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首页> 外文期刊>Geology of Ore Deposits: A Journal of Theoretical and Applied Papers on All Aspects of Ore Genesis >Mineralogical-Geochemical Peculiarities of Hydrothermal Sulfide Ores and Fluids in the Rainbow Field Associated with Serpentinites, Mid-Atlantic Ridge (36 deg 14 min N)
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Mineralogical-Geochemical Peculiarities of Hydrothermal Sulfide Ores and Fluids in the Rainbow Field Associated with Serpentinites, Mid-Atlantic Ridge (36 deg 14 min N)

机译：大西洋中脊（36 deg 14 min）与蛇纹岩相关的彩虹场中热液硫化物矿石和流体的矿物地球化学特殊性

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The paper considers results of direct geological-geochemical observations of the modem Rainbow hydrothermal field (Mid-Atlantic Ridge, 36 deg 14 min N; 33 deg 54 min W) carried out from manned Mir submersibles during Cruises 41 and 42 of the R/V AkademikMstislav Keldysh in 1998-1999 and the data of laboratory studies of collected samples. The field lacks neovolcanic rocks, and the axial part of the rift is filled in with a serpentinite protrusion. Developed in this field are metalliferous sediments, as well as active and relict sulfide edifices composed of pyrrhotite, chalcopyrite, isocubanite, sphalerite, marcasite, pyrite, bornite, chalcosine, digenite, magnetite, anhydrite, rare troilite, wurtzite, millerite, and pentlandite with a high content of Cu and Zn ores. Sulfide ores are characterized by concentric-zoned textures. The temperature of hydrothermal solutions varies from 250 to 350 deg C over 35 min. The calculated chemical and isotopic composition of hydrothermal solution shows the elevated content of Cl, Ni, Co, CH_4, and H_2. The #delta#~(34)S_(H_2S), #delta#~(13)C_(CH_4), and #delta#~(13)C_(CO_2)) are equal to +2.4...+3.1, -15.2 11.2, and +1.0 4.0 (per thousand), respectively. Fluid inclusions are homogenized at temperatures of 140-360 deg C, whereas the salinity of the fluid varies from 4.2 to 8.5 wt %. The #delta#~(34)S values of sulfides range from + 1.3 to + 12.5(per thousand). The ~3He/~4He ratio in mineral-forming fluid contained in fluid inclusions from sulfides of the Rainbow field varies from 3.74 to 10.1 x 10~(-6). The hydrothermal activity in the area was shown to continue approximately 100 kyr. It is assumed that the fluid and sulfide edifices contain components from the upper mantle. The hypothesis of phase separation of the supercritical fluid that results in formation of brines is proposed. The hydrothermal activity is related to the tectonic, not volcanic, phase of the Mid-Atlantic Ridge evolution.
机译：本文考虑了在R / V巡航41和42期间从载人的Mir潜水器进行的现代Rainbow水热场（中大西洋海脊，北纬36度14分;北纬33度54分）的直接地质地球化学观测结果。 AkademikMstislav Keldysh在1998年至1999年间以及收集到的样本的实验室研究数据。该油田缺少新火山岩，裂谷的轴向部分充满了蛇纹岩突起。在该领域开发的是含金属的沉积物，以及由黄铁矿，黄铜矿，异铜矿，闪锌矿，镁铁矿，黄铁矿，堇青石，黄铜矿，辉绿岩，磁铁矿，硬石膏，硬石膏，稀有的三叶草，纤锌矿，菱镁矿和辉石组成的活性和遗留硫化物大厦高含量的铜和锌矿石。硫化矿的特征是同心带状纹理。水热溶液的温度在35分钟内从250到350摄氏度变化。计算得出的热液化学组成和同位素组成表明，Cl，Ni，Co，CH_4和H_2的含量升高。 ＃delta＃〜（34）S_（H_2S），＃delta＃〜（13）C_（CH_4）和＃delta＃〜（13）C_（CO_2））等于+2.4 ... + 3.1，- 15.2 11.2和+1.0 4.0（每千）。流体夹杂物在140-360℃的温度下被均质化，而流体的盐度在4.2至8.5wt％之间变化。硫化物的＃delta ~~（34）S值范围为+ 1.3至+ 12.5（千分之一）。彩虹场硫化物流体包裹体中矿物形成流体中〜3He /〜4He的比值在3.74到10.1 x 10〜（-6）之间变化。该地区的水热活动持续约100年。假定流体和硫化物大厦包含来自上地幔的成分。提出了导致盐水形成的超临界流体的相分离的假设。水热活动与中大西洋海岭演化的构造而非火山相有关。

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