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1.
辽西建平—宝国老太古宙变质岩建造金矿化带成矿潜力巨大,目前已发现金矿床(点)127处,但随着金矿开发力度及难度增大,急需寻求新的找矿突破。利用前人的地质、矿产、物探及化探等资料,建立了建平—宝国老太古宙变质岩建造金矿化带的空间数据库。重新建立了研究区金矿区域找矿模型,其中主要找矿标志包括新太古代变质深成岩、中生代中-酸性侵入岩、EW-NE-NNE-NW向断裂、Au-Ag-Cu-Pb-Zn-Mo化探异常、金重砂异常、已发现金矿床(点)。采用MRAS中的矿床综合预测模型,对研究区首次进行了基于GIS下的金矿产资源评价工作。据此圈定并优选出12处找矿靶区;并根据成矿有力度的不同由高到低划分为A、B、C 3级,其中A级找矿靶区7处,B级找矿靶区4处,C级找矿靶区1处。  相似文献   

2.
通过对西藏班-怒成矿带多龙矿集区的研究,提出了含矿花岗闪长斑岩的特征、构造与铜矿化体的关系、矿体围岩蚀变特征及找矿意义、矿体风氧化带特征、地层接触带与铜矿化的规律、铜矿化的物探异常特征、铜矿化的化探异常特征等8个成矿-找矿模型标志信息,组成找矿靶区定量预测数学模型的8个统计变量.针对区内地质工作基础较差的现实情况,将加权特征分析方法应用到多龙矿集区找矿靶区预测中,优选出10个具代表性的见矿钻孔,作为模型单元,对7个未知预测单元进行了定量预测,优选了找矿靶区.  相似文献   

3.
怀化地区金矿成矿研究程度低,为提高该地区研究级别,首次采用了基于MRAS的证据权重法对该地区金矿进行成矿预测。在充分收集、整理该地区各种地质、矿产、构造、物探、化探和遥感资料的基础上,建立怀化地区金矿多元地学空间数据库。在系统总结怀化地区金矿成矿规律的基础上,重建了该地区的金矿找矿模型,提取并构置了新元古代地层、断裂、航磁-60~0 n T、Au化探异常、Cu化探异常、Pb化探异常、Sb化探异常、Zn化探异常、岩浆岩、遥感推断环形构造、遥感推断线性构造、重力5~20 m Gal和30~55 m Gal、Au矿物重砂异常和其他矿物重砂异常等14个预测要素作为证据因子。预测网格单元划分采用2.5 km×2.5 km并进行了后验概率计算,根据后验概率计算值的分布特征将怀化地区的预测区块划分为A、B、C三个等级,并圈定了10个找矿靶区。根据找矿靶区的面积、已发现矿床(点)的数量和后验概率平均值等对找矿靶区进行了分级,最终将找矿靶区分为Ⅰ级找矿靶区4处,Ⅱ级找矿靶区3处,Ⅲ级找矿靶区3处。  相似文献   

4.
文章在构建张八岭隆起北段地质、地球物理和地球化学数据库的基础上,建立了较为详实的地质-地球化学空间信息结构模型;利用MORPAS3.0软件中常用的证据权重法,从地层、构造、岩浆、地球化学4个方面优选找矿标志,并开展了金矿找矿远景区预测和找矿靶区的优选。按照成矿地质条件的优劣程度、金矿床(点)的空间分布、金矿化的直接标志与间接标志、地质研究程度、示矿异常程度等因素的不同,把找矿靶区划分为3级8个区域。  相似文献   

5.
转变思维方式,将航磁数据改变成与化探数据相同的格式,应用多元统计分析方法建立基于物化探综合信息的区域Au找矿靶区定量预测模型。模型中航磁信息展现出优于Au元素的判别能力。以定量预测模型对全区各研究单元与已知有矿单元做相似程度判定,选择相似程度高的53个单元为一级找矿靶区(每个靶区面积25 km~2),其中18个(34%)靶区内有已知矿床(点)产出,认为,其余35个(66%)预测找矿靶区应该是寻找Au矿的有利区域。此结果不但改变了传统(定性)地质研究中认为,航磁成果对Au矿找矿靶区判定效果不佳的结论,同时更加充分说明,海量数据信息中隐藏着极大的潜能,只有转变思维方式,依据大数据的观念,应用定量研究的方法(用数学的方法研究地质问题)才能将其充分地挖掘出来。  相似文献   

6.
团结沟金矿外围十三公里区隐伏矿体预测   总被引:2,自引:2,他引:2  
通过团结沟金矿成矿背景与矿区地质的研究,建立了矿床综合找矿模型。对团结沟金矿外围十三公里区地质信息、高精度磁测信息、γ能谱信息及土壤地球化学信息的分析,确定了该区综合找矿信息特征,并进行隐伏金矿体预测。通过对比团结沟金矿床综合找矿模型,对异常区进行优选,并对优选出的靶区实施了工程查证,探槽及浅井双双见矿,共获得黄金资源量1.5t。隐伏金矿体预测效果显著,矿区外围有巨大的增储前景。  相似文献   

7.
郭君  高建国  李西  王瑞雪 《云南地质》2005,24(2):225-231
马关金矿集中区遥感图像显示线一环构造特征,运用数理统计的方法分析线性构造,并研究线一环构造特征与矿床(点)的分布关系,在综合分析地质、遥感、化探信息基础上,优选找矿靶区。  相似文献   

8.
陈俊  郑勇  高俊宝  肖忠 《新疆地质》2011,29(4):437-441
以现代成矿理论为指导,通过GIS平台,经数据综合分析,提取新疆北山黑山岭一带地质、化探、物探、遥感和矿产等多元找矿信息,确定本区成矿要素,圈定出7个找矿靶区.采用成矿要素加权法对靶区进行优选和分类,并对优选找矿靶区进行野外验证,发现多处金、铜、钒矿点.表明在该区进行多元找矿信息综合分析与找矿靶区优选是有效的,可为新疆北...  相似文献   

9.
青海北巴颜喀拉成矿带虽然总体研究程度低,但显示出巨大的找矿潜力,急需寻求新的找矿突破。利用前人的地质、矿产、化探等资料,建立了青海北巴颜喀拉成矿带基于GIS的空间数据库。在此基础上重新建立了研究区锑金矿区域找矿模型,其中主要找矿标志包括金水系沉积物异常、锑水系沉积物异常、砷水系沉积物异常、重砂异常、NW—NWW向线性构造和巴颜喀拉山群。采用作者提出的专家证据权重法,对研究区首次进行了基于GIS下的专家证据权重法矿产资源评价工作。据此重新圈定找矿远景区和找矿靶区,将后验概率大于0.001的区域作为找矿远景区,将后验概率大于0.005的区域作为找矿靶区;并依据找矿靶区内预测含矿区域后验概率二重积分大小,将找矿靶区的找矿潜力级别由高到低分别划分为A、B、C 3级,其中A级6处,B级10处,C级13处。  相似文献   

10.
为配合楚伊犁—西天山成矿带找矿研究,在伊宁县恰尔巴赫特铜矿区开展了激电扫面、高频大地电磁(EH4)探测和化探测量工作,物化探综合异常能准确反映矿(化)体和围岩在空间上的分布特征;进一步研究了斑岩型铜、金矿(化)体在该区空间分布上与岩体、围岩及构造的关系。利用上述综合勘查方法,圈定了新的隐伏矿(化)体,对优选出的找矿靶区进行查证,扩大了资源量。  相似文献   

11.
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.  相似文献   

12.
Robert L. Linnen   《Lithos》2005,80(1-4):267-280
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.  相似文献   

13.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

14.
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).  相似文献   

15.
《地学前缘(英文版)》2014,(3):I0001-I0003
正1 AIM AND SCOPE GEOSCIENCE FRONTIERS(GSF) is a bi-monthly international journal that publishes in English high quality original research articles and timely reviews in interdisciplinary fields of Earth and Planetary Sciences.GSF aims to bridge innovative,provocative and challenging concepts and models related to various fields of research including petrology and geochemistry in understanding lithospheric architecture  相似文献   

16.
正1 Introduction In the present paper,MgCl2·6H2O,FeCl3·6H2O,and CeCl3·6H2O were used as raw materials in the precipitationhydrothermal method to synthesize MgF eC e hydrotalcite.The effects of the Fe:Ce molar ratio on the composition,crystal structure,and thermal stability of hydrotalcite are examined.Energy-dispersive X-ray spectroscopy(EDS),X-  相似文献   

17.
正20141430 Chen Ji(Key Laboratory of Petroleum Resources,Chinese Academy of Sciences,Lanzhou 730000,China);Shi Ji’an Sedimentary Facies and Models for the Palaeogene-Neogene Deposits on the Northern Margin of the Qaidam Basin,Qinghai Province(Sedimentary Geology and Tethyan Geology,ISSN1009-3850,CN51-1593/P,33(3),2013,p.16-26,14 illus.,16 refs.)  相似文献   

18.
SEISMIC GEOLOGY     
正20141967An Zhanghui(Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,China);Du Xuebin Study onthe Geo-Electric Field Variation of Sichuan Lushan MS7.0and Wenchuan MS8.0Earthquake(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(11),  相似文献   

19.
GEOCHEMISTRY     
正20141357 Guo Tao(School of Mathematics and Science,Shijiazhuang University of Economics,Shijiazhuang 050031,China);Hu Jiawen Assessment on the New Pressure-Volume-Temperature(PVT) Data of Supercritical Water(Geological Journal of China Universities,ISSN1006-7493,CN32-1440/P,19(3),2013,p.447-455,9 illus.,3 tables,32 refs.)Key words:supercritical fluids  相似文献   

20.
正20141074Bao Xijie(Research Institute of Exploration and Development,Daqing Oilfield Company,PetroChina,Daqing 163712,China)Gather Optimal Processing and Application Effect of Prestack AVA Instantaneous Inversion  相似文献   

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