地质通报
地質通報
지질통보
GEOLOGICAL BULLETIN OF CHINA
2014年
10期
1562-1570
,共9页
赵禹%赵玉岩%郝立波%陆继龙%赵新运
趙禹%趙玉巖%郝立波%陸繼龍%趙新運
조우%조옥암%학립파%륙계룡%조신운
紫金山矿床%成矿流体%稀土元素%微量元素%找矿预测模型
紫金山礦床%成礦流體%稀土元素%微量元素%找礦預測模型
자금산광상%성광류체%희토원소%미량원소%조광예측모형
Zijinshan deposit%ore-forming fluids%REE%trace elements%ore-prospecting prognostic model
成矿流体来源及性质是确定岩浆热液矿床找矿方向、建立找矿预测模型的重要依据。通过对紫金山铜金矿区内主要岩体岩石、典型矿石的对比分析,发现矿石与花岗闪长斑岩稀土元素特征相似,且花岗闪长斑岩岩体的形成年龄与成矿时间极为接近,可以为成矿流体提供足够的热量,因此推断该矿床的成矿流体最初来源于深部隐伏花岗闪长斑岩岩体分异的岩浆热液。矿石中富集Th、Nb、Ta、Zr、Hf等高场强元素和轻稀土元素,Hf/Sm值和Nb/La值都大于1,表明成矿流体具有F含量多于Cl的性质。结合前人大量的研究资料,建立了二庙沟-中寮剖面找矿预测模型。
成礦流體來源及性質是確定巖漿熱液礦床找礦方嚮、建立找礦預測模型的重要依據。通過對紫金山銅金礦區內主要巖體巖石、典型礦石的對比分析,髮現礦石與花崗閃長斑巖稀土元素特徵相似,且花崗閃長斑巖巖體的形成年齡與成礦時間極為接近,可以為成礦流體提供足夠的熱量,因此推斷該礦床的成礦流體最初來源于深部隱伏花崗閃長斑巖巖體分異的巖漿熱液。礦石中富集Th、Nb、Ta、Zr、Hf等高場彊元素和輕稀土元素,Hf/Sm值和Nb/La值都大于1,錶明成礦流體具有F含量多于Cl的性質。結閤前人大量的研究資料,建立瞭二廟溝-中寮剖麵找礦預測模型。
성광류체래원급성질시학정암장열액광상조광방향、건립조광예측모형적중요의거。통과대자금산동금광구내주요암체암석、전형광석적대비분석,발현광석여화강섬장반암희토원소특정상사,차화강섬장반암암체적형성년령여성광시간겁위접근,가이위성광류체제공족구적열량,인차추단해광상적성광류체최초래원우심부은복화강섬장반암암체분이적암장열액。광석중부집Th、Nb、Ta、Zr、Hf등고장강원소화경희토원소,Hf/Sm치화Nb/La치도대우1,표명성광류체구유F함량다우Cl적성질。결합전인대량적연구자료,건립료이묘구-중료부면조광예측모형。
The source and nature of ore-forming fluids constitute an important basis for determining prospecting orientation and es-tablishing the model of prospecting prediction for magmatic hydrothermal deposits. The authors have found that ores and granodio-rite-porphyry are similar to each other in REE characteristics, as shown by a comparative analysis of major plutons and typical ores, and that the formation age of granodiorite-porphyry pluton is so closed to metallogenic time, thus the pluton could provide enough heat for the ore-forming fluids. It is thus inferred that magmatic hydrothermal fluids were derived from deep concealed granodiorite-porphyry pluton, which served as the original source of ore-forming fluids. The high field strength elements (HFSE) (Th, Nb, Ta, Zr, Hf, etc.) of ores are relatively high with enrichment of LREE, and HFSE/LREE ratios (Hf/Sm, Nb/La) are higher than 1, sug-gesting that F is richer than Cl in ore-forming fluids. On such a basis and in combination with a lot of previous researches, the au-thors have established a model for ore-prospecting prognosis along Ermiaogou-Zhongliao section.