安徽庐枞地区中生代火山岩区巴家滩火山穹窿的研究

巴家滩杂岩体位于庐枞中生代火山构造洼地的中心。地质填图，重、磁异常和卫片影象均显示出其为火山穹窿的特征。岩石、矿物地球化学的研究表明，辉石粗安岩与辉石二长岩同源，分别为火山穹窿的上部和根部。辉石二长岩形成于高温、超浅成的环境下，贫水、粘度较高的岩浆有利于火山穹窿的形成。本文根据地质资料的分析，揭示了巴家滩火山穹窿的演化历史。     

断陷盆地构造作用与层序样式

我国东部大多数中新生代含煤和含油气盆地是陆相断陷盆地，其层序形成和演化主要受控于幕式构造作用。笔者通过典型断陷盆地层序层的研究，根据构造沉降及其可容空间变化特点，提出了拉张型，挤压型，走滑－伸展型和热沉降型四种层序样式，并总结了各种层序中体系域构成特点，概括了多幕裂陷型，断坳转化型和走滑－伸展型三种层序地层格架模式。     

The Palaeomagnetic Study of the MineralizationAge of Gold Deposits in the Xiong'' ershan Area,Henan Province

Based on palaeomagnetic studies of the Precambrian gold deposits in the Xiong'ershan area, Henan Province, the authors infer that the ore-forming processes of the Beiling alteration-type gold ore deposit and the Dianfang breccia-type gold ore deposit started in the Proterozoic, and was superimposed by later mineralization, whereas the mineralization age of the Jiguanshan quartz- vein type gold ore deposit is Yanshanian.     

甘肃白银厂矿田的描述性地质模型

白银厂矿田产在北祁连下古生界优地槽岛弧带中，４０年代以来，普遍流行的观点是，白银厂矿田属火山—沉积成因，与黑矿成矿模式可对比。通过详细研究前人取得的大量地质资料并进行大量的野外调查，提出了白银厂矿田次火山热液成因的观点，建立了描述性地质模式，以图在白银地区进行矿床预测和勘察。白银厂矿田的含矿建造主要由细碧—角斑火山岩组成，其中产有发育良好的次火山岩。次火山岩主要由次石英角斑岩组成，其次有次角斑岩和次细碧岩。一定构造背景的块状酸性次火山岩是成矿有利地区，白银厂矿田的５个矿床均产在酸性次火山杂岩中。次火山岩具有多次侵入特点。卫星影象、重磁模式表明，成矿杂岩分布在具放射状线性构造的环形构造中心，具低密度低磁特点。因此，具上述特征的次火山岩分布区应该是今后找矿的有利地段     

黔西南铊矿床（点）赋矿地层中成矿元素的若干地球化学问题研究

本文以地球化学过程基本定律为指导，根据区域和矿区外围八条剖面１６９件样品的分析数据，采用柯尔莫各洛夫非参数正态检验法，对黔西南铊矿床（点）赋矿地层中成矿元素Ｔｌ、Ａｕ、Ｈｇ、Ｓｂ、Ａｓ、Ｐｂ、Ｚｎ的丰度值进行了研究。     

对软土抗剪强度试验的探讨

对沿海一带新建公路、铁路所作的软土试验中，经过分析研究，提出了试验方法的选择，强度指标的确定，影响强度的因素等，进行了客观论述。     

Water-rock interactions and chemical compositional variations during ductile deformation of the NW-striking shear zone in the Jiapigou gold belt,China

Two kinds of mylonite series rocks, felsic and mafic, have been recognized in the NW-striking shear zone of the Jiapigou gold belt. During ductile deformation, a large amount of fluid interacted intensively with the mylonite series rocks: plagioclases were sericitized and theAn values declined rapidly, finally all of them were transformed to albites; dark minerals were gradually replaced by chlorites (mostly ripidolite). Meanwhile, large-scale and extensive carbonation also took place, and the carbonatization minerals varied from calcite to dolomite and ankerite with the development of deformation. The δ¹³C values of the carbonates are −3.0‰ – −5.6‰ suggesting a deep source of carbon. The ductile deformation is nearly an iso-volume one (f _v≈1). With the enhancement of shear deformation, SiO₂ in the two mylonite series rocks was depleted, while volatile components suchs as CO₂ and H₂O, and some ore-forming elements such as Au and S were obviously enriched. But it is noted that the enrichment of Au in both the mylonite series rocks did not reach the paygrade of gold. The released SiO₂ from water-rock interactions occurred in the form of colloids and absorbed gold in the fluid. When brittle structures were formed locally in the ductile shear zone, the ore-forming fluids migrated to the structures along microfractures, and preciptated auriferous quartz because of reduction of pressure and temperature. Fluid inclusion study shows that the temperature and pressure of the ore-forming fluids are 245–292°C and 95.4–131.7 MPa respectively; the salinity is 12.88–16.33wt% NaCl; the fluid-phase is rich in Ca²⁺, K⁺, Na⁺, Mg²⁺, F⁻ and Cl⁻, while the gaseous phases are rich in CO₂ and CH₄. The δD and δ¹⁸O, values of the ore-forming fluid are −84.48‰ – −91.73‰ and −0.247‰ – +2.715‰ respectively, suggesting that the fluid is composed predominantly of meteoric water. This project is financially supported by the National Natural Science Foundation of China (No. 9488010).     

吉南玄武岩覆盖区水化学异常查证──以两处金矿化的发现为例

本文通过实例,介绍了吉南玄武岩覆盖区水化学异常查证的化探工作方法。综合研究已有地质条件,认为吉南沿江村、马鹿沟水化学异常地区成矿地质条件有利。结合微景观特点,在沿江异常区2km²范围内应用汞气测量圈出区内断裂构造带展布方向。岩石剖面、土壤测量显示出构造经历过热液矿化活动,矿化体埋藏较深。根据土壤测量结果优选出验证靶区。钻探验证结果在地表620m以下发现了近30m厚的Au矿化体,Au含量最高1.5g/t.马鹿沟水化学异常区使用水系沉积物测量进行异常追踪,迅速缩小了找矿“靶区”.使用重矿物测量在“靶区”内进一步追踪发现了Au矿化源。在此基础上经大比例尺土壤测量辅以岩石剖面测量,圈出了一个有望找到火山岩型浅成热液金矿床的成矿远景区。     

群桩设计新思路探讨

通过对群桩基础桩顶反力、位移分析，提出群桩基础的安全度定义，在此基础上，建议了群桩优化设计的思路。     

雨后麦田土壤湿度变化的诊断分析

通过分析研究冬小麦生育期，影响雨后麦田土壤湿度变化的主要因子，建立了雨后小水分渗透深度及不同土层的土壤湿度变化诊断模式。利用１９９１－１９９４年冬小麦不同时段的实测资料进行的对比分析表明，各模式的计算结果是较为满意的。