均匀介质中散射过程的奇性分析

本文比较详细地讨论和分析了均匀介质中零偏移距散射曲面拓扑奇性和相应回波解析奇性之间的关系和分类.其基础是衍射理论的Kirchhoff积分,原理是通过曲面几何函数的解析奇性和距离函数的拓扑奇性之间的联系.基本的数学工具是Morse理论和突变理论.     

ENERGY EQUATION AND SYMMETRIC INSTABILITY CRITERION

In this paper,by using generalized normal mode method the symmetric instability criterion which can be used not only in the constant parameters but also in the variable parameters was derived from the energy equation on the symmetric disturbance.If the thermal wind was in balance or quasi-balance,the criterion was consistent with that obtained by Emanuel with parcel method and Hoskins with normal mode method.It is shown that in the generating stage of disturbance,the symmetrically instable development of disturbance is associated with the energy transformation by which the energy of the basic field is transferred into the energy of the disturbance field.     

凤凰─茶陵地学断面重力异常机制分析

对凤凰─茶陵地学断面重力异常,根据爆炸地震测深资料,确定密度分层,用变密度水平梯形体构制剖面密度模型,计算理论重力异常和实测布格重力异常吻合较好。根据剖面密度模型,可以合理地解释布格重力异常。并将地壳划分为沉积盖层、变质岩层、麻粒岩层三层结构,分别计算三层的重力效应曲线及上地幔低密度体重力效应曲线。还计算了莫霍面起伏引起的重力异常曲线,分析了引起地壳重力异常的各种因素及特点。     

浙西北火山盆地铀矿主要类型,产出条件及找矿方向

本文根据铀矿化特点，将浙西北火山盆地铀矿划分为３种类型，即沉积（成岩）型、热液脉型及沉积－热液叠加改造型（层控型）铀矿。系统地总结了不同类型铀矿的地质特征及产出条件，探讨了各类铀矿的成因联系及成矿模式，指明了火山盆地铀矿的找矿方向及途径。     

Ｅ网格变量分布下差分格式的性质

本文用线性化的浅水波方程系统地分析、讨论了Ｅ网格变量分布下差分计算的性质；指出了目前有关讨论Ｅ网格差分性质在方法上存在的问题；给出了一种解决Ｅ网格中两个Ｃ网格分离的方法；提出了一种Ｅ网格用于海洋计算时，海洋侧边界条件的处理方法。初步的数值试验证明了这些方法对抑制Ｅ网格中的计算躁声是有效的。     

邢台强震的深部三维构造背景和孕震条件

在邢台地震区开展了地震转换波测深工作，得出了６条深部构造剖面图，其中包括３条ＮＷ向和３条ＮＥ向剖面，同时也得出了地壳内Ｇ、Ｃ和Ｍ３个主要深部界面的埋深分布图以及地壳内波速分布模型。在此基础上讨论了邢台强震发生的深部三维构造背景和深部孕震条件     

郴县新田岭钨矿床地质特征

郴县新田岭白钨矿床，是一个大型─超大型矿床。储量巨大的Ⅰ＿５、Ⅰ＿（３０）和Ⅱ＿（２３）号主矿体，皆赋存在燕山早期花岗岩与石磴子组灰岩接触带的凹陷部位，三个主矿体的钨金属量，占矿区总储量的９０％以上。矿床矿物成分、结构构造和围岩蚀变均较复杂，其中晚期复杂矽卡岩与钨矿化关系密切。本矿床的形成，受成矿岩体、有利的围岩和接触带及层间破碎带控制，矿床的成生，经历了两个成矿期５个成矿阶段。矿床成因属气化─高温热液矿床。     

Physicochemical Conditions during the Formation of Dalingkou Ag—Pb—Zn Deposit,Zhejiang Province

On the basis of mineral paragenesis and the chemistry and homogenization temperatures of fluid inclusions, the physicochemical parameters were calculated for the formation of the Dalingkou Ag-Pb-Zn deposit in Zhejiang. From the early to the late stage of mineralization the ore-forming temperature venation was found to be 298.5 °C → 267.0 °C → 217.6 °C → 167.3 °C, with a corresponding pH change of 3.0 ∼ 5.8 → 6.1 → 6.7→ 5.0 ∼ 7.3. The pressure changed from 403.8 to 128.5 atm, andlogf S₂-9.9 → -11.2 → < -15; logf o₂< -44→ -45.6 ∼ -42.6 → > -44.2; and logf co₂ around -1.55. In conjunction with geological observations, the deposit is considered to be of meso-epithermal origin, i.e., it was formed after continental volcanic-subvolcanic activity. The major factors affecting ore precipitation are the decreasing temperature and the increasing pH of ore-forming solutions.