覆盖区成矿预测方法探讨——以蚌埠地区金矿预测为例

本文以蚌埠地区金矿资源预测为例,探讨了覆盖区及半覆盖区矿产预测的途径和方法。指出,地球物理、地球化学、遥感地质等多种信息的综合解译和与矿产地质信息的有机关联,是揭示隐伏矿成矿规律的重要手段;采用“矿产二次预测方法”通过大区矿产预测模型向预测区逐步扩散,建立起本区统计预测模型,是在覆盖区开展模式类比预测的可行途径。文中讨论的成矿预测方法在安徽省蚌埠地区金矿预测中取得了较好效果,对我国中西部地矿产地质研究程度不高地区的成矿预测,具有普遍参考意义。     

下扬子断陷带中壳幔混源型产铀花岗岩的地质地球化学特征

对安庐石英正长岩带(AL)及姚村钾长花岗岩体(YC)的岩体地质、矿物岩石学,岩石化学,稀土元素、以及Sr、Pb、O同位素组成等一系列特征的研究表明,下扬子断裂坳陷带内花岗岩体的初始物质来源较深,系上地幔部分熔融产生的贫水偏碱岩浆沿深断裂上升侵位过程中同化混染了部分陆壳物质而成。据锶、铅同位素的二元混合模型计算,安庐岩带和姚村岩体的成岩物质中地幔组分分别占57％和52.8％,地壳组分分别为43％和47.2％。它们的成因系列应归属于壳幔混源型。     

中国的磷铁锂矿—磷锰锂矿系列矿物

磷铁锂矿与磷锰锂矿是一完全类质同象系列中两个端员矿物。磷锰锂矿在我国新疆伟晶岩中已有大量发现。笔者于1984年在福建南平稀有金属花岗伟晶岩中发现了典型的磷铁锂矿。此外,早在1980年笔者还在新疆青河富铍伟晶岩中发现了成分介于该类质同象系列中间的磷锰铁锂矿。对后两个产状的矿物进行了较详细的矿物化学成分和物理性质研究。结合前人的资料,文中系统地讨论了国内所发现的六个产状的磷铁锂矿-磷锰锂矿系列矿物的化学成分特征及变化规律,化学成分与光学性质、物理性质、晶胞参数等之间的相互关系,并系统地引用了大量国外资料作对比。讨论了矿物中Mg、Ca等含量对这些特征的影响。另外,笔者还研究了该系列矿物成分与红外光谱之间的关系,指出矿物的红外吸收谱带频率与铁锰比值间呈良好的线性关系,并给出了相关关系式。     

Favourable geological environments for uranium mineralization, Peninsular Malaysia

An appraisal of the 1977–1978 regional reconnaissance geochemical data obtained under the Central Belt Project indicated that the Boundary Range Granite, the Senting Granite, and the Benom Igneous Complex appear to constitute favourable uranium exploration targets. Results of the airborne survey subsequently flown within the Project area in 1980 showed high radiometric responses over these and other granitoids. Recent follow-up of a multi-element geochemical anomaly over the Boundary Range Granite has resulted in the discovery of some uraninite-bearing boulders and an abnormally radioactive ironstained quartz vein containing uranium-bearing rhabdophane and florencite. Yet another potential target appears to be the Main Range Granite. Although not within the Project area, it has the distinction of hosting the first recorded uranium occurrence in Peninsular Malaysia.Contrary to earlier belief, the importance of the continental Mesozoic Tembeling and Gagau Groups as possible uranium hosts has been reduced, judging from the poor airborne radiometric response and the overall low geochemical results. On the other hand the Tertiary basins, not previously accorded attention, should be assessed.     

概率成像方法对地下球体定位的应用研究

概率成像方法是一种新颖的成像方法。它是利用测量的地面电场函数与电场扫描函数进行归一化的互相关运算，从而对地下电荷进行定位。本文对电法勘探中，地下球体进行了概率成像研究，给出了理论模型和成像结果，从而也证明概率成像方法确实是一种行之有效、计算简便的方法。     

SEDIMENTARY PATTERN OF PROTOTYPE BASIN IN THE DEPOSITION PERIOD OF LAIYANG FORMATION AND THE ADVANTAGEOUS AREAS FOR OIL AND GAS EXPLORATION OF JIAOLAI BASIN

1 Introduction As a Mesozoic relict terrestrial basin controlled and reformed by fracture activities in themiddle to late stage in Mesozoic, Jiaolai basin is situated in the middle of the Ludong uplift, beingoverthrusted upon Jiaobei uplift in the north, adjoining Jiaonan uplift in the south atWulian-Rongcheng fracture, being connected to Tanlu fracture belt in the west, with its NE partextending into the Yellow Sea and connecting to Qianliyan uplift at Qianliyan fracture. Due totec…     

氢化物发生-原子荧光光谱法测定多金属矿中的锡

多金属矿样品经酸溶解,Fe(OH)3共沉淀分离除去大部分Cu、Pb、Zn等干扰组分.含Sn沉淀经碱熔,水提取,氢氧化物进行二次沉淀分离,然后在酸性介质中,加入酒石酸-硫脲-抗坏血酸为掩蔽剂,用氢化物发生-原子荧光光谱法测定样品中的Sn量.方法检出限为0.20μg/g,样品中Sn的含量为7.47 μg/g和21.6 μg/g时,RSD(n=12)分别为6.5%和4.0%,加标回收率为88.6%～113.0%,经国家一级标准物质验证,结果与标准值相符.     

一种基于自适应谐振理论的TM遥感影像神经网络分类器

提出了一种基于自适应谐振理论建立起来的自组织模糊ARTMAP神经网络分类器。分析了ART神经网络的结构和工作原理,给出模糊ARTMAP神经网络分类的具体算法,并将其运用到TM遥感影像分类的实验中。结果表明模糊ARTMAP神经网络分类器的速度快,精度高,比常用的BP网络具有更好的性能。     

位于预测区边缘附近的地震统计检验问题

对位于地震预测工作所圈定的地震危险区附近的地震的统计检验问题 ,一直是地震预测研究中一个颇有争议的问题。本文以中国地震局全国年度地震趋势会商的情况为例 ,对这一问题进行了探讨。结果表明 ,将所划定的地震危险区适度扩大 ,即将现有的地震危险区范围向外扩大约 0 5° ,可以显著地提高预测地震的“命中率”。但从统计检验的角度说 ,这样做并不能提高实际地震预测的能力 ,亦即并不能使R值有显著的提高。     

Multiplet relative location approach and waveform correlation correction and their application

Introduction When the distribution of a cluster of earthquakes is concentrated, distance between hypocen-ters is much smaller than the event-station distance and than the scale length of the velocity het-erogeneity in the hypocenter region; in this case, the ray path from each hypocenter to a common station will be almost the same. The relative location method can be applied to accurate location of the cluster in the above case. In this approach, the relative location is calculated with the ar…