“Three-Component” Digital Prospecting Method：A New Approach for Mineral Resources Quantitative Prediction and Assessment

“Three-component” method consists of three clase-connected aspects: geological anomaly,diversity of mineralization and mineral deposit spectrum. All these three concepts are not new separately, but it is a new approach to combine these three aspects in one single concept for quantitative mineral resources prediction and assessment and it is also the first time to conduct a more detailed study in each aspect. Investigation and clarification of geological anomalies, diversity of mineralization and spectrum of mineral deposits are realized by digitization and quantification of ore forming controlling factors, oreexisting symbols or marks, characteristics of mineralization and regulation of ore-genesis and laws of distribution. These procedures lead to construction of a “digital model“ for mineral resources prediction andassessment.     

民乐、山丹6.1级地震异常及台站实现短临预报的思考

在综合分析了民乐-山丹6.1级地震前张掖中心台范围内震兆异常特征的基础上,总结了本次地震前该台的短临预报过程及存在的问题,对今后台站如何搞好地震短临预报工作进行了探讨.     

地震活动标度ΔF震前时间扫描异常浅探

运用地震活动标度ΔF对大华北地区MS≥6.0级地震震前资料进行时间扫描,结果表明,地震活动标度ΔF大多在震前1～2年出现超出一倍均方差的异常;运用该方法还对河南及邻区ML≥5.0级地震震前资料进行了探索,同样,中等地震震前也有一定的异常反映。     

山西省平陆县关西沟一带铜铅锌多金属矿利用θ函数处理数据找矿研究

文章以关西沟矿区为试验区（矿区西部为已知矿带），对全矿区进行了1：10000水系沉积物测量，通过对元素迁移过程的主要因素分析和产在同一地形类的多基元景观的共生组合分析，编制出组合元素组，计算θ函数值，利用θ函数值圈定异常，作为判断矿致异常和非矿异常的依据。布设了5条岩石剖面，以进行异殿堂检查，除西部异常带与已知矿化带对应外，在中部发现了铅异常带，在东部发现了铜异常带，进一步证实了应用θ函数处理数据的方法可获得用以指导找矿的重要信息。     

Natural thermoluminescence of fossil foraminiferals as a potential proxy for deep-sea temperature changes

Foraminiferal shells from two piston cores separately located at the Ninetyeast Ridge and the Bengal Fan of the Indian Ocean were selected and purified for measurements of natural thermoluminescence （NTL） intensity by a high precision thermoluminescence meter （RGD-3）. Variations of the NTL intensity along the two core sequences both spanning the last two glacial--interglacial cycles displayed a strong, identical signal of the global ice volume cycles, which matched well with their corresponding oxygen isotope data. As higher NTL intensity occurred within interglacial periods and changes in an NTL signal were most likely influenced by the temperature of ambient seawater in which the planktonic foraminiferal shells long existed, the NTL signal could be considered as a potential proxy for orbital scale temperature changes of bottom seawater in the tropical Indian Ocean.     

川西北龙门山—邛崃山地壳—上地幔的结构构造特征

试以地质和地球物理资料讨论川西北龙门山—邛崃山地区地壳—上地幔结构构造特征。区内地壳分上、中、下三层。岩石圈西厚东薄。首次发现存在壳内低速—低阻层,推断由糜棱岩化花岗质层所引起,是区内主滑脱面。其上构造岩席,在断面上呈西厚东薄的“楔形”。提出彭灌杂岩属中地壳组分,由西北向东南逆冲达50余km。在区内西部,纵向上存在相互直交的“立交桥式”构造。在映秀断裂带东南侧,显示爆炸地震纵波三角形异常和大地电磁测深高阻异常,它们似由川中克拉通西北部前寒武纪岩浆杂岩所引起,对川西北高原隆升起了砥柱作用。 根据波速度、电性资料,结合区域地质、重磁和天然地震等特征,可将区内划分出4个构造单元。最后简述该区的构造演化。     

不规则网土壤测量在水系沉积物异常查证中的应用

在大兴安岭森林沼泽景观区,植被茂盛、土壤表层腐殖质发育,且通视条件差,运用传统的规则网土壤测量方法进行1/5万水系沉积物异常查证,工作周期长、劳动强度大;采用不规则网土壤测量方法进行异常查证,取得了快速评价异常、追踪异常源,缩短找矿周期的效果。     

考虑温度和密度影响的非饱和黄土土-水特征曲线研究

取扰动黄土进行试验研究,测试得到了不同密度和温度黄土土样的土-水特征曲线。试验资料揭示出：密度变化引起基质吸力的变化非常显著。相对而言,温度变化引起基质吸力的变化不显著。对于一定含水率的土样,温度变化引起的吸力变化值在高含水率时较小,可以忽略不计,而在低含水率时较大;温差越大,吸力变化越大。进一步基于试验资料的分析,得到了考虑密度和温度影响的土-水特征曲线的表达式,并通过计算和测试结果的对比分析,验证了表达式的合理性。     

γ射线透射法测煤灰分的影响因素及校正方法研究

介绍了低能γ射线透射法测量煤灰分分析系统，并且说尽论述了分析系统在测量过程中对测量结果产生主要影响的粒度、温度、成分、水分等因素，针对各种影响因素产生机理，通过大量的粒度、温度、成分、水分等实验，给出动态追峰法，自动补偿法等实用校正方法。