Wszystkie pola: Kangerlussuaq - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Mesoarchean melt and fluid inclusions in garnet from the Kangerlussuaq basement, Southeast Greenland
Autorzy:: Nicoli, Gautier
Gresky, Kerstin
Ferrero, Silvio
Powiązania:: https://bibliotekanauki.pl/articles/2086561.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mineralogiczne
Tematy:: melt inclusions
Precambrian
Greenland
Opis:: The present work reports the first anatectic melt inclusions found so far in the Mesoarchean basement in East Greenland. Using optical microscope observations and MicroRaman spectroscopy, we show that garnets in metasedimentary migmatite contain primary polycrystalline aggregates which can be confidently interpreted as former droplets of anatectic melt, i.e. nanogranitoids. In some cases, they coexist with coeval fluid inclusions under conditions of primary fluid-melt immiscibility. The re-evaluation of the metamorphic pressure and temperature conditions with up-to-date phase equilibria modelling, combined with the identification of nanogranitoids and fluid inclusions, suggests metamorphic peak equilibration and partial melting in presence of a COH-fluid at T ~1000°C and P > 7 kbar. To date, this is the oldest verified occurrence of nanogranitoids and fluid-melt immiscibility during garnet growth in a partially molten environment.
Źródło:: Mineralogia; 2022, 53, 1; 1--9
1899-8291
1899-8526
Pojawia się w:: Mineralogia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Physical oceanographic conditions and a sensitivity study on meltwater runoff in a West Greenland fjord: Kangerlussuaq
Autorzy:: Monteban, D.
Pedersen, J.O.P.
Nielsen, M.H.
Powiązania:: https://bibliotekanauki.pl/articles/2079080.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: melt water
hydrodynamic model
numerical model
seasonal variability
physical condition
water mass
Arctic fjord
West Greenland
Kangerlussuaq
Opis:: In this paper, we discuss the first setup of a hydrodynamic model for the fjord-type estuary Kangerlussuaq, located in West Greenland. Having such a high-fidelity numerical model is important because it allows us to fill in the temporal and spatial gaps left by in situ data and it allows us to examine the response of the fjord to changes in ice sheet runoff. The numerical model is calibrated against in situ data, and a one-year simulation was performed to study the seasonal variability in the physical oceanographic environment and the fjord's response to changing meltwater runoff. The fjord consists of two distinct parts: a deep inner part that is 80 km long with weak currents and a shallow part that covers the outer 100 km of the fjord connected to the ocean. The outer part has very fast currents (∼1.3 m/s), which we suggest prevents winter sea ice formation. The dominant currents in the fjord are oriented parallel to the long axis of the fjord and are driven by tides and (during summer) freshwater inflow from meltwater-fed rivers. Furthermore, mixing processes are characterized by strong tidal mixing and bathymetric restrictions, and the deep-lying water mass is subject to renewal primarily in wintertime and is almost dynamically decoupled from the open ocean during summertime. Finally, a sensitivity study on the changing meltwater runoff was performed, showing that increasing freshwater runoff considerably strengthens stratification in the upper 100 m of the water column in the inner part of the fjord.
Źródło:: Oceanologia; 2020, 62, 4PA; 460-477
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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