黑龙江省绥阳—道河地区阎王殿组地层沉积环境与含矿性研究

发布时间：2018-01-06 16:05

  本文关键词：黑龙江省绥阳—道河地区阎王殿组地层沉积环境与含矿性研究　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

  更多相关文章： 阎王殿组 变质岩 含矿性 沉积环境 黑龙江省 道河

【摘要】：研究区位于太平河金铜多金属成矿带,本次主要采用矿物学和岩石地球化学对阎王殿组地层进行研究,根据研究成果对该地层的地层组合、岩相特征、形成的构造环境、源区特征及其含矿性进行分析。阎王殿组地层岩石的颜色较暗,岩性主要为千枚岩、碳质板岩、云母石英片岩,整体上呈浅变质作用;研究区地层出露部位小褶曲等构造较多,多在碳质板岩和千枚岩层位,可为该地层元素的富集提供良好的场所。通过对该地层代表样品进行岩石的主量元素、微量元素、稀土元素分析,得出该地区岩石具高硅铝质、富钾贫钠特征;Cu/Zn范围为0.06-0.58之间,δCe1,说明水体富含Ce,岩石样品Ce亏损,沉积环境为弱氧化或者还原环境沉积环境,Ce呈现弱负异常,属于为正常浅海碎屑沉积。利用主量元素,通过判别公式对该地区的变质岩进行正副变质岩判别该地层的变质岩属于副变质岩,其原岩为沉积岩,结合样品的地球化学元素特征及其图解,样品多投在泥沙质沉积岩区,根据K-Rb图解,样品都投在中酸性源区,原岩主要为长英质物源区,其形成可能为中酸性火山质经过搬运风化,进行沉积,在此过程中有上地壳的古老沉积物加入;在不同构造环境判别图解中,绝大多数样品投影点落入活动大陆边缘区。地球化学特征表明,阎王殿组碎屑岩可能沉积于活动大陆边缘环境。阎王殿组从下往上,ICV值则呈递减趋势,体现了风化作用由弱到强,成分成熟度逐渐升高的特点,风化较为严重,根据其风化特征判断源区气候由寒冷、干燥、弱风化向温暖、湿润、中等风化演化。通过对该地层成矿元素Au、Ag、As、Sb、Pb、Bi、Hg、Zn、Cu进行分析,该地层成矿元素较为富集,金元素的富集系数达到15.72,其他元素也较为富集,Cu为亏损状态,可为该地区成矿提供有利的物质来源,可能为矿源层。
[Abstract]:The study area is located in Taiping River gold copper polymetallic metallogenic belt, this mainly adopts the mineralogy and geochemistry of Yanwangdian group formation, according to the research results on the formation of the strata, lithofacies characteristics, tectonic settings, analyze the source characteristics and ore Yanwangdian group. Rock color the main lithology is dark, carbonaceous slate, phyllite, mica quartz schist, whole is shallow metamorphic strata in the study area; exposed part of the small fold structure is more, more in the carbonaceous slate and phyllite stratum, can provide a good place for the formation of element enrichment. The main elements of the rock. The formation of representative samples of trace elements, rare earth elements analysis, the area of rock with high silicon aluminum, potassium sodium depleted characteristics; the Cu/Zn range is between 0.06-0.58, Delta Ce1, the water is rich in Ce, Ce sedimentary rock samples losses. The environment for weak oxidation or reduction environment of sedimentary environment, Ce has a weak negative anomaly, which belongs to the normal shallow sea sediment. The main elements in the area of metamorphic rocks, metamorphic rocks of the metamorphic rock formation and discrimination by discriminant formula belongs to metamorphic, the original rock is sedimentary rocks, geochemical characteristics and graphic elements combined with the sample the samples cast in sandy sedimentary area, according to the K-Rb diagram, the samples are cast in the acid in the source area, the original rock is mainly felsic provenance, its formation may be acidic volcano matter through the handling of weathering, deposition, in the process of ancient sediments of the upper crust in different join; tectonic discrimination diagrams, the vast majority of sample projection point into the active continental margin area. The geochemical characteristics indicate that Yanwangdian group clastic rocks can be deposited in an active continental margin environment. Yanwangdian group from down to up, I The CV value is decreased, reflecting the weathering characteristics from weak to strong, compositional maturity gradually increased, weathering serious, according to the judgment of source area weathering characteristics of climate from the cold, dry, weak weathering to warm, moist, moderately weathered evolution. Through the formation of ore-forming elements Au, Ag, As, Sb, Pb Bi, Hg, Zn, Cu, analysis of the formation of ore-forming elements are relatively enriched, gold element enrichment coefficient reached 15.72, other elements are enrichment, Cu loss, can provide the material source for the favorable metallogenic area, as the ore source bed.

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P536
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本文编号：1388564