CALCULATED PHASE EQUILIBRIA FOR LOW- AND MEDIUM-PRESSURE METAPELITES IN THE KFMASH AND KMNFMASH SYSTEMS
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Wei C.J. | |
dc.contributor.author | Powell R. | |
dc.contributor.author | Clarke G.L. | |
dc.date.accessioned | 2022-09-23T00:35:27Z | |
dc.date.available | 2022-09-23T00:35:27Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=6630831 | |
dc.identifier.citation | Journal of Metamorphic Geology, 2004, 22, 5, 495-508 | |
dc.identifier.issn | 0263-4929 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38718 | |
dc.description.abstract | Petrogenetic grids in the KFMASH and KMnFMASH model systems calculated with the software thermocalc 3.1 are presented for the P-T range 0.5-12 kbar and 450-900 °C, for assemblages involving garnet, muscovite, chloritoid, biotite, chlorite, staurolite, cordierite, spinel, orthopyroxene, K-feldspar, Al2 SiO5 phases, quartz, water and melt. Based on calculated compatibility diagrams and P-T and T-M Mn [Mn/(Mg + Fe + Mn)] pseudosections for different metapelitic bulk compositions, the principal conclusions are that the addition of Mn to the KFMASH system: (i) enhances the stability of garnet, and, to a lesser extent, aluminosilicates; (ii) reduces the stability of staurolite, cordierite and, to a lesser extent, chlorite; and (iii) extends the medium pressure stability of muscovite and the low-P stability field of K-feldspar. The influence of Mn on individual mineral stabilities is strongly related to rock composition, in particular, to the relative contents of Al2 O3 and K2 O. For metapelites of a range of compositions and M Mn values, P-T pseudosections in the KFMASH system, in most cases, do not adequately predict the mineral assemblages observed in natural assemblages under medium and low-pressure conditions. In contrast, the P-T pseudosections in the KMnFMASH system generally provide more satisfactory results, suggesting that MnO is one of the non-KFMASH components that should not be neglected in documenting the phase equilibria of medium- and low-P metapelites. | |
dc.subject | KFMASH AND KMNFMASH SYSTEMS | |
dc.subject | PHASE EQUILIBRIA | |
dc.subject | THERMO-CALC | |
dc.title | CALCULATED PHASE EQUILIBRIA FOR LOW- AND MEDIUM-PRESSURE METAPELITES IN THE KFMASH AND KMNFMASH SYSTEMS | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru