CAJ | 학술논문

从矿床地球化学特征入手,对下金宝矿体矿石、矿体围岩的常量元素、稀土元素和微量元素特征进行探讨。结果表明：下金宝岩体的花岗斑岩类岩石属于硅酸过饱和类钙碱性过铝质岩石,属于 A 型花岗岩,且 K、Nd、Hf、Th、Rb 相对富集,而亏损 Ta、Nb、Sr 和 Ti,说明其岩浆并非单纯来源于上地幔,在岩浆上升过程可能受到了地壳物质的混染；结合下金宝金矿床的控矿因素、蚀变分带特征、岩体地球化学特征、矿石结构构造、围岩蚀变、成矿温度,得出斑岩体是区内成矿的必要因素,下金宝金矿床应是以次火山热液作用为主的斑岩型金矿床。
종광상지구화학특정입수,대하금보광체광석、광체위암적상량원소、희토원소화미량원소특정진행탐토。결과표명：하금보암체적화강반암류암석속우규산과포화류개감성과려질암석,속우 A 형화강암,차 K、Nd、Hf、Th、Rb 상대부집,이우손 Ta、Nb、Sr 화 Ti,설명기암장병비단순래원우상지만,재암장상승과정가능수도료지각물질적혼염；결합하금보금광상적공광인소、식변분대특정、암체지구화학특정、광석결구구조、위암식변、성광온도,득출반암체시구내성광적필요인소,하금보금광상응시이차화산열액작용위주적반암형금광상。
Starting with the geochemical characteristics of the deposit,this paper conducted research on mac-roelements,REEs and trace elements of ore-bodies and wall rocks of Xiajinbao deposit.The study shows that granite porphyry type rocks in Xiajinbao rock mass are silicate supersaturated,peraluminous and calc-al-kali rocks,which fall into the category of a type granite.Elements like K,Nd,Hf,Th and Rb are relatively enriched while elements like Ta,Nb,Sr and Ti are relatively depleted.It indicates that the magma may not merely derive from the upper mantle and it may be contaminated by crustal materials in the process of the magma ascension.Based on ore-controlling factors,alteration zoning characteristics,geochemical character-istics of rock mass,texture and structure of ores,wall rock alteration,ore-forming temperature of Xiajinbao Au deposit,it is concluded that porphyry rock mass is a necessary factor of the mineralization,and Xiajinbao Au deposit is a porphyry type Au deposit related to subvolcanic hydrothermal processes.