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Journal articles on the topic 'Lead deposits'

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Published: 4 June 2021
Last updated: 14 February 2022

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1

Dejonghe, Léon. "Zinc–lead deposits of Belgium." Ore Geology Reviews 12, no. 5 (September 1998): 329–54. http://dx.doi.org/10.1016/s0169-1368(98)00007-9.

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2

Makeev, S. M., E. A. Muromtsev, V. A. Makarov, and G. V. Belokonov. "FEATURES OF LEAD AND ZINC METALLOGENY WITHIN THE YENISEI RIDGE." Ores and metals, no. 3 (November 11, 2020): 68–84. http://dx.doi.org/10.47765/0869-5997-2020-10022.

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Information collected on deposits, ore occurrences, and lead and zinc mineralization points known within the Yenisei Ridge is provided. A summary of the latest data on the geology and metallogeny of lead and zinc in the region is presented. A brief description of the deposits is given and their ore formation typification is carried out. The position of deposits in a stratigraphic section, the relationship with geological formations and tectonic structures, and subsequent conclusions about deposit location patterns and metallogenic zonality of the area were examined. The position analysis of polymetallic mineralization in regional geophysical and geochemical field revealed the presence of lead → zinc → barium trend from the Ishimbinsk fault towards the Siberian platform and the potential discovery of economically significant polymetallic mineralization in the eastern Yenisei Ridge.
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3

Idzikowska, Krystyna. "Preliminary research on lead absorption and translocation in root tip cells of Populus nigra "Italica" Moench." Acta Societatis Botanicorum Poloniae 57, no. 2 (2014): 217–22. http://dx.doi.org/10.5586/asbp.1988.021.

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Observations were carried out to define the place of lead absorption within three regions of the poplar adventitious root tip (<em>Populus nigra</em> "Italica" Moench.) after 24-hour exposure to a solution of Pb(N0<sub>3</sub>)<sub>2</sub> (25 mg dm<sup>-3</sup> Pb). Deposits of lead were not observed in certain cells of the apical part of the meristem. In other cells, lead deposits were first observed in the lumen of several endomembrane compartments - the endoplasmic reticulum, dictyosomal stacks and nuclear envelope. Certain differences were noted in the amount of deposits in protoplasts with varied electron density. In the cells with greater deposits, lead was also observed in the cytoplasm, the mitochondria and the paramural bodies. Practically no lead precipitated in the cell wall. The presence of lead in the form of small deposit granules in the plasmodesmata may suggest transfer from cell to cell.
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4

Rotemberg, Julio J. "A Behavioral Model of the Popularity and Regulation of Demandable Liabilities." American Economic Journal: Macroeconomics 7, no. 3 (July 1, 2015): 123–52. http://dx.doi.org/10.1257/mac.20130143.

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Overoptimism regarding one's ability to arrive early in a queue is shown to rationalize deposit contracts in which people can withdraw their funds on demand even if consumption takes place later. Capitalized institutions serving overoptimistic depositors emerge in equilibrium even if depositors and bank owners have identical preferences and investment opportunities. Consistent with the evidence, runs can lead people to move their deposits from one intermediary to another. Regulatory policies, including deposit insurance, minimum capital requirements and restrictions on the assets held by depository institutions can increase the ex ante welfare of depositors. (JEL G21, G28, G32, L51)
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5

Arping, Stefan. "Capital Regulation and Bank Deposits*." Review of Finance 23, no. 4 (June 13, 2018): 831–53. http://dx.doi.org/10.1093/rof/rfy019.

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Abstract Recent literature suggests that higher capital requirements for banks might lead to a socially costly crowding out of deposits by equity. This paper shows that additional equity in banks can help to crowd in deposits. Intuitively, as banks have more equity and become safer, the cost of deposit funding may decline; this, in turn, can encourage banks to expand their deposits. However, I also find that, for this effect to occur, capital requirements may have to be stringent enough: When bank capital is low, a small rise in capital requirements can cause banks to substitute equity for deposits. Overall, a non-monotonic relationship between the required amount of equity in banks and their level of deposit funding obtains.
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6

Hartog, F. A., G. Jonkers, A. P. Schmidt, and R. D. Schuiling. "Lead Deposits in Dutch Natural Gas Systems." SPE Production & Facilities 17, no. 02 (May 1, 2002): 122–28. http://dx.doi.org/10.2118/78147-pa.

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7

Stroud, Sally, and Janet Dyer. "Flecainide Treatment May Lead to Corneal Deposits." AJN, American Journal of Nursing 91, no. 11 (November 1991): 51. http://dx.doi.org/10.1097/00000446-199111000-00015.

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8

Stroud, Sally, and Janet Dyer. "Flecainide Treatment May Lead to Corneal Deposits." AJN, American Journal of Nursing 91, no. 11 (November 1991): 51. http://dx.doi.org/10.1097/00000446-199191110-00015.

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9

Sangster, D. F., P. M. Outridge, and W. J. Davis. "Stable lead isotope characteristics of lead ore deposits of environmental significance." Environmental Reviews 8, no. 2 (February 1, 2000): 115–47. http://dx.doi.org/10.1139/a00-008.

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Stable Pb isotopes are increasingly used in environmental science as tracers of natural and anthropogenic Pb sources. This review provides a summary of the recent geological literature concerning Pb isotopes in global Pb ore deposits. The isotopic characteristics of 151 Pb deposits, including 78 20th-century producing mines, have been summarized using the 204Pb-based ratios common to geological science and the 206Pb- and 207Pb-based ratios (i.e., excluding 204Pb) more often employed in environmental studies. A number of current mines, including those exploiting several Australian, Scandinavian, and U.S.A. deposits, have extreme isotopic compositions that provide unique signatures. However, a majority of mines (and unproductive deposits) fall within a relatively narrow range:206Pb/207Pb of 1.15-1.22 and 208Pb/207Pb of 2.42-2.50. In some contexts, unequivocal identification of a source exhibiting one of these common signatures would be difficult, especially with the relatively low precision (ca. 0.2-0.5% RSD) of quadrupole inductively coupled plasma - mass spectrometry (ICP-MS) which has been the most common instrument for environmental Pb isotope measurements. In settings with disparate industrial and natural Pb signatures (i.e., sources withisotopic ratios differing by about 2% or more), ICP-MS precision is adequate for source discrimination. Statistical analyses suggested that while 204Pb is critical for identifying a small proportion of environmental Pb sources, about 86% of the source discrimination power is due to the 206Pb, 207Pb, and 208Pb isotopes. Thus, the requisite analytical precision, rather than a lack of 204Pb data, is the most critical issue with respect to unequivocal identification of Pb sources in most cases. Several factors, especially the increasing dominance of recycling in global Pb production and the international transportation of ore concentrate and refined Pb, may cause unpredictable changes in the isotopic signatures of industrial sources,with a long-term trend towards homogenization. More frequent,comprehensive, and high-precision isotopic characterization of possible point and non-point Pb emitters such as gasoline, smelters, and battery-recycling plants, together with increased efforts to document the origin of constituent leads in industrial sources, would help to address these concerns.Key words: lead isotopes; lead pollution; source identification; lead ore deposits.
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10

Gulson, Brian L. "Shale-hosted lead-zinc deposits in northern Australia; lead isotope variations." Economic Geology 80, no. 7 (November 1, 1985): 2001–12. http://dx.doi.org/10.2113/gsecongeo.80.7.2001.

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11

Lien, Nguyen Thi, and Nguyen Van Pho. "Formation of secondary nonsulfide zinc ore in Cho Dien Pb-Zn deposits." VIETNAM JOURNAL OF EARTH SCIENCES 40, no. 3 (June 4, 2018): 228–39. http://dx.doi.org/10.15625/0866-7187/40/3/12615.

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In Viet Nam, non-sulfide zinc ore in the Cho Dien deposit has been exploited for a long time. Up to the present, zinc ore remains the major exploited ore in Cho Dien. There are numerous studies of Pb-Zn ore in Cho Dien. However, most of the studies have dedicated only to description of mineralogical and chemical composition of Pb-Zn ore. There has been no publication on this non-sulfide zinc ore. Based on the mineralogical studies, the content of Pb and Zn in groundwater determined by reflective microscope, SEM, EPMA and ICP-MS methods, the study explained the formation of secondary non-sulfide zinc ore in the Cho Dien deposit. Strong weathering process makes the upper part of ore bodies completely oxidized. Difference in geochemical behavior of lead (Pb) and zinc (Zn) in the oxidation process of Pb-Zn ore is the reason to form non-sulfide zinc ore in the Cho Dien deposit. Oxidation of primary Pb-Zn ore is mainly sphalerite, pyrite, galena minerals which creates a low pH environment and transforms of zinc from immobile (sphalerite - ZnS) to mobile (Zn2+) and retained in solution under acid pH conditions whereas lead has the tendency to form soluble minerals (anglesite, cerussite). The acid neutralization actions of the surrounding rocks make zinc precipitate, to form secondary non-sulfide zinc minerals.ReferencesAndreas Nuspl, 2009. Genesis of nonsulfide zinc deposits and their future utilization (www.geo.tu-frei berg.de/oberseminar/OS_09/Andreas_Nuspl.pdf.Boland M.B., et al., 2003. The Shaimerden supergene zinc deposit, Kazakhstan: Economic Geology, 98(4), 787-795.Chau N.D., Jadwiga P., Adam P., D.V. Hao, L.K. Phon, J. Paweł, 2017. General characteristics of rare earth and radioactive elements in Dong Pao deposit, Lai Chau, Vietnam, Vietnam J. Earth Sci., 39(1), 14-26.Dao Thai Bac, 2012. Characteristics and distribution law of lead-zinc metallogenic fomations in Viet Bac region. Doctoral thesis.Heyl A.V., Bozion C.N., 1962. Oxidized zinc deposits of the United States, Part 1. General Geology: U.S. Geological Survey Bulletin 1135-A.Hoa T.T., et al., 2010. By-products in lead-zinc and copper ores of Northeast Vietnam. J. Sci. of the Earth, 289-298 (in Vietnamese).Hoang Minh Thao, Tran Thi Hien, Dao Duy Anh, Pham Thi Nga, 2017. Mineralogical characteristics of graphite ore from Bao Ha deposit, Lao Cai Province and proposing a wise use. Vietnam J. Earth Sci., 39(4), 324-336.Jurjovec J., et al., 2002. Acid neutralization mechanisms and metal release in mine tailings: A laboratory column experiment: Geochimica et Cosmochimica Acta, 66, 1511-1523.Large D., 2001. The geology of non-sulphide zinc Deposits - an Overview: Erzmetall, 54(5), 264-276.Maria Boni, 2003. Nonsulfide Zinc Deposits: a new - (old) type of economic mineralization. Society for geology applied to mineral deposits (SGA) News, Number 15. https://www.e-sga.org/fileadmin/sga/newsletter/news15/art01.html.McPhail D.C., et al., 2003, The geochemistry and mobility of zinc in the regolith: in Roach, I.C., ed., Advances in Regolith, 287-291.Murray W. Hitzman, et al., 2003. Classification, genesis, and exploration guides for non-sulfide zinc deposits: Economic Geology, 98(4), 685-714.Nguyen V.P., 2013. Wet tropical wethering in Viet Nam. Natural Science and Technology Publisher.Nicola Mondillo, 2013. Supergene Nonsulfide Zinc-Lead Deposits: The Examples of Jabali (Yemen) and Yanque (Peru). Doctoral thesis.Nordstrom D.K., Alpers C.N., 1999. Geochemistry of acid mine waste. Review in Economic Geology, the environmental geochemistry of ore deposits/Eds. G.S.Plumlee, M.J. Logsdon. Part A: Processes, techniques, and health issues, 6A, 133-160.Reynolds N.A., et al., 2003. The Padaeng Supergene Nonsulfide Zinc Deposit, Mae Sod, Thailand. Economic Geology, 98(4), 773-785.Sangameshwar S.R., Barnes H.L., 1983. Supergene Processes in Zinc-Lead-Silver Sulfide Ores in Carbonates: Economic Geology, 78, 1379-1397.Stumm W., Morgan J.J., 1996. Aquatic Chemistry, Third Edition. John Wiley & Sons, New York, NY.Takahashi T., 1960. Supergene alteration of zinc and lead deposits in limestone: Economic Geology, 55, 1083-1115.Thornber M.R. and Taylor G.F., 1992. The mechanisms of sulphide oxidation and gossan formation, in: Butt, C.R.M., and Zeegers H., (Eds.)., Regolith exploration geochemistry in tropical and subtropical terrains, in Govett G.J.S., ed., Handbook of exploration geochemistry: Amsterdam, Elsevier, 4, 119-138.Tran Trong Hoa, 2005. Potential assessment of By- products in lead-zinc and copper deposits of Northeast Vietnam. Final report.Tran Tuan Anh, 2010. Studying accompanying component in the types of potential deposits of basic metals and precious - rare metals of north Viet Nam to improve the efficiency of mining and environmental protection. Final report. KC.08.24/06-10.Tran Tuan Anh, et al., 2011. Mineralogical and geochemical characteristics and forming conditions of lead - zinc deposits in Lo Gam structure, northern Vietnam. J. Sci. of the Earth, 33(3DB), 393-408 ( in Vietnamese).Vito Coppola et al., 2009. Nonsulfide zinc deposits in the Silesia - Cracow district, Southern Poland. Springer Link, 44, 559-580.Vito Coppola, et al., 2007. Non-sulfide zinc deposits in Upper Silesia, Southern Poland. Proceeding of the Ninth Biennial SGA Meeting, Dublin, 1401-1404.Williams P.A., 1990. Oxide zone geochemistry: Ellis Horwood Ltd., Chichester, UK, 286p.
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12

Wang, Kun, and Ke Yan Xiao. "Three-Dimensional Modeling of MVT Lead-Zinc Deposit in Western Hunan and its Application." Applied Mechanics and Materials 644-650 (September 2014): 2674–77. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.2674.

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In order to study the evolution and metallogenic regularity of MVT lead-zinc deposits in western portion of Hunan province (China), two sets of three-dimensional model are established by Minexplorer software: 3D model in typical deposit and 3Dmodel on regional scale. On the basis of synthetic analyses of two sets of models, the further prospecting should be focused on the north part of ore-bearing layer along the Huayuan-Zhangjiajie fault belt. It is effective to observe occurrence and distribution characteristics from the 3D geological model, and to provide the basis for further exploration prospecting of the concealed deposits.
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13

P Marshall, Craig, Karen L Mackenzie, Junhong Chen, Dorothy Z Oehler, Graham A Logan, and Malcolm R Walter. "Microbes, organic matter and ore deposits." Microbiology Australia 25, no. 1 (2004): 36. http://dx.doi.org/10.1071/ma04136.

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The 1640 Ma (million years old) Here?s Your Chance (HYC) deposit at McArthur River, Northern Territory, Australia is one of the largest and least metamorphosed lead-zinc-silver deposits in the world. The mineralised interval has been divided into several orebodies and is separated by relatively barren sediment.
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14

Jian, Long, Fu Ju Jia, and Yan Dao. "Geochemical Characteristics of Ore-Bearing Strata of Pb-Zn Deposits in the Sichuan-Yunnan-Guizhou Border Area in Southwest China." Advanced Materials Research 868 (December 2013): 113–16. http://dx.doi.org/10.4028/www.scientific.net/amr.868.113.

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The Pb-Zn deposits (or points) with different ages of ore-bearing strata are counted in in the paper. Through discussing the lithology and elemental geochemistry in ore-bearing strata to explain the lead element and zinc element relate to strata and lithology, the author suggested the lead-zinc deposit mainly were exposed in specific stratum, considering the deposits was obviously was controlled by stratum and was greatly influenced by lithology. For this reason, combining with the comparative study of element abundances in rock, it has maily demonstrated the relevance of ore-forming elements.
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15

Swinden, H. Scott, T. E. Lane, and R. I. Thorpe. "Lead-isotope compositions of galena in carbonate-hosted deposits of western Newfoundland: evidence for diverse lead sources." Canadian Journal of Earth Sciences 25, no. 4 (April 1, 1988): 593–602. http://dx.doi.org/10.1139/e88-057.

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Carbonate-hosted zinc and lead deposits occur in two settings in the Humber Terrane of western Newfoundland: (i) associated with dolomitized units and breccias in Cambrian and Ordovician shelf-facies carbonate rocks; and (ii) as open-space, vein, and breccia fillings associated with calcite within or near the margins of Carboniferous basins. We report 11 new lead-isotope analyses from deposits of the former type on the Great Northern Peninsula (the GNP suite) and 8 new analyses from deposits of the latter type on the Port au Port Peninsula and the northern part of the Bay St. George subbasin (BSG suite).The isotopic composition of lead in galena from the GNP suite defines linear trends in which the lead-isotope ratios increase with stratigraphic height in the Cambro-Ordovician sequence. These trends are interpreted as mixing lines; samples at the non-radiogenic end have very low 207Pb/204Pb but high 208Pb/204Pb ratios relative to 206Pb/204Pb and are interpreted as representing substantial evolution in high-grade metamorphic rocks of the Grenville Structural Province that underlie the sedimentary succession. The more radiogenic source(s?) is probably located within the sedimentary pile and contributed metals to the fluids during their migration to the deposition sites.Lead isotopes in deposits in the Bay St. George area cluster near average crustal model growth curves. Metal sources for these deposits, considered by previous workers as diagenetic in origin, are interpreted as being clastic sediments within the sedimentary basin.
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16

Bybee, Karen. "Inhibition of Lead and Zinc Sulphide Scale Deposits." Journal of Petroleum Technology 53, no. 03 (March 1, 2001): 61–62. http://dx.doi.org/10.2118/0301-0061-jpt.

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17

Leach, D. L., D. C. Bradley, D. Huston, S. A. Pisarevsky, R. D. Taylor, and S. J. Gardoll. "Sediment-Hosted Lead-Zinc Deposits in Earth History." Economic Geology 105, no. 3 (May 1, 2010): 593–625. http://dx.doi.org/10.2113/gsecongeo.105.3.593.

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18

Sass-Gustkiewicz, Maria, and Henryk Kucha. "7-2: Zinc–Lead deposits, Upper Silesia, Poland." Ore Geology Reviews 27, no. 1-4 (November 2005): 269. http://dx.doi.org/10.1016/j.oregeorev.2005.07.011.

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19

Fouquet, Y., and E. Marcoux. "Lead isotope systematics in Pacific hydrothermal sulfide deposits." Journal of Geophysical Research: Solid Earth 100, B4 (April 10, 1995): 6025–40. http://dx.doi.org/10.1029/94jb02646.

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20

Than Htun, Aung Kyin, and Khin Zaw. "Chapter 27 Lead–zinc–silver deposits of Myanmar." Geological Society, London, Memoirs 48, no. 1 (2017): 589–623. http://dx.doi.org/10.1144/m48.27.

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21

Standish, Christopher D., Bruno Dhuime, Chris J. Hawkesworth, and Alistair W. G. Pike. "A Non-local Source of Irish Chalcolithic and Early Bronze Age Gold." Proceedings of the Prehistoric Society 81 (April 8, 2015): 149–77. http://dx.doi.org/10.1017/ppr.2015.4.

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Lead isotope analyses of 50 Irish Chalcolithic and Early Bronze Age gold artefacts favour a gold source in southern Ireland. However when combined with major element analysis, the artefacts are not consistent with any Irish gold deposit analysed to date. Understanding the lead isotope signatures of ore deposits within a study region allows informed inferences to be drawn regarding the likelihood that an unanalysed ore deposit was exploited in the past. If an Irish gold source is assumed, then the gold is most likely to have originated from deposits hosted by Old Red Sandstone in the Variscan ore field of south-west Ireland. However, based on our current understanding of mineralisation in the region, this scenario is considered unlikely. A non-Irish source for the gold is therefore preferred – a scenario that may favour cosmologically-driven acquisition, ie, the deliberate procurement of a material from distant or esoteric sources. Available geochemical data, combined with current archaeological evidence, favour the alluvial deposits of south-west Britain as the most likely source of the gold.
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22

Goldsmith, L. B., A. J. Sinclair, and P. B. Read. "Exploration implications of production and location data for Ag-rich vein deposits, Trout Lake mining camp, southeastern B.C." Canadian Journal of Earth Sciences 23, no. 10 (October 1, 1986): 1627–40. http://dx.doi.org/10.1139/e86-152.

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Ore tonnage production data from 43 former producers in the Trout Lake mining camp are examined using plots of spatial density of deposits and statistical methods. Outlines of mineral belts are established from spatial density with the 0.5 deposit per 4 km2 contour. Probability plots of ore tonnages distinguish two lognormal populations of deposits. Probablity plots of metal grades show four lognormal populations of silver and two of gold. A metal content versus ore tonnage graph draws attention to the similarity in proportions of metals produced from high-tonnage and from medium- + low-tonnage deposits. Triangular graphs of metal contents emphasize the direct relationship between silver and lead; metal ratios suggest some relationships that may be dependent upon host rocks. Linear correlation coefficients of tonnage and metal content show an inverse relationship between tonnage and precious metals and a direct relationship between silver and lead. Multiple regression models established between production tonnages and average grades can estimate deposit size within one order of magnitude.Systematic evaluation of quantitative production and location data can augment exploration decisions.
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23

Hu, Yun Hu, Xi Jun Liu, and Xiang Rong Luo. "Geoelectrochemical-Extraction Measurement Method to Look for Hidden Lead-Zinc Ore Deposit and Prospecting Effect." Advanced Materials Research 734-737 (August 2013): 95–99. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.95.

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The geoelectrochemical-extraction measurement is a ore prospecting method of deep-penetrating geochemistry, by using the element receptors to extract the mobile metal ions from the soil under the artificial electric field to look for the hidden ore deposit. The study of using the geoelectrochemical-extraction measurement method to look for blind lead-zinc ore deposit has been carried out in the Fuzichong lead-zinc polymetallic ore deposit and Panlong lead-zinc ore deposit of Guangxi, which resulted in the clearly geoelectrochemical anormaly above the known ore bodies. And the ore prospecting forecast conducted in the unknown ore regions shows that it is feasible to use the geoelectrochemical-extraction measurement method to expore the deep hidden lead-zinc ore deposits.
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24

Silin, Ivan, Klaus Hahn, Devrim Gürsel, Dario Kremer, Lars Gronen, Srećko Stopić, Bernd Friedrich, and Hermann Wotruba. "Mineral Processing and Metallurgical Treatment of Lead Vanadate Ores." Minerals 10, no. 2 (February 22, 2020): 197. http://dx.doi.org/10.3390/min10020197.

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Vanadium has been strongly moving into focus in the last decade. Due to its chemical properties, vanadium is vital for applications in the upcoming renewable energy revolution as well as usage in special alloys. The uprising demand forces the industry to consider the exploration of less attractive sources besides vanadiferous titanomagnetite deposits, such as lead vanadate deposits. Mineral processing and metallurgical treatment of lead vanadate deposits stopped in the 1980s, although the deposits contain a noteworthy amount of the desired resource vanadium. There has been a wide variety of research activities in the first half of the last century, including density sorting and flotation to recover concentrates as well as pyro- and hydrometallurgical treatment to produce vanadium oxide. There have been ecological issues and technical restrictions in the past that made these deposits uninteresting. Meanwhile, regarding the development of mineral processing and metallurgy, there are methods and strategies to reconsider lead vanadates as a highly-potential vanadium resource. This review does not merely provide an overview of lead vanadate sources and the challenges in previous mechanical and metallurgical processing activities, but shows opportunities to ensure vanadium production out of primary sources in the future.
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Galyamov, A. L., A. V. Volkov, K. Yu Murashov, N. V. Sidorova, and T. P. Kuznetsova. "Prospects for identifying the Mississippi Valley type deposits in the North-East of Russia." LITHOSPHERE (Russia) 20, no. 2 (April 25, 2020): 254–70. http://dx.doi.org/10.24930/1681-9004-2020-20-2-254-270.

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Research subject. The Mississippi Valley type deposits make up about a third of the global balance of lead and zinc reserves, resources and production. Additionally, silver, antimony, arsenic, barium, bismuth, cadmium, cobalt, gallium, indium, mercury, molybdenum, nickel and thallium can be present in the ores of these deposits. In the North-East of Russia, the Mississippi Valley type of deposits is poorly represented. In this work, we investigate the deposits of the Sardana ore cluster of the Republic of Sakha (Yakutia) and individual deposits of the Magadan region. Materials and methods. The article discusses the results of previous scientific research and new data on the geochemical features, isotopic composition of ores and geological and structural conditions for the formation of the Sardana cluster deposit. In addition, the potential for identifying stratiform lead-zinc deposits is associated with favourable geodynamic conditions in the region, as well as with the refinement and adaptation of the forecast-search model of MVT deposits for the North-East of Russia. Results. The mineralogical and geochemical features of the rocks and ores of the Sardana cluster deposits, the morphology of ore bodies, their zoning elements, as well as isotopic ratios indicate that the ores are likely to be of the Mississippi Valley type with the onset of ore deposition at early diagenetic and catagenetic stages. The distribution of rare elements indicates a significant role of superimposed metamorphism of the host carbonate-terrigenous strata in the deposition of the ores of producing stages. Conclusion. The potential possibility of increasing the mineral and raw material base of lead and zinc is associated with the identification of sedimentary basins with a stagnant anoxic regime of carbonate accumulation in the immediate vicinity of the development areas of rift complexes, as well as with the presence of other critically important forecast-search signs. In addition to the well-known Killakh metallogenic zone, Tuora-Sis and Orulgan metallogenic taxa located in the north of the Republic of Sakha (Yakutia) with known stratiform manifestations of lead and zinc belong to such areas.
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26

Egan, Mark, Ali Hortaçsu, and Gregor Matvos. "Deposit Competition and Financial Fragility: Evidence from the US Banking Sector." American Economic Review 107, no. 1 (January 1, 2017): 169–216. http://dx.doi.org/10.1257/aer.20150342.

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We develop a structural empirical model of the US banking sector. Insured depositors and run-prone uninsured depositors choose between differentiated banks. Banks compete for deposits and endogenously default. The estimated demand for uninsured deposits declines with banks' financial distress, which is not the case for insured deposits. We calibrate the supply side of the model. The calibrated model possesses multiple equilibria with bank-run features, suggesting that banks can be very fragile. We use our model to analyze proposed bank regulations. For example, our results suggest that a capital requirement below 18 percent can lead to significant instability in the banking system. (JEL E44, G01, G21, G28, G32)
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27

Nikiforov, Alexander. "ORE CONTROL OF KHIZOVAARA STRUCTURE DEPOSITS." SWS Journal of EARTH AND PLANETARY SCIENCES 1, no. 1 (June 1, 2019): 11–24. http://dx.doi.org/10.35603/eps2019/issue1.02.

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Abstract Ore-controlling factors determine the patterns of formation and localization of mineralization within ore regions and deposits. The need for this study arises from the importance of integrated assessment of mineral resources and improvement of metasomatic formation techniques. This is especially important for geological materials which are mined for their direct commercial value (industrial materials). This article is devoted to the study of the ore control of complex industrial minerals. The Khizovaara structure belongs to the Tikshozero greenstone belt. Within the structure, a multistage metamorphism and metasomatism processes are manifested. The totality of lithological, structural and petrologic ore control factors determines the existence within the structure of several deposits. These are deposits of industrial minerals, such as garnet, quartz, muscovite, kyanite, staurolite. In almost all cases, the ores are complex. The following objects were studied: Southern Lens (kyanite + quartz) deposit, Northern lens (kyanite + quartz) deposit, East Khizovaara (muscovite + quartz) deposit, Vysota-181 (garnet + staurolite + kyanite + muscovite + quartz) deposit, ore occurence Fuxit (decorative rocks). For the ores of each site, the processes of regional metamorphism of the amphibolite facies of kyanite-biotite and muscovite-chlorite-kyanite subfacies are important. Metamorphism, tectonic regime and geological connection with rocks has been studied as a ore control factor, based on this, data on the quantitative distribution of industrial minerals of metamorphic genesis have been obtained. Acidic and alkaline metasomatites of each site are considered. On the basis of these data, metasomatic processes that lead to the formation of complex ores are revealed. The process of superposition of metasomatosis products of the late stage on the products of early stage metasomatosis was studied. This process leads to the formation of complex ores of three or four minerals. The result of the work is a general scheme of metamorphic and metasomatic ores control
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Zloto, Ofira, Mordechai Rosner, and Vicktoria Vishnevskia-Dai. "Yellow subconjunctival deposits." BMJ Case Reports 12, no. 7 (July 2019): e230370. http://dx.doi.org/10.1136/bcr-2019-230370.

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In this case report, we present a healthy man who was referred for removal of subconjunctival yellow lesions found during a routine eye examination. In histopathological examination, an amyloidosis was found. There were no remnants or new lesions during 1-year follow-up. There was no systemic involvement. Conjunctival amyloidosis is a rare diagnosis that often is overlooked. Failure to recognise conjunctival amyloidosis might lead to late diagnosis of systemic amyloidosis. This case may rise the awareness to this rare diagnosis.
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Cheng, Jin, Xiao Ping Zou, Xiang Min Meng, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, and Yuan Yang. "Electrochemical Deposition of Metallic Lead Particle Film." Advanced Materials Research 123-125 (August 2010): 423–26. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.423.

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The preparation of metallic lead films by electrochemical deposition was reported. Although primary deposits at fresh state (also referred to as fresh deposits) were indeed metallic lead films, the fresh lead films could be rapidly oxidized to lead oxide in air. To obtain long stable metallic lead films, the key process is how to prevent the oxidization of fresh lead films. Our studies indicate that the washing of fresh metallic lead films in absolute alcohol is a simple but effective method to protect the lead films from the oxidization for an extended period of more than 20 days.
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30

Macmillan-Jones, J. G., F. A. Londry, and A. J. Slavin. "Oxygen uptake by thin lead deposits on polycrystalline gold." Surface Science 186, no. 3 (August 1987): 357–75. http://dx.doi.org/10.1016/s0039-6028(87)80381-3.

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31

Kvech, Steven, and Marc Edwards. "Role of Aluminosilicate deposits in Lead and Copper Corrosion." Journal - American Water Works Association 93, no. 11 (November 2001): 104–12. http://dx.doi.org/10.1002/j.1551-8833.2001.tb09339.x.

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32

Li, Zhaolin, Hongzhong Guo, and Lihong Lie. "Organic geochemistry of lead-zinc polymetallic deposits, northern Guangdong." Chinese Journal of Geochemistry 16, no. 4 (October 1997): 330–35. http://dx.doi.org/10.1007/bf02870917.

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Macmillan-Jones, J. G., F. A. Londry, and A. J. Slavin. "Oxygen uptake by thin lead deposits on polycrystalline gold." Surface Science Letters 186, no. 1-2 (July 1987): A288. http://dx.doi.org/10.1016/0167-2584(87)90632-3.

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34

Macmillan-Jones, J. G., F. A. Londry, and A. J. Slavin. "Oxygen uptake by thin lead deposits on polycrystalline gold." Surface Science Letters 186, no. 3 (August 1987): 288–89. http://dx.doi.org/10.1016/0167-2584(87)91278-3.

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35

Dando, Kevin J., and Douglas R. Glasson. "Vacuum microbalance studies of lead deposits from natural waters." Thermochimica Acta 152, no. 1 (October 1989): 87–96. http://dx.doi.org/10.1016/0040-6031(89)85377-8.

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36

Thomassen, B. "The gold and base metal potential of the Lower Proterozoic Karrat Group, West Greenland." Rapport Grønlands Geologiske Undersøgelse 155 (January 1, 1992): 57–66. http://dx.doi.org/10.34194/rapggu.v155.8182.

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The mineral potential of the Karrat Group in West Greenland became important after exhaustion in 1990 of the Black Angel lead-zinc mine situated within this supracrustal unit. It consists of shelf and turbidite type metasediments and subordinate metavolcanics deposited in an epicontinental marginal basin. Known mineralization comprises the Black Angel deposit and a number of other marble-hosted lead-zinc occurrences, as well as extensive sulphide facies iron formations and vein type base and precious metals mineralisation in quartzites and metagreywackes. Further areas with anomalously high contents of both base metals and gold-arsenic-tungsten are indicated by drainage geochemistry. The mineral potential of the Karrat Group is for massive base metal sulphide deposits hosted in marbles or clastic metasediments, and turbidite hosted gold-bearing veins and shear zones.
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37

Nimis, Paolo, Paolo Omenetto, Ilaria Giunti, Gilberto Artioli, and Ivana Angelini. "Lead isotope systematics in hydrothermal sulphide deposits from the central-eastern Southalpine (northern Italy)." European Journal of Mineralogy 24, no. 1 (February 24, 2012): 23–37. http://dx.doi.org/10.1127/0935-1221/2012/0024-2163.

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38

Chiaradia, Massimo, Lluís Fontboté, and Agustín Paladines. "Metal Sources in Mineral Deposits and Crustal Rocks of Ecuador (1° N–4° S): A Lead Isotope Synthesis." Economic Geology 99, no. 6 (September 1, 2004): 1085–106. http://dx.doi.org/10.2113/econgeo.99.6.1085.

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Abstract Ecuador consists of terranes having both continental (Chaucha, Tahuin, Loja terranes) and oceanic (Macuchi, Alao, Salado terranes) affinity, which were accreted to the Amazon craton from Late Jurassic to Eocene. Four main magmatic arcs were formed by the subduction of the Farallon/Nazca plate since the Jurassic: a Jurassic continental arc on the western margin of the Amazon craton, a Jurassic island arc (Alao terrane), an early Tertiary island arc (Macuchi terrane), and a middle-late Tertiary continental arc encompassing the terranes of Macuchi, Chaucha, Tahuin, Loja, and Alao after complete assembly of the Ecuadorian crust. Mineral deposits formed during these magmatic arc activities include porphyry-Cu and gold skarn deposits in association with the Jurassic continental arc, polymetallic volcanic-hosted massive sulfide deposits (VHMS) in association with the Jurassic island arc of Alao, Au-Cu-Zn VHMS deposits in association with the early Tertiary island arc of Macuchi, and porphyry-Cu and precious-metal epithermal deposits in association with the middle-late Tertiary continental-arc magmatism on the newly assembled crust of Ecuador (Macuchi, Chaucha, Tahuin, Loja, and Alao terranes). In this study, we have compiled 148 new and 125 previously published lead isotope analyses on Paleozoic to Miocene metamorphic, intrusive, volcanic, and volcanosedimentary rocks, as well as on Jurassic to Miocene magmatic-related ore deposits of Ecuador. Lead isotope compositions of the magmatic rocks of the four main arc events derive from mixing of various sources including mantle, variably enriched by pelagic sediments and/or by a high 238U/204Pb component, and heterogeneous continental crust rocks. Lead isotope compositions of the Ecuadorian ore deposits display a broad range of values (206Pb/204Pb = 18.3–19.3, 207Pb/204Pb = 15.54–15.74, 208Pb/204Pb = 38.2–39.2), which is as large as the range previously reported for all magmatic-related ore deposits of the Central Andean provinces I and II combined. Ore deposits formed before complete assembly of the Ecuadorian crust through complete accretion of the several terranes (i.e., pre-Eocene) have lead isotope compositions overlapping those of the associated magmatic rocks, suggesting a largely magmatic origin for their lead. In contrast, post-assembly ore deposits (i.e., post-Eocene) have lead isotope compositions that only partly overlap those of the coeval magmatic rocks of the continental arc. In fact, several ore deposits have lead isotope compositions shifted toward those of the basement rocks that host them, suggesting that lead derives from a mixture of magmatic lead and basement-rock lead leached by hydrothermal fluids. Most Ecuadorian ores have high 207Pb/204Pb values (>15.55), suggesting a dominant continental crust or pelagic sediment origin of the lead. However, we caution against concluding that chalcophile metals (for example, Cu and Au) also have a continental crust origin. Ore deposits of the different terranes of Ecuador, irrespective of their age, plot in distinct isotopic fields, which are internally homogeneous. This suggests that lithologic factors had an important control on the lead isotope compositions. Ultimately, lead isotope compositions of the ore deposits of Ecuador mirror the isotopic compositions of the rocks of the host terranes and are consistent with the multiterrane nature of the Ecuadorian crust.
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Zhmurova, Viktoria. "Hydrochemical cleaning of gold-containing cathode deposits from heavy non-ferrous metal impurities." Proceedings of Irkutsk State Technical University 24, no. 5 (October 2020): 1126–36. http://dx.doi.org/10.21285/1814-3520-2020-5-1126-1136.

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The purpose of this paper is to conduct the research on hydrochloric acid cleaning of gold-containing cathode deposits from the impurities of heavy non-ferrous metals and mathematical processing of the experimental data obtained by the method of dispersion analysis. The atomic absorption method is used to study the chemical composition of the cathode deposits. The method of dispersion analysis is used to process experimental data. The composition of cathode deposit impurities is studied using x-ray spectral microanalysis. The study of the chemical composition of cathode deposits has shown that their main components are gold, silver, copper, lead, as well as non-metallic impurity compounds (CaO, SiO2, etc.). It is found that the optimal concentration of hydrochloric acid for cleaning gold-containing cathode deposits from heavy non-ferrous metals is 371 kg/m3; the degree of copper transition to solution is 69.06%, lead - 93.9%. The calculation of the expected mass fraction of precious metals in the alloyed gold demonstrates an increase in the mass fraction of gold by 14.08%, silver - by 17.46%. The study of the chemical composition of cathode deposits has also revealed that the main impurities that affect their subsequent processing are copper and lead. The latter fall into the ingot of alloyed gold, which is the target product of gold-bearing ore processing and complicate subsequent refining. The dispersion analysis of experimental data shows that solvent concentration significantly affects the transition degree of heavy non-ferrous metals to the solution starting from the value of 20.1 kg/m3. It is shown that the proposed method allows to increase the content of precious metals in the alloyed gold by 31.54%, as well as to perform maximum transition of copper and lead to the solution. The use of acid leaching of impurities from cathode deposits obtained by cyanide-sorption technology is one of the promising directions for improving the quality of gold-containing alloys and hence the reduction of the cost of refining services.
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40

Xu, Shan, Yun Feng Liu, Yong Qiang Yang, and Shou Yi Li. "The Characters of Bairendaba - Huanggangliang Deposits, Inner Mongolia, China." Advanced Materials Research 881-883 (January 2014): 1616–20. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1616.

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The paper systematically analyzed the relationships between geological conditions including strata and magmatic rock, etc and lead-zinc deposits, and found out their control action and features on Pb-Zn and Fe-Sn deposits, then established the comprehensive prospecting model for Pb-Zn and Fe-Sn deposits that consisted of geological, geochemical and mineralization information, which will provide theoretical basis for predicting the lead-zinc metallogenic deposits within this metallegenic belt.
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41

Vaughan, J. P. "The iron end-member of the pyrosmalite series from the Pegmont lead-zinc deposit, Queensland." Mineralogical Magazine 50, no. 357 (September 1986): 527–31. http://dx.doi.org/10.1180/minmag.1986.050.357.17.

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AbstractPyrosmalite [(Mn,Fe)8(OH,Cl)10Si6O15] has been identified by X-ray diffraction from the Pegmont lead-zinc deposit, north-west Queensland. Microprobe analyses indicate that it is the first reported occurrence of an extremely iron-rich member of the series. The characteristically high chlorine content of pyrosmalite in Pegmont and other similar base metal deposits may provide some evidence concerning the depositional environment of these stratiform Pb-Zn ores.
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42

Yunacti, Muslum, Alexandre Mégret, Mariana Henriette Staia, Alex Montagne, and Véronique Vitry. "Characterization of Electroless Nickel–Boron Deposit from Optimized Stabilizer-Free Bath." Coatings 11, no. 5 (May 15, 2021): 576. http://dx.doi.org/10.3390/coatings11050576.

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Conventional electroless nickel–boron deposits are produced using solutions that contain lead or thallium, which must be eliminated due to their toxicity. In this research, electroless nickel–boron deposits were produced in a stabilizer-free bath that does not include any toxic heavy metal. During processing, the plating rate increased from 10 to 14.5 µm/h by decreasing the concentration of the reducing agent, leading to increased bath stability. The thickness, composition, roughness, morphology, hardness, wear, and corrosion resistance of the deposits were characterized. The new deposit presents an excellent hardness of 933 ± 56 hv50, 866 ± 30 hk50, and 12 GPa from the instrumented indentation test (IIT), respectively, which are similar to that of hexavalent hard chromium coating. Moreover, by using both potentiodynamic polarization and salt spray tests it was shown that the coating presents higher corrosion resistance as compared to standard nickel-boron coatings. The new deposit exhibits properties close to those of the conventional electroless nickel–boron deposits. Therefore, it could replace them in any industrial applications.
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43

Luong, Khang Quang, Hung The Khuong, Tuong Van Nguyen, and Thu Thi Le. "Study on establishing a mining group of deposit and an exploration grid pattern for lead - zinc ore in Ban Lim area, Cao Bang province." Journal of Mining and Earth Sciences 61, no. 3 (June 30, 2020): 38–50. http://dx.doi.org/10.46326/jmes.2020.61(3).05.

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Ban Lim area in Cao Bang province has proposed a high potential of lead-zinc resources, which have occurred in different rocks of geological formation. The paper-based on collecting, synthesizing, and geological processing data. In addition, mathematical methods were also applied to recognize studied objects of the exploration process using a quantitative description. The results how that the lead-zinc orebodies in Ban Lim area mainly occurred in lens-shaped and distributed in layered surfaces of the dolomitized limestone of Coc Xo formation. The average lead-zinc content of the orebodies is in a range from 3.27% to 8.33%; its coefficient of variation (Vc) is in a range from 13.71% (evenly) to 137.92% (very unevenly). Generally, the lead-zinc contents of the orebodies in Ban Lim area mainly comply with the standard normal distribution. The average thicknesses of the orebodies are in a range from 0.92 m to 6.48 m, its coefficient of variation (Vm) is in the range from 8.7% (stable) to 132.95% (very unstable). Quantitative calculation results have shown that Ban Lim lead-zinc deposit belongs to group III of deposits. For the exploration of this type of minerals, it is recommended to use a linear grid pattern. Appropriate exploration grid pattern for the 122 category reserve is (60÷80) m × (30÷40) m. These calculated results are well- documented foundations that allow suggesting a mining group of deposit and an exploration grid pattern for lead-zinc ore in Ban Lim area and other lead-zinc deposits occurring in similar geological settings.
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44

Gzyl, Jarosław, Roman Przymusiński, and Adam Woźny. "Organospecific reactions of yellow lupin seedlings to lead." Acta Societatis Botanicorum Poloniae 66, no. 1 (2014): 61–66. http://dx.doi.org/10.5586/asbp.1997.009.

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Changes caused by lead, supplied in the form of Pb(NO3)2, in roots and hypocotyls of 4 day old yellow lupin (<em>Lupinus luteus</em> L. cv. <em>ventus</em>) seedlings have been analyzed using a transmission electron microscope and polyacrylamide gel electrophoresis (PAGE). The cells of all examined parts of the roots growing in the presence of Pb<sup>2+</sup> contained many lead deposits (mainly in the cell walls and vacuoles) and the increased amount of polypeptides of molecular weight close to 16 kDa have been observed. Similar changes were detected in the area of hypocotyl adjoining the root. However, in upper regions of the hypocotyl only a slight amount of lead deposits was visible and the 16 kDa polypeptide content was comparable to the control cells. The obtained results indicate a relationship between the presence of lead deposits in cells and accumulation of polypeptides of - 16 kDa. The results seem also to indicate that in the analyzed parts of the seedlings, both the amount of accumulated polypeptides of MW - 16 kDa and the amount of lead decreased from root tip to hypocotyl.
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45

Cheng, Yong Sheng. "Lead Isotope of Sulfide Minerals from Dachang Ore Field of Guangxi (South China): Characteristic and Implication." Advanced Materials Research 455-456 (January 2012): 1399–403. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1399.

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In the Danchi mineralization belt of Guangxi province, south China, the Dachang tin-polymetallic ore deposit is one of the largest Sn ore deposits in this world. But about the genesis and the ore source, there have been some disputes. In terms of the Dafulou deposit, the mineralization model and deposit mechanism is rather illegibility. By analysing and comparing the lead isotope of three ore deposit (the Changpo, the Lamo and the Dafulou), it show that the correlations of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb of sulfide minerals demonstrate obvious excellent linear relation. So, it is also suggested that the eastern mineralization belt, the middle mineralization belt and the western mineralization belt shared the same ore source. And, according to the features of no.22 ore body, the Dafulou deposit is characterized with the characteristics of the Sedimentary Exhalative Deposit (SEDEX).
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46

Gigon, Joséphine, Etienne Deloule, Julien Mercadier, David L. Huston, Antonin Richard, Irvine R. Annesley, Andrew S. Wygralak, Roger G. Skirrow, Terrence P. Mernagh, and Kristian Masterman. "Tracing metal sources for the giant McArthur River Zn-Pb deposit (Australia) using lead isotopes." Geology 48, no. 5 (February 27, 2020): 478–82. http://dx.doi.org/10.1130/g47001.1.

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Abstract Giant hydrothermal ore deposits form where fluids carrying massive amounts of metals scavenged from source rocks or magmas encounter conditions favorable for their localized deposition. However, in most cases, the ultimate origin of metals remains highly disputed. Here, we show for the first time that two metal sources have provided, in comparable amounts, the 8 Mt of lead of the giant McArthur River zinc-lead deposit (McArthur Basin, Northern Territory, Australia). By using high-resolution secondary ion mass spectrometry (SIMS) analysis of lead isotopes in galena, we demonstrate that the two metal sources were repeatedly involved in the metal deposition in the different ore lenses ca. 1640 Ma. Modeling of lead isotope fractionation between mantle and crustal reservoirs implicates felsic rocks of the crystalline basement and the derived sedimentary rocks in the basin as the main lead sources that were leached by the ore-forming fluids. This sheds light on the crucial importance of metal tracing as a prerequisite to constrain large-scale ore-forming systems, and calls for a paradigm shift in the way hydrothermal systems form giant ore deposits: leaching of metals from several sources may be key in accounting for their huge metal tonnage.
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47

Höy, T., and C. I. Godwin. "Significance of a Cambrian date from galena lead-isotope data for the stratiform Cottonbelt deposit in the Monashee Complex, southeastern British Columbia." Canadian Journal of Earth Sciences 25, no. 9 (September 1, 1988): 1534–41. http://dx.doi.org/10.1139/e88-145.

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The Cottonbelt deposit is a large stratiform lead–zinc–magnetite layer within cover rocks of Frenchman Cap dome in the Monashee Complex in southeastern British Columbia. Lead-isotope analyses of galena samples from the deposit plot close to the Cambrian–Hadrynian boundary on lead-isotope ratio diagrams and are similar to analyses of Early Cambrian stratiform deposits in the Anvil Camp in the Yukon Territory. These data suggest that the Cottonbelt deposit and host succession are Cambrian in age, in contrast to other interpretations that suggest considerably older ages for the cover succession of Frenchman Cap dome. These cover rocks, therefore, are considered calcareous and pelitic facies of lower Paleozoic shelf rocks now exposed in the Kootenay Arc to the southeast and the Selkirk Mountains to the east.
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48

Wierzbicka, Małgorzata. "Lead translocation and localization in Allium cepa roots." Canadian Journal of Botany 65, no. 9 (September 1, 1987): 1851–60. http://dx.doi.org/10.1139/b87-254.

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Based on autoradiographic (210Pb) and ultrastructural studies, it was determined that lead is taken up from solution with the same intensity along the length of Allium cepa L. roots. As expected, the rate of uptake is dependent on the lead concentration and exposure time of the roots to lead salts. Lead takes about 80 min to penetrate radially through consecutive root tip layers in the meristematic zone. Lead is first deposited on the root surface, and then is translocated radially through the middle lamella (apoplast) of root cap cells. The lead reaches protoderm cells and meristematic cells of the hypodermis, where it penetrates into the symplast. Lead passes through consecutive ground meristem tissue layers at the rate of 1 cell layer/5 min. Its deposition in the ground meristem tissue is surprisingly nonuniform. It is deposited uniformly in the first six layers, but in the deeper (7th to 10th) layers, lead deposits are encountered in intercellular spaces and the middle lamellae, then in the cell walls near the plasmalemma, and finally in vacuoles.
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49

Wu, Tong, Ruidong Yang, Junbo Gao, and Jun Li. "Age of the lower Cambrian Vanadium deposit, East Guizhou, South China: Evidences from age of tuff and carbon isotope analysis along the Bagong section." Open Geosciences 13, no. 1 (January 1, 2021): 999–1012. http://dx.doi.org/10.1515/geo-2020-0287.

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Abstract The early Cambrian is a critical interval of dramatic oceanic and biochemical changes in geological history. The black shale deposits, which are rich in Mo, Ni, V, and platinum group elements (PGE), are a reflection of that interval. Among all known Cambrian black shale deposits in South China, the vanadium deposits are poorly constrained by geochronology. The newly discovered tuff layer in the Sansui Bagong vanadium deposit in Guizhou Province can provide excellent constraints on the age of vanadium deposits. In this study, we obtain a new zircon U–Pb isotopic age, which can constrain the age of the vanadium deposit. This tuff occurs in the middle part of the ore bed, and the age of the tuff layer can reflect the mineralization age of the V deposit. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is used in this study to obtain the zircon U–Pb age of the tuff and indicates that the event of volcanic activity took place at 520.9 ± 1 Ma. This age is close to the boundary between the Cambrian Terreneuvian and Series 2. This result provides a good constraint on the age of the vanadium deposits in South China and makes the vanadium deposits to be comparable with other Mo–Ni–PGE deposits. The alteration of organic carbon isotope (δ 13Corg) values can reflect changes in the marine environment and is widely used in stratigraphic correlation. The analysis of the δ 13Corg values of the ore bed in the present study reveals a positive excursion at the bottom of the deposit and a negative excursion in the V-enriched layer. The δ 13Corg values in the Bagong section are comparable to those in the Xiaotan and Longbizui sections. The ages of the Sansui vanadium deposit constrained by the U–Pb isotopic age of the tuff and the δ 13Corg values are consistent. All of the data lead us to infer that the vanadium deposit formed at approximately 521 Ma.
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Borisov, Michael, Dmitry Bychkov, Mariya Volkova, and Yury Shvarov. "Role of water/rock interaction in the formation of ore-bearing solutions and deposition of hydrothermal ore, Sadon Mining District, North Caucasus Mountains, Russia." E3S Web of Conferences 98 (2019): 05003. http://dx.doi.org/10.1051/e3sconf/20199805003.

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REE distribution patterns of the ores and host rocks of the Dzhimidon vein lead-zinc deposit (North Caucasus, Ossetia, Sadon mining district, Russia) have been analyzed to elucidate the source(s) of hydrothermal ore deposits. Two types of prevailing rocks are involved in ore formation - Paleozoic granites (the main ore-hosting rocks at the majority of deposits) and Precambrian schists (specific only the for host rocks of the Dzhimidon deposit). The source of ore components tends to be complex and includes host rocks in variable proportions that could be characterized by REE distribution in ores. Interaction of water with combined sources was thermodynamically modeled. Critical differences were found in the ore-forming models, with variable sequence and rock proportions during interaction with barren fluid.
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