西藏劣布铜矿的基本特征及成因初探     

江化寨  江善元 《地质找矿论丛》2006,21(10):10-14

劣布铜矿为火山沉积喷流层控型铜矿床；矿体受比马组第四岩性段层位和角砾岩筒控制，容矿岩石为角岩、层夕卡岩和角砾岩，矿物组合简单，流体包裹体测试表明夕卡岩铜矿化形成深度小于典型的斑岩铜钼矿，显示矿床的剥蚀程度较低，对寻找斑岩型铜矿是有利的。  相似文献   

谱特征参数在评价激电异常源性质中的应用     

夏中广  王世权 《物探与化探》2006,30(6):525-528,532

从研究激电场频谱特征及充、放电时间特征出发,根据实验观测结果,总结了硫化物矿化体(黄铜矿)及含石墨白云质大理岩等岩性的频谱特征及充放电时间特征,探索到新的定性评价激电异常源参数——频率谱及时间谱、视衰减速度。实践证明,利用频率谱定性评价硫化物矿化体(黄铜矿)与含石墨白云质大理岩激电异常源取得较佳效果。  相似文献   

东营凹陷北带中段砂砾岩扇体高分辨率层序地层与沉积演化特征     

张永旺  高霞  邓宏文 《铀矿地质》2006,22(4):202-208,201

东营凹陷北带中段，主要指胜北-利津断裂带两侧，包括利津、宁海、胜北3个地区。文章涉及的研究对象主要为与北带砂砾岩扇体相关的地层，即沙四上亚-段沙三段。根据Cross（1998）的高分辨率层序地层学理论，笔者对区内沙四上亚-段沙三段进行了详细的层序地层研究。在连井剖面层序地层对比的基础上，建立了该区的高分辨率层序地层格架，并在此基础上，探讨了该区砂砾岩扇体的沉积演化特征和时空分布规律。  相似文献   

济阳坳陷断裂活动和CO₂气藏的关系研究          下载免费PDF全文

邱隆伟  王兴谋 《地质科学》2006,41(3):430-440

济阳坳陷在惠民凹陷和东营凹陷的地壳中各存在1个低速体,位于惠民凹陷上地壳底部的低速体是坳陷内已经发现火成岩的岩浆房以及CO₂的气体库。凹陷的边界断层在10~12km±的深度其倾角变得平缓,并以韧性剪切方式沿拆离带向下延伸。拆离带内岩石多为糜棱岩,在岩石圈上部巨大的压力作用下,呈现韧性状态的拆离带是良好的封盖层。由于拆离带的作用,沿岩石圈下部裂缝上升的岩浆和气体等在拆离带下部聚集而形成低速体。在地壳相对较稳定期,拆离带也处于较稳定阶段并起分隔作用;如果地壳发生拉分作用,则低速体也会随之发生暂时性破裂,从而导致低速体内的岩浆和气体运移、聚集和成藏。郯庐断裂是间接的成气断裂,埕南断裂及惠民凹陷内地幔隆起区上地幔及下地壳张性断裂是直接的成气断裂;高青—平南断层以及商店—平方王断层等为输气断裂;临邑—商河断层、林樊家断层和齐河—广饶断层等是有利的输气断裂。  相似文献   

'Gluttony or sloth': critical geographies of bodies and morality in (anti)obesity policy   总被引：1，自引：0，他引：1  

Bethan Evans 《Area》2006,38(3):259-267

In many countries, obesity is high on public health policy agendas, and geographical research has begun to engage with obesity. However, obesity is a highly contested term, and recent debates about geographers' engagement with policy, and critical discussions of the presence of bodies in medical geography, bear great relevance for developing a critical perspective on dominant 'obesity discourse'. Through a critical reading of a recent UK policy document, this paper considers the presence of bodies in (anti)obesity campaigns, calling for a more critical approach to the medicalization of body size to be central to future geographical work on obesity.  相似文献   

Geographies of embodied outdoor experience and the arrival of the patio heater     

Russell Hitchings 《Area》2007,39(3):340-348

Machines that provide people with nearby sources of outdoor warmth have become increasingly popular in the UK as a crop of mushroom-shaped technologies has started to spring up outside many public houses and private homes in this country. Yet this development has also received considerable condemnation from advocates of sustainable consumption, who have seemingly been disgusted by the societal self-indulgence that they see in these devices. Moving away from these more immediate forms of outrage, this paper enriches our understanding of their arrival by considering these heaters in terms of cultural conventions of thermal adaptation and the changing geographies that can be attached to them. Through these means, it is argued that a more nuanced understanding of why these technologies have become prevalent is produced and that an existing disciplinary interest in embodied outdoor experience is taken towards some important new spaces for study.  相似文献   

渤海湾盆地济阳坳陷北部石炭系—二叠系残留地层沉积^*          下载免费PDF全文

杨仁超  李阳  汪勇  李文厚  赵永福 《古地理学报》2021,23(3):525-538

渤海湾盆地济阳坳陷北部石炭系—二叠系残留地层为近年来该地区油气勘探的重点领域。为明确古潜山储集层沉积相带与砂体展布规律,在地层划分对比的基础上,依据测井曲线、沉积构造、岩性特征及沉积序列等资料,对济阳坳陷北部石炭系—二叠系古潜山区沉积特征进行了系统研究。结果发现: (1)古潜山区石炭系—二叠系残留地层厚度变化很大,石千峰组被剥蚀殆尽; (2)石炭纪—二叠纪研究区经历了海陆交互相→海陆过渡相→河流相的演化过程, 其中本溪组及太原组沉积时期研究区发育潟湖、潮坪及障壁岛相,山西组沉积时期发育三角洲相,以三角洲平原亚相为主,可识别出分流河道、分流河道间、天然堤及泥炭沼泽等微相,而上、下石盒子组沉积时期以辫状河沉积为主,可进一步划分为心滩、河床滞留沉积及泛滥平原微相; (3)受沉积环境演化的控制,本溪组—太原组的砂体呈斑块状展布,山西组和上、下石盒子组的砂体呈近北东—南西向条带状展布。对济阳坳陷北部潜山区沉积相与砂体展布规律的研究,为该古潜山区的油气勘探提供了关键地质依据。  相似文献   

曲流河道沉积演化过程与历史重建--以吉林油田扶余采油厂杨大城子油层为例     

单敬福  赵忠军  李浮萍  孙立勋  汤乃千  王博  高怀玺 《沉积学报》2015,33(3):448-458

高弯曲流单期河道内点坝内部侧积泥岩夹层所形成的天然渗流屏障是影响剩余油赋存的主控因素, 其单砂体内部薄夹层空间分布规模小、井间不易追踪对比、研究难度和所需资料要求程度较高等诸多不利因素, 制约着点坝砂体内部建筑结构的精细解剖。因此, 本文试图充分利用岩芯、测井、密井网等资料, 在废弃河道和点坝砂体的识别、恢复、河工参数的拟合和估算等基础上, 结合前人研究成果, 判别点坝侧积体的规模、倾向和倾角, 并以此为基础, 结合点坝地质概念模型, 从单一期河道内多个点坝中, 将属于同期的侧积体识别出来, 然后进行编号组合, 按照河道蛇曲化的规律进行过程分析和再现其沉积演化过程。这种方法实现了从成因过程学角度来解释点坝内部建筑结构及其空间叠置规律问题, 使河流相储层建筑结构分析不仅仅停留在结果层面, 而是注重从成因、过程视角去恢复和重建曲流河道历史演化过程, 使曲流点坝内部砂体建筑结构解剖结果将更合理、更可信, 并有效指导了油田中后期剩余油的预测和挖潜。  相似文献   

Very high spatial resolution optical and radar imagery in tracking water level fluctuations of a small inland reservoir     

《International Journal of Applied Earth Observation and Geoinformation》2015

Tracking water level fluctuations in small lakes and reservoirs is important in order to better understand and manage these ecosystems. A geographic object-based image analysis (GEOBIA) method using very high spatial and temporal resolution optical (Pléiades) and radar (COSMO-SkyMed and TerraSAR-X) remote sensing imagery is presented here which (1) tracks water level fluctuations via variations in water surface area and (2) avoids common difficulties found in using single-band radar images for water-land image classification. Results are robust, with over 98% of image surface area correctly classified into land or water, R² = 0.963 and RMSE = 0.42 m for a total water level fluctuation range of 5.94 m. Multispectral optical imagery is found to be more straightforward in producing results than single-band radar imagery, but the latter crucially increase temporal resolution to the point where fluctuations can be satisfactorily tracked in time. Moreover, an analysis suggests that high and medium spatial resolution imagery is sufficient, in at least some cases, in tracking the water level fluctuations of small inland reservoirs. Finally, limitations of the methodology presented here are briefly discussed along with potential solutions to overcome them.  相似文献   

华南地区构造–岩浆活化与热液铀成矿的分形动力学     

谢焱石  尹建文  谭凯旋  唐振平  段先哲  胡杨  王正庆  李春光  王昭昭  冯志刚 《大地构造与成矿学》2015,(3)

华南地区位于东亚壳体东南缘,包括东南地洼区和江南地洼区两个典型的华夏型地洼区,该区多阶段的复杂构造–岩浆演化形成了大量的花岗岩及断裂构造,并导致大量多因复成热液铀矿床的形成。这些花岗岩体、断裂构造及铀矿床的空间分布均具有分形特征。东南地洼区断裂构造的分维值为1.6800,明显大于江南地洼区的1.5939,显示前者更有利于热液铀成矿作用的发生。花岗岩体空间分布盒维数D总体上随其规模增大而增大,较大的周长–面积分形维数DPA会导致盒维数D增大,显示其构造–岩浆活动的复杂性增强。其中燕山晚期、燕山早期和印支期较大的D和DPA显示其更有利于热液铀成矿的发生。华南地区热液铀矿床空间分布盒维数为1.0254,明显小于两个不同构造区断裂构造空间分布的分维值,表明华南地区铀矿床的发育程度低于断裂。用元胞自动机模型对断裂和成矿演化进行模拟的结果表明,其分维值随时间逐渐增大,到中晚期断裂分维值增高至超过临界值后才有大规模成矿作用发生,成矿分维值显著增大。多阶段复杂的构造–岩浆活动的分形演化导致了华南地区多因复成热液铀成矿的分形分布。  相似文献