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地球化学块体与大型矿集区的关系——以东天山为例 总被引：11，自引：5，他引：11
通过在东天山15万km2的战略性深穿透地球化学调查共圈出大于1000km2以上的地球化学块体18处,其中铜-铅-锌-银地球化学块体5处,铜地球化学块体3处,铜-镍地球化学块体1处,金的地球化学块体4处,铀的地球化学块体3处,铂-钯地球化学块体1处,钨地球化学块体1处。有6处地球化学块体与已知矿集区相对应,新圈定的地球化学块体12处,其中有3处发现了新的矿床。根据这些块体与矿集区的对比得出如下结论:所有的已知矿集区都位于地球化学块体的范围之内,地球化学块体为矿集区的形成提供了丰富的物质基础;有矿集区的存在一定有地球化学块体的存在,但反过来有地球化学块体的存在不一定有矿集区的存在,地球化学块体是客观存在的,而矿集区是已经发现了一系列矿床并勘探到一定程度才能称作矿集区,因此,地球化学块体内可能会存在潜在的矿集区,这为利用地球化学块体预测新的矿集区提供了依据。 相似文献
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《西北地质》2020,(1)
塔吉克斯坦位于中亚腹地,大地构造位置上处于古亚洲与特提斯两大构造域的结合部位,特殊的大地构造位置使其具有丰富的矿产资源。笔者以地球化学块体理论为指导,借助低密度地球化学数据与区域地球化学信息分析系统,从地球化学块体角度对塔吉克斯坦金矿资源潜力进行预测。塔吉克斯坦全境共圈定金地球化学块体8处,结合已知金矿床及成矿地质背景对各金地球化学块体特征进行总结,在综合研究的基础上,认为塔吉克斯坦金资源潜力巨大,按照金资源量由大到小的顺序依次为泽拉夫尚东金地球化学块体、卡拉马扎尔西金地球化学块体、泽拉夫尚西金地球化学块体、中帕米尔金地球化学块体、卡拉库里北金地球化学块体、东南帕米尔金地球化学块体、卡拉马扎尔东金地球化学块体和穆克苏金地球化学块体,塔吉克斯坦南天山地区有发现超大型金矿的潜力。 相似文献
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长江中下游地区铜地球化学块体物质来源及其对铜矿集区形成的制约 总被引：1，自引：0，他引：1
本文从成矿物质供应角度入手,来剖析长江中下游地区大型矿床/矿集区的成因。研究区内共圈定出5个Cu地球化学块体,区内所有已发现的Cu矿集区和绝大多数已发现的大型Cu矿均位于Cu地球化学块体范围内。根据前人获得的研究区典型成矿岩体的Sr-Nd、Hf同位素及成矿岩体中继承锆石年龄,推断研究区产出有矿集区中Cu地球化学块体内巨量的Cu元素主要来源于富集岩石圈地幔,并有少量地壳物质的贡献。正是由于长江中下游地区存在规模巨大的Cu地球化学块体,这些块体能够提供区域成矿带所需的巨量的成矿物质,从而使得该区经历了长期的构造活动、岩浆作用和成矿作用后形成了数量众多的铜矿床。 相似文献
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笔者应用地球化学块体理论，对全省化探数据进行综合分析处理。圈出14种元素地球化学块体173个，其中地球化学巨省25个，地球化学省148个。总结地球化学块体在空间上的分布规律。通过研究地球化学块体内部结构，追踪大型至特大型矿床可能存在的地点。利用块体内已探明的金属储量，计算其成矿率，预测其他元素或其他地段的金属资源总量，固定成矿远景区，确定巨型矿床找矿靶区7处。通过不同级别地球化学块体与成矿区带的关系研究，对重要地球化学块体、子块体与成矿亚带、矿田进行对比，对地球化学块体内区域矿产资源潜力作出评价。 相似文献
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以地球化学块体理论为基础的方法和技术确定了沱沱河铅锌地球化学块体的下限和含量级次,对沱沱河地区铅锌元素的地球化学块体进行了划分,总结了地球化学块体在空间上的分布规律,通过研究地球化学块体内部结构,追踪大型至特大型矿床可能存在的地点。根据已知地区的矿产探明储量与地球化学块体的关系,计算了该地区成矿率,预测了区内铅锌矿资源潜力,同时指出在块体内还存在巨大的寻找铅锌矿产资源的潜力。 相似文献
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巨型矿床与大型矿集区勘查地球化学 总被引：19，自引：0，他引：19
巨型矿床和大型矿集区有着巨量的成矿物质供应与聚集,表现为地壳上存在某些成矿元素含量高度聚集的地球化学块体．地球化学块体中只有一部分呈活动态易被各种流体携带的金属才能逐步浓集成矿,并在大矿、巨矿和矿集区周围留下一系列套合的地球化学模式谱系。文中阐述了发现和识别大矿、巨矿和矿集区四周套合地球化学模式的采样系统,研制了能觉察地下深部发出极微弱直接找矿信息的深穿透地球化学方法－－金属活动太测量与地球气纳微 相似文献
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应用岩石化学元素丰度研究地球化学块体 总被引：1，自引：0，他引：1
应用岩石化学元素丰度研究地球化学块体,探讨地球化学块体中元素组成的差异.对中国东部岩石地球化学块体研究表明,华南分布着的巨大的W, Sn, Mo, Bi, U, Th, Pb, Li, Rb, Cs, Be, Nb, Ta, HREE, Y及Tl, Cd, F, K岩石地球化学域,其中的岩石地球化学块体是形成水系沉积物地球化学块体和大型矿集区的主要物质来源.该研究不仅丰富了地球化学块体理论,而且以新的视野从宏观角度上为勘查地球化学、理论地球化学、成矿学与找矿学、环境地学、大地构造学提供有价值的基础性研究资料. 相似文献
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地球存在着化学不均一性,在宏观上表现为矿床分布的不均一性,大型矿集区的出现也是地球化学不均一性的表现.运用深穿透地球化学测量方法,发现华北地台与扬子地台及秦岭-大别造山带之间,主要成矿元素Au、Cu存在很大差异,华北地台主要以金的地球化学块体大规模出现为特征,而扬子地台北缘Cu、Pb、Zn的平均含量高出华北地台1倍,并且出现一个较大的Cu地球化学块体.从这些研究,我们可以发现,不同大地构造单元中元素分布是不均匀的.华北地台和扬子地台物质供应的巨大差别,导致两个地台成矿特征的差别. 相似文献
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紫金山矿集区地球化学异常特征及找矿潜力预测 总被引：2，自引：2，他引：0
王少怀 《大地构造与成矿学》2011,35(1):156-160
运用地球化学块体理论,在福建省1∶20万区域化探数据基础上,利用10km×10km窗口数据,圈定了紫金山矿集区金地球化学异常,依据大型矿床地球化学定量评价模型和方法计算出金的找矿潜力。本文尝试在该块体中通过提高分级值,对紫金山矿集区区域地球化学异常进行了圈定并勾绘出内部结构的谱系树图。分析了金地球化学块体各级含量水平所对应的面积、可供金属量、浓集度等参数特征。探索金元素地球化学块体的内部结构,揭示金在地球化学块体中逐步浓集的轨迹,最终指出找矿方向。 相似文献
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A detailed mercury survey was carried out over the mausoleum of the famous Emperor Qin Shi Huang. A strong, well defined anomaly was found in soil samples collected on the central part of the tomb mound. The anomaly presented a direct evidence for the authenticity of the accounts stated in Shi Ji (the first comprehensive Chinese historical writing completed about 109-91 B.C.) that there existed a large mercury reservoir in the underground basement of the Emperor's mausoleum. 相似文献
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Ping LI Xinbin FENG Guangle QIU Shaofeng WANG 《中国地球化学学报》2006,25(B08):235-235
Mercury smelting is one of the important anthropogenic atmospheric mercury emission sources. Small-scale mercury smelting activities with indigenous method which is considered illegal and forbidden by local government always extensively existed in the Wuchuan area, northeastern Guizhou Province, China. Because of the simple processes without any environmental protection, a large amount of mercury vapor released to the ambient air during the processing of cinnabar roasting. By determining mercury concentrations in mercury ore and smelting slag samples, a mass balance method was used to calculate mercury emission factors and annual mercury emission from indigenous mercury smelting in Wuchuan mercury mining areas, Guizhou Province, China. The mercury emission factors ranged from 6.9% to 32.1% with the recovery from 78.4% to 93.6% and the annual mercury emission was up to 3.7-9.6 metric tons. The results highlighted that the indigenous mercury smelting was one of the most important anthropogenic atmospheric mercury emission sources in this region. 相似文献
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Guangle QIU Xinbin FENG Shaofeng WANG Xuewu FU Ping LI 《中国地球化学学报》2006,25(B08):28-28
Mercury as a toxic element poses environmental concerns, especially in historically Hg-mined districts. The Wanshan Hg mine located in the eastern part of Guizhou Province, southwestern China, ranks the largest Hg-producing district in China. Mining at Wanshan was initiated in 221 B.C., but ceased in 2001. Approximately 22000 tons of Hg, 6000 tons of cinnabar and large quantities of mine-wastes had been produced at Wanshan. Significant quantities of calcines, which were piled irregularly near the old mine processing sites and retorts, continue to impact the local environments in the Wanshan area. In this study, a regional contamination of mercury in surface waters collected from the Meizixi, Dashuixi, Huandao and Gaolouping rivers, whose upstreams or branches originate from the hilly karstic area and receive drainage arising from the calcines, was investigated by determining all Hg species in a base-flow and a flood-flow season. Reactive, dissolved, particulate, and total Hg concentrations in surface water varied from 0.60 to 400 ng/L, 11 to 430 ng/L, 1.4 to 9210 ng/L, and 15 to 9260 ng/L, respectively. Total methylmercury in water samples ranges from 0.31 to 25 ng/L. The concentrations of total Hg and particulate Hg in water samples collected during the flood season are higher than those in the base-flow season, whereas, the concentrations of dissolved and reactive Hg are lower with the peak values observed in water samples collected in the base-flow season. A strong positive correlation between total Hg and particulate Hg is noticed in the water samples collected from Hg-mined areas with the proportion higher than 80%. 相似文献
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应用于水文与工程地质的化探新方法土壤吸附汞地球化学测量 总被引：5，自引：0，他引：5
介绍了化探土壤吸附汞地球化学测量方法的基本原理,指出土壤中汞异常具有多种来源,单一测汞方法不能区别其来源。测汞方法最重要的作用最准确指出汞气的迁移通道－基岩的断裂破碎带。因此该方法更适用于水文与工程地质勘查,特别是地下水勘查。 相似文献
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Sirosorb is a low cost, high efficiency gold collector for mercury vapor for use in mineral exploration programs. The collector is prepared by depositing gold onto a gas chromatography diatomite support.Sirosorb can be employed to collect mercury from soil gas or water samples. It can also be used to selectively collect mercury from gas streams containing substances which interfere with mercury analyses.When dosed with known amounts of mercury vapor, Sirosorb provides a convenient calibration standard for field use. If Sirosorb is stored in a closed tube, Hg loss is negligible at temperatures up to 100°C. 相似文献
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The mercury contents of 11 sandstone, 11 shale and 6 limestone samples from Pennsylvania average 7, 23 and 9 ppb Hg, respectively, which is lower than the values for sedimentary rocks reported in the literature. The differences may arise because many of the reported high values are from regions characterized by more mineralization and volcanism than is present in central Pennsylvania. The lowest values found for shale and sandstone in Pennsylvania (0.4 and 0.5 ppb Hg, respectively) are lower by an order of magnitude than the lowest previously reported values. The mercury content of sedimentary rocks varies markedly due to the effects of volcanism, organic material and sulfur in reducing environments, iron and manganese oxides in oxidizing environments, diagenesis, hydrothermal processes, and the thermal history of the rock.Soils in Pennsylvania have much greater amounts of mercury than their parent rocks even after taking into account possible residual concentration, suggesting that mercury is added to the soils from an outside source. Rain is the major source of mercury absorbed by the soil. A portion of the absorbed mercury returns to the atmosphere, establishing a rain-soil-atmosphere mercury cycle. The general enrichment of mercury in soils and sediments compared to rocks is supported by the observation that the mercury content of rain is greater than freshwater. The much higher values of mercury in unconsolidated sediments compared to sedimentary rocks suggest that mercury is lost during diagenesis.Man's contribution of mercury to the surface environment is nearly equal to the natural contribution. Industrial loss contributes more than 65 per cent of man's total, and the contribution of fossil fuel consumption is small, although it may be locally important. The implications of mercury loss and absorption by soils may be an important factor in concentrating mercury in crops and other living matter, especially near industrialized areas. 相似文献
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Johan Rydberg Jon Karlsson Ida Wanhatalo Richard Bindler 《Geochimica et cosmochimica acta》2010,74(24):7116-7126
Even if mires have proven to be relatively reliable archives over the temporal trends in atmospheric mercury deposition, there are large discrepancies between sites regarding the magnitude of the anthropogenic contribution to the global mercury cycle. A number of studies have also revealed significant differences in mercury accumulation within the same mire area. This raises the question of which factors, other than mercury deposition, affect the sequestration of this element in peat. One such factor could be vegetation type, which has the potential to affect both interception and retention of mercury. In order to assess how small-scale differences in vegetation type can affect mercury sequestration we sampled peat and living plants along three transects on a northern Swedish mire. The mire has two distinctly different vegetation types, the central part consists of an open area dominated by Sphagnum whereas the surrounding fen, in addition to Sphagnum mosses, has an understory of ericaceous shrubs and a sparse pine cover. A few main patterns can be observed in our data; (1) Both peat and Sphagnum-mosses have higher mercury content (both concentration and inventory) in the pine-covered fen compared to the open Sphagnum area (100% and 71% higher for peat and plants, respectively). These differences clearly exceed the 33% difference observed for lead-210, which is considered as a good analogue for atmospheric mercury deposition. (2) The differences in mercury concentration between peat profiles within a single vegetation type can largely be attributed to differences in peat decomposition. (3) When growing side by side in the open Sphagnum area, the moss species Sphagnum subsecundum has significantly higher mercury concentrations compared to S. centrale (24 ± 3 and 18 ± 2 ng Hg g−1, respectively). Based on these observations we suggest that species composition, vegetation type and decomposition can affect the mercury sequestration in a peat record, and that any changes in these properties over time, or space, have the potential to modify the mercury deposition signal recorded in the peat. 相似文献