CAJ | 학술논문

新生矿区花岗岩体岩性为黑云母花岗岩和黑云母二长花岗岩。花岗岩总体上具有富钾、高硅的特征，为钙碱性到弱过铝质花岗岩的过渡(A/CNK为0.93~1.13)。花岗岩具有强烈的Eu负异常(δEu为0.15~0.35)，稀土元素配分曲线呈不对称的“海鸥型”，与典型过铝质A型花岗岩的特征一致。花岗岩的10000Ga/Al为3.62(3.47~4.00)，与世界A型花岗岩平均值3.75相接近。锆石U-Pb年龄为(147.5±3.5) Ma(MSWD=2.6)，显示岩体形成于燕山早期第二阶段。锆石的εHf(t)为-5.79~-4.15，暗示岩浆来源于均一源区，锆石的Hf同位素两阶段模式年龄(TDM2)为1.208~1.290 Ga，平均为1.227 Ga，说明岩浆源区有中元古代的古老地壳物质的加入。花岗岩构造环境判别图解显示为造山后(A2)的板内花岗岩。成矿花岗岩是在燕山早期晚阶段板内拉张背景下侵入地壳，并带来成矿物质形成矽卡型铜多金属矿床。
신생광구화강암체암성위흑운모화강암화흑운모이장화강암。화강암총체상구유부갑、고규적특정，위개감성도약과려질화강암적과도(A/CNK위0.93~1.13)。화강암구유강렬적Eu부이상(δEu위0.15~0.35)，희토원소배분곡선정불대칭적“해구형”，여전형과려질A형화강암적특정일치。화강암적10000Ga/Al위3.62(3.47~4.00)，여세계A형화강암평균치3.75상접근。고석U-Pb년령위(147.5±3.5) Ma(MSWD=2.6)，현시암체형성우연산조기제이계단。고석적εHf(t)위-5.79~-4.15，암시암장래원우균일원구，고석적Hf동위소량계단모식년령(TDM2)위1.208~1.290 Ga，평균위1.227 Ga，설명암장원구유중원고대적고로지각물질적가입。화강암구조배경판별도해현시위조산후(A2)적판내화강암。성광화강암시재연산조기만계단판내랍장배경하침입지각，병대래성광물질형성석잡형동다금속광상。
The Xinsheng granite bodies are distinguished as biotite granite and biotite monzogranite in mining area, the granites can be classified to be calc-alkaline granite and weakly peraluminous granite with K-rich, Si-high (the values of A/CNK are 0.93-1.13). The granites have obvious Eu negative anomaly, the REE distribution patterns be long to the type of “gull”, which are the same as that of typical A-type granite. The average value of 10 000Ga/Al of granites is 3.62 (3.47-4.00), which is close to 3.75, the average value of A-type granite worldwide. The zircon U-Pb age of granite bodies is (147.5±3.5) Ma (MSWD=2.6), which shows that they formed in the second stage of early Yanshan movement. The values ofεHf(t) are-5.79--4.15, indicating that the magma mainly derived from a uniform resource. The model ages of two-stage range of zircon Hf isotope (TDM2) are 1.208-1.290 Ga (average value is 1.227 Ga). This feature indicates that the granite bodies originated from melting of early crustal materials formed in mesoproterozoic. The discrimination diagrams for tectonic background of granites prove that the granites formed in intra-plate extension environment, and the granites are A2-type, so, the granite body intrusived to lower crust in extension environment, and brought enough mineralizing material to form skarn type copper polymetallic deposit.