| 甘肃白银厂铜多金属矿田折腰山矿床含铁硅质岩地球化学特征及其找矿意义 |
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| 引用本文： | 杜泽忠,;叶天竺,;庞振山,;吕志成,;梁婉娟,;甄世军,;张志辉,;李永胜,;甄世民.甘肃白银厂铜多金属矿田折腰山矿床含铁硅质岩地球化学特征及其找矿意义[J].中国区域地质,2014(6):924-932. |
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| 作者姓名： | 杜泽忠 ;叶天竺 ;庞振山 ;吕志成 ;梁婉娟 ;甄世军 ;张志辉 ;李永胜 ;甄世民 |
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| 作者单位： | [1]中国地质大学地球科学与资源学院,北京100083; [2]国土资源部矿产勘查技术指导中心,北京100120; [3]中国地质调查局发展研究中心,北京100037 |
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| 基金项目： | 资助项目：中国地质调查局老矿山找矿技术创新与示范项目（编号：1212011220737）致谢：野外工作期间得到甘肃白银有色集团股份有限公司科技发展处汪友元处长、马冀清处长和甘肃省有色地质勘查局白银矿产勘查院方春家总工程师、周科慧高级工程师、王靖工程师、南秀斌工程师、董琦旭工程师、徐种工程师的大力帮助;数据测试过程中得到天津地质调查中心郝国杰和韩伟老师的帮助;成文期间也得到了课题组同仁的帮助,审稿老师提出了宝贵的修改意见和建议,在此一并表示感谢. |
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| 摘 要： | 折腰山矿区含铁硅质岩赋存于含矿岩系与上部岩系间的沉积间断界面。含铁硅质岩矿物主要由细晶石英和赤铁矿组成，二者含量占90%以上，含少量的绢云母、钠长石、绿泥石等。该含铁硅质岩具有低的TiO2、A12O3和高的成矿元素（Fe、Cu、Pb、Zn）含量特征。Al/（Al＋Fe＋Mn）值具有热水沉积岩特征。在Fe-Mn-Al三角图解、Fe-Mn-（Cu＋Co＋Ni）×10三角图解和Zr-Cr图解中，该区含铁硅质岩均落在热水沉积岩区域中，含铁硅质岩的稀土元素总量很低，其北美页岩标准化配分模式为右倾曲线，具有弱的负Eu异常或正Eu异常和负Ce异常。部分样品MnO/TiO2值偏小，U/Th值偏大，Al2O3含量较高，出现负Eu异常，表明该矿区含铁硅质岩也有正常沉积硅质岩成分的加入。结合含铁硅质岩的地质产状、含矿岩系（石英角斑质凝灰岩）和含矿石英的稀土元素特征，认为含铁硅质岩的物源主要为石英角斑质凝灰岩，属于与火山作用有关的非生物成因类型，是该铜多金属矿田重要的找矿标志。
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| 关 键 词： | 含铁硅质岩 地球化学特征 铜多金属矿田 折腰山矿床 甘肃白银厂 |
Geochemical characteristics of ferrif-erous silicalites in the Zheyaoshan deposit of the Baiyinchang copper polymetallic orefield in Gansu Province and their ore-prospecting significance |
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| Institution: | DU Ze-zhong, YE Tian-zhu, PANG Zhen-shan, L Zhi-cheng, LIANG Wan-juan, ZHEN Shi-jun, ZHANG Zhi-hui, LI Yong-sheng, ZHEN Shi-min( 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 2. Technical Guidance Center for Mineral Resources Exploration, Ministry of Land and Resources, Beijing 100120, China; 3. Development and Research Center, China Geological Survey, Beijing 100037, China) |
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| Abstract: | The ferriferous silicalites in the Zheyaoshan ore district occur in sedimentary discontinuity interface between the ore-bear-ing rock series （quartz keratophyre taff） and the upper rock system, and are composed mainly of fine-crystalline quartz and hematite, which account for more than 90%, with a small amount of silk mica, feldspar, sodium chlorite etc. The ferriferous silicalites are charac-terized by low TiO2 and A12O3 as well as high ore-forming elements （Fe, Cu, Pb, Zn）. Through the calculation of Al/（Al＋Fe＋Mn） ratio, the characteristics of hydrothermal sedimentary rock were displayed. In the Fe-Mn-Al triangular diagram, Fe-Mn-（Cu＋Co＋Ni）×10 triangular diagram and Zr-Cr diagram, the ferriferous silicalites in this area are located in the hydrothermal sedimentary rock area, the total REE of ferriferous silicalites is very low, and the north American shale standardization distribution pattern is a right-oblique curve with weak negative Eu anomaly or positive Eu anomaly as well as weak negative Ce anomaly. The ω（MnO）/ω（TiO2） ratio of part of the samples is somewhat smaller, U/Th ratio is larger, Al2O3 content is higher, with a negative Eu anomaly, in-dicating that the addition of normal sedimentary silicalite ingredients. Combined with the geological background of ferriferous sili-calites and rare earth elements of ore-bearing rock series （quartz keratophyre tuff） and mineralized quartz, the authors hold that the provenance of ferriferous silicalites was mainly derived from quartz keratophyre tuff and belonged to the abiogenic type related to vol-canism, and this can be regarded as an important prospecting criterion in the orefield. |
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| Keywords: | ferriferous silicalite geochemical characteristics copper polymetallic orefield Zheyaoshan deposit Baiyinchang in Gansu |
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