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| Dekov, Vm; Damyanov, Zk. |
| In the axial metalliferous oozes of the East Pacific Rise, accessory amounts of shiny metallic grains occur. Optical microscope, SEM, microprobe and XRD analytical techniques have permitted detailed mineralogical study of these grains and established a hitherto unknown (in seafloor sediments, rocks and ores) Ag71.5Cu28.5 alloy. An endogenous hypothesis of the formation of the extremely small amounts of these alloy particles dispersed in the metalliferous sediments is suggested on the basis of a precise investigation of alloy micromorphology, chemical composition, inner texture and temporal distribution. According to the proposed hypothesis, native silver-copper grains are formed as ultra-accessory micro-segregations in a silicate matrix during the mantle... |
| Tipo: Text |
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| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20460/18132.pdf |
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| Dekov, Vm; Damyanov, Zk; Kamenov, Gd; Bonev, Ik; Rajta, I; Grime, Gw. |
| A number of small, irregular-shaped and spherical shiny metallic particles have been found in the sediments from the Mir zone, Trans-Atlantic Geotraverse hydrothermal held (Mid-Atlantic Ridge, 26 degreesN). The phase variety of the particles examined is represented by metallic tin: tin-rich lead, and tin-copper phases. A detailed mineralogical study of these particles was carried out using optical microscopy, nuclear microscopy, scanning electron microscopy, electron microprobe, proton microprobe and X-ray diffraction analysis. Tin-lead grains have the typical eutectic microtexture of the metal components. Tin-copper grains are formed from single crystals of sorosite, eta -Cu6Sn5. The Sn-Pb-Cu complex grains are composed of fine stannoan lead... |
| Tipo: Text |
Palavras-chave: Zone hydrothermale; Dorsale médio-Atlantique; Étain et plomb natifs; Sorosite; Hydrothermal field; Mid-Atlantic Ridge; Native Sn and Pb; Sorosite. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43350/42876.pdf |
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