土屋-延东斑岩型铜(钼)矿床多源信息找矿模型   总被引：5，自引：2，他引：5       下载免费PDF全文

朱裕生  王福同  龙宝林  薛迎喜  肖克炎  冯京  庄道泽  姜立丰 《矿床地质》2003,22(3):287-294

为提高东天山铜镍成矿带内的矿产勘查效益，文章综合了区域成矿环境、矿床特征、地球物理场、地球化学场等成矿信息，尝试建立了土屋—延东斑岩型铜钼矿床的多源信息找矿模型。认为成矿带内铜矿资源远景良好，必将成为我国又一个铜矿资源潜力区。  相似文献   

STRUCTURAL CHARACTERISTICS OF THE NIUSHOU MOUNTAIN AND ITS GEOLOGICAL SIGNIFICANCE IN CENTRAL NINGXIA     

ZHANGJin MAZongjin RENWenjun LEIYongliang 《大地构造与成矿学(英文版)》2003,27(1):165-178

There are many thrust-related structures occurring in the Paleozoic strata of the Niushou Mountain in the central part of Ningxia Hui Autonomous Region. The fault-related folds are the typical structures in this area. Based on the analysis about these structures and their relationships, the processes by which these structures of the Miboshan Formation were formed are reconstructed, and the strata underwent about three stages of deformation: (1) horizontal shortening, (2) folding, and (3) thrusting. And the fact that the Niushou Mountain is the leading edge of an old thrust sheet was proved, the Niushou Mountain, the Daluo Mountain and the Xiaoluo Mountain together constitute the front part of this old thrust zone, so the Niushou Mountain and the Ordovician strata in the central and southern parts of Ningxia now are likely allochthons. In the period from middle Ordovician to Devonian, the areas of the central and southern Ningxia belonged to the back-arc foreland basin of North Qilianshan orogen, which was adjacent to the continent in the north. In the later part of the early Paleozoic period, the Niushou Mountain was formed after the closure of the back-arc foreland basin.  相似文献   

中国地震台网数字化改造的进展   总被引：12，自引：0，他引：12       下载免费PDF全文

刘瑞丰  吴忠良  阴朝民  陈运泰  庄灿涛 《地震学报》2003,25(5):535-540

介绍了九五期间（1996~2000年）中国地震台网数字化改造的进展和首都圈数字地震台网（1999~2001年）的建设情况，重点介绍了国家数字地震台网、区域数字地震台网和流动数字地震台网的台站分布、仪器配备和主要任务．   相似文献   

中国和日本梅雨锋区（个例）结构的比较     

侯定臣  庄小兰 《南京气象学院学报》1997,20(2):145-151

通过１９８２年梅雨期的个例分析，研究和比较了中国和日本梅雨我的结构。分析表明：１．梅雨锋区系统对流层上部宽广的斜压区和对流层低层较狭窄的弱斜压区共同组成；２．在两个个例中，中国剖面上锋区均呈“椅”型结构。日本剖面上，６月呈均匀倾斜结构，７月略呈“椅型”，涡度场上中国剖面为相当正压结构，日本剖面为斜压结构；３．梅雨锋区系统可民是均匀斜压区在不均匀和加热情况下结构改变结果；４．中国大陆雨区高层大量潜热  相似文献   

EFFECTS OF TROPOPAUSE AND POTENTIAL VORTICITY ANOMALY ON FRONTOGENESIS^*          下载免费PDF全文

Hou Dingchen  Gao Xuehao  Zhuang Xiaolan  Zhang Yong 《Acta Meteorologica Sinica》1997,11(4):446-459

A two-dimensional,semi-geostrophic numerical model incorporating the tropopause and stratosphere is used to investigate the effects of a positive potential vorticity anomaly and latent heat release on the frontogenetic process and the structure of the resulting frontal zone.It is demonstrated that(1) the inclusion of tropopause and stratosphere significantly changes the frontal structure only in the upper levels;(2) a clearly defined quasi-equivalent barotropic structure and a region of upward motion of finite width appear when a positive potential vorticity anomaly exists on the warm side of the maximum baroclinity in the lower troposphere,especially when it is located on the south edge of the baroclinic zone;(3) the above mentioned structure deteriorates as the frontogenesis proceeds in a dry atmosphere but can be maintained in a moist frontogenetic process with condensational heating;(4) the combination of a positive potential vorticity anomaly and the latent heat release is able to accelerate the frontogenesis significantly with the time needed to form an intense frontal zone reduced to less than 15 h.The results have significant theoretical importance in understanding the complex nature of frontal structure and frontogenesis,especially in understanding the dynamic structure of the subtropical frontal zone observed during early summer over East Asia.  相似文献   

QN—模型及其在覆盖区资源靶区预测中的应用     

陈永良  杜德文 《吉林地质》1997,16(3):51-56

本文把数量化理论Ⅲ与Ｑ－型非线性映射在机地结合在一起，定义了一种新的数学模型－ＱＮ－模型。详细地介绍了该模型的基本原理和计算步骤，给出了模型在覆盖区资源靶区以预测中应用的实例。  相似文献   

区域经济联系定量分析初探：以上海与苏锡常地区经济联系为例   总被引：49，自引：2，他引：49  

王德忠  庄仁兴 《地理科学》1996,16(1):51-57

针对目前区域联合日益广泛和经济联系量化研究不足的现状，在联系强度等方面提出一些新概念；阐述了经济联系量化指标的选取，建立了经济联系定量分析模型。  相似文献   

楚雄盆地有机质、膏盐与砂岩铜矿生成关系的有机地球化学证据与机理   总被引：8，自引：0，他引：8  

庄汉平  冉祟英  何明勤  卢家烂  刘金钟 《沉积学报》1996,14(3):129-138

云南楚雄中生代陆相盆地发育了良好的含煤、含铜和含膏盐的三位一体的建造组合。煤、膏盐和砂岩铜矿床中有机质在丰度、类型、成熟度、可溶有机质及生物标志物上既有一定差异，又有一定的相似性。煤和膏盐均参与了砂岩铜矿成矿作用，煤系为改造成矿作用提供了丰富的还原性有机质，膏盐提供了氧化性的ＳＯ２－４，间接提供了硫源。  相似文献   

鄂尔多斯西南缘前陆盆地沉降和沉积过程模拟   总被引：17，自引：8，他引：17  

刘少峰  李思田 《地质学报》1996,70(1):12-22

本文将东祁东逆冲带与鄂尔多斯西南缘晚三叠世前陆盆地相结合，研究了逆冲带内部变形特征，前陆盆地中层序地层格架特征及其反映的盆缘构造性质和幕式逆作作用。  相似文献   

楚雄盆地铜、盐、有机质相互作用与砂岩铜矿生成   总被引：13，自引：0，他引：13  

庄汉平  冉崇英  何明勤  卢家烂 《地质学报》1996,70(2):162-172

矿床的有机地球化学研究表明:楚雄盆地含煤、含铜和含膏盐建造中的有机质在来源、类型和成熟度上是不一致的。成岩期干酪根降解形成的短链羧酸是矿源层中铜活化的重要因素,石油烃是矿质搬运的重要载体。改造成矿期,天水淋滤膏盐展形成富SO_4~(2-)的下渗氧化性流体,为改造成矿提片供了硫源。另一方面,来自基底的含矿流体沿同生断裂上涌,混染煤系地层形成还原性流体,沿次级断裂进入到高渗透的砂岩储集层。当两种流体在砂岩中相遇时,发生氧化-还原作用而形成改造期矿体。  相似文献