TIN模型在地球化学勘查的计算机辅助制图中的研究和应用

以济源西北部 1∶ 5 0 0 0 0水系沉积物测量和嵩县小南沟金矿区地球化学勘查两个项目为实例 ,总结了 TIN模型在区域化探扫面和矿区化探剖面的辅助制图中的应用特点及需注意的问题 ,着重介绍了数据布局方法和调整 Delaunay三角剖分网技术 ,对在不规则采样区域边界带圈等值线的形状问题 ,首次采用虚设采样点的方法进行处理 ,取得了很好效果     

轮南油田原油中三甲基苯基类异戊二烯化合物的检出及其意义

轮南油田不同时代储层原油中检出了丰富的三甲基苯基类异戊二烯化合物。该类化合物被普遍认为是来自于高盐度和强还原水体沉积环境中绿硫菌体内的类胡萝卜素的特征性生物标志化合物。该类化合物的检出对轮南油田烃源岩研究具有重要的指示意义，暗示了具有分层水体或高盐度的强还原环境下发育的优势烃源岩，对该区烃类的主力生烃贡献不容忽视。基于C15-3，4，5-三甲基苯基类异戊二烯异构体在轮南油田原油中的分布规律，及C15-3，4，5／C13-2，3，6-比值与Pr／Ph，Ga／C31H和Ts／Tm等常规地球化学参数的对比，说明具有生源意义、能够指示沉积相特征的三甲基苯基类异戊二烯化合物分布，在一定程度上也受烃类热演化程度的影响。     

内蒙古北山东段珠斯楞铜金矿床的基本特征

珠斯楞铜金矿位于晚古生代板块缝合部位,产于华力西晚期花岗斑岩和闪长玢岩岩脉中,通过矿区基础地质、物化探等的研究,确定有2个矿体、1个矿化体。主要矿石矿物为黄铜矿、黄铁矿、磁黄铁矿、闪锌矿、方铅矿、毒砂等,呈浸染状、细脉状分布。化探垂直分带性表明,Au和前缘晕元素在浅部富集,Cu在中深部富集。矿床为斑岩型,主要发育青磐岩化带,其可作为区域上大型斑岩铜矿的找矿标志。     

覆盖区多目标地球化学调查数据应用前景浅析--以江苏省国土生态地球化学调查有关成果为例

多目标地球化学调查是一项基础性、公益性地质调查工作，江苏省的多目标地球化学调查是全国实施此项工程的重要组成部分，可作为覆盖区开展此项工作的一个代表。本文简介了江苏省开展多目标地球化学调查工作的基本情况，用具体实例说明了多目标地球化学调查数据在示踪人类活动对自然土壤环境的影响、研究区域地质背景对土壤环境的制约作用、开展局部土壤生态环境安全预警、指导开发利用局部富Se土壤资源等方面的初步应用效果，对江苏省多目标地球化学调查资料的应用前景及如何进一步利用好多目标地球化学调查数据的相关问题进行了专门探讨，并提出了有关建议。     

有色地质部门勘查地球化学理论与技术创新成果综述

对有色地质部门50年来勘查地球化学理论与技术创新主要成果进行综合评述,对这些理论与技术创新的时代背景、创新内容、技术特点及应用效果作了简要介绍.     

内蒙古东乌旗阿尔哈达银铅锌矿区地质、物化探特征及其找矿意义

在内蒙古东乌旗阿尔哈达矿区通过地质、物、化探综合手段进行找矿,取得了良好效果,现已发现3个成矿带,仅在Ⅰ号矿带就发现规模不等的矿体近20个,初步概算银、铅锌资源量已达到中型矿床规模.该矿区的找矿经验对在草原覆盖区开展找矿工作具有指导意义.     

青海省冷湖小赛什腾铜矿岩屑地球化学特征

文章总结了小赛什腾铜矿的地球化学特征,认为闪长岩体本身含铜,岩体内存在着多期多阶段矿化叠加及多种矿化类型,平面上元素分带明显.指出了Cu,Au,Mo异常叠合部位仍是重点找矿地段.     

Comparison of Linear Regression Models for Quantitative Geochemical Analysis: An Example Using X-Ray Fluorescence Spectrometry

This paper presents statistical aspects related to the calibration process and a comparison of different regression approaches of relevance to almost all analytical techniques. The models for ordinary least-squares (OLS), weighted least-squares (WLS), and maximum likelihood fitting (MLF) were evaluated and, as a case study, X-ray fluorescence (XRF) calibration curves for major elements in geochemical reference materials were used. The results showed that WLS and MLF models were statistically more consistent in comparison with the usually applied OLS approach. The use of uncertainty on independent and dependent variables during the calibration process and the calculation of final uncertainty on individual results using error propagation equations are the novel aspects of our work.     

Viscous Energy Dissipation and Strain Partitioning in Partially Molten Rocks

We develop a steady-state fluid-mechanical analysis describingthe effect of strain partitioning on viscous energy dissipation.As observed in experimental studies of shear deformation ofpartially molten rocks, strain partitions when melt segregatesbecause viscosity is reduced in regions of elevated melt fraction.The equations derived here are based on parameters measuredin experiments, describing the evolution of melt distributionand rheological properties. We find that the dissipation dependsstrongly on the configuration of the melt-rich network of shearzones, including the average angle, volume fraction of meltand amplification of strain rate in the melt-rich bands. Minimain energy dissipation as a function of band angle develop, correspondingto configurations of melt networks that minimize the differencein mean stress between the band and the non-band regions. Wepropose that the organization of band networks occurs by theinterplay between strain localization and viscosity variationsassociated with melt segregation. The band networks maintaina steady-state angle during shear by continuously pumping meltthrough the network. The development of strain partitioningin melt-rich networks will modify the energetics of meltingand melt transport by efficiently extracting melt and reducingeffective viscosity. KEY WORDS: melt transport; rheology; self-organization; strain localization; strain partitioning