GEOCHEMISTRY OF MAGMATIC GASES FROM KUDRYAVY VOLCANO, ITURUP, KURIL ISLANDS
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dc.contributor.author | Taran Yu.A. | |
dc.contributor.author | Hedenquist J.W. | |
dc.contributor.author | Korzhinsky M.A. | |
dc.contributor.author | Tkachenko S.I. | |
dc.contributor.author | Shmulovich K.I. | |
dc.date.accessioned | 2020-12-03T08:38:24Z | |
dc.date.available | 2020-12-03T08:38:24Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=31083228 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1995, , 9, 1749-1761 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20281 | |
dc.description.abstract | Volcanic vapors were collected during 1990–1993 from the summit crater of Kudryavy, a basaltic andesite volcano on Iturup island in the Kuril arc. The highest temperature (700–940°C) fumarolic discharges are water rich (94–98 mole% H2O and have δD values of −20 to −12%o. The chemical and water isotope compositions of the vapors (temperature of thirteen samples, 940 to 130°C) show a simple trend of mixing between hot magmatic fluid and meteoric water; the magmatic parent vapor is similar in composition to altered seawater. The origin of this endmember is not known; it may be connate seawater, or possibly caused by the shallow incorporation of seawater into the magmatic-hydrothermal system. Samples of condensed vapor from 535 to 940°C fumaroles have major element trends indicating contamination by wall-rock particles. However, the enrichment factors (relative to the host rock) of many of the trace elements indicate another source; these elements likely derive from a degassing magma. The strongest temperature dependence is for Re, Mo, W, Cu, and Co; highly volatile elements such as Cl, I, F, Bi, Cd, B, and Br show little temperature dependence. The Re abundance in high-temperature condensates is 2–10 ppb, sufficient to form the pure Re sulfide recently discovered in sublimates of Kudryavy. Anomalously high I concentrations (1–12 ppm) may be caused by magma-marine sediment interaction, as Br/I ratios are similar to those in marine sediments. | |
dc.title | GEOCHEMISTRY OF MAGMATIC GASES FROM KUDRYAVY VOLCANO, ITURUP, KURIL ISLANDS | |
dc.type | Статья |
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