金的活动态分析方法及其应用

在金相态分析方法的基础上,对金活动态分析方法进行了如下改进:用5 μm孔径的滤膜取代2 μm孔径的滤膜抽滤;将加入提取剂溶液提取黏土吸附相、有机结合相和铁锰氧化物相改为直接加入固体提取剂;将泡沫塑料吸附-原子吸收法改为甲基异丁基酮(MIBK)萃取-原子吸收法测定金。介绍了改进后的金活动态分析方法及其在东北高寒森林覆盖景观某金矿区的一个应用实例。结果表明,除水提取相异常相对不明显外,其余3个相在矿体上方均有清晰、明显的异常指示。其中有机结合相的异常强度最大,是在该景观条件下寻找隐伏矿的最有利相态。重复样分析的相对误差小于50%,满足金的活动态分析要求。     

基于短信平台的地震速报发布实现方法

研制了地震信息基于手机短信息发布软件，实现了在进行网络速报的同时，进行短消息的自动发布。本文介绍了手机短消息的软硬件实现方法，并实例介绍了PDU串的具体格式和编码的实现方法。     

关于手持GPS测定活断层位置中求解坐标系统转换参数的问题

测定活断层的坐标、绘制活断层空间位置分布图,是城市活断层探测的一个重要目的。手持GPS可以方便、快捷的测定目标点的WGS-84坐标,测量精度也满足1∶1万地形图的要求。本文介绍如何求解系统转换参数,将WGS-84坐标转换为我国目前使用的是1954年北京坐标系或1980年国家大地坐标系。进而可以利用GIS技术建立活断层信息管理数据库系统。     

基于PDA的移动导航系统的动态标注

动态标注是移动导航系统传达导航信息的一个重要方面。针对PDA移动导航系统的特点,围绕如何在导航过程中正确、高效地进行地图动态标注这一问题进行了研究。对于点状地物,提出了一种基于格网整体规划,分块注记的方法;对于线状地物,提出了拆分注记文本、投影标注的方法。该方法能够有效地避免注记压盖和信息缺损等现象,同时还能保证在PDA导航过程中实时、高效地进行动态标注。保证了地图显示的可读性和美观程度,同时也保持了地图浏览的流畅性。     

超高压变质岩的全球分布与地球演化节律

高压、超高压变质作用不是一个局部的孤立的地质现象，而是一个时空跨度大、范围广、影响构造观的重要科学问题。文中讨论了世界上三类（１３个）典型超高压变质地区的地质学岩石学特点，从全球构造的角度研讨了超高压变质的时空分布，从而得到下列认识：（１）所有高压、超高压变质岩均分布于全球活动带及其次级褶皱带内，超高压变质岩常常保存于多期变质和变形的基底片麻岩块体中，与深位壳型剪切带关系密切。（２）现有的年代学资料说明大部分超高压变质带出现于显生宙不同时代的褶皱带（造山带）内。（３）超高压变质演化的多阶段性，说明了地球从收缩到膨胀的节律现象。（４）从欧亚大陆范围看来，从北而南，从陆到洋超高压变质有逐渐变新的趋势，可能说明欧亚大陆从中生代以来，有从大陆向大洋方向增生的总趋势。     

无机离子（Ni，Ge）和烷化剂对DNA Tm值的影响

在实验室条件下，选择几种有代表性的无机离子（包括宏观生命元素、微量生命元素、副生命元素），并保持一定的浓度和ＰＨ值（６．１８±０．２），研究了各无机离子和烷化剂对ＤＮＡＴｍ值的影响。结果表明，有益元素与有害元素对ＤＮＡＴｍ值高低的影响明显不同。前者使Ｔｍ升高，抑制ＤＮＡ热变性，后者使Ｔｍ值降低，促进ＤＮＡ热变性；这并非阴阳离子的离子强度造成的，而是由于加入的无机离子对ＤＮＡ分子中磷酸基因和碱基的作用不同所致。而且它们对ＤＮＡＴｍ值的影响幅度和方向与烷化剂的存在有很大关系。烷化剂可以大大降低Ｔｍ值，加入各种无机离子对烷化作用产生不同的影响。这表明，作为致癌的主要机理—烷化作用可能与各种离子的存在和在生物体内的平衡状态有关。所测结果还表明，烷化剂的作用比无机离子大得多。这些结果有助于区分有害与有益元素，对癌症的早期发现及阐明致癌、防癌机理有重要意义。     

Geochemical evidence for contribution of ore-forming materials from peraluminous granite basement —— Taking Fucheng pluton and No. 6722 uranium deposit in southern Jiangxi Province as examples

Source of ore-forming material is always one of the fundamental subjects in the study of mineral deposits. Recently, in order to probe deep sources of ore-forming materials, many interna-tional and Chinese investigators have paid much attention to the rel…     

A magnetotelluric study of the Damara Belt in Namibia: 1. Regional scale conductivity anomalies

The Namibian margin is dominated by the late Proterozoic to early Cambrian fold belts of the Damara Orogen, which wrap around and separate the Congo and Kalahari Cratons. This mosaic of relatively ‘soft’ fold belts and ‘hard’ cratons apparently controlled the path for the opening of the South Atlantic in the early Cretaceous. The continents split along the coast-parallel fold belts of the Damara Orogen while the inland fold belt (Damara Belt) was effected by extension and widespread igneous intrusion but never developed to the rift stage. This paper is concerned with the interpretation of magnetotelluric (MT) data along a 200 km NW-SE profile across the Damara Belt in NW Namibia. The regional, two-dimensional electrical resistivity model and the induction vector data exhibit three distinctive zones: (i) a generally very resistive upper crust which is typical for the granites and metasediments of the Damara Belt, (ii) two subvertical conductors in upper to mid-crustal levels which correlate with major tectonic zone boundaries and (iii) a highly conductive middle to lower crust in the southern part of the profile. The geometry of the conductive structures could reflect a regional shear system in which upper crustal listric faults pass into a detachment zone in the middle crust. We interpret the high electrical conductivity in terms of graphite (or other forms of mineralization) enrichment along the shear planes. This zone of crustal weakness may have originated in Pre-Damara times and had probably experienced several episodes of crustal reactivation before the intrusion of basaltic dike swarms during the Cretaceous rifting and magmatism associated with the opening of the South Atlantic.     

Copper–gold occurrences in the Palaeoproterozoic Inglefield mobile belt, northwest Greenland: a new mineralisation style?

Inglefield Land in northwest Greenland is an ice-free 7000 km² region underlain by the Palaeoproterozoic Inglefield mobile belt, composed of quartzo-feldspathic gneisses, meta-igneous and supracrustal rocks. These rocks are unconformably overlain by an unmetamorphosed cover of sedimentary and igneous rocks of the Mesoproterozoic Thule Basin and the Lower Palaeozoic Franklinian Basin. Mineralisation in Inglefield Land is characterised by a copper–gold metal association that can be classified in terms of the hosting rocks, namely: garnet–sillimanite paragneiss-hosted, orthogneiss-hosted and mafic–ultramafic-hosted. The paragneiss-hosted mineralisation, the topic of this paper, is essentially confined within a NE-trending structural corridor and consists of bands of sulphide±graphite-bearing, hydrothermally altered, quartzo-feldspathic gneiss, called “rust zones”. These are commonly parallel to the paragneiss main foliation, suggesting a close relationship. The rust zones have strike lengths from a few metres to more than 5 km, and widths ranging from a few centimetres to 200 m. Sulphides mainly include pyrrhotite, pyrite and chalcopyrite. The sulphides form disseminations, up to 30% by volume, but in places they form massive pods or lenses up to 20–30 m, and about 0.1–0.5 m wide. Graphite contents are up to 5 vol.%. Rust zones typically consist of a quartz–plagioclase mosaic associated with a late generation of red-brown biotite, sericite, chlorite and epidote. Mylonitic or cataclastic textures are locally recognisable. XRD analyses of graphite indicate temperatures of between 650 and 700 °C. Sulphur isotope analyses show δ³⁴S values ranging from −6.2‰ to +9.3‰.An ore genesis model is proposed in which the Palaeoproterozoic precursor sandstone–carbonaceous shale succession is polydeformed and polymetamorphosed to granulite facies quartzo-feldspathic and pelitic gneisses, with transposition of layering to axial plane of folds, followed by ductile shearing and mylonitisation, from which future rust zones were derived. The mylonitic zones were infiltrated by fluids, whose origin can be ascribed to deep-penetrating surface waters and/or external brines. In our ore genesis model, we envisage that brines derived from the overlying Lower Palaeozoic Franklinian succession infiltrated the basement into the structural channels provided by the shear/mylonitic zones. At the regional scale, this infiltration was facilitated by a NE-trending corridor, postulated to be a deep structure.     

移动地图及制作探讨

介绍了移动地图的概念和移动通信设施的类型，指出显示器的尺寸、信息获取的实时特征要求，能够运用活动表征和自动综合，为用户显示不受干扰的重要信息，阐述了移动地图制作过程中信息处理的面向对象的数据库技术、目标信息的互操作、活动目标综合方法和智能体综合方法。