共查询到20条相似文献，搜索用时 15 毫秒
1.
以水系沉积物地球化学调查成果为基础,从统计学角度探讨了河北省金地球化学异常与金矿规模的对应关系。以2.6 ng/g为异常下限,在全省范围内圈定金区域异常28处,局部异常35处。研究发现区域异常与金矿的关系非常密切,100%的大型金矿、81.8%的中型金矿及70.9%的小型金矿都位于区域异常内。局部异常仅与小型金矿的关系密切,小型金矿在局部异常中的产出概率是20%。通过23个金异常面积与金矿储量的相关分析表明,二者相关性非常好,相关系数达0.919,金异常面金属量与金矿储量的相关性也很显著,相关系数达0.924。回归分析表明,金异常面积及异常面金属量与金矿床储量之间符合一元线性相关特征,并分别建立了回归方程。该成果对矿产预测及资源潜力评价具有一定的指导意义。 相似文献
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本文利用河北省1:20万化探扫面数据,以2.4ng/g为Au元素异常下限值,圈出了分布于冀北的3个金地球化学块体.选取矿产研究和开发程度均较高的两个块体和1个区域异常,计算得出河北省金矿的成矿率为0.45%.在此基础上,估算了勘查程度较低的地球化学块体及全省金异常区内的潜在资源量.得出全省Au的潜在资源量为1836.3 t,其中勘查程度较低的2号地球化学块体内潜在资源量占到该块体资源总量的3.8%,为河北省金矿下一步的重点勘探区域. 相似文献
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地球化学块体的方法技术在山东金资源潜力预测中的应用 总被引：6，自引：1，他引：6
山东的化探扫面工作已经结束了13a，积累了数十万的化探资料。作者尝试用地球化学块体的方法技术来挖掘这些资料的潜在价值。因此，对山东全省Au的资源潜力进行了预测，确定了圈定山东地球化学块体的下限值为2.5ng／g，圈出了2个地球化学块体和数十个区域异常。统计计算了2个地球化学块体和8个区域异常的参数特征，计算出1000m厚岩块总的Au供应量为419236t，根据所确定的成矿率0.90%来预测500m和1000m深度内这2个地球化学块体和8个区域异常所覆盖的15631km^2的范围内的Au的资源潜力为1249t和2522t。 相似文献
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为研究滇黔桂卡林型金矿区水系沉积物和岩石中金的地球化学时空分布及其与金矿规模的对应关系,系统收集了该区1:20万区域化探全国扫面计划水系沉积物和全国地球化学基准计划岩石金的地球化学数据,绘制了水系沉积物和岩石金的地球化学分布图。滇黔桂卡林型金矿区以水系沉积物金地球化学异常面积大于1000 km^2为准,共圈定5处金的地球化学省,这些金的地球化学省同时也是矿床大规模产出的部位。区内右江盆地水系沉积物金背景值(1.94×10^–9)高于扬子克拉通(1.68×10^9),其内以泥岩、页岩、砂岩、灰岩为代表的容矿岩石金背景值(0.51×10^–9)也高于扬子克拉通(0.39×10^–9)。研究区不同构造单元及沉积相中水系沉积物金背景值受岩石金背景值的制约。金的地球化学省是地壳演化过程中不均匀分布的高金背景岩石、金矿化作用及金矿床次生风化作用相互叠加的结果。该研究有助于有效判断异常成因、识别成矿作用存在,对研究金的区域成矿规律和聚焦找矿靶区具有重要意义。 相似文献
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水系沉积物测量在阿巴通德拉扎卡地区找矿应用 总被引：2，自引：0，他引：2
水系沉积物测量技术在马达加斯加应用较少,笔者通过在马达加斯加阿巴通德拉扎卡地区水系沉积物测量找矿勘查,探讨该方法在此类地球化学景观地区的应用效果。应用该方法,在马达加斯加阿巴通德拉扎卡地区圈定147处综合异常,通过野外1∶1万地质填图和地表工程揭露,发现钛铁、镍、金等矿产,这说明水系沉积物测量方法适用于马达加斯加中部高原地区的地球化学景观条件,圈定的异常准确、有效,并可取得较好的找矿效果。水系沉积物测量方法可在马达加斯加的同类地区推广使用。 相似文献
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黑河市大新屯锑-金矿床位于大兴安岭成矿带东北部,区内构造、岩浆活动频繁.1∶5万水系沉积物Sb、Au、Hg异常强度较高,规模较大,是金及多金属成矿有利部位.为了对区内1∶5万水系沉积物异常进行评价,选定了规模最大的新07Hs-35异常,利用土壤地球化学测量工作方法对异常进一步查证.经土壤地球化学测量工作后圈定Sb、Au、Hg、Ag、As、W土壤地球化学异常多处,以Sb、Hg、Au异常为主,各元素异常浓集中心吻合较好.因此利用槽探工程对圈定的土壤地球化学异常进行了验证,发现了锑-金矿体,从而确定了大新屯锑-金矿找矿靶区,说明地球化学勘查快速确定找矿靶区是成功的. 相似文献
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中国金的地球化学省及其成因的微观解释 总被引：3，自引：0，他引：3
利用全国1:20万区域化探扫面600×104km2和东天山、中蒙边界1:100万地球化学填图86×104km2的金分析数据,在全国圈定了15处金的地球化学省集中区,并发现与金矿成矿带或大型矿集区有关的地球化学省都具有多层套合结构特征。这种具有多层套合特征的地球化学省的形成是由高背景岩石、成矿作用和矿床风化产生的次生分散相互叠加的结果。高背景岩石提供了成矿元素的初始物源,成矿过程使得元素的进一步活化和富集,矿床风化产生元素的点源分散进一步形成叠加异常浓集中心,最后形成了具有多层套合的地球化学异常。通过使用微米和纳米观测手段发现地球化学样品中存在大量微米至纳米级金微粒,这种金微粒具有极强的活动性,能被各种营力作长距离搬运,形成了大规模具有多层套合特征的金地球化学省。 相似文献
8.
《Chemie der Erde / Geochemistry》2021,81(4):125811
Geochemical exploration by stream sediment sampling using bulk leach extractable gold (BLEG) technique and applying concentration-number (C-N) fractal model, factor analysis (FA), and geochemical mineralization probability index (GMPI) resulted in the recognition of new Au occurrences around the Sukari gold mine in the central Eastern Desert of Egypt. The geochemical data of 128 stream sediment samples collected from the study area was used for delineating the geochemical anomalies and characterizing the dispersion trains of ore and associated elements (Au, Ag, As, Sb, Cu, Pb, Zn, Mo). Statistical analysis of the geochemical data applying the C-N fractal modeling enabled us to identify significant anomaly and background populations of the investigated elements and to construct reliable geochemical anomaly maps. Factor analysis using centered log-ratios (CLR), to address the problem of closed compositional data, revealed significant element associations for mineralization (Au, As, Mo, Zn, Ba), country rock compositions (Rb, Li, Be, Sn, Bi for granite, and Co, Cr, Ni for mafic rocks), and element mobility (e.g. Sb, Zr, and Ag). Weak and moderate Au anomalies that cannot be detected by factor score maps can be delineated clearly by using the C-N fractal method and GMPI distribution map. Our study revealed that Ag, As, and Sb are the main pathfinder elements for gold mineralization in arid to semiarid regions exemplified by the Sukari gold district. Silver can be used as a “direct” pathfinder, whereas As and Sb are “indirect” pathfinders for Au in such regions. The spatial distribution of Au and Ag anomalies indicate that gold mineralization in the Sukari district is structurally controlled. However, the spatial distribution of Cu, Pb, Zn, and Mo is controlled by mineralogical and lithological factors and is not related to any significant base metal deposits. 相似文献
9.
中国泛滥平原沉积物中铂,钯丰度值及地球化学省的初步研究 总被引：29，自引：5，他引：24
根据中国泛滥平原沉积物中Ｐｔ、Ｐｄ的分析结果,求得泛监平原沉积物中的Ｐｔ、Ｐｄ近似丰度值分别为０．４６ｎｇ／ｇ和０．４０ｎｇ／ｇ。据泛监平原沉积物中Ｐｔ、Ｐｄ的空间分布模式初步圈出滇黔Ｐｔ、Ｐｄ地球化学省,新疆Ｐｔ、Ｐｄ地球化学省和西藏雅布江Ｐｔ、Ｐｄ地球化学省。 相似文献
10.
河北省金的矿源层和地球化学块体 总被引：2，自引：0，他引：2
以区域化探岩石和水系沉积物测量成果为依据,讨论河北省范围内Au矿源层的地球化学判别、岩浆热液型金矿成矿过程的地球化学推导、Au的地球化学块体以及水系沉积物区域地球化学异常特征等问题.地层标准剖面和典型侵入体系统的岩石地球化学调查表明,在Au矿源层和非矿源层之间,w(Au)差异很小,以其作为判别标准是不可行的,但H2O ,CO2,S,Cl,F,Hg等组分却存在显著差异,据此提出一个新的矿源层--中新元古界碳酸盐岩.Au的区域地球化学背景研究显示,密云-青龙、怀安-崇礼-赤城、平泉和阜平-赞皇等地区存在着地球化学块体,而水系沉积物地球化学异常分布与这些块体基本一致,相互对应. 相似文献
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《Chemie der Erde / Geochemistry》2021,81(4):125829
The Yunnan-Guizhou-Guangxi region is well known for its abundant mineral resources, and low-temperature hydrothermal mineralization represented by the elemental association of gold, arsenic, antimony and mercury is widely developed there. Many studies on the geological-geochemical characteristics of gold have been conducted, but a comprehensive understanding of the antimony geochemical pattern is still lacking. This paper studied the Sb distribution characteristics and the cause of geochemical anomalies based on the geochemical data of stream sediments and rocks in the study area. In addition, the geochemical data of Au, As, Sb and Hg were centered and log-ratio transformed to eliminate the closure effect, and then random forest regression (RFR) with Au, As and Hg as the characteristic variables was used to investigate the ore-related geochemical anomalies of Sb. Seven geochemical provinces were delineated from the original geochemical data, and they are not entirely consistent with the known deposits. Sb moves from the rocks to the stream sediments during weathering. The variation trend in the Sb background values in stream sediments in each tectonic unit is consistent with that in the rocks themselves, implying that Sb in the stream sediments is inherited from the background rocks. The distributions of Sb predicted by RFR are similar to the distribution pattern of Sb in stream sediments. Of the three elements considered, the influence of As on the variations in the Sb geochemical background is the greatest, followed by Au and then Hg. The geochemical anomalies extracted by the residuals produced in this algorithm are consistent with where the known Sb metallogenic district is located, indicating that this method of recognizing geochemical anomalies is feasible and effective and has theoretical and practical significance. 相似文献
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The Extended Sample Catchment Basin (ESCB) mapping technique, discussed in this paper, can be used to display the spatial distribution of geochemical variables measured in stream sediments taking into consideration the geomorphologic settings and the hydrographic patterns of surveyed areas. This approach is based on the association of an area of statistical representativeness with each sample, and on the assumption that the concentrations measured in the stream sediments can be considered as average reference values for this area.ESCBs can be easily identified considering the position of the sampling points within the hydrographic network and using the confluences between the streams of highest rank as break points for representing changes of the geochemical background. This approach, different from the traditional geostatistical and deterministic ones, does not consider the Euclidean distance among the sampling points as a measure of geochemical similarity but only refers to their functional relationship along the streams (following the water and the sediment flow) to measure their proximity.ESCBs can be seen as a specific development of previous techniques based on catchments and proves to be especially useful for supporting land planning in a preliminary survey phase while it is not specifically suitable for the identification of point sources of geochemical anomalies.Due to the fractal nature of the hydrographic network, all the procedures can be driven in a GIS environment by using digital terrain models apart from their spatial resolution. 相似文献
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Platinum and palladium abundances in floodplain sediments and their geochemical provinces 总被引：10，自引：0，他引：10
Results obtained from the wide-spaced floodplain sediments indicate that the abundances of Pt and Pd in floodplain sediments are 0.46ng/g and 0.40ng/g,respectively.Three geochemical provinces.Yunnan-Guizhou,Xinjiang-Gansu and Tibet of Pt and Pd with a content of 0.8ng/g,were delineated. 相似文献
16.
Di Zhou 《Journal of Geochemical Exploration》1985,24(2):207-222
Conventional analyses of exploration geochemical data assume that the background is a constant or slowly changing value, equivalent to a plane or a smoothly curved surface. However, it is better to regard the geochemical background as a rugged surface, varying with changes in geology and environment. This rugged surface can be estimated from observed geological, geochemical and environmental properties by using multivariate statistics.A method of background adjustment was developed and applied to groundwater and stream sediment reconnaissance data collected from the Hot Springs Quadrangle, South Dakota, as part of the National Uranium Resource Evaluation (NURE) program. Source-rock lithology appears to be a dominant factor controlling the chemical composition of groundwater or stream sediments. The most efficacious adjustment procedure is to regress uranium concentration on selected geochemical and environmental variables for each lithologic unit, and then to delineate anomalies by a common threshold set as a multiple of the standard deviation of the combined residuals. Robust versions of regression and RQ-mode principal components analysis techniques were used rather than ordinary techniques to guard against distortion caused by outliers Anomalies delineated by this background adjustment procedure correspond with uranium prospects much better than do anomalies delineated by conventional procedures. The procedure should be applicable to geochemical exploration at different scales for other metals. 相似文献
17.
在陕西秦岭巴山地区9万km2内,通过1:20万区域化探扫面,发现了一批多元素综合异常,并根据地质构造背景分析划分出五个异常带(区)。其中新发现的北秦岭Au、Ag、Pb、Zn异常带,规模大、元素组合复杂且含量高,为一重要的金、多金属成矿带。1986年开始,在该区大力开展区域化探异常查证工作。通过1:5万水系沉积物测量,圈定了以金元素为主的化探异常。在主体异常部位系统地开展了1:1万土壤测量和槽探工程,于当年就在周至县马鞍桥发现了金矿体。随后又根据化探异常特征,布置了钻探和坑探工程验证。经进一步检查和详查,确认马鞍桥金矿为一大型金矿床。 相似文献
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吉林省敦化尔站矿区位于吉黑东部多金属成矿带中南部,以往资料表明有Mo、Cu等元素地球化学异常和斑岩体存在。为查明该区成矿条件,明确勘探思路,开展了水系沉积物、土壤元素地球化学和地物化综合剖面测量工作。通过对各元素分布、相关性和异常特征研究,发现水系和土壤地球化学异常具有较好重现性,R型聚类分析表明Mo与As、W元素相关性较好,主成矿元素为Mo元素,在地球化学高异常和低阻高极化率区域进行异常查证,发现钼矿体6条。钼矿体产于晚二叠世蚀变似斑状二长花岗岩体及其与围岩接触带,主要受北东向构造带控制,Mo和As等元素地球化学异常与矿体和蚀变带的辉钼矿、黄铁矿等关系密切。综合分析尔站矿区成矿地质条件,在已发现矿体北东和南东圈定靶区2个,区域上含前寒武系残片呈北东向展布的晚古生代花岗岩区是重点找矿地段。 相似文献
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研究区地球化学景观属于甘肃北山干旱荒漠戈壁残山区,通过1∶2.5万水系沉积物测量在北山盐池黑山一带圈定多处金弱异常。为突出成矿及指示元素的地球化学异常特征,提高找矿效果,优选水系沉积物测量金弱异常,开展1∶1万岩屑测量,利用相关性及R型聚类分析对元素组合特征进行分析、归纳,并圈定单元素异常和综合异常。对成矿前景较好的2处综合异常,采用踏勘追索、大比例尺地质填图及探槽等手段进行查证,发现了盐池黑山南金矿,实现了在水系沉积物弱异常区的找矿突破,研究成果充分证实岩屑测量在甘肃北山干旱荒漠戈壁残山区进行地质找矿的有效性,为北山水系沉积物测量弱异常区找矿提供了新的途径。 相似文献