迤纳厂稀土铁铜矿床稀土元素地球化学

系统测定了迤纳厂矿床不同类型矿石、围岩和火山角砾岩、岩浆岩的稀土元素组成。研究表明,不同类型矿石均具REE总量高(726X10^6—4633x10^6)、铕正异常(1．邱一5．16)、轻稀土强烈富集[(La／Yb)n=3．98—81．1]等特征,Y／Ho比值(24．4)小于球粒陨石中比值(28),与黑烟囱的比值接近。硅质白云岩及钠长石英斑岩、层状火山角砾岩的稀土特征(稀土总量低,铕负异常,轻重稀土分异不明显等)与矿石完全不同。成矿流体的稀土元素特征与现代大洋中脊热液相似,与裂谷初期的碱性火山岩稀土元素特征较为接近。结合矿床产出的大地构造背景,提出迤纳厂稀土铁铜矿床可能为昆阳裂谷初期碱性火山岩的喷发期间歇,来自地幔富稀土、富挥发份的成矿流体喷流．沉积成矿。     

反转构造的识别及其地质意义

反转构造是构造地质学目前研究的热点之一,它是—种重要的叠加构造样式,与油气的生成、运移和聚集有着密切的关系,因而受到石油地质学家的高度重视。从几何学、运动学等角度对反转构造进行研究,认为不同性质和规模的构造反转,其发育规律、展布形式均不同,并对油气的运移和富集有重要作用。     

湘黔下寒武统黑色岩系不同矿物组合中的铂族元素特征

贵州遵义和湖南张家界黑色岩系中的矿物组合非常复杂,用X射线衍射仪分析并结合前人的研究成果,显示其中的硫化物矿物、粘土矿物和有机质含量较高;经破碎和分选流程对样品进行处理后,用ICP-MS方法测定了黑色页岩和分选后样品中的铂族元素含量,对贵州遵义和湖南张家界黑色岩系中的铂族元素赋存特征进行研究,结果表明:贵州遵义和湖南张家界的黑色页岩系中赋存高含量的铂族元素,且含量表现较高的稳定性;低温氧化条件下,铂族元素的化学活动性足以使之以相当规模活化、迁移并在还原条件下沉淀富集;经强风化淋滤作用,富含碳硫钼矿黑色页岩中铂族各元素含量都有不同程度的降低;绝大部分的铂族元素富集于黑色页岩的有机质和黄铁矿中;铂族元素的分布模式具规律性,铂族元素的明显分异说明此黑色页岩的分布模式不具有地外物质的特征。     

电解浓缩-液闪仪计数法分析天然水中氚含量的影响因素

文章对在电解浓缩液闪计数法分析天然水中氚含量的复杂分析系统中,蒸馏、称重、电解、计数等每一过程中的影响因素进行了分析讨论。     

深海沉积物中碲异常的成因

碲在地球上是一种稀有分散元素，碲在地壳中的丰度很低，仅为1.0ng/g；但碲在富钴结壳、海底多金属结核、党海沉积物和陨石中的丰度异常高。为了查明深海沉积物中碲异常的原因，笔者对比分析了深海沉积物中磁性部分与全岩的碲含量和氦同位素组成。结果显示磁性部分的He含量和3He/4He比值及Te含量较全岩的值明显偏高；3He含量与Te含量同步变化；在3He－Te关系图上，二者具明显的正相关关系。本文首次提出深海沉积物中的碲异常与氦同位素异常一样可能是由宇宙尘注入引起的；海底多金属结核和富钴结壳中的碲异常可能也与宇尘有关。     

东天山马头滩金矿成矿地质特征

东天山马头滩金矿为一中型富金矿床,通过对该矿床区域地质背景、矿区地质特征、矿体产出形态、围岩蚀变、成矿阶段、成矿物理化学条件以及控矿因素及金的富集规律研究,为新疆寻找该类型金矿提供了依据.     

黔西南吴家寨金矿成矿地质条件及富集规律探讨

简要介绍了黔西南吴家寨金矿地质特征，通过对其地质背景、成矿地质条件的认识和分析，对矿体矿化的富集规律进行研究，指出其为红土型金矿，对该矿区及外围找矿，扩大矿产资源，发展地方经济，具有参考意义。     

Anthropogenic heavy metal signatures for the fast growing urban area of Natal (NE-Brazil)

In this study the effect of anthropogenic discharges on the heavy metal content in the Potengi–Jundiai river system near the fast growing city of Natal, NE-Brazil, is investigated. Due to the multiple anthropogenic source character without any predominating anthropogenic heavy metal discharge the area of Natal may serve as a characteristic place for the study of the impact of the fast growing Brazilian cities on the environment. In general the sediments of the Rio Potengi–Jundiai river system in the studied area are not severely polluted. However, close to waste water drain pipes a characteristic anthropogenic heavy metal signature is visible in enhanced Zn, Pb, Cu and Cd values relative to reference elements such as Al and Fe. Sources are domestic and animal waste, combustion products and hydrocarbons. These heavy metals are probably mainly bound to organic matter. The elements Sn, Hg and Ag in part also belong to the anthropogenic heavy metal signature. The elements Cr, Ni and V are characteristic of weathering heavy minerals in crystalline rocks exposed in the catchment area of the river system and are not significantly added from anthropogenic sources. These heavy metals are most likely predominantly bound to oxides and represent the pristine geogenic background of the system. They can thus be used as reference elements to monitor incipient accumulation of Zn, Pb, Cu and Cd due to anthropogenic input. The element characteristics found here match with those found in other fast growing urban areas such as the Sao Paulo metropolitan area.     

陕西山阳中村钒矿地质特征及富集规律

陕西山阳中村钒矿带东自丹凤县竹林关石槽沟,西至山阳县洛峪乡苏峪沟,全长30km,南北宽50~100m,预计V2O5总储量约为297万t。中村钒矿位于该钒矿带中西部,为一个典型的沉积型矿床,其矿体主要产于寒武系水沟口组中,矿体呈现厚度大,延伸长,分布较为均匀的特点。钒矿床的富集规律与钒矿床的成因有较大关系,钒元素的赋存状态多以类质同像形式存在于黏土类矿物中。     

A preliminary discussion on the bio-metallogenesis of Tl deposits in the low-temperature minerogenetic province of southwestern China

Starting with the research status of bio-metallogenesis of Tl deposits and their geology, this work deals with the geological background of Tl enrichment and mineralization and the mechanism of bio- metal-logenesis of Tl deposits, as exemplified by Tl deposits in the low-temperature minerogenetic province. This research on the bio-metallogenesis of Tl deposits is focused on the correlations between bio-enrichment and Tl, the enrichment of Tl in micro-paleo-animals in rocks and ores, bio-fossil casts in Tl-rich ores, the involvement of bio-sulfur in minerogenesis and the enrichment of bio-genetic organic carbon in Tl ores. Thallium deposits have experienced two ore-forming stages: syngenetic bio- en-richment and epigenetic hydrothermal reworking (or transformation). Owing to the intense epigenetic hydrothermal reworking, almost no bio-residues remain in syngenetically bio-enriched Tl ores, thereby the Tl deposits display the characteristics of hydrothermally reoworked deposits.