刚果（金）砂锡矿地质特征及找矿方向

通过对矿床区域地质背景、矿床地质特征及成矿规律的初步研究,阐述了刚果(金)砂锡矿的成矿条件及分布规律,并了解区内可能含砂锡矿的红土层分布范围及分布深度,探求红土层中可能含有的砂锡矿品位.对在区域上寻找同类型矿床具有一定的参考意义.     

三个目标间空间方位关系表达模型及其GIS应用

空间方位是一类重要的空间关系,它不同于目前研究较多的方向关系。空间方位关系描述的是三个目标间的空间关系,它的理论基础是基于射影几何中的三点共线不变性。本文首先阐述了空间方位的基本定义、表达基础以及它与拓扑关系、方向关系的区别。然后,重点回顾了6种较为有代表性的方位关系描述模型,指出了这些模型的适用性,并对这些模型进行了比较分析。最后,简要地分析了空间方位关系在GIS中的应用前景以及有待进一步研究的若干问题。     

大营地区古层间氧化带识别与空间定位预测

潜在铀储层内部的层间氧化作用与铀成矿作用同时进行而且密不可分,（古）层间氧化带被认为是砂岩型铀矿的重要找矿标志。运用岩芯和钻孔资料以及各分带的岩石矿物学以及地球化学特征等信息识别古层间氧化带,结合铀储层中具有古氧化性质和还原性质的岩石地球化学标志,定量地给予古层间氧化带以空间定位,并据此可以划分出古完全氧化带、过渡带和还原带。在此基础上,探讨了铀储层规模、隔挡层、暗色泥岩及煤层等因素对于古层间氧化带分布的影响。     

Relations between left-lateral strike-slip faults and right-lateral monoclinal kink bands in granodiorite,Mt. Abbot quadrangle,Sierra Nevada,California

Small left-lateral strike-slip faults and right-lateral monoclinal kink bands with subvertical fold axes may be related to the formation of a very large right-lateral kink band (Bear Creek kink band), about 8 km wide and at least 15 km long, trending N27W along Bear Creek Valley in the Mt. Abbot quadrangle, Sierra Nevada, California.A foliation within Bear Creek Valley is defined by vertical slabs of granodiorite bounded by joints and faults. Small strike-slip faults and larger fault zones have nucleated along preëxisting joints and accommodated shearing between granodiorite slabs. The orientations of small cracks that occur near the tips of faults or connect adjacent fault segments indicate that the direction of maximum compression was about 20° counterclockwise from traces of joints at the time the faults nucleated. In some places where faults are closely spaced there are small, right-lateral kink bands with widths of 1 to 20 m. The slabs of granodiorite are gently curved through the kink bands, and analysis of the orientations of slabs in the limbs of the small kink bands indicates that the direction of maximum compression during kink-band formation was 15° to 20° counterclockwise from the traces of faults outside the kink bands. The orientation of the maximum compression for the formation of the small cracks at tips of many strike-slip faults and for the formation of the small kink bands, relative to the orientation of the maximum compression inferred from the joints on the limb of Bear Creek kink band, suggests that the foliation within the Bear Creek Valley has reoriented a maximum of 40° to 60° clockwise. Although the various orientations of joints, faults, and kink bands could be explained in terms of different regional compression directions at different places and at different times in the Mt. Abbot quadrangle, a much simpler interpretation, based on analysis of large and small structures in the granodiorite in Bear Creek Valley, is that they all formed in response to one maximum regional compression in the direction N25E.     

数字化内业制图测站纠错问题的研究

数字化测图外业全站仪设站中,时常会发生测站点点号或照准点点号错录的情况,当回到内业计算机展点时会发现大量碎步点偏离了其真实位置,如何在内业成图时给予纠正而不需要外业重测是所有测量单位常常会遇到的问题,本文就这一问题进行了一定的探讨。     

基于姿轨参数的高分辨率卫星遥感影像定向模型

文章在基于传统姿轨参数的高分辨率卫星遥感影像定向模型基础上,用轨道半径变化率代替轨道偏心率和近地点幅角,并通过差商内插法求解姿轨参数的偏导系数,使平差所需控制点减少为4个.对SPOT-5HRG影像的试验表明,影像定向后像方检查点中误差小于±2pixels,对地定位精度可满足1∶50 000比例尺测图要求.     

An inverse approach to constraining strain and vorticity using rigid clast shape preferred orientation data

We describe a three-part approach for modeling shape preferred orientation (SPO) data of spheroidal clasts. The first part consists of criteria to determine whether a given SPO and clast shape are compatible. The second part is an algorithm for randomly generating spheroid populations that match a prescribed SPO and clast shape. In the third part, numerical optimization software is used to infer deformation from spheroid populations, by finding the deformation that returns a set of post-deformation spheroids to a minimally anisotropic initial configuration. Two numerical experiments explore the strengths and weaknesses of this approach, while giving information about the sensitivity of the model to noise in data. In monoclinic transpression of oblate rigid spheroids, the model is found to constrain the shortening component but not the simple shear component. This modeling approach is applied to previously published SPO data from the western Idaho shear zone, a monoclinic transpressional zone that deformed a feldspar megacrystic gneiss. Results suggest at most 5 km of shortening, as well as pre-deformation SPO fabric. The shortening estimate is corroborated by a second model that assumes no pre-deformation fabric.     

江苏溧水金驹山金多金属矿的控矿因素及找矿方向

通过分析金驹山矿区的地层、构造、岩浆岩、围岩蚀变及矿石构造等地质因素,认为金驹山矿区的断裂构造严格控制着矿区内矿脉和岩脉的规模、产状及产出位置,是矿区的主控矿因素,同时也是矿区的主要找矿标志;粗安斑岩与矿区成矿热液源于同一母岩浆,其分布对矿体分布有一定的指示意义。同时总结矿区成矿规律,认为金驹山矿区神墩山与金驹山之间第四系覆盖区和矿区以北曲山地区为今后寻找金驹山类型矿床的有利地段。     

龙岩煤田地质特征及“四下”找煤研究

通过对龙岩煤田深部地质特征及煤系地层之上的各类盖层特征分析,从沉积环境、同沉积构造及后期构造等方面,研究其对童子岩组煤系发育的控制作用,研究其深部煤炭赋存条件及规律,通过勘查案例,提出隐伏区下找煤思路,即推覆体、滑覆体、红层、火山岩下找煤(简称"四下"找煤)。通过分析龙岩煤田隐伏区深部煤炭资源潜力,指出找煤方向,为该区煤田深部勘查和资源预测提供依据。