sulfur-lipophilic elements shows that the content of Pb is more complex and the content of Mo-HG is generally increased in the roof surrounding rock and oxidized ore with the loss of rock quality. The REE distribution model shows that the ore and the surrounding rock near the ore have the characteristics of positive ce anomaly and negative EU anomaly compared with those of the distant ore surrounding rock. The above characteristics indicate that the ore-forming fluid has the characteristics of high temperature reduction. Combined with the fluid inclusions of the ore deposit, the ore-forming fluid inclusions have the characteristics of high temperature reduction. And sulfur isotopes, It is considered that the ore-forming source of the deposit may be related to the formation of Bikou Group, and the metallogenic process may be related to the NNE ductile shear deformation formed widely in the area in Chengjiang period. The structural mineralization alteration has certain inheritance and difference to the material composition of surrounding rock.
【作者單位】： 國家海洋局第二海洋研究所國家海洋局海底科學(xué)重點實驗室;中國地質(zhì)大學(xué)(武漢)地質(zhì)過程與礦產(chǎn)資源國家重點實驗室;中國地質(zhì)大學(xué)(武漢)資源學(xué)院;
【基金】：陜西省地質(zhì)礦產(chǎn)勘查開發(fā)局地質(zhì)勘查及科研專項基金項目(陜地財發(fā)[2009]34號)
【分類號】：P618.51

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本文編號：1608414