摘要
为进一步在青海白日其利金矿高效开展深部找矿预测工作,结合相关地质工作成果,运用幔枝构造成矿理论分析了区域幔枝构造特征、矿区幔枝构造特征及矿床地质特征,并进一步讨论了幔枝成矿控矿因素、矿床成因及成矿模式。研究表明:(1)矿区已圈定的矿体及矿化带均产于1∶25 000水系沉积物HW4异常和1∶10 000激电中梯高极化低阻异常中,矿体均赋存于次级拆离滑脱断层及其次级断裂构造中,赋矿岩性为具有强烈黄铁矿化、硅化、绿泥石化的脆—韧性剪切动力变质岩;(2)区内核部岩浆杂岩、核部变质杂岩、拆离滑脱断裂及韧性剪切带为主要的控矿因素,受印支期变质核杂岩构造控制,核部变质杂岩并非矿源层,金矿质来源于深部,随幔枝构造向上运移,在韧—脆性次级拆离滑脱断裂及其次级断裂构造中成矿,属构造蚀变岩型金矿,为典型的幔枝构造核部岩浆-变质杂岩成矿区,具有幔枝构造成矿模式;(3)核部岩浆杂岩、变质杂岩、拆离滑脱断裂、韧性剪切带、矿化蚀变及物化探异常为重要的找矿标志。在上述分析的基础上,进行了成矿预测,认为区内核部岩浆杂岩、变质杂岩、拆离滑脱断裂带、韧性剪切带、矿化带和矿化体及其深部复合金综合化探异常区为重要的成矿预测区和找矿方向。
In order to conduct the deep prospecting prediction work in Bairiqili gold deposit effectively, combing with some related geological working results of the area, the regional mantle branch structure characteristics, mantle branch structure characteristics of the mining area and the geological characteristics of the deposits, and the mantle branch metallogenic ore-controlling factors, deposit genesis and metallogenic pattern are also discussed in depth. The study results show that：（1）the ore-bodies and miner- alized belts that are delineated in the mining area are occurred in 1：25 000 stream sediment HW4 anomaly and 1：10 000 IP high polarization and low resistance anomalies, the ore-bodies are hosted in secondary detachment decollement fault and its secondary fault structures, ore-bearing lithology is the brittle-ductile shear dynamic metamorphic rock with the alteration characteristics of pyritization, silicification and chloritization ; （2）the core magmatic complex rock, core metamorphic complex rock, detachment decollement fault and ductile shear zone are the main ore-controlling factors in the mining area, the core magmatic complex rocks is controlled by lndosinian metamorphic core complex rock structure, so, it is not gold ore source layer, the gold elements is derived from the deep, along with the mantle branch structure migration, the metallogenic of gold elements is conducted in brittle-ductile secondary detachment decollement fauh and its secondary fault structures, the gold deposit is belongs to tectonic alteration rock type gold deposits, the mining area is a typical mantle branch structure magmatic core metamorphic metallogenic zone and with mantle branch tectonic metallogenic patlern;（3）the core magmatic complex rock, metamorphic rock, detachment decollement fault,due＇tile shear zone,mineralization aheration and geophysical and geochemical anomalies are the important prospecting indicators. Based on the above analysis results,the metallogenie prognosis is conducted in the mining ar
出处
《现代矿业》
CAS
2017年第5期1-8,25,共9页
Modern Mining
基金
中央地质勘查基金项目(编号:2013087)
关键词
金矿
深部找矿
幔枝构造
控矿因素
矿床成因
成矿模式
成矿预测
Gold deposit,Deep prospecting, Mantle branch structure,Ore-controlling factor, Deposit genesis, Metallogenic pattern, Prospecting prognosis
