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航磁在西南三江地区铜矿勘查中的作用探讨 总被引：1，自引：0，他引：1
本文探讨了西南三江地区航磁资料二次开发研究进行地质找矿的有效性。通过对玉龙铜矿磁异常特征的理论分析,在建立矿床磁性模型的基础上,探讨了利用航磁资料寻找斑岩型铜矿的有效性。最后采用定量分析方法进行了以航磁、遥感信息为主的综合信息找矿预测。 相似文献
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高精度磁测在西昆仑高寒山区矿产资源调查评价中的应用 总被引：1，自引：0，他引：1
测区位于西昆仑高寒山区，地处塔里木板块南缘，塔里木南部大陆边缘之西昆仑北缘晚古生代裂谷中。根据测区铜矿与基性岩体密切相关的特征，结合区内成矿地质环境和特殊的地形条件，沿沟谷和平缓山脊，采用自由网形式，进行了地面高精度磁测。通过地面高精度磁测，新发现磁异常带四条，圈定具有找矿意义的磁异常四个，基本查清了区内各类地质体的分布规律。对区内与成矿有关的基性岩体及火山岩（玄武岩）带进行了圈定。查清了已知岩体的分布范围，为进一步地质找矿指明了方向。 相似文献
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在白银厂铜矿深部及外围地区开展地质找矿任务十分紧迫。磁法在辅助金属矿深部找矿方面效果良好,研究该区磁异常特征可为深部找矿提供依据和参考。本文通过梳理白银厂及其外围1∶50 000地面高精度磁法和航磁实测资料,阐明了该区的岩（矿）石磁性、磁场分布和局部磁异常等特征。利用多种位场转换处理法结合多点实测校正的方法,综合分析磁异常与地层、岩浆岩、构造、矿化蚀变等成矿条件之间的联系,圈定局部磁异常20个,解译断裂构造18条、隐伏—半隐伏岩体6个,并对圈定的局部磁异常进行了解释推断和分类评价。研究结果表明：白银厂铜矿深部及外围地区成矿潜力较好,综合区域成矿规律和地质成矿背景,归纳地球物理找矿信息,进一步优选出找矿远景区7处。研究找矿远景区的特征,指明找矿方向,分析成矿潜力,以期为后续资源勘查提供磁异常依据和参考。 相似文献
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新型磁选装置的研制及其应用于分离超贫磁铁矿中的磁性铁 总被引：1，自引：1，他引：0
磁性铁是超贫磁铁矿勘查中的基本分析项目之一,为准确测定磁性铁的含量,首先需要实现磁性铁的定量分离。目前常用的手工内磁选法由于所用磁铁的有效磁场强度难以保证,而且受人为操作的影响较大,导致分析结果的重现性差。本文应用50 m L滴定管、电磁铁和三相异步电动机,研制了一种新型磁选装置——电磁式磁性铁分选装置,实现了超贫磁铁矿中磁性铁与非磁性铁的定量分离,结合重铬酸钾容量法建立了超贫磁铁矿中磁性铁的分析方法。在选定的磁选条件下(电流2.5 A,磁选管运动频率40 r/min,磁选时间5 min)分析铁矿石标准物质,磁性铁的测定值与标准值的相对误差小于1.0%;分析采自实际矿区的超贫磁铁矿样品,磁性铁的测定结果与手工内磁选法一致,且相对标准偏差(RSD,n=5)小于1.0%,优于手工内磁选法的精密度。本方法采用的电磁式磁性铁分选装置有效地控制了磁场强度的强弱,避免永磁铁出现磁损失,同时可以量化磁性铁分离的参数,提高了磁性铁的分析精度。 相似文献
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《Chemie der Erde / Geochemistry》2017,77(3):421-428
The magnetic particulates from anthropogenic activities can be detected by magnetic methods rapidly and cost-effectively. This study focused on the investigation of vertical variations in magnetic properties in soil profiles and magnetic enhancement originating in Baoshan, Shanghai. Also the feasibility of using arable and urban park soils as a new context for magnetic monitoring was explored. A combination of magnetic and scanning electron microscopic (SEM) techniques was applied to three soil profiles. Non-pedogenic magnetic enhancement in topsoil was recorded at all three sites accompanied by coarsening of magnetic grain size. The dominant magnetic properties reflect multi-domain (MD) and pseudo-stable single domain (PSD) ferrimagnetic minerals. Both of magnetic concentrations and grain size decrease with the depth, depending on the pollutant input, soil type and degree of vertical mixing. SEM images confirmed the presence of anthropogenic particulates fly-ash. It was concluded from this study that topsoil magnetic enhancement arising from atmospheric contaminants was readily identifiable in both arable fields and urban parks, thus broadening the scope of magnetic research on urban and industrial pollution. 相似文献
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In order to cooperate with 1∶ 50000 aeromagnetic survey work, master the rock magnetic characteristics and fill in the material blank of rock magnetic susceptibility data in southern Hotan Region in Xinjiang, we carried out regional rock magnetic susceptibility investigation work in the region from 2013 to 2015 years, completed properties measurement work of 331 points, obtained 10 256 effective volume magnetic susceptibility data and collected 270 pieces of rock samples. According to classified statistics in detail for the measured data and further analysis, we found that the magnetic susceptibility of this region rocks was mainly influenced by the mineral composition of rocks, structure and space-temporal distribution. The magnetic susceptibility of acid or medium-acid intrusive rocks was mainly decided by the content of the biotite in rocks, and the contribution of biotite to the magnetic susceptibility of acid or medium-acid intrusive rocks was higher than other super paramagnetic minerals. The magnetic susceptibility of the same lithology rocks was high along the distribution of deep fault, and was relatively low along the secondary fracture distribution. The magnetic susceptibility of acid or medium-acid intrusive rocks in early Paleozoic was higher than the magnetic susceptibility of acid or medium-acid intrusive rocks in the late Paleozoic. This research work can provide an important basis for the aeromagnetic data interpretation, geological prospecting and tectonic evolution research. 相似文献
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对安徽凤阳石英砂工业区土壤剖面的磁学参数和SiO2含量进行测试,结果显示：土壤剖面磁性矿物含量低,磁学性质由磁赤铁矿控制,土壤剖面由上而下可分成3个磁性层;从第一层到第三层磁性逐渐减弱;第三层磁学性质主要由成土母质决定,第一层存在明显的磁性增强现象,引起这种现象的原因可能是次生磁赤铁矿和燃烧作用。磁学参数和SiO2含量显示土壤剖面的第一层已被弱磁性石英尾砂污染,在石英尾砂的稀释作用下,其磁性结构特征发生了改变,磁性矿物含量降低。土壤剖面的磁学参数组合特征及SiO2含量反映了弱磁性石英尾砂对第一层土壤的污染过程。 相似文献
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ERIC GALLAWAY ALAN S. TRENHAILE MARIA T. CIOPPA ROBERT G. HATFIELD 《Sedimentology》2012,59(6):1718-1734
A combined field and laboratory study in northern Lake Erie has provided new insights into the origin and dynamics of heavy mineral placer deposits on beaches consisting primarily of non‐magnetic sediment. Work was conducted on the cross‐shore and longshore transport of heavy magnetic minerals using magnetic susceptibility and fluorescent paints to trace the movement, in the field, of samples of magnetic (magnetite) and non‐magnetic (quartz and calcite) grains, respectively. Laboratory experiments examined how the burial of small, dense magnetic minerals is affected by the grain size of the non‐magnetic host material, and how grain burial affects magnetic susceptibility measurements at the surface. The field experiments demonstrated that the magnetic mineral tracers were buried rapidly beneath coarser, non‐magnetic grains under low to moderate wave conditions, and subsequently were unable to move in the longshore or cross‐shore directions. The laboratory experiments showed that the magnetic susceptibility rapidly decreased with the rate and depth of burial of the magnetic minerals, and that magnetic grain burial was most effective beneath coarser rather than finer non‐magnetic sand and, for the latter sediments, under less rather than more energetic conditions. The results imply that magnetic mineral concentrations develop in this area through magnetic grain burial under fairly mild conditions, and subsequent settling, exposure and concentration in the upper swash zone during more energetic periods, when the non‐magnetic grains are eroded. It is probably during these erosional periods, when the magnetic minerals are exposed in fairly homogeneous deposits, that longshore and cross‐shore transport takes place. 相似文献
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高精度磁测在云南省德宏州某地区的应用,取得了较好的效果。采用规范的地面高精度磁测方法,取得可靠的磁测数据,圈定出磁异常。经过对资料处理与定性分析解释,推断出磁异常的成因,为开展下一步地质工作和找矿远景预测,提供了有效的地球物理依据。 相似文献
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岩(矿)石标本磁参数测定结果的精确性直接影响磁异常反演精度,对正确推断地质结论具有特别重要的意义。在进行高精度磁测磁参数测定过程中,发现利用质子磁力仪测定岩(矿)石标本磁参数时,按过去介绍的方法测定、计算的磁化率、剩余磁化强度普遍比实际值偏大一到十几倍,在分析和确定引起误差的原因后,提出了改进的方法,即要用岩(矿)石标本所产生的磁感应强度代替其梯度进行磁参数的计算而不能用其梯度值来求磁参数。并应注意如避开探头中级化场对标本磁化的影响,用第一位置测定以减少位置不准所产生的计算误差等问题。将改进方法用于后续研究的岩(矿)石标本磁参数测定,用其结果进行磁异常反演,求得磁性体埋藏深度、产状等与实际情况相符合。 相似文献
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磁悬浮力成金特征及成矿机制——以吉林夹皮沟金矿为例 总被引：3，自引：3，他引：3
磁斥力(又称磁悬浮力)在地学中的应用正在受到越来越多的关注本文以吉林夹皮沟金矿为例,通过磁悬浮成矿背景,磁悬浮力与成矿物源的关系,磁悬浮力持续存在与钾质岩石放射性核热能在富金中的作用,磁悬浮力与流体运移模式,磁悬浮力大小交变规律与成矿流体脉动等距性贯入耦合关系等特征的讨论,提出磁悬浮力成矿机制.该机制的主要学术思想是通过板块体旋转所产生的岩石剩磁磁斥力、磁斥力对流体的影响或控制来探求成矿作用.它力图从另一角度对绿岩金矿、与金相伴的有色多金属抗磁性矿物、金铀矿床和喷溢铁矿浆等方面给出若干新的解释,为成矿作用研究开辟新的领域. 相似文献
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运用1∶ 1 万高精度磁测方法,对1∶ 5 万矿产调查工作中发现的地球化学异常及克力代金矿点深部隐伏控矿构造及矿化蚀变进行评价。结果表明,高精度磁测不仅可以圈定隐伏的控矿构造,确定有利成矿区带,而且可以进一步圈定隐伏的强、弱磁性矿体。对克力代金矿点矿化蚀变带的1∶ 1 万高精度磁法测量数据解译表明,该矿化蚀变区内,由4 条深部隐伏断裂围限,形成了强磁性背景场下的局部低负异常区带,说明深部隐伏断裂构造及矿化蚀变等造成的降磁作用较强,暗示深部具有较大的成矿潜力。 相似文献
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The magnetic properties of the late Quaternary hemipelagic sediment from piston core BS77-15 taken in the Tyrrhenian Sea were investigated and the results compared with palaeoclimatic records. The magnetic mineralogy of the sediment was studied and the magnetic carriers were identified by their spectra of coercivity and unblocking temperature. Investigations of rock magnetic parameters such as the Natural Remanent Magnetization (NRM), the low-field magnetic susceptibility χ, the frequency-dependent susceptibility χ fd , the acquisition of Anhysteretic Magnetization (ARM) and Isothermal Magnetization (IRM) and the Median Destructive Field (MDF) have established the downcore variations in terms of magnetic mineralogy, grain size and coercivity in the sediments. The rock magnetic parameters were compared with an alternative climatic record from the same core based on the faunal association of planktonic foraminifera. A significant correlation was found between faunal climatic record and χ fd . Together with the magnetic properties of the sediment this suggests that a palaeoclimatic signal is recorded by a fine-grained low-coercivity fraction of the magnetic minerals. 相似文献