大型矿山接替资源定位预测的途径及其研究意义   总被引：11，自引：2，他引：9  

邵拥军  彭省临  吴淦国 《矿产与地质》2005,19(1):16-18,65

讨论了大型矿山接替资源定位预测研究的重要性,并从理论上、技术上、经济效益上以及实践上对其可行性进行了分析;阐述了隐伏矿体定位预测的指导思想、技术路线、方法和基本途径。  相似文献   

安徽新桥块状硫化物矿床地球化学特征   总被引：6，自引：0，他引：6  

李红阳  李英杰  侯增谦  杨竹森  蒙义峰  曾普胜  徐文艺 《地质科学》2005,40(3):337-345

新桥块状硫化物矿床发育双层结构,地球化学特征也呈现出明显的“二元性”和垂向变化。下部网脉状蚀变矿化岩石SiO₂、Al₂O₃、K₂O和Na₂O等含量较高,上部层状块状矿石和含矿岩石Fe₂O₃、FeO、CaO、MgO及SiO₂等明显富集。稀土含量相对较低,上部层状块状矿层平均值为10.73×10^-6,下部通道相蚀变矿化岩石平均值为126.1×10^-6。重晶石δ³⁴S值为+16.2‰,硬石膏δ³⁴S值为+11.2‰,黄铁矿δ³⁴S值为+1.5‰～+4.7‰。含矿硅质岩δ¹⁸O为+12.0‰～+13.9‰,下部通道相含黄铁矿石英脉δ¹⁸O值为+13.3‰～+18.6‰。自下部网脉状矿化到上部层状块状矿层,从粗晶细晶到变胶状胶状黄铁矿,δ³⁴S、δ¹⁸O和δ30Si值逐渐降低,²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb平均值逐渐增高。  相似文献   

Theoretical controlled-source electromagnetic responses of fast-spreading mid-ocean ridge models     

M. E. Everett  R. N. Edwards 《Geophysical Journal International》1991,105(2):313-323

  相似文献   

Effect of an acid mine drainage effluent on phytoplankton biomass and primary production at Britannia Beach, Howe Sound, British Columbia     

Levings CD  Varela DE  Mehlenbacher NM  Barry KL  Piercey GE  Guo M  Harrison PJ 《Marine pollution bulletin》2005,50(12):158-1594

We investigated the effect of acid mine drainage (AMD) from an abandoned copper mine at Britannia Beach (Howe Sound, BC, Canada) on primary productivity and chlorophyll a levels in the receiving waters of Howe Sound before, during, and after freshet from the Squamish River. Elevated concentrations of copper (integrated average through the water column >0.050 mg l⁻¹) in nearshore waters indicated that under some conditions a small gyre near the mouth of Britannia Creek may have retained the AMD from Britannia Creek and from a 30-m deep water outfall close to shore. Regression and correlation analyses indicated that copper negatively affected primary productivity during April (pre-freshet) and November (post-freshet). Negative effects of copper on primary productivity were not supported statistically for July (freshet), possibly because of additional effects such as turbidity from the Squamish River. Depth-integrated average and surface chlorophyll a were correlated to copper concentrations in April. During this short study we demonstrated that copper concentrations from the AMD discharge can negatively affect both primary productivity and the standing stock of primary producers in Howe Sound.  相似文献   

The Cocos and Carnegie Aseismic Ridges: a Trace Element Record of Long-term Plume-Spreading Center Interaction   总被引：4，自引：0，他引：4  

HARPP  KAREN S.; WANLESS  VIRGINIA D.; OTTO  ROBERT H.; HOERNLE  KAJ; WERNER  REINHARD 《Journal of Petrology》2005,46(1):109-133

The aseismic Cocos and Carnegie Ridges, two prominent bathymetricfeatures in the eastern Pacific, record 20 Myr of interactionbetween the Galápagos hotspot and the adjacent GalápagosSpreading Center. Trace element data determined by inductivelycoupled plasma-mass spectrometry in >90 dredged seamountlavas are used to estimate melt generation conditions and mantlesource compositions along the ridges. Lavas from seamount provinceson the Cocos Ridge are alkalic and more enriched in incompatibletrace elements than any in the Galápagos archipelagotoday. The seamount lavas are effectively modeled as small degreemelts of a Galápagos plume source. Their eruption immediatelyfollows the failure of a rift zone at each seamount province'slocation. Thus the anomalously young alkalic lavas of the CocosRidge, including Cocos Island, are probably caused by post-abandonmentvolcanism following either a ridge jump or rift failure, andnot the direct activity of the Galápagos plume. The seamountshave plume-like signatures because they tap underlying mantlepreviously infused with Galápagos plume material. Whereasplume heterogeneities appear to be long-lived, tectonic rearrangementsof the ridge plate boundary may be the dominant factor in controllingregional eruptive behavior and compositional variations. KEY WORDS: mantle plume; mid-ocean ridge; Galápagos; abandoned rift; partial melting of the mantle  相似文献   

湖南江永铅锌矿床岩溶成矿构造系列及其演化   总被引：3，自引：0，他引：3       下载免费PDF全文

汪劲草  汤静如  彭恩生  常家良  雷衍国 《地质找矿论丛》2000,15(2):159-165

文章从解析已知矿体入手,认为江永铅锌矿床外接触带主矿体不是脉型矿体,而是岩溶型矿体。岩溶成矿构造受石磴子组中厚层灰岩控制。一组岩溶由两个岩厅组成,一个发育于２００～３２０ｍ标高,另一个发育于４００～５５０ｍ标高。根据近等距性原则,分别于已知岩溶型矿体（Ⅱ、Ⅲ）的南、北两侧预测了Ⅰ、Ⅳ及Ⅴ号岩溶组。建立了岩溶成矿构造系列、结构及坑睛鉴别标志,并探讨了岩溶的形成与演化。预测结论与物探激电异常结果吻合。  相似文献   

化工地质及矿山工作之回顾与前瞻     

陈元佩  王炳铨 《化工矿产地质》2000,22(1):1-4

建国 5 0年来 ,我国化工地质及矿山工作得到迅速发展 ,除钾之外 ,化工矿产资源基本保证了我国化肥和化工生产的需要。但与我国经济发展的需求相比 ,化工矿产资源及矿山生产建设仍存在着一些问题。面对新世纪 ,化工地质及矿山行业应围绕“两个转变”和“科教兴国”和“可持续发展”战略 ,制定适合自已的发展道路。要抓住机遇积极参与“国土资源大调查”工作 ,在确保新增磷、硫、硼等矿产资源量的同时 ,争取与泰国共同开发沙空那空盆地钾盐资源 ,以实现我国化工地质与矿山行业的可持续发展  相似文献   

煤矿塌陷地复垦还田生态重建研究--以抚顺煤矿为例   总被引：22，自引：3，他引：19  

刘景双  王金达  张学林  于君宝  严登华 《地理科学》2000,20(2):189-192

以抚顺煤矿为例,采用复垦还田与排矸相结合复垦高质量农田,轻可减少占用土地面积,又能在塌陷地复垦还田;同时也将剥离矸石等固体废物掩埋,防止环境污染,有利于保护环境,具有较大经济效益、神会效益和环境效益,为东北区乃至 全国类似矿区塌陷地复垦还田生态重建提供示范。  相似文献   

在AutoCAD中实现三维地层模拟的一种方法     

董云飞 《山西地震》2005,(3):3-5,16

以地层等高线和地质柱状图为建模基础信息,采用曲面样条函数进行插值计算地质曲面,并对AutoCAD进行二次开发,将二维抽象的等高线信息以三维可视化的图形效果在AutoCAD的图形窗口中直观形象地表示出来,为开采和规划决策提供依据.此方法可使煤矿主采区域、城市活断层探测以三维地层显示,对煤矿行业,地震活断层研究有一定的参考价值.  相似文献   

鹤岗煤矿矿震与区域天然地震活动相关性分析     

张凤鸣  于中元  许晓艳  杨文东  张世忠  张景生 《东北地震研究》2005,21(1):9-13

应用地震学方法，详细讨论了鹤岗矿震活动与区域天然地震的联系和区别。认为在东北地区第五个地震活跃期的影响下，在区域应力场和矿区构造应力场的作用下，鹤岗矿震活动明显增强。  相似文献