黑龙江省大兴安岭古利库岩金矿床成矿物质来源分析

通过对古利库岩金矿床的岩石地球化学特征和H、O、S、Pb同位素特征的分析,认为:该矿床成矿热液来源于大气降水;热液硫来源于中生代火山岩;热液铅来源于基底落马湖群和与之相伴产出的花岗岩类;金、银的直接来源可能是遭受到韧性剪切变形的基底落马湖群和相伴产出的古利库河序列花岗岩类。     

个旧地区地球化学元素的多重分形特征及找矿预测

应用多重分形的“C-A”模型（即含量-面积）方法，对云南个旧地区的水系沉积物样品的20项元素进行了研究分析。结果表明，成矿元素以及伴生元素呈模式Ⅱ的高丛集多重分形分布，非成矿元素呈模式Ⅰ的简单连续多重分形分布；根据个旧地区东部与西部地球化学元素分布的对比发现，在东部的分维值鲁遍比西部小，有的成矿元素如Cu、Au在东西部呈现不同的分布模式，而非成矿元素分布变化不大。     

Quantification and characterization of condensed organic matter in sediments from the Pearl River Delta and Estuary, South China

Nonhydrolyzable carbon （NHC） and black carbon （BC） were measured upon treatments with the HCl/HF/trifluoroacetic acid method, and with the combustion method at 375 ℃, respectively in three contaminated soils from the urban area of Guangzhou and twenty-two bulk and size-fractionated sediments from the Pearl River Delta and Estuary, China. The isolated NHC and BC fractions were also characterized using elementary analysis, radiocarbon accelerated mass spectroscopy （AMS）, solid state ^13C cross-polarization and magic angle spinning unclear magnetic resonance spectroscopy （^13C-CP/MAS NMR）, Fourier transformed infrared spectroscopy （FTIR）, and Raman microspectrometry. The results showed that the NHC and BC accounted for 25.6%-84.7 % and 4.14%-17.3%, respectively, of the total organic carbon （OC） with averages of 51.9% and 11.2% in the soils and sediments. For the less contaminated, low OC fiver and estuary sediments （WR and C08）, the OC and NHC concentrations increased with decreasing particle size.     

Phosphorus forms and bioavailability of lake sediments in the middle and lower reaches of Yangtze River

Forms of phosphorus in sediments from 25 lakes in the middle and lower reaches of Yangtze River were analyzed by the sequential extraction procedure. Contents and spatial distrubution of algal available phosphorus (AAP) in sediments of Lake Taihu, the third largest freshwater lake of China, were also studied. Relationships between phosphorus forms in sediment and macrophytes coverage in sample sites, as well as phosphorus forms in sediments and chlorophyal contents in lake water were discussed. Exchangeable form of phosphorus (Ex-P) in surface sediments was significantly positive correlative to total phosphorus (IP), dissolved total phosphorus (DTP) and soluble reactive phosphorus (SRP) contents in the lake water. Bioavailable phosphorus (Bio-P) contents in sediments from macrophytes dominant sites were significantly lower than that in no macrophyte sites. In Lake Taihu, Ex-P content in top 3 cm sediment was highest. However, content of ferric fraction phosphorus (Fe-P) was highest in 4 - 10 cm. Bioavalilble phosphorus (Bio-P) contents in surface sediments positively correlated to Chlorophyll a contents in water of Lake Taihu with significant difference. Therefore, contents of Bio-P and AAP could be acted as the indicators of risks of internal release of phosphorus in the shallow lakes. It was estimated that there were 268.6 ton AAP in top 1 cm sediments in Lake Taihu. Sediment suspension caused by strong wind-induced wave disturbance could carry plenty of AAP into water in large shallow lakes like Lake Taihu.     

地球化学填图与地球化学勘查

在中国与西方国家，地球化学填图的目的与做法并不相同，西方的地球化学填图是由研究机构开展的，使用等离子焰光量计、X射线荧光光谱仪等大型仪器进行多元素分析，目的是取得多种元素在地球表层分布的基础性资料。地球化学勘查则由矿业公司主要分析少量成矿元素，目的是为了找矿。而中国的地球化学填图计划却做出了巨大努力，使地球化学填图取得的资料既有学术价值又对矿产勘查具有重大的实用意义。本文详细讨论了西方国家与中国地球化学填图与地球化学勘查的思路、方法与技术的演变，并瞻望了地球化学填图在21世纪的巨大发展前景。     

四川盐源马丝螺地区1：5万水系沉积物测量成果及金矿找矿方向

阐述了盐源马丝螺地区破碎带中金矿(化)体特征,结合该地区1:5万水系沉积物测量所圈定的组合异常特征、成矿元素地球化学特征,提出了该地区的找矿标志,指出了找矿方向。     

甘肃北山大石山A型花岗岩体的地球化学特征及构造意义

甘肃北山大石山岩体主要由角闪花岗岩和二长花岗岩组成,岩石的化学成分特点为过铝质(Al_2O_3含量为 12.18%～13.37%)、富硅(SiO_2含量为74.22%～78.38%)、偏碱(Na_2O+K_2O 为7.60%～8.50%),FeO~T/MgO 值高,CaO 和 MgO 含量低(分别为0.01%～0.99%和0.05%～1.15%),富含 Y、Nb 等高场强元素(HFSE)以及 F、Sr、 Ba 和 REE(∑REE=102.3×10~(-6)～120.02×10~(-6))低。这些特点与本区的 I 型和 S 型花岗岩有明显差别,是一种典型的 A_2型花岗岩。大石山岩体 Rb-Sr 等时线年龄为273 Ma,表明北山地区在海西晚期即进入造山后拉张裂解环境。     

COM技术在地球化学数据处理系统中的应用

区域地球化学信息作为反映矿产资源区域特性的重要指标,在区域矿产资源评价中占有重要的地位,为了有效利用该指标,这就要求研究实用可行的数据处理系统来更好地对地球化学数据进行处理,随着数据处理方法的不断完善和地矿信息化工作的不断提高,要求处理系统本身具有可重用性,可扩展性,高效性等特点,而组件对象模型（COM）技术提供了一种如何建立可重用、可扩展组件,以及如何通过组件高效率地构筑应用程序的一个规范,使得软件系统以组件方式集成成为可能,作者在COM技术内涵基础上,结合地球化学数据处理系统目前存在的若干问题,探讨了COM组件技术在地球化学数据处理系统中的应用,并对数据处理组件进行了分析设计。     

油气化探多元信息提取及含油气性灰色识别

以新疆塔北雅克拉测区为例,利用地表化探组合指标和因子得分为特征信息,由已知油气圈闭的特征指标构成灰色子波模型,对研究区的相应特征标志（比较数列）按一定的网度进行灰色滑动关联滤波分析,从中提取与灰色子波相关联的综合关联度异常,然后依据异常所处的地质背景,特征和幅值进行预测的区的含油气性识别评价,使复杂多样的化探异常转化为与油气直接相关的顶部信息,提高了油气晕圈闭评价的精度和识别的准确度。     

兴隆场构造油气地质及地表化探异常特征

兴隆场构造位于富顺县境内,为一简单而完整的穹隆状背斜,在其背斜构造两翼、轴部及扭曲部位发育同期断层。构造油气储层类型以嘉陵江组储层的裂缝型油气藏为主,其次有裂隙—孔隙型、孔隙型和裂缝一溶蚀孔洞型等。运用烃类、后生碳酸盐、吸附相态汞、二价铁和电导率等化探新方法,获得化探异常特征,结合构造特征,表明兴隆场构造油气富气范围为嘉陵江组一段顶界－７００ｍ以上的高部位地段。