共查询到20条相似文献，搜索用时 343 毫秒
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作者通过对曾家垅含锡矿物特征及赋存状态的分析认为，曾家垅含锡独立矿物以锡石为主，次为马来亚石及黄锡矿。在华南锡成矿带中，马来亚石的矿物组合在曾家垅锡矿床中首次发现，读矿物组合在岩浆期后不同的成矿阶段各具特色。矽卡岩晚期高温氧化物阶段和石英硫化物阶段早期是锡石、马来亚石的主要成矿期，所晶出的大量锡石构成了曾家垅锡矿床的主体。 相似文献
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某地钠化花岗岩中的水锡石已由邓楚均等同志作过研究。由于当时是在钠化花岗岩的人工重砂样品中找到该种矿物,因而对水锡石的产状描述为“产于花岗岩隆起的顶部,直接位于似伟晶岩顶盖之下,向深部含量迅速减少。”对水锡石的成因认为“是一种水化了的矿物”。笔者在该区露天采场的半风化的钠化花岗岩标本上找到了水锡石。经光、薄片观察,并作了适量的测试,查明了岩(矿)石中水锡石与其它矿物的连生关系,区分出原生钖石和表生锡石,发现了由水锡石演化成锡石的关系,因而对水锡石的成因及其演化关系有了进一步的认识。 相似文献
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赣南漂塘钨矿锡石及共生石英中流体包裹体研究 总被引：13，自引：0，他引：13
漂塘钨矿床是赣南地区一大型石英脉型钨多金属矿床,钨锡共生是该矿床的重要特征.在详细的岩相学观察基础上,采用“流体包裹体组合”(FIA)的研究方法,对该矿床锡矿化显著的(绿柱石)、锡石、黑钨矿-石英脉阶段石英脉中锡石及与其共生的石英中流体包裹体进行了显微测温和拉曼探针的分析.结果表明,锡石与共生石英形成的物理化学条件并不一致,两类矿物中流体包裹体揭示的流体演化过程也明显不同.锡石中原生的流体包裹体反映了锡石形成时真实的温压条件,与锡矿化相关的流体为高温、中-低盐度的NaCl-H2O流体体系.研究认为,锡石中流体可能主要来自于岩浆的结晶分异,流体体系的冷却是锡在流体中沉淀的主要机制. 相似文献
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朱立军 《矿物岩石地球化学通报》1988,(3)
九毛锡矿矿体产于超基性岩体及其外侧四堡群变质岩系中,空间上表现为明显的“双控”(岩控、层控)特征,时间上显示出成矿作用明显的多期、多阶段性,成矿过程可划分为岩浆期、热液期和表生期。热液期是主要的成矿时期,进一步划分出锡石硅酸盐阶段、锡石硫化物阶段和木锡石石英阶段。不同成矿阶段的锡石由于产出特征和形成条件的不同而各具特色,构成不同的锡矿石类型,主要有锡石蛇蚊石型。锡石绿泥石型、锡石硫化物型、锡石石英型。 相似文献
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大井锡多金属矿床矿石矿物成分及时空演化 总被引：9，自引：0，他引：9
文章总结和划分了矿床的矿石类型、矿化阶段及其在空间上的分布；对不同阶段、不同地段和不同类型的黄铁矿类、毒砂、黄铜矿、闪锌矿、方铅矿和锡石等6种主要矿石矿物进行了电子探针微区分析。结果显示，矿床中主要矿石矿物的化学成分明显受时间因素控制，尤其是黄铁矿类和锡石。毒砂、闪锌矿、黄铜矿和方铅矿等硫化物，更具空间上的分带性，总体上，老区东部－北区南部的矿物成分特征显示出其形成温度较高，可能是本区的重要矿化中心，而南区和西区可能还存在其他的矿化中心。 相似文献
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要寻找锡矿,首先就要认识锡的主要工业矿物——锡石。由于锡石与伴生矿物闪锌矿、砷铅矿、金红石、板钛矿、锐钛矿、褐帘石、石榴石及锆石等在颗粒细小时难于分辨,为此,笔者研究了鉴定锡石薄膜反应的简、快、准条件,并改进了薄膜物微化分析方法。 一、原理 相似文献
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某地钠化花岗岩中的水锡石已由邓楚均等作过研究。由于当时仅在钠化花岗岩的人工重砂样品中找到该种矿物,因而对水锡石的产状只作了简单的描述。对其成因则认为“是一种水化了的矿物”。笔者在该矿区露天采场的半风化钠化花岗岩标本上找到了水锡石,经光、薄片观察,并作了某些测试,查明了岩(矿)石中水锡石与其它矿物的连生关系,区分出原 相似文献
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A. Huska W. Powell S. Mitrovi&#x; H. A. Bankoff A. Bulatovi&#x; V. Filipovi&#x; R. Boger 《Geoarchaeology》2014,29(6):477-493
Tin is a rare metal that is essential for making bronze, the defining technology of the Bronze Age. The source(s) of tin for Aegean bronze is undetermined but several small Bronze Age tin mines have been documented in the circum‐Aegean region. The discovery of Bronze Age archaeological sites in West Serbia near a tin placer deposit on the flanks of Mt. Cer led to an investigation of this site as a potential additional Bronze Age tin mine in the region. Geochemical prospecting of stream sediments flowing from Mt. Cer allowed for categorization of streams based on relative tin grade. Tin grade is highest in the Milinska River, a likely combination of a broad catchment area with multiple ore‐bearing tributaries, and a topographic profile that favors the accumulation of placer deposits. A survey of cornfields along the southern pluton margin discovered archaeological sites spanning the Neolithic to the Iron Age. Unlike older and younger sites, those of the Bronze Age were found only along the Milinska and Cernica Rivers where placer tin grades are highest, but appear to be absent where tin is scarce or absent. This suggests that these sites were associated with the exploitation of the tin ore. 相似文献
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Determination of the Tin Stable Isotopic Composition in Tin‐bearing Metals and Minerals by MC‐ICP‐MS 
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下载免费PDF全文 Gerhard Brügmann Daniel Berger Ernst Pernicka 《Geostandards and Geoanalytical Research》2017,41(3):437-448
This study uses MC‐ICP‐MS for the precise analysis of the stable tin isotopic composition in ore minerals of tin (cassiterite, stannite), tin metal and tin bronze. The ultimate goal is to determine the provenance of tin in ancient metal objects. We document the isotope compositions of reference materials and compare the precision of different isotope ratios and the accuracy of different procedures of mass fractionation correction. These data represent a base with which isotopic data of future studies can be directly compared. The isotopic composition of cassiterite and stannite can be determined after reduction to tin metal and bronze, respectively. Both metals readily dissolve in HCl, but while the solutions of tin metal can be directly measured, the bronze solutions must be purified with an anion exchanger. The correction of the mass bias is best performed with an internal Sb standard and an empirical regression method. A series of Sn isotope determinations on commercially available mono‐element Sn solutions as well as reference bronze materials and tin minerals show fractionations ranging from about ?0.09‰ to 0.05‰/amu. The combined analytical uncertainty (2s) was determined by replicate dissolutions of reference materials of bronze (BAM 211, IARM‐91D) and averages at about 0.005‰/amu. 相似文献
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Michel L. Schlegel Christian Bataillon Keltoum Benhamida Cécile Blanc Denis Menut Jean-Luc Lacour 《Applied Geochemistry》2008
In this study, microscopic and spectroscopic techniques (scanning electron microscopy coupled with energy-dispersive X-ray analysis, Raman microspectroscopy, micro X-ray fluorescence spectroscopy, micro X-ray fine structure adsorption spectroscopy, and micro laser-induced breakdown spectroscopy) were combined to decipher the chemical and mineralogical properties of a saturated Fe–clay interface reacted at 90 °C and 50 bar for 8 months. The results collectively confirm the presence of a corrosion layer and a clay transformation layer. The corrosion layer is made of a magnetite-containing internal sublayer and a Fe-phyllosilicate external sublayer enriched in Na, with traces of goethite presumably resulting from sample reaction with air. The clay transformation layer is made of predominantly Ca-rich siderite (FeCO3). It is depleted in Al and K, suggesting dissolution of rock-forming minerals. The corroded thickness determined from the amount of Fe in corrosion and transformation layers and assuming zero porosity equals 19 ± 9 μm. These data indicate that the interfacial clay was transformed by dissolution of calcite and clay minerals and precipitation of siderite close to the original surface. Silica released upon clay dissolution diffused into the corrosion layer and coprecipitated with oxidized Fe to form Fe-phyllosilicate. 相似文献
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The stable copper isotope composition of 79 samples of primary and secondary copper minerals from hydrothermal veins in the Schwarzwald mining district, South Germany, shows a wide variation in δ65Cu ranging from −2.92 to 2.41‰. We investigated primary chalcopyrite, various kinds of fahlores and emplectite, as well as supergene native copper, malachite, azurite, cuprite, tenorite, olivenite, pseudomalachite and chrysocolla. Fresh primary Cu(I) ores have at most localities copper isotope ratios (δ65Cu values) of 0 ± 0.5‰ despite the fact that the samples come from mineralogically different types of deposits covering an area of about 100 by 50 km and that they formed during three different mineralization events spanning the last 300 Ma. Relics of the primary ores in oxidized samples (i.e., chalcopyrite relics in an iron oxide matrix with an outer malachite coating) display low isotope ratios down to −2.92‰. Secondary Cu(I) minerals such as cuprite have high δ65Cu values between 0.4 and 1.65‰, whereas secondary Cu(II) minerals such as malachite show a range of values between −1.55 and 2.41‰, but typically have values above +0.5‰. Within single samples, supergene oxidation of fresh chalcopyrite with a δ value of 0‰ causes significant fractionation on the scale of a centimetre between malachite (up to 1.49‰) and relict chalcopyrite (down to −2.92‰). The results show that—with only two notable exceptions—high-temperature hydrothermal processes did not lead to significant and correlatable variations in copper isotope ratios within a large mining district mineralized over a long period of time. Conversely, low-temperature redox processes seriously affect the copper isotope compositions of hydrothermal copper ores. While details of the redox processes are not yet understood, we interpret the range in compositions found in both primary Cu(I) and secondary Cu(II) minerals as a result of two competing controls on the isotope fractionation process: within-fluid control, i.e., the fractionation during the redox process among dissolved species, and fluid-solid control, i.e., fractionation during precipitation involving reactions between dissolved Cu species and minerals. Additionally, Rayleigh fractionation in a closed system may be responsible for some of the spread in isotope compositions. Our study indicates that copper isotope variations may be used to decipher details of natural redox processes and therefore may have some bearing on exploration, evaluation and exploitation of copper deposits. On the other hand, copper isotope analyses of single archeological artefacts or geological or biological objects cannot be easily used as reliable fingerprint for the source of copper, because the variation caused by redox processes within a single deposit is usually much larger than the inter-deposit variation. 相似文献
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John Dodson Xiaoqiang Li Ming Ji Keliang Zhao Xinying Zhou Vladimir Levchenko 《Quaternary Research》2009,(3):309-314
Understanding of the origin and development of bronze technology in eastern Asia remains unresolved. Here we report on the distribution of copper and associated cations in sediments from Huoshiliang in northwestern Gansu, China, strontium and lead isotope analyses of ore and slag samples, and some artifact fragments at archaeological sites at Ganggangwa and Huoshiliang in the Black River valley.We conclude that bronze production began perhaps as early as 2135 BC and that the Baishantang modern mine site at Dingxin was a possible source of copper ore. There was at least one other, but currently unidentified, source of ore. The Bronze Age people were also farmers and planted cereals such as wheat, and they may have abandoned the region when wood was exhausted and desertification took over. 相似文献
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探讨了利用青铜器内残留的陶范或泥芯示踪青铜器产地的可行性。采用偏光显微镜、XRD、XRF、NAA等技术手段,测试分析了湖北九连墩楚墓青铜器内的泥芯,发现九连墩外来风格青铜器的泥芯,在物相、微观结构、化学成分、植硅体组合等方面与本地风格青铜器的泥芯有较大差异。外来风格青铜器的泥芯,其CaO含量很高,达6%以上,而Na2O的含量相对较低,这一富钙、贫钠的特点,与中国黄土的典型特征极为吻合。结合泥芯中的植硅体组合特征,推测九连墩外来风格的青铜器很可能来自中国北方黄土堆积地区,系当地铸造后输入到楚国的。本研究表明利用青铜器内的泥芯或陶范残留,可望有效地示踪青铜器的产地。 相似文献
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一种亟待重新认识的铜矿床——滇中土状铜矿 总被引：2，自引：0，他引：2
滇中土铜矿长期被认为是一种不可利用的铜矿床,新的湿法冶金技术应用使之成为了效益型铜资源。滇中土状铜矿产于中元古界昆阳群落雪组的土状风化壳内,分为面型和线型两种矿床类型。主要铜矿物为孔雀石、硅孔雀石、微粒状赤铜矿和黑铜矿、少量残余含铜硫化物。其矿石平均品位同于原生硫化矿。与原生矿石相比,土状氧化铜矿石ＳｉＯ２、Ａｌ２Ｏ３、Ｆｗ２Ｏ３、Ｍｎｏ明显富集,ＣａＯ与ＭｇＯ大量淋失,由碱性矿石变成了可酸浸的非 相似文献
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采用X射线荧光光谱、X射线衍射等测试手段,对大冶李德贵冶炼遗址矿冶遗物进行了物理测试、成分分析和物相分析。物理测试结果表明,遗址炼渣的熔融温度高于1280℃;成分分析结果表明,李德贵炼渣中铜含量很低,远低于炼铜渣的铜含量;而其铁含量很高,与欧洲早期铁器时代和罗马时代的块炼铁渣相近;物相分析结果表明,李德贵炼渣的主要物相与炼铜渣没有区别,但炼铜渣中发现一些铜氧化矿和硫化矿。结合对其他冶炼遗物的分析,可以初步判断该冶炼遗址是一处炼铁遗址。工作台面上发现的炼渣与铁矿石的混合物,表明古人很可能已将炼渣回收利用,与铁矿石原料一起回炉冶炼。 相似文献