矿物发光材料CaS：Mn^2＋的合成及其荧光性质

以方解石为原料，使用硫化助熔剂法合成了CaS:Mn^2 磷光体，根据荧光光谱，详细探讨了矿物杂质对其发光性质的影响，指出在矿物材料CaS:Mn^2 体系中，某些杂质离子拓宽了基质的激发带，有利于基质吸收能量及基质-→Mn^2 发射中心的能量传递，但Fe^2 、Co^2 、Ni^2 等离子降低了Mn^2 的发射强度，尤其是Mn^2 与它们形成的成对离子中心或离子晶簇，降低了局域对称性，放宽了Mn^2 跃迁发射的选择定则，加速了材料发光的衰减过程。     

广州瘦狗岭断裂带的变形期次

根据广州瘦狗断裂带变形历史的野外地质证据以及^40Ar/^39Ar法和热释光法构造年龄数据，将其划分出晚三叠世－早侏罗世韧性拉伸剥离变形期，中侏罗世韧性挤压逆冲期，晚侏罗世末－早白垩世初脆性断裂、硅化作用期，晚白垩世－老第三纪同沉积正断层活动、硅化作用期，老第三纪晚期左行平移兼正断层活动期和第四纪正断层活动期。对该断裂带的变形期次与区域构造演化的联系进行了讨论。     

四川九寨沟地区黄土的初步研究

九寨沟地区的黄土孤立产出于海拔2 300－2 800m的洼地中，其内含古风化界面。通过对黄土的物质成分、结构、扫描电镜形貌、孢粉、ESR测年等分析测试，确定其为冰缘黄土，划分了九寨沟地区更新世冰期。     

区域重力地改“测点高程平移法”精度探讨

在讨论测点高程平移法区域重力地改的精度问题基础上，提出了系统差概念，并推荐一种新的计算方法，即把测点高程平移法和节点高程插值法有机地结合起来实现地改，通过理论模型和实例计算，表明该方法计算精度优于节点高程插值法和测点高程平移法。     

Distribution Characteristics of Gold and Other Trace Elements in the Proterozoic Lengjiaxi Group,Northeastern Hunan Province

Systematic geochemical studies of the Proterozoic Lengjiaxi Group in northeastern Hunan Province suggest that the Lengjiaxi Group is a Au-As-Sb-W association-type Au-bearing turbidite formation.The contents of Au,As,Sb,W,Cr,Mn,Pb and Zn in the turbidite formation are more than two times as high as the average contents of trace elements in the upper continental crust.The low abundance of Ag and the close correlation between Au and As are two important characteristic features.In the Au-bearing turbidite formation the enrichment of gold is due to the extensive occurrence of Au-bearing pyrites.Higher contents of Au,W,Sb and Ag in the greywacke indicate that they also exist in the form of heavy minerals.Au,Ag,As,Sb,W and REE in the Au-bearing turbidite formation have a close genetic relation with the chemistry of the gold deposits.     

Characteristics of the Two Types of Granits at Sikongshan in the Eastern Part of the Dabieshan Mountains

It has been shown from petrologic,geochemical,trace element and REE evidence that the gran-ite intrusions at Sikongshan,Anhui Province,can be assigned to two distinct types which are radically different in age and origin.The Precambrian gneissic granited resulted from remelting of old continental crust while the Mesozoic granites were derived ,also through remelting,from low-Rb/Sr rocks at greater depths.Granite masses at Tiantangzhai and Zhoujiawan in the Dabieshan Mountains are also dicussed.     

广东韶关地区土壤环境背景值及其影响因素

土壤元素背景值是土壤环境现状研究的重要内容,查清土壤中元素的含量及分布特征,可为区域环境质量评价、土壤环境标准制定、土地资源优化以及地方性疾病的防治提供科学依据。对广东韶关地区3 969件表层土壤样品中54项元素(指标)进行了研究,并与中国土壤A层背景值及广东土壤A层背景值进行对比。结果表明：韶关地区土壤中聚集了与成矿作用密切相关的元素,并形成高背景场,Mo、I、Br、Ag等元素相对贫乏;成土母质是土壤环境背景值最重要的影响因素,不同母质的土壤元素背景值差异较大;土壤类型及土壤有机质含量对土壤环境背景值有一定的影响,总体来看,黄壤、黄红壤、石灰土为区内大部分元素高背景值土壤类型,红壤与潴育性水稻土的环境背景值大致与全区的背景值相当;赤红壤、紫色土中大部分元素背景值较低,有机质含量与土壤元素背景值呈正相关关系。     

Silicon Isotope Geochemistry of Micro—Fine Disseminated Gold Deposits in SW Guizhou and NW Guangxi,China

Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi.The results showed that quartz in wall rocks.ores and that in association with hydrothermal silicification are distinctive in silicon isotopes and cathodoluminescence characters.Quartz in association with primary silicification is non-luminescent while that in wall rocks and associated with secondary silicification exhibits striking luminescence.Based on the dynamic fractionation of silicon isotopes,it is suggested that the mineralization was accompanied by rapid transport of aprimary siliceous fluid along the major deep fault system into subordinate faults before ore components deposited in favorable strata via penetration and metasomatism.Therefore,a deep origin is implicit for gold deposits of this type.     

Geochemical Evolution and Environmental Changes of Qinghai—Xizang Plateau Since Late Cenozoic

Long-and short-term climatic curves were preliminarily established based on the comprehensive analysis of geochemical information since the Late Cenozoic in the Qinghai Xizang(Qinghai-Tibet)Plateau.The curves show that the climate in the plateau was alternatively dry-warm and cold-wet during the period of 30-3.4 Ma when the plateau was not uplifted to an enough altitude and the monsoon was not completely formed either,In the period of 3.4-0.73 Ma.the climate fluctuated between dry-cold and wet-warm when the plateau was rapidly uplifted and the Asian monsoon was consequently formed.Since 0.73 Ma.the climate became even drier when the plateau continuously rose.In the Holocene period.the climate alternatively changed with a complex model of being cool-dry,warm-wet and cold-wet.     

鄂西黄陵背斜核部中段金矿基本特征及成矿规律

黄陵背斜核部中段的石英脉型和蚀变岩型金矿,具有斜列侧伏性、群聚分带性、似等距性、自相似性及易采、易选等特点。金成矿过程经历了初 始富集、预富集、工业富集、次生富集４个时期和岩浆热液主成矿期的４个阶段,黄陵花岗杂岩是其主要热源和矿源,复合剪切带和古构造格架控制其产布。金矿床为受剪切带控制的中低温岩浆热液型矿床,成矿时代为晋宁晚期,其形成主要与扬子旋回古造山作用有关。