共查询到20条相似文献，搜索用时 218 毫秒
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《Scientia Geologica Sinica》1997,(1)
ＧＥＯＬＯＧＩＣＡＬＥＶＩＤＥＮＣＥＯＦＭＵＵＳＤＥＳＥＲＴＶＯ－ＬＵＴＩＯＮＳＩＮＣＥ０．５ＭＡＢ．Ｐ．TXＧＥＯＬＯＧＩＣＡＬＥＶＩＤＥＮＣＥＯＦＭＵＵＳＤＥＳＥＲＴＥＶＯ┐ＬＵＴＩＯＮＳＩＮＣＥ０．５ＭＡＢ．Ｐ．ＳｕｎＪｉｍｉｎ，ＤｉｎｇＺｈｏｎ... 相似文献
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《Scientia Geologica Sinica》1997,(1)
ＤＩＳＴＲＩＢＵＴＩＯＮＯＦＧＯＬＤ－ＢＥＡＲＩＮＧＱＵＡＲＴＺＶＥＩＮＩＮＦＩＶＥＧＯＬＤＤＥＰＯＳＩＴＳＡＮＤＡＶＯＲＴＥＸＭＥＴＡＬＬＩＺＡＴＩＯＮTXＤＩＳＴＲＩＢＵＴＩＯＮＯＦＧＯＬＤ┐ＢＥＡＲＩＮＧＱＵＡＲＴＺＶＥＩＮＳＩＮＦＩＶＥＧＯＬＤ... 相似文献
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同步辐射X射线近边吸收谱法研究——二元金属重整催化剂中铂和铼的化学态 总被引：3，自引：0，他引：3
北京同步辐射装置（ＢＳＲＦ）提供同步辐射（ＳＲ）可调单色光，用Ｘ射线近边吸收谱法测得Ｆｅ３＋～Ｆｅ０和Ｎｉ３＋～Ｎｉ０的Ｋα吸收边能量位移分别为１０ｅＶ；Ｐｔ（Ⅳ）～Ｐｔ０的ＬⅢ吸收边能量位移为２ｅＶ；Ｒｅ（Ⅳ）～Ｒｅ０和Ｒｅ（Ⅶ）～Ｒｅ０的ＬⅢ吸收边能量位移分别为３ｅＶ和４ｅＶ，其化学位移测量的标准偏差为±０５１ｅＶ（２σ）。 相似文献
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《Scientia Geologica Sinica》1997,(2)
ＴＩＤＡＬＦＬＡＴＳＴＯＲＭＤＥＰＯＳＩＴＳＯＦＭＩＤＤＬＥＣＡＭＢＲＩＮＩＮＳＨＩＭＥＮＤＩＳＴＲＩＣＴ，ＨＵＮＡＮＰＲＯＶＩＮＣＥTXＴＩＤＡＬＦＬＡＴＳＴＯＲＭＤＥＰＯＳＩＴＳＯＦＭＩＤＤＬＥＣＡＭＢＲＩＡＮＩＮＳＨＩＭＥＮＤＩＳＴＲＩＣＴ，ＨＵ... 相似文献
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综合利用多巅升机电磁法和甚低频法数据，探明多种类型的喀斯特构造，并评估它们的连通性是可行的。只要喀斯特构造的某些单元具有导电性，多频电磁法就能探测出其构造特征。这种导电性可能源于与落水洞穴有关的洼地上的厚层潮湿土壤，洞穴中的导电流体，或洞穴中占据一定比例的导电性沉积物。多线圈装置形式也能增强探测喀斯特构造特征的可靠性。初步证据显示：总场ＶＬＦ测量还可能探测出充满水和沉积物的喀斯特构造通道。但无论是 相似文献
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《Scientia Geologica Sinica》1997,(2)
ＡＰＰＬＩＣＡＴＩＯＮＯＦＷＡＶＥＧＥＯＬＯＧＹＴＯＢＡＳＩＮＡＮＡＬＹＩＳＯＦＨＵＡＮＧＨＵＡＤＥＰＲＥＳＳＩＯＮTXＡＰＰＬＩＣＡＴＩＯＮＯＦＷＡＶＥＧＥＯＬＯＧＹＴＯＢＡＳＩＮＡＮＡＬＹＳＩＳＯＦＨＵＡＮＧＨＵＡＤＥＰＲＥＳＳＩＯＮＺｈａｎｇＹｉ... 相似文献
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《Scientia Geologica Sinica》1997,(4)
ＳＥＤＩＭＥＮＴＡＲＹＥＮＶＩＲＯＮＭＥＮＴＳＡＮＤＣＯＡＬＡＣＣＵＭＵＬＡＴＩＮＧＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＹＩＭＡＣＯＡＬＦＩＥＬＤ，ＨＥＮＡＮＷａｎｇＹｕｎｑｕａｎＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ，ＧｕａｎｇｚｈｏｕＮｏｒｎａ... 相似文献
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《Scientia Geologica Sinica》1998,(1)
ＰＡＬＥＯＫＡＲＳＴＩＦＩＣＡＴＩＯＮＡＮＤＲＥＳＥＲＶＯＩＲＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＬＯＷＥＲＯＲＤＯＶＩＣＩＡＮＤＯＬＯＭＩＴＥＩＮＴＨＥＮＯＲＴＨＯＦＴＡＲＩＭＢＡＳＩＮ,ＸＩＮＧＪＩＡＮＧＣｈｅｎＨｏｎｇｄｅ,ＺｈａｎｇＪｉｎ... 相似文献
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本文利用遥感图像解译、地质调研和物探等技术手段，对甘肃疏勒河断裂带中段的地质特征及其稳定性进行了研究。通过研究，对疏勒河断裂带的认识有了新的进展，取得了较好的效果。 相似文献
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伸展断层传播褶皱是伸展环境中重要的一种褶皱类型,是由于隐伏基底正断层活化向上传播而引起上覆地层发生的弯曲。多年的研究认为这是一种向上变宽的三角形分布式剪切调节过程,断层的上端点限定了三角剪切区的顶点。运用三角剪切的速度模型很好地拟合和描述变形区内物质的运动,三角剪切区的顶角和断层向上传播/断层向下滑移比值（p /s）是控制伸展断层传播褶皱变形过程和几何形态的重要的运动学参数。伸展断层传播褶皱的发育过程可以根据断层是否切穿上覆盖层而划分为两个阶段。在沉积过程中,伸展断层传播褶皱作用对生长地层的几何形态和叠置样式有较强的控制作用。通过对保留的生长地层几何形态的分析,可以确定隐伏基底断层的初始破裂点和断层传播量,并最终重建伸展断层传播褶皱的变形过程。 相似文献
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青海省都兰县热水乡温泉地区具有较好资源潜力,陆续发现铅、锌、银、钼等多金属矿化现象。本文基于在该区开展1∶1万高精度磁测工作,对磁异常进行处理,推断区内断裂分布,并预测铅锌矿、钼矿等有利区。结果表明：区内有一级断裂3条,二级断裂41条;一级断裂控制地层展布及岩体分布,二级断裂控制地层局部分布和部分岩体分布,并为岩脉侵入通道。该区北部等轴状低缓中等磁力异常区可能为较大规模隐伏花岗闪长岩,此岩体与围岩接触部位是寻找铅锌矿化的有利区。研究区南部已发现的钼矿化带位于侏罗纪钾长花岗岩之中,呈现明显高磁异常,沿NW向断裂带边部的6处异常区为钼矿远景区。研究区中部沿一级断裂F1存在隐伏的侏罗纪钾长花岗岩,岩体侵入为热水提供热源,断裂为热水运移通道,靠近察汗乌苏河的隐伏岩体附近为地热有利区。 相似文献
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Landslides are very common in high-altitude Himalayan terrains. Major roads in the Himalayas are frequently blocked due to
heavy landslides and remain closed for long periods of time. Permanent mitigatory solutions to these landslides are required
to keep the highways open. Lanta Khola, located 71.2 km north of Gangtok (capital of the Indian state of Sikkim), is one of
the oldest landslides on the North Sikkim Highway and is active since 1975. The rock types on either side of the landslide
are different (augen gneiss in the east and metapelitic schist in the west), and it is believed that the Main Central Thrust
passes through the slide zone. Since the slide is invariably activated in the aftermath of heavy rainfall, it is important
to identify the subsurface structures that channel water below the landslide surface in order to understand the triggers of
slide activity. This can only be accomplished by geophysical survey; however, an appropriate geophysical technique that can
be applied in such terrains must be identified. Very low-frequency (VLF) electromagnetic survey was performed over the Lanta
Khola landside in order to delineate subsurface structures. Although a very limited number of VLF transmitters are available
worldwide, it was possible to pick up VLF signals from a number of VLF stations even in this high-altitude mountainous terrain.
VLF measurements along five profiles perpendicular to the geological strike were recorded, and a high conducting zone was
delineated from the VLF observations. This conducting zone correlates with the low resistive zone identified from gradient
resistivity profiling. The anomalies confirm that there is a water-saturated zone (soggy zone) even in the subsurface of the
slide parallel to the geological gneiss–schist contact within the Lanta Khola slide. This indicates that the conductive feature
correlates with a weak water-saturated debris layer that lies along the slide and is parallel to the geological contact. Resistive
structures on either side of the landslide zone can thus be correlated with the stable ground. It is necessary to drain out
water from the soggy zone to minimize slide activity since this zone appears to penetrate into the body of the slide. 相似文献
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地质雷达探测以其分辨率高、定位准确、快速经济、灵活方便、剖面直观、实时图像显示等优点,成为地质调查中广泛使用的一种探测方法。本次宁夏青铜峡地区1∶5万新构造与活动构造区填图中运用地质雷达探测技术对第四系和隐伏断层进行了探测。结果表明,40 MHz地质雷达可以有效地探测地表以下30 m内的第四系结构,可清晰地识别出3套第四纪地层。这一地层结构划分被第四系浅钻证实,其为第四系全新统灵武组,自下而上由泥岩、砂砾石层和含砾的砂或泥等3套地层组成。对测区主干断裂——柳木高断裂南段的地质雷达探测表明,断裂带表现为近地表发散向下汇聚的正花状结构,这与探槽揭露的特征一致,表明地质雷达探测可以准确标定隐伏断层平面位置与垂向精细结构。本次宁夏地质填图证实,地质雷达技术是浅覆盖活动构造区进行隐伏断裂调查和第四纪地层层序划分的可行、高效、便捷的技术方法之一。 相似文献
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福建建阳井后钼矿地质特征及成因探讨 总被引：1，自引：0，他引：1
建阳井后钼矿位于闽西北隆起带东缘,浦城一永泰南北向构造岩浆活动带中部。矿床形成于燕山晚期,主要受区域上南北向断裂构造带控制的隐伏斑岩体控制。矿体以线脉一细脉及石英大脉型为主,围岩为中一晚元古代马面山群大岭组变质岩与加里东期二长花岗岩。 相似文献
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The application of electrical imaging and very low frequency (VLF) electromagnetics was investigated for the purpose of delineating basement fracture zones, and to show how incorporating a priori information in numerical modelling would facilitate the location of fractured zones within a basement rock more precisely. To this end, direct current (DC) dipole–dipole resistivity and VLF modelling and inversion experiments were carried out to evaluate the efficacy of the methods in detecting low-resistivity fracture zones in a typical crystalline basement rock that is favourable for groundwater accumulation. Most wells drilled in such an environment usually have low yields. Results of the numerical experiment generally indicate that fractures covered by moderate overburden, and having considerable depth, extent, and thickness compared to the depth of fracture burial, produce good responses resulting in high-resolution resistivity images. Lower resolution resistivity images were obtained as the thickness of the overburden increased. Also, the model investigations indicate that width of the fracture zone plays a major role in controlling image resolution. Conclusions from the synthetic modelling were confirmed by resistivity and VLF data gathered across a suspected fault in a hard rock terrain of southwestern Nigeria. The results from the field data are in general agreement with the numerical modelling experiments.Integración de métodos geofísicos superficiales para la detección de fracturas en macizos rocosos cristalinos del suroeste de Nigeria. 相似文献
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