| 蔡家营铅—锌—银矿床的稳定同位素地球化学研究 |
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| 引用本文： | 黄曲豪,张长江.蔡家营铅—锌—银矿床的稳定同位素地球化学研究[J].地球化学,1997,26(4):24-25. |
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| 作者姓名： | 黄曲豪 张长江 |
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| 作者单位： | [1]中国地质科学院矿床地质研究所 [2]河北地质矿产局第三地质大队 |
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| 摘 要： | 河北蔡家营矿床是大型中温热液充填－交代脉型铅－锌－银矿床。其硫化物的δ＾３４Ｓ值为２．２‰－７．８‰，同世代共存的１０个硫化物对的Δ＾３４Ｓ值表明，Ｆｅ－（Ｚｎ、Ｐｂ）－Ｓ系统的硫同位素非平衡分馏占主导，硫是岩浆（为主）与老变质岩层硫的混合来源。石英及其流体包裹体的δ＾１８ＯＳＭＯＷ和δＤＳＭＯＷ值（‰）按混合模式计算表明，成矿流体为混合的岩浆和大气降水，早期成矿流体以岩浆为主，尔后则变为以大气降
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| 关 键 词： | 铅锌矿床 银矿床 稳定同位素 地球化学 |
STUDY ON STABLE ISOTOPIC GEOCHEMISTRY OF CAIJIAYINGPb-Zn-Ag DEPOSIT,HEBEI PROVINCE,CHINA |
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| Huang Dianhao Wu Chengyu.STUDY ON STABLE ISOTOPIC GEOCHEMISTRY OF CAIJIAYINGPb-Zn-Ag DEPOSIT,HEBEI PROVINCE,CHINA[J].Geochimica,1997,26(4):24-25. |
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| Authors: | Huang Dianhao Wu Chengyu |
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| Abstract: | The Caijiaying large-scale Pb-Zn-Ag deposit is a mesothermal filling-metasomatic vein deposit 34 S values measured on 49 sulfide samples range from 2.2% - 7.8%, with an average of 5.2%. Among 34S values calculated on coexisting sulfide pairs, there are not only negatives but also positives (relative low), suggesting that a non - equilibrium sulfur- isotopic fractionation dominated during the mineralization process. With the fact of absence of sulfate mineals. HS- and S2-. are. considered to be the main sulfur. species in the hydrothermal system, and sulfur isotopic fractionalion between HS- and pyrite is insignificant at the temperature range ( 1 80- 320) of mineralization.An...average 34Spv value(+ 4.6) of 1 5 pyrite samples may be approximately regarded as the 34Ss of the system Therefore,the sulfur source of the ores is mainly derived from granitic magmas. 18 O (SMOW) values measured on 6 quartz samples are between 13.1%and 14.4%ll,18OHo(SMOWy), .,-d tl tl i. .qlilibll- .ith tbl qllllb, - lltll.. 2.0/lll ld 8.3/lll, ald d D ll. (SMOW) values between-76 % and -109 %. - This demonstrates a magmatic - meteoric mixed water origin for the mineralizing fluid, based on calculations of water - wall rock isotopic interactions. The magmatic water components dominated in the early stage of the mineralizadtion, while the meteoric water dominated in the late stage. . 13 Cco. (PDB) values are from -3.% to -4.8%, calculated on measured values of calcites,supporting a mixed carbon source between those from magmatic origin and those extracted from marble in metamorphic sequence. The physico-chemical parameters of the mineralizing fluid are estimated to be lgfo2 -36.8--38.5, lgfs2 - 10- - 13, lgfco2 3.0 and pH 4.4-5.4, indicating a weak acid, reduce and high sulfur environment during the ore---formation. |
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| Keywords: | Pb-Zn-Ag deposit stable isotope mixed hydrothemal fluids Hebei Province |
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