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首页> 外文期刊>Chinese Journal of Geochemistry >Origin of Ore-Forming Fluids of Mississippi Valley-Type (MVT) Pb-Zn Deposits in Kangdian Area, China
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Origin of Ore-Forming Fluids of Mississippi Valley-Type (MVT) Pb-Zn Deposits in Kangdian Area, China

机译：中国康甸地区密西西比河谷型（MVT）铅锌矿床成矿流体的成因

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Analyses of fluid-inclusion leachates from ore deposits show that Na/Br ratios are within the range of 75 -358 and Cl/Br 67-394, respectively, and this variation trend coincides with the seawater evaporation trajectory on the basis of the Na/Br and Cl/Br ratios. The average Cl/Br and Na/Br ratios of mineralizing fluids are 185 and 173 respectively, which are very close to the ratios ( 120 and 233) of the residual evaporated seawater past the point of halite precipitation. It is suggested that the original mineralizing brine was derived from highly evaporated seawater with a high salinity. However, the inclusion fluids have absolute Na values of 69. 9 -2606. 2 mmol kg~(-1) and Cl values of 106. 7 - 1995. 5 mmol kg~(-1). Most of the values are much less than those of seawater; Na, 485 mmol kg~(-1) and Cl, 566 mmol kg~(-1), respectively; the salinity measured from fluid inclusions of the deposits ranges from 2.47 wt% to 15. 78 wt% NaCl equiv. The mineralizing brine has been diluted. The ? ~(18)O and Δd values of ore-forming fluids vary from -8. 21 per thousand to 9. 51 per thousand and from -40.3 per thousand to -94.3 per thousand, respectively. The Δd values of meteoric water in this region varied from-80 per thousand to-100 per thousand during the Jurassic. This evidenced that the ore-forming fluids are the mixture of seawater and meteoric water. Highly e-vaporated seawater was responsible for leaching and extracting Pb, Zn and Fe, and mixed with and diluted by descending meteoric water, which resulted in the formation of ores.
机译：对矿床流体包裹体渗滤液的分析表明，Na / Br比分别在75 -358和Cl / Br 67-394范围内，这种变化趋势与基于Na / Br的海水蒸发轨迹相吻合。 Br和Cl / Br比。矿化液的平均Cl / Br和Na / Br比分别为185和173，非常接近经过盐酸盐沉淀点的残留蒸发海水的比值（120和233）。建议原始的矿化盐水是从高盐度的高度蒸发的海水中提取的。但是，包裹体流体的绝对Na值为69. 9 -2606。 2 mmol kg〜（-1），Cl值为106. 7-1995。5 mmol kg〜（-1）。大多数价值远低于海水价值； Na分别为485 mmol kg〜（-1）和Cl 566 mmol kg〜（-1）;从沉积物的流体夹杂物测得的盐度范围为2.47重量％至15重量％。矿化盐水已被稀释。 ？成矿流体的〜（18）O和Δd值​​在-8之间变化。从千分之21降到9.。千分之51和从千分之40.3到千分之-94.3。在侏罗纪期间，该区域的陨石水的Δd值从-80 /千变化到100 /千。这证明成矿流体是海水和大气水的混合物。高度蒸发的海水负责铅，锌和铁的浸出和萃取，并与下降的流水混合并通过降水稀释，从而导致矿石的形成。

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