共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
<正> 一般认为,金陵组与上、下地层为假整合接触,金陵灰岩沉积后受到剥蚀,因而地表露头时断时续,残缺不全。1960年前后,我们在高骊山、栖霞山、伏牛山、青龙山等地工作时,获得的一些资料,与上述认识有些矛盾,现介绍如下: 相似文献
5.
6.
7.
江苏句容的高骊山为单面山(Cuesta,monoclinal mountain),是单斜构造上的山地。单面山的特征是山体沿岩层走向延伸,两坡不对称,一坡陡而短,一坡缓而长。 相似文献
8.
9.
11.
东河塘油田位于塔北隆起西部,其周缘多个构造带均获得油气,是一个重要的富油气区带,泥盆系东河砂岩和侏罗系地层是两套最为重要的储集层。原油主要来自于中、上奥陶统海相烃源岩,晚海西期和晚喜山期是两个重要的充注期,其中早期形成的油气藏普遍遭受降解破坏,现今发现的正常原油以晚期注入为主。侏罗系还包括晚喜山期库车坳陷生成的陆相油气的注入,白垩系卡普沙良群之下的不整合面是重要的油气运移通道,与之相接触的层位均有机会捕获陆相油气。综合油气地球化学特征与及横向、纵向地质对比,东河砂岩深部的奥陶系、志留系可成为潜在的勘探目的层,而东河塘地区侏罗系陆相油气的存在,进一步拓宽了塔北隆起陆相油气的勘探领域。 相似文献
12.
本文将华北板块和中亚-蒙古陆块缝合带中前人划分的"贺根山蛇绿岩套"划分为三个不同组分、不同成因的岩系:以含金刚石和其它幔源矿物的变质橄榄岩系为主,包括堆晶杂岩在内的镁铁-超镁铁岩系;含放射虫硅质岩夹层的玄武岩系;上覆的火山-沉积岩系。根据地质学与年代学证据,可以认为蛇绿岩形成于晚泥盆-早石炭世。在此基础上,本文重点讨论了三个问题:(1)结合不同尺度的构造研究,将含金刚石等幔源矿物的超镁铁岩看作源自地幔转换带的幔源熔-流体,在软流圈底辟体上涌的背景下持续上升,在板块对接的过程中构造侵位的岩石。据此,对现有的蛇绿岩概念提出了补充;同时提出贺根山在板块汇聚过程未发生明显的俯冲和碰撞,而是通过拼贴的方式连为一体的;(2)贺根山具有OIB特征的玄武岩与朝克山MORB的对比,表明不同来源的多地块的存在及板块闭合时间的差异均反映了陆间小洋盆的特征;(3)将上覆在玄武岩系之上的火山沉积岩系看作洋盆最后充填的产物,反映了古亚洲洋闭合过程中小洋盆直接从洋壳转化为陆壳的过程,最后从时空角度进一步讨论了小洋盆闭合的特征。 相似文献
13.
北京市城近郊区地下水的环境同位素研究 总被引:2,自引:1,他引:2
应用环境同位素方法,研究北京城近郊区地下水演化规律。沿北京市永定河冲洪积扇地下水流动方向取样15组(D、18O、T、14C及全分析),对所取水样进行D、18O、T、14C分析,并确定地下水同位素年龄。运用地下水14C和T含量在垂向和水平方向变化的结果,验证了地下水的流向并计算了地下水的流速变化范围为5·02~62·63m/a,从山前至平原浅层地下水径流速度逐渐变小,反映了地下水水平径流强度逐渐减弱,地下水交替逐渐变差;浅层孔隙水以垂向交替为主,深层孔隙水以水平径流为主。对地下水D、18O之间的关系进行分析,从而判断地下水的补给来源等。 相似文献
14.
The investigated rock material belongs to the group of upper cretaceous quader sandstones which are very important construction stones in Poland and Germany. The mineral composition of the rocks is relatively uniform??they are quartzose sandstones. The most important feature is their good workability and comparatively high weathering resistance. Still, regardless of the apparent resemblance, the observations carried on buildings and monuments show differences in weathering processes. The undertaken test was an attempt to verify the proposed before rock classification, performed on the basis of parameterization of porosimetric cumulative intrusion volume curves. The aim of the experiment was the evaluation of the sandstone petrography (including the structure, texture and porosity of the rock) influence on the weathering process. The modelling of accelerated weathering was conducted in Chamber for Ageing Acceleration, where some weather circumstances were simulated (insolation, rain and frost). As the result of the weathering experiment it could be stated that the dominant mechanism of the sandstones deterioration was granular disintegration and weight loss as a consequence of sample destruction. The most important factor influencing rock deterioration is rock texture, especially the character of grain contacts. The effective porosity is a requisite of potential for the stone to take in and hold water, and hence of resistance to weathering. In case of silica-cemented sandstones, the deciding criterion influencing weathering resistance is pore structure. In case of sandstones with clay cement, the most important is mineral composition of the rock. 相似文献
15.
A study of the serpentinisation in the Vempalle dolomitic limestones near Pulivendala,Cuddapah District 总被引:1,自引:0,他引:1
The calcite-dolomite ratio of the Vempalle dolomitic limestones, serpentinised dolomitic limestones, and serpentines from
the mineralised zone of the asbestos is determined by infrared spectroscopy. The ratio varies between 2 and 5·4 in the dolomitic
limestones, between 1 and 1·5 in the serpentinised dolomitic limestones and it is taken as zero in the serpentines as both
calcite and dolomite bands are absent in their infrared absorption spectra. The release of calcite during the serpentinisation
is identified, which confirms the formation of serpentine. 相似文献
16.
鄂尔多斯盆地北部下二叠系下石盒子组为纵横向变化大,岩性、孔隙结构等复杂的河流相地层,很难用统一的计算公式来完成对孔隙度的计算。采用多元统计分析、散点图和孔隙度对比图来确定其孔隙度。运用上述方法,比较精确地确定鄂尔多斯盆地北部下二叠系下石盒子组的孔隙度,对鄂尔多斯盆地油气储量的估计,提供一个很好的基础资料。 相似文献
17.
Jia Xia 《Engineering Geology》2005,78(3-4):209-214
The ancient gravel stratum near Nanjing, China, is a major stratum of Cenozoic age along the middle–lower reaches of the Yangtze River. This paper first presents a typical geological profile and material composition of the ancient gravel stratum, and then discusses its geologic origin, soil–rock-forming processes, engineering mechanical properties, and their relations. These analyses are useful for city planning, geotechnical engineering, construction, and characterization of the geological environment in the Nanjing area. 相似文献
18.
19.
西藏努日铜多金属矿床蚀变矿物的近红外光谱学研究 总被引:1,自引:0,他引:1
西藏努日大型铜多金属矿床蚀变作用强烈,主要蚀变类型包括绿泥石化、绢云母化、绿帘石化等。其中,绿泥石—绢云母类蚀变与深部斑岩体热液矿化作用密切相关。通过对20个钻孔岩心开展系统的近红外光谱测量,准确地鉴定了蚀变矿物类型、近红外性质,计算了样品白云母族矿物结晶度指数等,定量地研究了蚀变作用的强度。结果表明,绿泥石光谱波长值与铜钨钼矿化呈一定的正相关性,其中铁镁绿泥石与成矿关系密切;白云母族矿物光谱波长值与铜钨钼矿化呈一定的负相关性,其中钠云母与成矿关系明显;钠云母光谱结晶度指数越大,矿物形成温度越高,越接近含矿热液活动中心,矿化作用越强。在今后努日矿区深部寻找斑岩型矿床的找矿勘查中,应系统地开展近红外光谱测量,准确鉴别蚀变矿物、结合结晶度指数的指标来判断含矿热液活动中心,以指导勘查工程的布设。 相似文献