青海省小圆山铁多金属矿区矿床地质特征及找矿方向

发布时间：2018-08-17 18:34

【摘要】：小圆山铁多金属矿区位于青海省重要的铁多金属成矿带——祁漫塔格蛇绿岩混杂岩带内。该区铁多金属矿勘查已圈定了多处与铁多金属矿化关系密切的磁异常,显示出该地区具有较强的成矿潜力。分析了区域成矿地质背景及矿区地质特征,并讨论了矿床地质特征及控矿因素,研究表明:(1)小圆山地区金水口岩群白沙河岩组(Pt1b)富含W、Sn、Cu等成矿元素,奥陶系—志留系滩间山群等地层中存在碳酸盐岩,为小圆山铁多金属矿床赋存提供了有利的围岩条件;(2)区内发现磁异常17处,总体呈NWW向分布,显示出构造对矿床的控制作用;(3)区内铁多金属矿床多分布于中—酸性侵入岩与围岩的接触带,晚华力西期—印支期及燕山期侵入岩岩体控制了造山型矿床的分布,区内铁矿体厚度0.90~5.91 m,TFe品位21.85%~44.34%,铅锌矿化体厚度0.10~5.45 m,Zn品位0.79%~13.60%,Pb品位0.63%~6.88%,具有较好的找矿前景;(4)小圆山铁多金属矿床成因为典型的与酸性岩浆有关的矽卡岩型矿床,受控于特定的碳酸盐岩容矿岩石、断裂构造部位和岩浆热液活动。在上述分析的基础上,进一步分析认为:地磁异常区和水系沉积物元素异常叠合区,奥陶系—志留系滩间山群、石炭系石拐子组,大断裂及其附近破碎带、岩浆岩侵入带等构造部位为矿区重要的找矿部位,值得进一步开展工作。
[Abstract]:The Xiaoyuanshan iron polymetallic ore area is located in the Qimantage ophiolite melange belt, an important iron-polymetallic metallogenic belt in Qinghai Province. The exploration of iron polymetallic deposits in this area has delineated many magnetic anomalies closely related to iron and polymetallic mineralization, which shows that the area has strong metallogenic potential. The regional metallogenic geological background and mining area geological characteristics are analyzed, and the geological characteristics and ore-controlling factors of the deposit are discussed. The results show that: (1) the Baishaheyan formation (Pt1b) of the Jinshuikou rock group in Xiaoyuanshan area is rich in ore-forming elements such as WSn-Sn-Cu, etc. Carbonate rocks exist in Ordovician-Silurian Tan-Jianshan Group, which provides favorable surrounding rock conditions for the occurrence of the Xiaoyuan Mountain Iron Polymetallic Deposit. (2) 17 magnetic anomalies were found in the area, which generally distributed in the NWW direction. (3) the iron polymetallic deposits are distributed in the contact zone between intermediate-acid intrusive rocks and surrounding rocks, and the late Variscan Indosinian and Yanshanian intrusive rock masses control the distribution of orogenic deposits. In this area, the thickness of iron ore body is 0.90 ~ 5.91 m ~ (-1) TFE grade 21.85 ~ 44.34, the thickness of lead and zinc orebody is 0.10 ~ 5.45 m ~ (-1) Zn grade 0.79 and 0.79% ~ (13. 60) Pb grade 0.63 ~ 6.88, which has a good prospecting prospect. (4) the Xiaoyuanshan iron polymetallic deposit is a typical skarn deposit related to acid magma. Controlled by specific carbonate rock, fault structure and magmatic hydrothermal activity. On the basis of the above analysis, it is further considered that the geomagnetic anomaly area and the sediment element anomaly superposition area of the drainage system, the Ordovician Silurian Tanjianshan Group, the Carboniferous Shihuizi formation, the great faults and their adjacent fracture zones, The magmatic intrusive zone is an important ore-prospecting site in the mining area, which is worthy of further work.
【作者单位】：青海省核工业地质局;南华大学环境保护与安全工程学院;青海省柴达木综合地质矿产勘查院;
【基金】：南华大学科研启动基金项目(编号:2014XQ11)
【分类号】：P618.2

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