DECOMPRESSION EXPERIMENTS AS AN INSIGHT INTO ASCENT RATES OF SILICIC MAGMAS
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dc.contributor.author | Martel C. | |
dc.contributor.author | Schmidt B.C. | |
dc.date.accessioned | 2021-11-28T04:25:37Z | |
dc.date.available | 2021-11-28T04:25:37Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14237408 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2003, 144, 4, 397-415 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32566 | |
dc.description.abstract | An experimental study of H2O exsolution, bubble growth and microlite crystallisation during ascent (decompression) of silicic magmas in the volcanic conduit is presented. Isobaric and decompression experiments were performed on a rhyolitic melt at 860 C, NNO+1, H2O saturation, and pressures between 15 and 170 MPa. Two sets of decompression experiments were performed, with decompression rates varying between 0.001 and 960 MPa/min: (1) from 150 to 50 MPa (high-pressure decompression), and (2) from 50 to 15 MPa (low-pressure decompression). The experiments highlight incomplete H2O exsolution for decompression rates>100 MPa/min, incomplete bubble growth for decompression rates>0.1 MPa/min, crystal nucleation time lags, and incomplete chemical re-equilibration to final pressures. The observed crystallisation process, i.e. growth versus nucleation, depends on the decompression range. Indeed, decompression-induced crystallisation during high-pressure decompressions is dominated by growth of existing crystals, whereas during low-pressure decompressions crystal nucleation is the dominating process. This study provides a means to infer magma ascent rates in eruptions of silicic magmas through a combined petrologic and experimental approach. | |
dc.title | DECOMPRESSION EXPERIMENTS AS AN INSIGHT INTO ASCENT RATES OF SILICIC MAGMAS | |
dc.type | Статья |
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