吉林省辽源市弯月金矿成矿地质特征及矿床成因

弯月金矿床是我队在吉林省东部地区发现有金矿化集中区之一,通过地表工程的深部稀疏钻孔控制,目前为一小型金矿床,普查结果表明,矿化系统有一定延深。本文对金矿床地质特征及矿床成因分析,认为构造、岩浆活动在成矿过程中起着重要作用,对吉林省东部金矿找矿有着指导作用,明确了本区深部找矿方向。     

夹皮沟地区金矿地球化学找矿评价指标及深部预测

自一九七八年以来,我们在夹皮沟地区开展了金矿地球化学找矿及评价指标的研究工作,一九八三年利用前几年的研究成果用地球化学方法对三道岔金矿床的深部进行了预测,为该区找矿,勘探提供了新的依据。 一、夹皮沟地区的地质概况 夹皮沟金矿位于吉林省桦甸县东部,该矿具有160多年的开采史,是吉林省的主要产金区,也是我国著名金矿山之一。     

吉林磐石市粗榆金矿床地质特征及找矿方向

粗榆金矿床是吉林省中部地区少有的金矿化集中区之一,累计探明金储量2750kg,本次深部勘查结果表明,矿化系统延深大于延长。对金矿床地质特征及矿床成因分析,认为构造、岩浆活动在成矿过程中起着重要作用,对吉林省中部金矿找矿有着指导作用,明确了本区深部找矿方向。     

吉林省东部槽区两项金矿科研成果评审会的报导

吉林省地质科学研究所于1983年9月下旬在长春召开了金矿科研成果评审会,应邀参加会议的有省局及其所属单位的科技工作者32人。会议期间对“吉林省槽区北部下古生界金矿地质特征及其分布规律”和“吉林省槽区东部金矿床地质特征及矿石物质成分和有益元素赋存状态”两项科研成果进行了审议。与会同志一致认为:这两项科研成果都较好地完成了设计要求,已达到了省内的较高水平。“吉林省槽区北部下古生界金矿地质特征及其分布规律”的科研成果,是以板块构造理论列下古生界金矿地质特征及其分布规律进行了全面而系统的综合研究。用复合成矿和成矿系列的观点,对下古生界有关的金矿及其它矿产的成因类型进行了综合分析,总结了下古生界不同类型岩石中微量金的地球化学特征,探讨了成矿作用与地层、变质作用、岩浆活动及板块构造之间的成因联系,从而建立     

延边北部与金矿床有关的侵入杂岩和火山岩特征

吉林省延边地区北部有大、中型原生金(铜)矿床和砂金矿床计五处,小型原生金矿床和砂金矿床十多处。本区探明的金矿储量约占全省金矿总储量的35％。综合研究认为:该区金矿与区内华力西晚期侵入杂岩和燕山期火山岩(包括次火山岩)在空间上与成因上存在密切联系。因此,研究本区侵入杂岩和火山岩特征,并探讨其与金矿床成矿的专属性,对指导本区寻找金矿床有着重要的现实意义。     

广西东部石英脉型金矿的成矿特征

广西东部的金矿分布地区,大致呈东西向带状延伸。金矿以石英脉型为主,只有个别硫化物型矿床和沿江分布的冲积型砂金矿床。某些规模较大的含金石英脉,风化剥蚀后,形成了残坡积型砂金矿床。     

《吉林省珲春市黄松甸子第三系砾岩型金矿床技术经济评价及工业指标研究》通过评审鉴定

吉林省地质矿产局受吉林省科学技术委员会委托,于1992年6月23日聘请长春地质学院、吉林省储量委员会和吉林省地矿局等有关专家,在长春主持对吉林省地员科学研究所完成的《吉林省珲春市黄松甸子第三系砾岩型金矿床技术经济评价及工业指标研究》课题进行评审鉴定。该成果从矿床地质特征入手,以矿山建设为中心,采用各种先进手段和地质技术经济学理论,开创性地研究了吉林省珲春市第三系砾岩型金矿床的工业指标,并对这种新类型金矿作了技术经济评价。评委认为该报告探索了砾岩型矿床技术经济评价和工业指标的确定,对这类金矿床的技术经济评价具有指导、引     

桦甸市张家屯矿区石英脉型含金矿床地质特征简述

张家屯金矿床是吉林省有色金属地质勘查局六○六队受吉林省桦甸市鑫利隆矿业有限公司的委托,对桦甸市大楼矿区张家区段石英脉型含金银铅锌矿床进行详查评价工作,通过地表工程及旧坑道调查,目前确定为一小型金矿床。工作结果表明,矿化系统有一定延深。本文对金矿床地质特征及矿床成因分析,认为构造、岩浆活动在成矿过程中起着重要作用,对吉林省该区金矿找矿有着指导作用,明确了本区找矿方向。     

一个伴生多种元素的大型金矿的发现

在吉林省东部山区,六十年代发现了一个含有多种元素的大型原生金矿床.虽然时间过去了十多年,但在露头矿日益减少,找矿难度不断加大,人们面临着寻找盲矿的艰巨任务的今天,回顾一下这个矿床的发现过程,对于今后开展综合找矿勘探,或许是会有某些启示的. 金矿的发现六十年代初,根据国家对黄金的需要,许多地质队都集中了相当一部分力量,投入了黄金的普查找矿工作.吉林省地质局的一个金矿专业队,就在这个时候进入了工作地区. 他们首先分析了工作区的重砂分布图,发现工作区     

中国金矿床类型、时空分布规律及找矿方向概述

本文从宏观上对中国的金矿床类型和时空分布规律进行了总结,指出了找矿方向。立足于中国金矿成矿地球动力学环境,以矿床基本地质特征为依据,对中国的金矿床进行了类型划分,阐述了8类独立岩金矿床地质特征。基于构造单元和地质演化历史对金矿床区域分布的制约,将中国金矿划分为5大成矿域、37个成矿集中产出区带,并总结了各区带的大地构造环境和相对应的金矿床类型。将矿床作为地质演化的历史指针来研究,把中国金矿床矿化时期划分为7个集中时期,并阐述了各成时期金矿化强度、主要金矿床类型及其空间分布规律。综合不同方法定量预测成果,认为中国未查明金矿资源潜力巨大,东部深部和西部还有很大找矿空间。简要评述了各个成矿区带找矿潜力,指出了下一步金矿找矿方向。     

Isotopic systematics of He,Ar, S,Cu, Ni,Re, Os,Pb, U,Sm, Nd,Rb, Sr,Lu, and Hf in the rocks and ores of the Norilsk deposits

This paper reports the first results of a study of 11 isotope systems (³He/⁴He, ⁴⁰Ar/³⁶Ar, ³⁴S/³²S, ⁶⁵Cu/⁶³Cu, ⁶²Ni/⁶⁰Ni, ⁸⁷Sr/⁸⁶Sr, ¹⁴³Nd/¹⁴⁴Nd, ^206–208Pb/²⁰⁴Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others.     

高压微波消解法测定醋酸纤维过滤器采集的微尘粒子中的砷镉钴铬铜铁锰镍铅钒锌

最新的流行病学研究表明,空气中较高浓度的悬浮细颗粒可能对人类的健康有不利的影响。根据该项研究显示,由于心脏病、慢性呼吸问题和肺功能指标恶化而导致死亡率的升高与细尘粒子有关。这些研究结果已经促使欧盟于1999年4月出台了限制空气中二氧化硫、二氧化氮、氧化氮、铅和颗粒物含量的法案(1999/30/EC),对各项指标包括对可吸入PM10颗粒的浓度提出了新的限制性指标。PM10颗粒是指可以通过预分级器分离采集的气体动力学直径小于10μm的细颗粒。目前研究的兴趣重点逐步偏向PM2.5这些更细微颗粒物,PM2.5这种颗粒物对健康有明显的不利影响。在欧盟指令2008/50/EC中,对PM10和PM2.5都提     

Wavelength-dispersive X-ray fluorescence spectrometric determination of Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites

Komatiites are mantle-derived ultramafic volcanic rocks. Komatiites have been discovered in several States of India, notably in Karnataka. Studies on the distribution of trace-elements in the komatiites of India are very few. This paper proposes a simple, accurate, precise, rapid, and non-destructive wavelength-dispersive x-ray fluorescence (WDXRF) spectrometric technique for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites, and discusses the accuracy, precision, limits of detection, x-ray spectral-line interferences, inter-element effects, speed, advantages, and limitations of the technique. The accuracy of the technique is excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Zr, Nb, Ba, Pb, and Th and very good (within 4%) for Y. The precision is also excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th. The limits of detection are: 1 ppm for Sc and V; 2 ppm for Cr, Co, and Ni; 3 ppm for Cu, Zn, Rb, and Sr; 4 ppm for Y and Zr; 6 ppm for Nb; 10 ppm for Ba; 13 ppm for Pb; and 14 ppm for Th. The time taken for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in a batch of 24 samples of komatiites, for a replication of four analyses per sample, by one operator, using a manual WDXRF spectrometer, is only 60 hours.     

Regional distribution of Al,B, Ba,Ca, K,La, Mg,Mn, Na,P, Rb,Si, Sr,Th, U and Y in terrestrial moss within a 188,000 km2 area of the central Barents region: influence of geology,seaspray and human activity

Five hundred and ninety-eight samples of terrestrial moss (Hylocomium splendens and Pleurozium schreberi) collected from a 188,000 km² area of the central Barents region (NE Norway, N Finland, NW Russia) were analysed by ICP-AES and ICP-MS. Analytical results for Al, B, Ba, Ca, K, La, Mg, Mn, Na, P, Rb, Si, Sr, Th, U and Y concentrations are reported here. Graphical methods of data analysis, such as geochemical maps, cumulative frequency diagrams, boxplots and scatterplots, are used to interpret the origin of the patterns for these elements. None of the elements reported here are emitted in significant amounts from the smelting industry on the Kola Peninsula. Despite the conventional view that moss chemistry reflects atmospheric element input, the nature of the underlying mineral substrate (regolith or bedrock) is found to have a considerable influence on moss composition for several elements. This influence of the chemistry of the mineral substrate can take place in a variety of ways. (1) It can be completely natural, reflecting the ability of higher plants to take up elements from deep soil horizons and shed them with litterfall onto the surface. (2) It can result from naturally increased soil dust input where vegetation is scarce due to harsh climatic conditions for instance. Alternatively, substrate influence can be enhanced by human activity, such as open-cast mining, creation of ‘technogenic deserts’, or handling, transport and storage of ore and ore products, all of which magnify the natural elemental flux from bedrock to ground vegetation. Seaspray is another natural process affecting moss composition in the area (Mg, Na), and this is most visible in the Norwegian part of the study area. Presence or absence of some plant species, e.g., lichens, seems to influence moss chemistry. This is shown by the low concentrations of B or K in moss on the Finnish and Norwegian side of the (fenced) border with Russia, contrasting with high concentrations on the other side (intensive reindeer husbandry west of the border has selectively depleted the lichen population).     

Petrographic, mineralogy, and geochemistry of coals of Pabedana, Kerman Province, Central Iran

This paper discusses the result of the detailed investigations carried out on the coal characteristics, including coal petrography and its geochemistry of the Pabedana region. A total of 16 samples were collected from four coal seams d2, d4, d5, and d6 of the Pabedana underground mine which is located in the central part of the Central-East Iranian Microcontinent. These samples were reduced to four samples through composite sampling of each seam and were analyzed for their petrographic, mineralogical, and geochemical compositions. Proximate analysis data of the Pabedana coals indicate no major variations in the moisture, ash, volatile matter, and fixed carbon contents in the coals of different seams. Based on sulfur content, the Pabedana coals may be classified as low-sulfur coals. The low-sulfur contents in the Pabedana coal and relatively low proportion of pyritic sulfur suggest a possible fresh water environment during the deposition of the peat of the Pabedana coal. X-ray diffraction and petrographic analyses indicate the presence of pyrite in coal samples. The Pabedana coals have been classified as a high volatile, bituminous coal in accordance with the vitrinite reflectance values (58.75–74.32 %) and other rank parameters (carbon, calorific value, and volatile matter content). The maceral analysis and reflectance study suggest that the coals in all the four seams are of good quality with low maceral matter association. Mineralogical investigations indicate that the inorganic fraction in the Pabedana coal samples is dominated by carbonates; thus, constituting the major inorganic fraction of the coal samples. Illite, kaolinite, muscovite, quartz, feldspar, apatite, and hematite occur as minor or trace phases. The variation in major elements content is relatively narrow between different coal seams. Elements Sc,, Zr, Ga, Ge, La, As, W, Ce, Sb, Nb, Th, Pb, Se, Tl, Bi, Hg, Re, Li, Zn, Mo, and Ba show varying negative correlation with ash yield. These elements possibly have an organic affinity and may be present as primary biological concentrations either with tissues in living condition and/or through sorption and formation of organometallic compounds.     

Mercury,arsenic, antimony,and selenium contents of sediment from the Kuskokwim River,Bethel, Alaska,USA

The Kuskokwim River at Bethel, Alaska, drains a major mercury-antimony metallogenic province in its upper reaches and tributaries. Bethel (population 4000) is situated on the Kuskokwim floodplain and also draws its water supply from wells located in river-deposited sediment. A boring through overbank and floodplain sediment has provided material to establish a baseline datum for sediment-hosted heavy metals. Mercury (total), arsenic, antimony, and selenium contents were determined; aluminum was also determined and used as normalizing factor. The contents of the heavy metals were relatively constant with depth and do not reflect any potential enrichment from upstream contaminant sources.     

Coprecipitation of Ti,Mo, Sn and Sb with fluorides and application to determination of B,Ti, Zr,Nb, Mo,Sn, Sb,Hf and Ta by ICP-MS

We examined the coprecipitation behavior of Ti, Mo, Sn and Sb in Ca–Al–Mg fluorides under two different fluoride forming conditions: at < 70 °C in an ultrasonic bath (denoted as the ultrasonic method) and at 245 °C using a Teflon bomb (denoted as the bomb method). In the ultrasonic method, small amounts of Ti, Mo and Sn coprecipitation were observed with 100% Ca and 100% Mg fluorides. No coprecipitation of Ti, Mo, Sn and Sb in Ca–Al–Mg fluorides occurred when the sample was decomposed by the bomb method except for 100% Ca fluoride. Based on our coprecipitation observations, we have developed a simultaneous determination method for B, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta by Q-pole type ICP-MS (ICP-QMS) and sector field type ICP-MS (ICP-SFMS). 9–50 mg of samples with Zr–Mo–Sn–Sb–Hf spikes were decomposed by HF using the bomb method and the ultrasonic method with B spike. The sample was then evaporated and re-dissolved into 0.5 mol l^− 1 HF, followed by the removal of fluorides by centrifuging. B, Zr, Mo, Sn, Sb and Hf were measured by ID method. Nb and Ta were measured by the ID-internal standardization method, based on Nb/Mo and Ta/Mo ratios using ICP-QMS, for which pseudo-FI was developed and applied. When 100% recovery yields of Zr and Hf are expected, Nb/Zr and Ta/Hf ratios may also be used. Ti was determined by the ID-internal standardization method, based on the Ti/Nb ratio from ICP-SFMS. Only 0.053 ml sample solution was required for measurement of all 9 elements. Dilution factors of ≤ 340 were aspirated without matrix effects. To demonstrate the applicability of our method, 4 carbonaceous chondrites (Ivuna, Orgueil, Cold Bokkeveld and Allende) as well as GSJ and USGS silicate reference materials of basalts, andesites and peridotites were analyzed. Our analytical results are consistent with previous studies, and the mean reproducibility of each element is 1.0–4.6% for basalts and andesites, and 6.7–11% for peridotites except for TiO₂.