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为了查明地气微粒特征与隐伏矿体的关系,对贵州关岭丙坝铜矿床进行地气微粒采样,并用透射电子显微镜进行分析。研究结果表明:地气微粒存在形式有微粒聚合体和单个微粒,以微粒聚合体为主。单个微粒形态各异,有球状、板状、立方状、椭球状、条状、不规则状等,粒度一般在几纳米到300nm之间;微粒聚合体多呈链状、浑圆状、不规则状。微粒的元素组成与地下隐伏矿体具有较好的相关性,且发现较多微粒中含有高浓度的Fe、Mn、Pb、Zn等元素,这无疑对该矿区今后的地质找矿具有指导意义。此外,通过对比不同矿床的地气微粒特征,发现矿床类型不同,微粒的种类、成分、形态等特征有差异,但相同类型的矿床却具有较大相似性。矿床地气微粒特征与地下隐伏矿床具有较好相关性,在相似地质环境下形成的矿床微粒元素组成、大小大体上具有相似性,但其间的微粒组合、形态等仍会存在一定的差异性。因此,可以通过对隐伏金属矿床地气微粒特征的研究,建立不同矿床类型地气微粒特征模型。 相似文献
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《地质科技情报》2020,(2)
以甲基卡稀有金属矿区X03号矿体和烧炭沟矿体2个隐伏矿体作为研究对象,采用主动吸气法,以5%稀硝酸溶液作为捕集剂进行地气测量试验研究。结果表明,地气捕集液中Li、Be、Rb、Cs、Na、B等元素在矿体上方出现多点连续的组合异常,可以指示地表以下30～100 m的隐伏矿体。X03号矿体35号勘探线上,地气中成矿元素异常与土壤中元素含量之间没有相关性,表明地气异常并不是土壤元素含量所形成的,而是来源于隐伏矿体,是隐伏矿体的直接信息反映。地气异常表现为顶部异常特征,隐伏矿体位于异常的下部。甲基卡稀有金属矿区采用地气测量技术寻找隐伏矿体时,在成矿地质条件研究的基础上,结合电法等地球物理资料,可在地气异常的上方布置钻探工程进行钻探验证。 相似文献
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针对云南小寨铜矿苏家箐矿段地气采样所获得的16个地气微粒样品进行透射电镜观察分析,结果表明:地气中微粒呈现纳米级,大小为10nm到300nm不等,多为微粒聚合体,单体较少。微粒的形状多样,有似六边形、似椭球状、球状、不规则状等。微粒中含有成矿元素Cu以及伴生元素Fe,Pb,Zn,Mn,Co等,如SJQ-2A微粒中Pb含量为62.9%,SJQ-5B微粒中Co含量为24.1%。Cu出现频次很高,其质量分数也较高,如SJQ-1B和SJQ-6微粒中Cu含量分别为64.0%和73.3%。推测含金属微粒来源于深部隐伏矿体,金属微粒含有丰富的矿体信息。通过对比7个不同矿床的地气微粒特征,发现矿床类型不同其微粒特征(如种类、成分、形态、大小等)有较大差异;而与小寨铜矿苏家箐矿段具有相似地质环境的矿床,其地气微粒特征具有较大的相似性。微粒的元素组成与地下深处矿体具有较好的对应关系,无疑对该矿区今后的地质找矿具有指导意义。 相似文献
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以新疆金窝子金矿田210金矿带为例,实验研究了该区地气和土壤活动态测量等深穿透地球化学方法的效果。实验表明地气测量和土壤活动态测量可以有效地反映覆盖层下隐伏矿体。揭露矿体覆盖层的钻孔研究表明,金活动态形式具有“C”型分布特征。采集矿体上方地表异常位置土壤孔隙中地气、土壤样品,使用透射电子显微镜(TEM)实测样品中微粒物质的粒径、形貌和成分,在地气和土壤中观测到了Au-Cu、Au-Bi成矿元素纳米微粒,此微粒是形成地表深穿透地球化学异常的物质,来源于覆盖层下隐伏矿体。微粒到达地表,可以形成地气和土壤活动态异常。纳米微粒具有可从土壤颗粒表面分离的性质,在其向上迁移过程中,可以从吸附固定状态解吸,此性质可以用于解释活动态异常在钻孔垂直剖面上的“C”型分布。 相似文献
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通过铅锌矿地气模型模拟研究了地气流作用下,成矿元素及围岩中多种元素的迁移现象及规律。实验结果表明:铅锌矿的成矿元素Pb、Zn因迁出率大,伴生元素Cu、Mo、Au因迁出比大,可以在矿体上方形成易识别的地气异常,适合作为指矿元素。围岩对矿体中元素迁移存在复杂影响,但不会掩盖指矿元素形成的地气异常。在粤北隐伏花岗岩铀矿、桂北隐伏锌铜矿、湘南坪宝地区先后开展了地气测量探测隐伏金属矿研究及应用。根据室内实验及多个矿区、不同矿种上开展地气探测工作的成果,对地气法探测隐伏金属矿的有效性、地气场所包含的找矿与地质信息、地气测量的有效探测深度及地气异常与矿体的空间关联性、地表影响等问题进行了分析讨论。获取的资料表明:隐伏金属矿正上方均有成矿主元素及一批共(伴)生元素形成的地气异常;这种异常随矿体埋深增大,其幅度不是降低而是增大;地气法探测隐伏金属矿的有效深度可以达到千米尺度;地表污染不会对地气测量产生影响。 相似文献
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半干旱荒漠草原是我国重要的地貌景观类型,由于长期受风成沙的干扰,常规化探方法在该区找矿效果不理想。本文以位于内蒙古半干旱荒漠草原覆盖区的维拉斯托锌铜多金属矿为研究对象,进行了地气测量实验。同时,为筛选地气组分中的有效指示元素,对矿石矿物进行了采样分析。结果表明该矿区矿石矿物主要为闪锌矿、黄铜矿、磁黄铁矿、毒砂,成矿元素主要为Cu、Zn、Ag、As、Fe,部分矿石中Pb、Bi、Cd、Mn、Ni含量较高。地气组分中异常元素种类与矿石成矿及伴生元素一致,且异常位置与隐伏矿体基本吻合。地气与矿石、围岩的稀土元素（REE）球粒陨石标准化配分图解显示,异常区地气REE配分特征与矿石接近,说明地气成分继承了隐伏矿体的地球化学信息。以上研究证明地气测量可作为半干旱荒漠草原覆盖区寻找隐伏锌铜多金属矿的有效手段。 相似文献
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戈壁覆盖区常常出现较厚的覆盖层和坚硬钙积层,采用常规地球化学测量方法找矿效果不理想,金属活动态测量法对该区域不同类型隐伏矿体有良好的指示效果,但对隐伏型钼矿床指示效果研究较少。以新疆东戈壁钼矿为例,对比研究弱胶结层土壤中Mo,W和Cu元素全量和金属活动态含量对矿体的指示效果,探讨元素在土壤中主要存在形式。研究发现,在剥蚀戈壁区采集-4~+20目粗粒级土壤样品,可有效指示隐伏矿体,在堆积戈壁区采集-160目细粒级土壤样品,并测试成矿元素金属活动态含量,可有效指示深部隐伏矿体。钼矿体上方弱胶结层细粒级土壤中存在活动态的二次叠加含量,其中活动态Mo,W元素主要赋存于水提取态中,活动态Cu元素主要赋存于铁锰氧化物态中。 相似文献
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Tong Chunhan 《中国地质大学学报(英文版)》1999,10(4):329-332
INTRODUCTIoNThemineralresourcescanbehardlyfoundontheexpo-sureornearthesurfacerecent1y.Itbecomesmoreandmoredifficulttosearchfordeep-seatedresourcesoflargeorsuper-largedeposits,orthedeeppartoftheoldmines.Traditionalmethodsinsomecasesarelesssuccessfulinthesearchformetalmineralresourceshundredsmetersbelow.ExplorationactiQnsmoreandmoredependoncomprehensivemethodsandtechniques-Geogasprospectinghasbeendevelopingasanewandnontraditionalmethodforthisquiteurgenttask.Studyofthegeogasprospectingbased… 相似文献
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地气法－找深部金矿的新方法 总被引：4，自引：0，他引：4
介绍一种八十年代发展起来的找深部金矿的新方法一地气法。文中讨论了地气法的找矿机理，认为是地壳中上升气流将成矿元素微粒携带至地表而造成多元素异常。对工作方法着重讨论了地气采样与测试的系统，以及比较了积累式取样的效果。最后列出山东招远地区大尹格庄金矿８０号勘探线的地气测量多元素异常图。 相似文献
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The research achievements of geogas prospecting through the mechanisms of geogas prospecting and its applied research in the area of concealed uranium deposits prospecting were analyzed. Geogas prospecting is a new means of deeply concealed deposits exploration that started to develop gradually from the 1980s and is at an initial stage of research in concealed uranium deposits exploration. Furthermore, comments and suggestions were provided for following research work by summarizing the shortcomings and problems of current studies in this paper. A general upward micro-flow of geogas could carry the metal nanoparticles associated with ore body underground to the surface of earth to come into being anomaly halos of elements contents above the ore body, and with these anomaly halos, the relevant information of deeply concealed uranium deposits (or other classes of metal ore bodies) would be reflected. The depth that geogas measurement could achieve for prospecting concealed deposits under the covering layers is up to a thousand meter. Geogas prospecting can be used for investigating in small scales, surveying generally and in detail in big scales and locating the ore bodies. At the present stage, there are three primary under-mentioned problems in the studies of geogas prospecting: ①On the one hand, the researches of how mediums (covering layer) would affect the migration process of geogas are far from enough. On the other hand, appropriate mathematical theory models have not been set up yet. ②In China, there are currently few accurate and practical physical models for geogas prospecting to carry out controllable and repetitive series experiments as well as theoretical studies. It is essential that an appropriate physical model should be established timely in order to provide an experimental platform and a kind of technical assistance for the mechanism study of geogas prospecting. ③To achieve the aim of popularizing the geogas prospecting in the uranium exploration area, the research of trapping solution and sampling and measuring methods should be further developed and the methods of rapid geogas in-site measuring which are suitable for various geologic structures of uranium deposits should be made reasonably to cater to the need of rapid and accurate field measurement. 相似文献
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TEM observation of geogas-carried particles from the Changkeng concealed gold deposit,Guangdong Province,South China 总被引：2，自引：0，他引：2
Geogas prospecting is a relatively new technique in exploration for deep-seated and concealed mineral deposits. Now, the technique is to reveal the presence of concealed ore bodies by analyzing the element concentrations of substances that are transported by geogas from concealed ore bodies to the Earth's surface. However, the element concentrations provide us with limited information about the concealed ore bodies. In our work, to investigate the category, size, shape, chemical component of geogas particles, copper grids for transmission electron microscopy measurement were directly used to capture the geogas-carried solid particles in Quaternary sediments overlying the Changkeng concealed gold deposit, Guangdong Province, South China. In the samples, we found Au, PbSO4, WO3, Fe2O3, SiO2, TiO2, and Al2O3 particles, etc. using a transmission electron microscopy. Of which, gold particles, and Hg-, Zn-, Pb-, W-bearing particles may originate from concealed ore bodies and can provide more direct information than those provided by element concentrations. 相似文献
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地气测量在粤北某铀矿区的试验研究 总被引：1，自引：0，他引：1
在粤北某花岗岩铀矿勘查区开展了地气测量探测隐伏铀矿的试验研究.通过对勘查区4号和19号勘探线的快速地气取样,获取了U、Cu、Pb、Zn、Mn、Sr和稀土等38种元素信息.利用聚类分析、Pearson相关性分析以及稀土配分、Eu异常判断等方法对矿体的地气异常进行了研究,结果表明,U、Mn、Sr、Zn等地气异常在矿体上方或矿体边缘位置有不同程度的显示;U异常与Mn、Sr、Eu、Cu、Pb、Zn、Ho有较好的相关性;矿体上方地气异常区具有相似的稀土配分模式和负Eu异常.这些特征可以作为判定隐伏铀矿矿致地气异常的依据. 相似文献
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利用铅同位素研究金属矿床地气物质来源:甘肃蛟龙掌铅锌矿床研究实例 总被引：3，自引：1，他引：3
地气测量方法能够用来勘查隐伏矿和盲矿,但由于其机理还处在假说阶段,方法自诞生以来一直受到质疑.研究地气物质来源有助于对地气形成机理的认识.采用超净环境控制、高纯酸提纯和高纯制水等方法,成功地实现捕集材料空白Pb小于0.5 ng/mL.利用美国国家标准局SRM981铅同位素标准物质和SRM982富集铅同位素稀释剂,采用ICP-MS法首次实现低含量地气铅同位素比值的测定.矿区黄土、红层、围岩和矿石铅同位素组成由质谱法测定.结果显示,背景区地气样品由于铅同位素含量低,其铅同位素组成偏离矿区已知地质母体,可能主要受到捕集剂空白干扰所致;异常区地气铅同位素组成明显不同于背景区,样品点位于近矿围岩和矿石硫化物之间,且更靠近矿石硫化物,说明异常区地气样品有深部矿石硫化物铅的加入,从而为地气用于覆盖区矿产勘查提供了可靠的理论依据. 相似文献
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Study of Carbon‐Bearing Particles in Ascending Geogas Flows in the Dongshengmiao Polymetallic Pyrite Deposit,Inner Mongolia,China 
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下载免费PDF全文 Samples of ascending geogas flow particles were collected on to SiN grids directly in the Quaternary sediments overlying the Dongshengmiao polymetallic pyrite deposit, China. Corresponding soil samples were collected in the surface of Dongshengmiao district at the same time. After pretreatment, these SiN grid samples were analyzed by transmission electron microscopy. The tests focused on the characteristics of particles including size, shape, chemical composition, structure and association. The results show that there are numerous carbon‐bearing particles in particulate samples of the ascending geogas flow. The particles contain organic matter, carbonate or carbonate mixed with other minerals. These carbon‐bearing particles generally contain metallic elements like Fe/Zn/Au/Cu/Pb. However, all of the soil particles do not contain elemental C and only consist of common elements (O, Na, Mg, Al, Si, Ca, Ti) just like the composition of earth crust. Through a comparison between the particles from different sources, the carbon‐bearing particles were found to come only from the deep earth and carried useful information about concealed deposits as they pass through the deep‐seated orebodies. Given the influences of organic matter on mineralization, the carbon‐bearing particle may provide information on the deposit genesis. Combining the use of geogas particle for prospecting with characteristics of large depth, and the carbon‐bearing materials' close spatial and genetic relationship with orebodies, we propose a new prospecting method based on the characteristics of carbon‐bearing particles, including morphology, size, chemical component and ultra‐microstructure. This approach could be applied to the exploration of deposits deep in the earth and abundant in carbon‐bearing matter. This approach can provide efficient and effective deposit exploration. 相似文献