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白牛厂银多金属矿床银的赋存形式及银矿物特征 总被引:2,自引:0,他引:2
矿床产在燕山期花岗岩外接触带,受北西向层间滑动构造破碎带控制。含矿热液沿构造破碎带充填,形成规模很大的、连续性极好的、银锡铅锌均分别达到大型的复合矿体。成矿具多成因、多期、多阶段的特点。银主要呈银矿物形式存在,银矿物又主要是多阶段的银锑-银铜锑-银铅锑等硫盐矿物。银矿物粒度很细,多呈包嵌形式存在,与方铅矿关系特别密切。经矿相配合能谱系统研究,辅以部分单矿物分析,初步查明其分布、富集、相互关系及矿物物性特征。 相似文献
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对Ag_2S-Cu_2S-PbS-Bi_2S_3四元体系内铋硫盐矿物的类质同象取代类型的研究表明,它共有四种:配对取代Ag(Cu)+Bi=2Pb,简单取代Ag=Cu,Bi(Pb)=Cu和Cu原子填隙(以平衡Bi或Pb为Cu取代时电价差)。研究还给出了体系内10个重要固溶体的成分及结晶参数之间的关系。对这些固溶体及铜、银、铅铋硫盐矿物结构特征、共生和共生长关系研究表明,它们可以分成四个系列:块硫铋银矿、硫铋铅矿、辉铋矿-针硫铋铅矿、贺硫铋铜矿。 相似文献
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本文用抽真空石英管在干体系中对Tl-Ge-S三元系在300℃等温切面相关系和沿Tl_2-GeS_2及Tl_2-GeS变温切面假二元系相平衡进行了实验研究。 Tl-Ge-S三元系在300℃为三个液相区与三个二元相、八个三元相(包括三个固溶体)和十四个两相区、二十四个三相区稳定共存的复杂相关系。本实验首次合成了三个三元相(Tl_2Ge_(1-x)S_2、Tl_5Ge_(13)S_(24)、TlGe_3S_5)和三个固溶体相,即S·S·a(Tl_2~+Ge~(4+)S_3~Tl_2~+Ge_2~(2+)S_3)、S·S·b(Tl~+Ge_(0.5)~(2+)Ge_(0.5)~(4+)S_2~Tl~+Ge_3~(2+)S_4),S·S·c(Tl~+Ge_2~(2+)S_3~Tl_2~+Ge_5S_6)。 相似文献
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《Resource Geology》2018,68(3):209-226
Shin‐Otoyo, Suttsu, Teine, Date, Chitose, and Koryu are sites rich in precious and base metal Miocene–Pleistocene epithermal deposits, and located in southwestern Hokkaido, Japan. The deposits are predominantly hosted by the Green Tuff Formation of Middle Miocene age. Ore petrographic study of these deposits shows the occurrence of variable quantities of Cu–As–Sb–Ag–Bi–Pb–Te sulfosalt minerals. Determination of mineralogical and chemical compositions of the sulfosalt minerals was undertaken to elucidate the time and spatial changes of the sulfide‐sulfosalt minerals. Various types of sulfosalt minerals identified from gold–silver and base metal quartz–sulfide veins represented some sulfosalt mineralization phases, such as the Cu–Fe–Sn–S phase of mawsonite and stannite; Cu–(As,Sb)–S phase of tetrahedrite–tennantite and luzonite–famatinite series minerals; (Cu,Ag)–Bi–Pb–S phase of emplectite, pavonite, friedrichite, aikinite, and lillianite–gustavite series minerals; (Ag,Cu)–(As,Sb)–S phase of proustite–pyrargyrite and pearceite–polybasite series minerals; and Bi–Te–S phase of tetradymite and kawazulite minerals. There are some trends in the paragenetic sequence of sulfosalt mineralization in southwestern Hokkaido (in complete or partial) as follows: sulfide → Cu–Fe–Sn–S → (Cu,Ag)–Bi–Pb–S → (Bi–Te–S) → Cu–(As,Sb)–S → ([Ag,Cu]–[As,Sb]–S). The formation of sulfosalt minerals is characterized by the introduction of some elements such as Sn, Bi, and Te at an earlier stage and an increase or decrease of some elements such as As and Sb, followed by the introduction of Ag at the later stage of ore mineral paragenesis sequence. Mineral composition of the Chitose and Koryu deposits are slightly different from those of Shin‐Otoyo, Suttsu, Teine, and Date due to their lack of Sn (tin) and Bi (bismuth) mineralization. The variable concentrations and relationships are not simply with redistributed trace elements from the original sulfide minerals of chalcopyrite, pyrite, galena, and sphalerite. Some heavier elements were also introduced during the replacement reaction, which is consistent with the occurrence of their associated minerals. 相似文献
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呷村式银多金属矿产于义敦岛弧发育晚期环境,在成因上与钙碱性火山岩系的偏酸性流纹质火山岩的海底喷发作用有关。矿带位于流纹质火山岩顶部与上覆结晶灰岩的接触界面附近,由上而下依次分为重晶石—铜铅锌银—铅锌三个矿体带。矿床地质的和地球物理的找矿标志明显。实践证明,以岛弧火山岩为对象,综合运用地质、物探、化探成果,在判定火山杂岩体的矿化地段,进行工程揭露验证是经济有效的找矿模式。 相似文献
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目前,我国金属矿床中见到铋硫盐矿物共46种,其中有8种未定名矿物。在PbS_Bi2S3系列矿物中,实验矿物学(L.L.Y.Chang)上已有的10种PbS-Bi2O3系列矿物,即由富硫铋铅矿→硫铋铅矿→针辉铋铅矿→柱辉铋铅矿→斜方辉铋铅矿→卡辉铋铅矿→辉铋铅矿→杂硫铅铋矿→斜方硫铋铅矿→柱硫铋铅矿,我国应有尽有外,还发现有4种PbS-Bi2S3的未定名的矿物。块辉铋铅银矿中暂定的3个亚各,我 辄全 相似文献
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本文用抽空石英管法对三元硫化物体系Ag_2S-PbS-Bi_2S_3和Cu_2S-PbS-Bi_2S_2的500℃相关系进行了研究。Cu_2S-PbS-Bi_2S_3体系的相图特征是Bi_2S_3-CuPbBiS_3。之间完全固溶关系,以及它与二元系Cu_2S-Bi_2S_3和PbS-Bi_2S_3各相之间双变关系。Ag_2S-PbS-Bi_2S_3体系相图被PbS-AgBi_S_2之间的完全固溶关系分成两部分:富铋与富银。富银部分仅有辉银矿与PbS-AgBiS_2固溶体之间简单双变关系,而富铋部分却包含丰富的银、铅铋硫盐。在抽空石英管法500℃下合成成功的有块硫铋银矿固溶体、铜银铅铋矿、硫铋铅矿固溶体、富硫铋铅矿和辉铅铋矿。 以上两个体系中矿物之间共生长关系及稳定范围也作了简短讨论。 相似文献
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桂阳宝山铅锌银矿中部铅锌矿伴生银赋存特征 总被引:6,自引:0,他引:6
宝山中部沿锌矿属中低温热液充填交代型矿床,伴生银平均品位为233g/t。银的主要载体矿物为方铅矿,闪锌矿。银呈独立矿物相为主,(含)银矿物共12种,为一系列复杂的硫盐矿物。银易于随主金属铅锌一起回收,理想回收率达93.77%。 相似文献