华南地质与矿产
華南地質與礦產
화남지질여광산
GEOLOGY AND MINERAL RESOURCES OF SOUTH CHINA
2014年
2期
88-98
,共11页
李巍%韦有福%廖开立%杨振
李巍%韋有福%廖開立%楊振
리외%위유복%료개립%양진
花岗斑岩%地球化学%成岩成矿作用%宝山斑岩铜矿床%大瑶山
花崗斑巖%地毬化學%成巖成礦作用%寶山斑巖銅礦床%大瑤山
화강반암%지구화학%성암성광작용%보산반암동광상%대요산
granite porphyry%diagenesis and mineralization%Baoshan porphyry-type Cu deposit%Dayaoshan
宝山铜矿床作为广西境内发现的首例隐伏斑岩型铜矿床，对于其研究尤为薄弱。本文通过对宝山斑岩铜矿床含矿花岗斑岩和矿石展开地球化学特征的研究，以查明岩矿石主微量元素特征、稀土元素特征等，探讨花岗斑岩与铜成矿作用之间的关系。其中，花岗斑岩主量元素显示，SiO2含量为73.94%~77.92%，K2O+Na2O含量为3.96%~8.51%，CaO含量为0.07%~1.49%，K2O/Na2O比值为0.25~35，可见岩体富硅富碱富钾贫钙；里特曼组合指数（δ）值为0.5~2.31，属于高钾钙碱性岩石。花岗斑岩的Al2O3含量为12.27%~13.65%，铝饱和指数A/CNK为1.01~2.41，为弱过铝到过铝质。6件花岗斑岩以富集大离子亲石元素Rb及部分高场强元素Ta、Nd、Sm、U、Th，亏损部分大离子亲石元素Ba、Sr及部分高场强元素Nb、Zr、Eu为特征，且Sr、Eu亏损明显，属于典型的低Ba-Sr花岗岩。宝山斑岩型铜矿石与宝山花岗斑岩体的配分图基本上保持一致，具有强烈负Eu异常，无明显Ce异常，LREE、HREE分馏均不明显，两者间也不存在明显的分馏的特点。这些特征表明宝山斑岩型铜成矿作用与宝山花岗斑岩体关系密切。
寶山銅礦床作為廣西境內髮現的首例隱伏斑巖型銅礦床，對于其研究尤為薄弱。本文通過對寶山斑巖銅礦床含礦花崗斑巖和礦石展開地毬化學特徵的研究，以查明巖礦石主微量元素特徵、稀土元素特徵等，探討花崗斑巖與銅成礦作用之間的關繫。其中，花崗斑巖主量元素顯示，SiO2含量為73.94%~77.92%，K2O+Na2O含量為3.96%~8.51%，CaO含量為0.07%~1.49%，K2O/Na2O比值為0.25~35，可見巖體富硅富堿富鉀貧鈣；裏特曼組閤指數（δ）值為0.5~2.31，屬于高鉀鈣堿性巖石。花崗斑巖的Al2O3含量為12.27%~13.65%，鋁飽和指數A/CNK為1.01~2.41，為弱過鋁到過鋁質。6件花崗斑巖以富集大離子親石元素Rb及部分高場彊元素Ta、Nd、Sm、U、Th，虧損部分大離子親石元素Ba、Sr及部分高場彊元素Nb、Zr、Eu為特徵，且Sr、Eu虧損明顯，屬于典型的低Ba-Sr花崗巖。寶山斑巖型銅礦石與寶山花崗斑巖體的配分圖基本上保持一緻，具有彊烈負Eu異常，無明顯Ce異常，LREE、HREE分餾均不明顯，兩者間也不存在明顯的分餾的特點。這些特徵錶明寶山斑巖型銅成礦作用與寶山花崗斑巖體關繫密切。
보산동광상작위엄서경내발현적수례은복반암형동광상，대우기연구우위박약。본문통과대보산반암동광상함광화강반암화광석전개지구화학특정적연구，이사명암광석주미량원소특정、희토원소특정등，탐토화강반암여동성광작용지간적관계。기중，화강반암주량원소현시，SiO2함량위73.94%~77.92%，K2O+Na2O함량위3.96%~8.51%，CaO함량위0.07%~1.49%，K2O/Na2O비치위0.25~35，가견암체부규부감부갑빈개；리특만조합지수（δ）치위0.5~2.31，속우고갑개감성암석。화강반암적Al2O3함량위12.27%~13.65%，려포화지수A/CNK위1.01~2.41，위약과려도과려질。6건화강반암이부집대리자친석원소Rb급부분고장강원소Ta、Nd、Sm、U、Th，우손부분대리자친석원소Ba、Sr급부분고장강원소Nb、Zr、Eu위특정，차Sr、Eu우손명현，속우전형적저Ba-Sr화강암。보산반암형동광석여보산화강반암체적배분도기본상보지일치，구유강렬부Eu이상，무명현Ce이상，LREE、HREE분류균불명현，량자간야불존재명현적분류적특점。저사특정표명보산반암형동성광작용여보산화강반암체관계밀절。
The Baoshan copper deposit is a porphyry-type Cu deposit newly discovered in the Dayaoshan region in recent years, and the relationship between the concealed granite porphyry and mineralization is a controversial. In this paper, we present the geochemical characteristics of granite porphyry and copper ore in the Baoshan Cu deposit, including the major and trace elements study. The granite porphyry exhibits high SiO2 (73.94% ~77.92%), high K2O+Na2O (3.96%~8.51%), high Al2O3 (12.27%~13.65%) and low CaO (0.07%~1.49%), and belong chemically to high-potassium calc-alkaline and show the weak peraluminous to peraluminous. More-over, the granite porphyry is enriched in Rb and some high field strength elements (HFSEs), such as Ta, Nd, Sm, U, and Th, and depleted in Ba, Sr and Nb, Zr and Eu, is a typical low- Ba-Sr granites. Normalized REE patterns of the granite porphyry and copper ore is basically consistence, with a strong negative Eu anomaly, no significant Ce anomalies, little LREE and HREE fractionation. These characteristics suggest that the porphyry copper miner-alization have a closely relationship with the granite porphyry.
