THE DEPTH OF THE SPINEL TO GARNET TRANSITION AT THE PERIDOTITE SOLIDUS
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dc.contributor.author | Robinson J.A.C. | |
dc.contributor.author | Wood B.J. | |
dc.date.accessioned | 2020-12-29T10:10:05Z | |
dc.date.available | 2020-12-29T10:10:05Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=99844 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1998, , 1, 277-284 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21679 | |
dc.description.abstract | We have determined the pressure and temperature of the spinel-garnet transition close to the solidus of fertile and depleted peridotite from a combination of synthesis, sandwich and garnet-seeded experiments. Garnet is unstable in MORB-Pyrolite below 2.8 GPa (depths <85 km) at a solidus temperature of 1470°C. In Tinaquillo Lherzolite, which is related to MORB-Pyrolite by about 7% fractional melting, the transformation occurs at 3.1 GPa at a solidus temperature of 1520°C. In both cases the transformation interval is narrow, approximately 0.1-0.2 GPa. Because the solidus temperature increases by 7°C and the spinel-garnet transformation pressure by 0.05 GPa for every 1% melt extracted, extremely high potential temperatures (Tp > 1450°C) are required to generate the 3-5% melting in the garnet field implied by recent trace element and isotope studies. It appears likely, therefore, that the `garnet signature' arises from some mechanism other than anhydrous melting of garnet peridotite. | |
dc.subject | PERIDOTITES | |
dc.subject | SPINEL | |
dc.subject | GARNET GROUP | |
dc.subject | LHERZOLITE | |
dc.subject | PYROLITE | |
dc.title | THE DEPTH OF THE SPINEL TO GARNET TRANSITION AT THE PERIDOTITE SOLIDUS | |
dc.type | Статья |
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