EVIDENCE FROM FE- AND AL-RICH METAPELITES FOR THRUST LOADING IN THE TRANSANGARIAN REGION OF THE YENISEY RIDGE, EASTERN SIBERIA
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dc.contributor.author | Likhanov I.I. | |
dc.contributor.author | Polyansky O.P. | |
dc.contributor.author | Reverdatto V.V. | |
dc.contributor.author | Memmi I. | |
dc.date.accessioned | 2022-10-01T05:54:59Z | |
dc.date.available | 2022-10-01T05:54:59Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=13473560 | |
dc.identifier.citation | Journal of Metamorphic Geology, 2004, 22, 8, 743-762 | |
dc.identifier.issn | 0263-4929 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38864 | |
dc.description.abstract | In the Transangarian region of the Yenisey Ridge in eastern Siberia (Russia), Fe- and Al-rich metapelitic schists of the Korda plate show field and petrological evidence of two superimposed metamorphic events. An early middle Proterozoic event with age of c.1100 Ma produced low-pressure, andalusite-bearing assemblages at c. 3.5–4 kbar and 540–560 °C. During a subsequent late Proterozoic event at c. 850 Ma, a medium-pressure, regional metamorphic overprint produced kyanite-bearing mineral assemblages that replaced minerals formed in the low-pressure event. Based on the results of geothermobarometry and P–T path calculations it can be shown that pressure increased from 4.5 to 6.7 kbar at a relatively constant temperature of 540–600 °C towards a major suture zone called the Panimba thrust. In order to produce such nearly isothermal loading of 1–7 °C km −1, we propose a model for the tectono-metamorphic evolution of the study area based on crustal thickening caused by south-westward thrusting of the 5–7 km-thick upper-plate metacarbonates over lower-plate metapelites with velocity of c. 350 m Myr−1. A small temperature increase (up to 20 ± 15 °C) of the upper part of the overlapped plate is explained by specific behaviour of steady-state geotherms calculated using lower radioactive heat production of metacarbonates as compared with metapelites. The suggested thermal-mechanical model corresponds well with P–T paths inferred from obtained thermobarometric data and correlates satisfactorily with P–T trajectories predicted by other two-dimensional thermal models for different crustal thickening and exhumation histories. | |
dc.subject | andalusite–kyanite phase transition | |
dc.subject | Fe- and Al-rich metapelites | |
dc.subject | tectono-thermal model | |
dc.subject | thermobarometry | |
dc.subject | Yenisey Ridge | |
dc.title | EVIDENCE FROM FE- AND AL-RICH METAPELITES FOR THRUST LOADING IN THE TRANSANGARIAN REGION OF THE YENISEY RIDGE, EASTERN SIBERIA | |
dc.type | Статья |
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