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《International Geology Review》2012,54(8):1048-1055
A study of the magnetic anomalies in the southeastern part of the Russian platform and its margins provides structural data on the crystalline basement. The area studied is divided into five provinces on the basis of the nature and intensity of the magnetic field. The sources of most of the anomalies are considered to occur in the upper part or top of the crystalline basement. As a result of the study current geological assumptions and hypotheses concerning the area are either corroborated or refuted. In some cases the magnetic data substantiate geologic and tectonic interpretations.--J. Lemish. 相似文献
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勉略阳三角区是陕西南部重要的多金属矿集区,瓦子坪测区位于勉略康构造混杂岩成矿带东段,银铅锌背景高,成矿物源丰富,地质条件有利。在全区1:2.5万土壤地球化学测量的基础上,采用多元统计方法,对Au、Ag、Cu、Pb、Zn、Co、As、W、Ni、Cr、P、Mn共12种元素进行研究,分析了地球化学特征参数、元素相关性、元素分布和单元素异常特征,总结了元素组合、富集贫化规律及其各单元元素与其地质背景的对应关系,结合区内成矿地质构造背景和已知矿点等信息,圈定了14处综合异常,优选出3个找矿靶区。通过对典型异常的查证工作,运用槽探工程进行揭露,在本区发现6条蚀变带,13条矿体,表明该方法在本地区具有良好的找矿应用价值。 相似文献
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鄂东南—赣西北地区构造异常及其控制矿意义 总被引：1，自引：1，他引：0
鄂东南－赣西北成矿区是长江中下游区域地质异常场中的一个局部地质异常区,其内构造地质异常有多种类型。基底断裂交切点附近岩石破碎,岩浆侵位和热液蚀变强烈,构成控制中深部大岩基及其上部矿田的基底断裂异常。盖层构造中纵向断裂异常带是多期次构造复合和叠加的产物,滑脱拆离断裂异常带是伸展体制下层间与层内构造剥离的结果。二对于浅成和超浅成的小岩体侵位及其伴生矿床（体）的形态、产状和分布有明显控制作用。褶皱异常对某些含矿岩体和矿体也有一定的控制作用。岩石的孔隙（裂隙）度异常是岩石对含矿流体渗透性和储集性的集中表现,它是成矿流体迁移和矿质富集的重要条件。综合构造异常反映多种构造因素对成矿制约的一种综合性变量,它能清楚地显示出构造与矿床产状和定位的关系。 相似文献
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流体地质填图是一种全新的地质调查及找矿方法。本次研究选择云南巍山－永平矿集区进行流体地质填图试验，研究了矿集区的控矿地质要素、各种主要的矿床（点）特征、成矿流体子系统及流域、流体的盐度与均一温度、流体的气液相成分、微量元素含量、稳定同位素特征及成矿流体的浓集中心。得到的流体地质图基本反映了本区成矿流体的性质与状态，反映了两个成矿流体子系统的基本特征，圈字了2个成矿流体子系统的流域范围及7个成矿流体浓集中心。这些浓集中心与已知矿化点分布、化探异常及有利的地质条件基本吻合，成为该区进一步找矿预测的重要依据之一。本项目的实践表明，流体地质填图不失为一种有效的找矿手段。 相似文献
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On the basis of gravity data, derived anomaly traces were presented for the interpretation of some shallow structural features of Biga and Gelibolu peninsulas. Since building general understanding of subtle details about subsurface geology is of great importance considering that the study area is tectonically important, some advanced data processing techniques were implemented to gravity anomalies in a detailed manner. The procedures were performed using a MATLAB-based software package (Gravity and Magnetic Interpretation – GMINTERP). First, a finite element method was utilised to produce the residual data-set which is expected to reflect short wavelength anomalies arising from shallower geological structures, and thereafter some derivative-based algorithms were executed to analyse the residual data. The general anomaly patterns obtained from the applications clearly corresponded to the well-known surface geology map of the study area. Derivative-based anomaly maps put forward some findings about the existence of an old caldera structure in the western part of the Biga Peninsula. Additionally, abrupt lateral changes in anomaly amplitudes indicated the presence of some major structural discontinuities. Thus, findings yielded to make significant geological interpretations that might be important for further investigations. This study also showed that GMINTERP software package proved useful in assisting geological interpretation using geophysical potential field data-sets. 相似文献
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航磁梯度资料在金矿地质填图和成矿预测中的应用 总被引：3，自引：0，他引：3
通过对冀东和冀北地区大比例尺（１：２５０００）航磁梯度资料的分析研究发现，航磁梯度与常规的航磁总场相比，在金矿地质填图中可以更准确地划分不同地层分界、确定火成岩的分布范围以及断裂构造带的平面位置等。总结了金矿床上航磁梯度异常的变化规律。最后，利用包括航磁梯度在内的综合航空物探信息，对冀东渠子地地区进行了金矿预测研究，取得了较好的地质效果。 相似文献
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Migration of Depocenters and Accumulation Centers and its Indication of Subsidence Centers in the Mesozoic Ordos Basin 总被引：3，自引：2，他引：1
Based on the integrated study of structure attributions and characteristics of the original basin in combination with lithology and lithofacies, sedimentary provenance analysis and thickness distribution of the Mesozoic Ordos Basin, it is demonstrated that the depocenters migrated counterclockwise from southeast to the north and then to the southwest from the Middle-Late Triassic to the Early Cretaceous. There were no unified and larger-scale accumulation centers except several small isolated accumulation centers before the Early Cretaceous. The reasons why belts of relatively thick strata were well developed in the western basin in several stages are that this area is near the west boundary of the original Ordos Basin, there was abundant sediment supply and the hydrodynamic effect was strong. Therefore, they stand for local accumulation centers. Until the Early Cretaceous, depocenters, accumulation centers and subsidence centers were superposed as an entity in the southwest part of the Ordos Basin. Up to the end of the Middle Jurassic, there still appeared a paleogeographic and paleostructural higher-in-west and lower-in-east framework in the residual basin to the west of the Yellow River. The depocenters of the Ordos Basin from the Middle–Late Triassic to the Middle Jurassic were superposed consistently. The relatively high thermal maturation of Mesozoic and Paleozoic strata in the depocenters and their neighborhood suggest active deep effects in these areas. Generally, superposition of depocenters in several periods and their consistency with high thermal evolution areas reveal the control of subsidence processes. Therefore, depocenters may represent the positions of the subsidence centers. The subsidence centers (or depocenters) are located in the south of the large-scale cratonic Ordos Basin. This is associated with flexural subsidence of the foreland, resulting from the strong convergence and orogenic activity contemporaneous with the Qinling orogeny. 相似文献
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ZHAO Junfeng LIU Chiyang WANG Xiaomei ZHANG Can Chemistry Postdoctoral Program of Northwest University Xi'an Shaanxi China State Key Laboratory of Continental Dynamics Northwest University China 《《地质学报》英文版》2009,83(2)
Based on the integrated study of structure attributions and characteristics of the original basin in combination with lithology and lithofacies,sedimentary provenance analysis and thickness distribution of the Mesozoic Ordos Basin,it is demonstrated that the depocenters migrated counterclockwise from southeast to the north and then to the southwest from the Middle-Late Triassic to the Early Cretaceous.There were no unified and larger-scale accumulation centers except several small isolated accumulation c... 相似文献
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Identifying geochemical anomalies from background is a fundamental task in exploration geochemistry. The Gangdese mineral district in western China has complex geochemical surface expression due to complex geological background and was chosen as a study area for recognition of the spatial distribution of geochemical elements and separating anomalies from background using stream sediment geochemical data. The results illustrate that weak anomalies are hidden within the strong variance of background and are not well identified by means of inverse distance weighted; neither are they clearly identified by the C–A method if this method is applied to the whole study area. On the other hand, singularity values provide new information that complements use of original concentration values and can quantify the properties of enrichment and depletion caused by mineralization. In general, producing maps of singularities can help to identify relatively weak metal concentration anomalies in complex geological regions. Application of singularity mapping technique in Gangdese district shows local anomalies of Cu are not only directly associated with known deposits in the central part of the study area, but also with E–W and N–E oriented faults in the north of the study area. Both types of anomalies should be further investigated for undiscovered Cu mineral deposits. 相似文献
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通甸地区地处三江特提斯兰坪盆地铅-锌-铜-银巨型矿集区东北部,具有寻找沉积岩型铅锌矿的前景。在通甸地区开展了1∶5万水系沉积物地球化学测量,以进一步指导铅锌矿勘察工作。确定了Pb、Zn和Ag等15种单元素异常范围,揭示了不同成因类型组合元素的分布特征及规律,圈定了21处地球化学综合异常。通过化探异常查证,识别出两条铅锌矿(化)体,经分析检测,Pb含量为1.93%～2.01%,Zn含量为0.48%～12.22%。研究表明,三合洞组(T3sh)碳酸盐岩和与其上下地层接触部位是区内重要的矿源层。结合异常分布规律、异常查证结果以及成矿地质背景进行综合评价,优选AS05甲1综合异常区为最佳铅锌找矿靶区,为通甸地区深入开展矿产勘查提供参考和依据。 相似文献
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基于土壤氡气测量识别甘肃北山南缘隐伏断裂 总被引：1，自引：0，他引：1
我国高放废物地质处置库首选预选区位于甘肃北山南缘，区内分布有多条大型非活动断裂构造，这些断裂很可能成为未来放射性核素迁移的主要通道。断裂在向地表延伸过程中，受第四系覆盖等因素影响，造成关键构造部位隐伏地下而难以识别。本文以北山地区新场地段南部红旗山和前红泉断裂为研究对象，采用土壤中氡气测量方法，探讨了大型断裂构造中隐伏段落的识别及其指示的水文地质意义。结果表明：土壤中氡气测量对于识别北山南缘隐伏断裂具有很好的指示意义，是传统地质调查方法的一种重要补充；红旗山和前红泉断裂裂隙系统整体开启性均较差，裂隙系统不发育，影响范围较小，不具备形成较大规模储水空间的可能性。不同断裂带土壤氡浓度背景值差异较大，可根据土壤氡浓度累积频率分布图确定背景值；土壤氡浓度等值线分布图对判断隐伏断裂位置具有一定的指示作用。对于压剪性断裂而言，主断裂多沿氡气高异常与低异常边界分布或表现为氡气中等异常，而两侧的次级断裂表现为氡气高异常。 相似文献
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湘桂粤赣地区是我国锡多金属矿产资源集中分布区之一.系统地研究了锡多金属矿床区域成矿地质条件,深部构造坳陷带及其边缘变异带控制矿床的空间分布;赋矿地层具成矿物质初始富集特征,火山作用和海底喷流作用是造成成矿物质初始富集的重要因素.首次划分出9条构造—岩浆岩带14条元素组合分带,总结了各带的发育特征及控矿作用.指出以Sn W为主的元素组合带是重要锡多金属矿床产出的部位. 相似文献
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航空重力局部异常地质成因分类及找矿意义 总被引：2，自引：0，他引：2
以我国首次试验的航空重力数据为基础,通过局部重力异常的突出方法处理和反演拟合,结合航磁、地震、钻井等资料,按照引起局部异常的地质体性质,将研究区的局部重力异常划分为6类,即与基岩凸起有关的局部异常、与基岩凹陷有关的局部异常、与侵入岩有关的局部异常、与喷出岩有关的局部异常、与中酸性岩浆岩中老地层有关的局部异常、与深部地幔柱有关的局部异常.每类局部异常又可根据具体的地质体属性划分为若干种局部异常,并构成某种矿产资源的反映.其中,基岩凸起异常、基岩凹陷异常、岩浆岩体异常分别构成油气田、煤田、金属矿床的重要找矿标志.正确认识局部重力异常及其成因,是航空重力地质资源调查的目标之一,具有重要的找矿意义. 相似文献