CONTACT METAMORPHISM OF FE- AND AL-RICH GRAPHITIC METAPELITES IN THE TRANSANGARIAN REGION OF THE YENISEI RIDGE, EASTERN SIBERIA, RUSSIA
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dc.contributor.author | Likhanov I.I. | |
dc.contributor.author | Reverdatto V.V. | |
dc.contributor.author | Sheplev V.S. | |
dc.contributor.author | Verschinin A.E. | |
dc.contributor.author | Kozlov P.S. | |
dc.date.accessioned | 2021-02-16T10:48:38Z | |
dc.date.available | 2021-02-16T10:48:38Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13366485 | |
dc.identifier.citation | Lithos, 2001, 58, 1-2, 55-80 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24999 | |
dc.description.abstract | Prograde evolution of minerals in Fe- and Al-rich graphitic metapelites in the Ayakhtinsk aureole, Siberia, produced the unusual contact metamorphic mineral assemblages: chloritoid+biotite, chloritoid+biotite+andalusite and cordierite+garnet+muscovite. Field-petrologic observations show that: (1) the grade of contact metamorphism ranges from chloritoid to sillimanite–alkali feldspar zone; (2) chloritoid+biotite assemblages have a restricted temperature interval and give way up-grade to garnet+chlorite assemblages; and (3) garnet+chlorite assemblages have a wide temperature interval and give way to cordierite+biotite parageneses with increasing grade. Geothermobarometry and thermodynamic analysis of mineral equilibria give estimates of the P–T–XH2O conditions of the contact metamorphism: the temperatures increase toward the intrusive contact from 430 to 640 °C at P=3.2±0.3 kbar, XH2O for the metamorphic fluid decreases toward the intrusive contact from 0.89–0.85 at T=450 °C to 0.49–0.36 at T=640 °C, assuming ideal and non-ideal mixing, respectively, of H2O–CO2 in the fluid phase. The stability of the rare mineral assemblages chloritoid+biotite and chloritoid+biotite+andalusite within the contact aureole can be explained by the unusual combination of pressure (>3 kbar) and Fe- and Al-rich bulk-rock compositions. The local occurrence of the cordierite+garnet+muscovite mineral assemblage is controlled by Mn in the garnet composition and Fe- and Al-rich bulk-rock composition than P–T conditions. Our data are compatible with the KFMASH grid of Spear and Cheney [Contrib. Mineral. Petrol. 101 (1989) 149.]. | |
dc.subject | Contact metamorphism | |
dc.subject | Pelitic schists | |
dc.subject | Chloritoid | |
dc.subject | Yenisei Ridge | |
dc.title | CONTACT METAMORPHISM OF FE- AND AL-RICH GRAPHITIC METAPELITES IN THE TRANSANGARIAN REGION OF THE YENISEI RIDGE, EASTERN SIBERIA, RUSSIA | |
dc.type | Статья |
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