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1.
Wu Daqing 《中国地球化学学报》1987,6(3):216-224
Phase relations in the ternary systems Ag2S-Cu2S-PbS and Ag2S-Cu2S-Bi2S3 were studied using the silica vacuum technique.
In the system Ag2S-Cu2S-Bi2S3 the phase relations are dominated by join-lines from galena to f.c.c. (Agx Cu2−xS) and b.c.c. (Cux Ag2−xS) at 500°C. With decreasing temperature, galena can coexist with all the phases on the Ag2S-Cu2S join.
There are six solid solutions, and one new phase, i.e., “C” whose composition is Ag1.1 Cu4.8Bi5.8S12 in the system Ag2S-Cu2S-Bi2S3 at 500°C. The pavonite (AgBi3S5) contains 14 mole% Cu2S in solid solution, but only 3.0 mole% Ag2S in CuBi3S5 solid solution. The Cu3Bi5S9 ss and wittichenite (Cu3BiS3) ss can form join-lines with pavonite as and have the maximum contents of 9.0 and 18 mole% Ag2S. The most striking feature is the presence of bejaminite as a stable phase with a chemical formula of Ag2Bi4S7 on the Ag2S-Bi2S3 join. AgBiS2 of the PbS type occupies a fairly large field with a maximum of 23 mole% Cu2S. 相似文献
2.
Panagiotis Christos Voudouris Paul G. Spry Gregory Aarne Sakellaris Constantinos Mavrogonatos 《Mineralogy and Petrology》2011,101(3-4):169-183
A cervelleite-like mineral, two unnamed silver sulfotellurides in the system Ag-Cu-Te-S [Ag2CuTeS, (Ag,Cu)2TeS], Te-rich polybasite and cadmian tetrahedrite occur in gold-bearing quartz veins in metapelites and faults within brecciated marbles of the Cycladic Blueschist Unit in the Kallianou area (southern Evia Island, Greece). The quartz veins and faults are discordant to syn-metamorphic structures and formed during ductile to brittle deformation in the final stages of exhumation of the Styra Nappe extrusion wedge (~21?Ma). Te-rich polybasite (up to 7.4 wt. % Te), cadmian tetrahedrite (up to 12.4 wt. % Cd), together with electrum (23?C54 wt. % Ag) and the sulfotellurides, are the main silver carriers in the mineralization. The two unnamed sulfotellurides, Ag2CuTeS and (Ag,Cu)2TeS are believed to be new quaternary minerals in the system Ag-Cu-Te-S. These minerals and the cervelleite-like phase could have exsolved from galena during cooling (below 200°C). Initial temperatures for the formation of the sulfotellurides, in the form of hessite-intermediate solid solution, at Kallianou may be up to 300°C under logfS2 values between?~ ?11.5 to ?8.3, and logfTe2 from?~ ?14.8 to ?7.8. The values of logfTe2 and logfS2 during re-equilibration (at ~200°C) were constrained to ?19.5 to ?15.2 and to ?15.8 to ?11.5 respectively. 相似文献
3.
Chemical composition and mode of occurrences of (Au, Ag)Te2 minerals such as calaverite (AuTe2), sylvanite (AuAgTe4) and krennerite ((Au, Ag)Te2) in epithermal gold telluride ores from Suzaki, Kawazu and Teine are examined. In the ores from Suzaki, (Au, Ag)Te2 minerals occur in microbands of tellurides and fine quartz. The minerals in telluride bands change from krennerite, via calaverite‐native tellurium, to sylvanite, in the order of crystallization. A sample from Kawazu contains sylvanite and native tellurium with stutzite, hessite and tetradymite in the coarser gray quartz part. The Teine sample also contains sylvanite and native tellurium with barite and quartz. The peak patterns of XRD of calaverite, krennerite and sylvanite from Suzaki are almost identical to that of JCPDS 43–1472, JCPDS 8–20 and JCPDS 9–477, respectively. The Te, Au, Cu, and Ag contents of calaverite from Suzaki range from 56.4 to 57.9 wt.%, from 41.6 to 42.6 wt.%, from 0.28 to 0.45 wt.% and from 0.14 to 0.31 wt.%, respectively, corresponding to the formula Au0.97Ag0.01Cu0.02Te2. The Te, Au, Ag, and Cu contents of krennerite from Suzaki range from 59.6 to 61.4 wt.%, from 31.3 to 33.6 wt.%, from 4.91 to 6.13 wt.% and from 0.66 to 0.80 wt.%, respectively, corresponding to the formula Au0.71Ag0.22Cu0.05Te2 with Au and Ag ranging from 0.68 to 0.74 and from 0.20 to 0.25, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Suzaki range from 61.5 to 63.4 wt.%, from 24.1 to 27.4 wt.%, from 10.0 to 12.5 wt.% and from 0.00 to 0.12 wt.%, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Kawazu range from 62.7 to 63.3 wt.%, from 23.5 to 24.1 wt.%, from 12.0 to 12.5 wt.% and from 0.09 to 0.16 wt.%, respectively. The Te, Au, Ag, Cu and Fe contents of sylvanite from Teine range from 61.8 to 63.5 wt.%, from 23.6 to 24.7 wt.%, from 11.9 to 13.3 wt.%, from 0.01 to 1.65 wt.% and from 0.00 to 0.02 wt.%, respectively. The average formulae of sylvanite from Suzaki, Kawazu, and Teine are expressed as Au1.06Ag0.94Cu0.02Te4, Au1.00Ag0.95Cu0.02Te4 and Au1.01Ag0.95Cu0.06Te4, respectively. Judging from the mineral assemblages of these ores and other localities, Au–Te mineralization in the Japanese Islands can be divided into four types: native gold–calaverite at Date and Agawa, krennerite(?native tellurium) at Osore‐zan and Mutsu, sylvanite–native tellurium–hessite at Teine, Kawazu, Kobetsuzawa, and Kato, and polyminerallic assemblages at Suzaki and Kushikino. The pH–Eh diagram of aqueous tellurium species and tellurium minerals at 250°C indicates that (Au, Ag)Te2 minerals in epithermal gold telluride mineralization would have been formed under middle to low Eh and acidic (to intermediate) pH conditions. It is possible that dilute tellurium‐containing fluid would scavenge dilute gold. 相似文献
4.
样品经硝酸、氢氟酸、高氯酸分解，制成硝酸溶液，经巯基棉层析柱过滤富集Ag，并用2mol／LHBr溶液洗脱，用火焰原子吸收法测定洗脱液中的Ag和滤液中的Cu，Pb，Zn。用该法测定化探样品中银和铜铅锌，检出限低，结果准确度和精密度均令人满意。 相似文献
5.
双尖子山Pb- Zn- Ag矿床位于黄岗- 甘珠尔庙多金属成矿带的东北段,是目前发现的中国最大的银矿床。本文通过野外地质调查、矿相学鉴定、电子探针背散射图像以及电子探针化学成分分析,对该矿床金属矿物的矿物学特征进行了详细研究,同时对金属矿物的化学式进行了计算,并对银的富集机理进行了探讨。银矿物主要以可见银(>50μm)的形式产出,包括独立银矿物：硫锑铜银矿、硫银锡矿、辉硒银矿、深红银矿、脆银矿、黝锑银矿、螺状硫银矿、金银矿和自然银等;不可见银含量少,主要以类质同象形式赋存在方铅矿中。矿床成矿阶段细分为：①石英- 高Fe闪锌矿- 富Se和Bi的方铅矿- 富Se富Sb富Sn的银矿物阶段;②石英- 方铅矿- 富Fe闪锌矿- 毒砂- 富Sb富Sn少Se的银矿物阶段;③石英- 闪锌矿- 方铅矿- 银矿物阶段;④黄铁- 碳酸盐阶段。金属矿物沉淀顺序为：(黄铁矿、黄铜矿、闪锌矿、方铅矿)→银的硫盐矿物→银的硫化物→自然银。矿床中的Fe+、Cu+、Zn+、Pb+、Ag+等金属离子在早期中温高硫逸度阶段主要以硫氢络合物形式搬运。随着成矿热液温度的降低,铅、锌等金属硫氢络合物开始分解,方铅矿、黄铜矿和闪锌矿等硫化物得以沉淀,此时部分银以显微和次显微包体银的形式被包裹于这些硫化物中,铅锌硫化物的大量沉淀引起成矿热液组成和性质的显著变化,最终导致银从硫氢络合物中彻底解体,并与Cu+、Sb3+等离子结合形成大量独立银矿物(如深红银矿、硫锑铜银矿等)。随着温度、盐度持续降低,硫逸度也逐渐降低,pH值升高,成矿流体中出现大量自由Ag+并逐渐达到饱和,银矿物开始大量沉淀,Ag+与H2S发生作用形成螺状硫银矿。自然银的大量出现标志着银的沉淀过程趋于结束。金属矿物沉淀顺序为：(黄铁矿、黄铜矿、闪锌矿、方铅矿)→银的硫盐矿物→银的硫化物→银的自然金属。 相似文献
6.
Wu Daqing 《中国地球化学学报》1987,6(3):225-233
The phase diagrams of the systems Cu2S-PbS-Bi2S3 and Ag2S-PbS-Bi2S3 have been investigated in the present study. The paper is concerned with the complete solid solution between bismuthtite
and aikinite above 300°C in the system Cu2S-PbS-Bi2S3. The synthetic phases CuBi3S5 and Cu3Bi5S9 have their solid solution ranges in the ternary system with 9 and 26 mole% PbS at maximum, respectively.
A complete solid solution between PbS and AgBiS2 divides the phase diagram of the system Ag2S-PbS-Bi2S3 into two parts: Bi-rich and Ag-rich. All sulfosalt minerals and solid solutions, including pavonite ss, lillianite ss, heyovskyite
and benjaminite are on the Bi-rich side. And divarant relations were found between pavonite ss -lillianite ss, benjaminite
and bismuthtite as well as between lillianite ss -bismuthtite and galenobismutite.
Synthetic experiments using LiCl-KCl flux technique show that when a minor amount of copper (less lwt.%) is added in, many
of Ag-and Pb-bismuth sulfosalt minerals, for example, vikingite (Ag5Pb8Bi13S30), are synthesized successively, particularly at 400°C. So is heyrovskyite, which has a solid solution range with 3.7 mole%
Cu2S at maximum in the system Cu2S-PbS-Bi2S3. 相似文献
7.
本文着重内对内蒙古金,银矿产资源概况作了论述,并对全区金,银矿产资源的成因类型,分布规律及找矿标志以及金,银矿产资源供需形势,保障程度,开发前景作了分析和预测,还提出了建议与对策。 相似文献
8.
西藏斯弄多银多金属矿床产于陆相林子宗群火山岩内,是冈底斯成矿带发现的首例浅成低温热液矿床.矿床具有热液脉型银铅锌矿体、隐爆角砾岩型矿体和独立银矿体"三位一体"的矿体组合形式.热液角砾岩作为矿区主要矿(化)体,目前尚未开展详细研究工作.文章以斯弄多矿区热液角砾岩为研究对象,通过钻孔岩芯编录和岩相学研究,总结了不同类型热液角砾岩特征,旨在探讨其成因及与成矿的关系.根据热液角砾岩产状、颜色、胶结物等特征,将矿区热液角砾岩分为气喷角砾岩、岩浆蒸汽角砾岩和构造热液角砾岩三类.岩浆蒸汽角砾岩产于隐爆角砾岩筒中,根据其产状、颜色、胶结物成分差异进一步分为A类角砾岩和B类角砾岩.A类角砾岩产于Ⅰ号富矿角砾岩筒,蚀变矿物以绢云母、蒙脱石、伊利石为主;B类角砾岩产于Ⅱ号贫矿角砾岩筒,蚀变矿物以白云母、赤铁矿、黄钾铁矾为主.研究认为,与成矿作用密切相关的热液角砾岩成岩成矿作用是同一地质过程不同阶段的产物,其含矿性主要由隐爆流体性质决定.大气降水和岩浆热液不同程度的混合作用和沸腾作用是角砾岩形成和矿质沉淀的主要原因. 相似文献
9.
10.
The Quebrada Marquesa Quadrangle in Chile exhibits a series of mineralizations comprising manto-type manganese and copper
deposits of Lower Cretaceous age, and copper and silver veins of Tertiary age. The deposits are hosted by volcanic and volcaniclastic
units of the Arqueros (Hauterivian-Barremian) and Quebrada Marquesa (Barremian-Albian) Formations. Three episodes of manganese
mineralization (Mn1-3) are recognized within the study area. Hydrothermal activity leading to episodes 1 and 3 was of minor importance, while the
second one (Mn2) gave rise to major manto-type deposits of both manganese and copper in the Talcuna mining district. Extensional faulting
during Tertiary time resulted in block faulting and the unroofing of the oldest andesitic volcanics and marine sediments (Arqueros
Formation). This episode was accompanied by magmatic and hydrothermal activity leading to vein formation in the Arqueros (Ag)
and Talcuna (Cu) districts. The latter veins cross-cut the previous manto-type copper deposits. Ore mineralogy is similar
in both styles of mineralization (manto- and vein-type) and consists mainly of chalcopyrite and bornite, with variable amounts
of galena, tetrahedrite (vein-related), chalcocite, sphalerite, pyrite, hematite, digenite and covellite. Alteration processes
at Talcuna can be divided into two categories, those related to the Lower Cretaceous manto-type episode (LK alteration: chlorite-epidote-calcite-albite, prehnite, zeolite), and those associated with the locally mineralized normal faults of
Tertiary age (Tt alteration: chlorite-calcite, sericite). The Arqueros silver veins display an ore mineralogy consisting of arquerite, argentite, native
silver, polybasite, cerargyrite and pyrargyrite-proustite; associated alteration includes strong chloritization of the country
rock. The manto-type deposits formed from fluids of salinity between 11 and 19 wt.% NaCl equivalent and temperatures between
120 and 205 °C. Mineralizing fluids during the vein-type stage circulated at lower temperatures, between 70 and 170 °C, with
salinity values in a wide range from 3 to 27 wt.% NaCl equivalent. This distribution of salinities is interpreted as the result
of the complex interplay of two different processes: boiling and fluid mixing; the former is considered to control the major
mineralogical, textural and fluid inclusion features of the vein-type deposits. We suggest that the Lower Cretaceous mineralization
(manto-type stage) developed in response to widespread hydrothermal activity (geothermal field-type) involving basinal brines.
Received: 18 July 1997 / Accepted: 28 January 1998 相似文献
11.
老洞坡银矿床位于围山城成矿带东延部,出露地层由下古生界大栗树组(Pz1d)和上古生界歪头山组(Pt3w)组成。老洞坡银矿体的发现显示歪头山组地层上、中、下三部均为含矿层,银矿体受朱庄背斜,歪头山组下部第五岩性段和构造控制。查明该矿床的原、次生地球化学异常特征,将老洞坡银矿床与破山、银洞坡银矿床的地质地球化学特征进行对比研究,在指导找矿上具实际意义。 相似文献
12.
13.
用火焰原子吸收光谱法连续测定银、铜、锌 总被引：1，自引：0，他引：1
试样经NH4F,HCl,HNO3分解的酸性介质中,选用NaCl做配合剂,Ag,Cu,Zn可以同时进入溶液。但由于上机测定时背景吸收严重,而所使用的原子吸收分光光度计不能扣除背景。选用硫脲做配合剂时,可使Ag生成稳定无色的Ag[CS(NH2)2]Cl配合物,从而避免溶液中生成AgCl沉淀,同时也使测定时的酸度得到有效的降低。原来需要分别取样、溶解和测定Ag,Cu,Zn的操作,得以在同一份样品中完成。用火焰原子吸收分光光度计连续测定Ag,Cu,Zn,方法的测定范围分别为Ag0 n×10-6～5000 0×10-6;Cu0 00n%～n 000%;Zn0 00n%～n 000%。 相似文献
14.
15.
对冀北１７个银矿床地质调查和５个大一中型银矿床地质、地球化学剖析研究基础上,从银矿床产出的区域地质、矿床地质、控制地质条件、围岩蚀变、矿石类型、成矿机理、成矿时代和成矿物质演化上,确定了冀北银矿床有３个成矿系列,８种矿床类型。提出牛圈子为火山喷气－热泉型银矿床;蔡家营为古喷气－热水沉积变质－热液叠加型铅锌银矿床;银冶岭为层控－热液叠加型铅锌银矿床的新认识,建立了冀北银矿床成矿模式和地史演化的区域成 相似文献
16.
用ICP-AES法测定银精矿中银铜铅锌砷 总被引：3，自引：0，他引：3
研究了在王水介质中用ICP－AES法同时测定银精矿中银、铜、铅、锌、砷的分析方法，进行了加标回收试验，回收率为92％－107％，相对标准偏差2．3％－11％，确定了各元素的测定下限，与行业标准进行了方法对照实验。本方法已用于矿样的测定。 相似文献
17.
用抽真空石英管在干体系中对Ａｇ２Ｓ－Ｔｌ２Ｓ假二元系在２５０℃下变温切面相平衡进行了实验研究。Ａｇ２Ｓ－Ｔｌ２Ｓ假二元系在２５０℃存在三个三元合成相，它们分别为ＴｌＡｇＳ、Ａｇ２９Ｔｌ１１Ｓ２０和Ａｇ１７Ｔｌ３Ｓ１０，后两个相是该实验首次合成 相似文献
18.
《Russian Geology and Geophysics》2015,56(12):1738-1748
The relationships and chemical compositions of silver sulfoselenides in the ores of the Rogovik gold-silver deposit (northeastern Russia) were studied to refine the low-temperature region of the Ag2S-Ag2Se phase diagram and identify contradictions between natural and experimental data. Two types of relationships between the phases of the system Ag2S-Ag2Se have been recognized using optical and scanning electron microscopy: (1) Se-acanthite and S-naumannite occur as monomineral microinclusions or fill cracks in the grains or the interstices of other minerals, and acanthite (free of impurities) forms rims on Fe-sphalerite; (2) Se-acanthite forms rims on S-naumannite. Electron probe microanalysis of silver sulfoselenides from the Rogovik ores revealed 0–7.9 wt.% Se in acanthite and 0–3.2 wt.% S in naumannite, which corresponds to the acanthite series Ag2S-Ag2S0.74Se0.26 and naumannite series Ag2S0.28Se0.72-Ag2Se. The composition ranges of the studied acanthite and naumannite series are wider than those of natural silver sulfoselenides from the Guanajuato (Mexico), Silver City (USA), Salida (Indonesia), and other deposits (Ag2S-Ag2S0.85Se0.15 and Ag2S0.12Se0.88-Ag2Se, respectively) but are significantly narrower than the composition ranges of synthetic samples: Ag2S-Ag2S0.4Se0.6 and Ag2S0.3Se0.7-Ag2Se. The presence of intergrowths of two phases of the Ag2S-Ag2Se series in the form of Se-acanthite rims on S-naumannite in the Rogovik ores and the absence of three-phase intergrowths of silver sulfoselenides Ag2S1 -xSex from this and other deposits do not confirm the assumption on the existence of the third solid solution. The results of earlier studies of natural Ag2(S,Se) solid solutions show the existence of two solid solutions (of the acanthite and naumannite series) in the Ag2S-Ag2Se system and confirm the experimental data. It is necessary to carry out a detailed examination of natural silver sulfoselenides falling in the interval from Ag2S0.4Se0.6 to Ag2S0.3Se0.7 in order to identify the limits of two-phase immiscibility. 相似文献
19.
马圈一带出露的主要地层为上元古界栾川群和中元古界官道口群,是Pb、Zn、Ag的主要含矿地层.燕山期花岗岩在空间上与矿化关系密切.矿体主要受北西向断裂控制,常分布在北西、北东向断裂构造交汇部位.根据地球化学特征、矿产分布规律和找矿标志,划分出百炉沟西凹—东凹—磨沟、百炉沟—黄花北沟—杨树凹等两个一级和银窝沟—大石渣沟—小石渣沟、板岔沟等两个二级找矿预测区. 相似文献
20.
武夷山地区是一个有色、贵金属、稀有、稀土矿床的重要找矿远景区。通过对该区地质背景、成矿地质条件、矿床富集规律的分析归纳,指出该区以政和-大埔深大断裂为界,其外带（沿海）中生代火山岩大面积出露,内带则常呈一些孤立的火山断陷盆地分布,矿床与火山-侵入岩浆热液作用有密切的成因联系,中生代不同的火山-次火山活动旋回,对该区成矿作用、成矿系列有重要控制作用。 相似文献