Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Raúl O.C. Fonseca"'
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 86, Iss 4, Pp 1609-1629 (2014)
Subduction zone or arc magmas are known to display a characteristic depletion of High Field Strength Elements (HFSE) relative to other similarly incompatible elements, which can be attributed to the presence of the accessory mineral rutile (TiO2) in
Externí odkaz:
https://doaj.org/article/8b30a1289e744490946726749df147d6
Autor:
Carsten Münker, Marian Janák, Irena Miladinova, Raúl O.C. Fonseca, Thorsten J. Nagel, Peter Sprung, Nikolaus Froitzheim
Publikováno v:
Miladinova, I, Froitzheim, N, Nagel, T J, Janák, M, Fonseca, R O C, Sprung, P & Münker, C 2022, ' Constraining the process of intracontinental subduction in the Austroalpine Nappes : Implications from petrology and Lu-Hf geochronology of eclogites ', Journal of Metamorphic Geology, vol. 40, no. 3, pp. 423-456 . https://doi.org/10.1111/jmg.12634
High- and ultrahigh-pressure rocks occur in the Austroalpine Nappes in a ~400 km long belt from the Texel Complex in the west to the Sieggraben Unit in the east. Garnet growth during pressure increase was dated using Lu-Hf chronometry. The results ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e30c7eb6af03471c6a2c166066d5ed6
https://doi.org/10.1111/jmg.12634
https://doi.org/10.1111/jmg.12634
Publikováno v:
Magma Redox Geochemistry
Elements with variable valence state (i.e. redox-sensitive) often show contrasting mineral/melt partition coefficients as a function of oxygen fugacity (fO2) in magmatic systems. This is because tr...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::932cfd785a98681d52950da06377aff2
https://doi.org/10.1002/9781119473206.ch17
https://doi.org/10.1002/9781119473206.ch17
Autor:
Chris Ballhaus, Richard Wirth, Hassan M. Helmy, Raúl O.C. Fonseca, Niels Jöns, Anja Schreiber
Publikováno v:
American Mineralogist
Several recent papers have purported to find ultra-reduced minerals—as natural examples—within ophiolitic mantle sections, including SiC moissanite, Fe-Si alloys, various metal carbides, nitrides, and borides. All those phases were interpreted to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c68a9ae4795c1c743d47095bada9cf4
https://doi.org/10.2138/am-2021-7612
https://doi.org/10.2138/am-2021-7612
Publikováno v:
Journal of radioanalytical and nuclear chemistry 325(2), 357-363 (2020). doi:10.1007/s10967-020-07267-6
The aim of this study is the development of a separation technique for geological samples, namely bismuthinites, with the goal to isolate Tl from excess amounts of Bi. This will enable an isotopic measurement of the Tl content on the ultra-trace leve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5406224b13cb3d463b81a927d99e0047
https://doi.org/10.1007/s10967-020-07267-6
https://doi.org/10.1007/s10967-020-07267-6
Autor:
Vinciane Debaille, Felipe Padilha Leitzke, Jonas Tusch, Peter Sprung, Carsten Münker, Raúl O.C. Fonseca, Mario Fischer-Gödde, Maxwell Thiemens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e2ec2023c48663114c20381a6197f34
https://hdl.handle.net/20.500.14017/1b12ce1d-7642-4d7d-b24d-7d6eade62c5e
https://hdl.handle.net/20.500.14017/1b12ce1d-7642-4d7d-b24d-7d6eade62c5e
Publikováno v:
European Journal of Mineralogy, Vol 33, Pp 373-387 (2021)
An electrum–quartz pebble with a weight of 10.4 g was discovered in a cliff of Saalian glaciogenic sediments on the west coast of the German North Sea island of Sylt in 2012. It has a roundish water-worn appearance and consists of intergrown electr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d2ebdaf00b2b5b6118f32aa3eb37b2b
https://ejm.copernicus.org/articles/33/373/2021/
https://ejm.copernicus.org/articles/33/373/2021/
Publikováno v:
Nature Geoscience
The date of the Moon-forming impact places an important constraint on Earth’s origin. Lunar age estimates range from about 30 Myr to 200 Myr after Solar System formation. Central to this age debate is the greater abundance of 182W inferred for the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69964a346ba9b1031a663a882d5efa47
https://doi.org/10.1038/s41561-019-0398-3
https://doi.org/10.1038/s41561-019-0398-3
Autor:
Raúl O.C. Fonseca, Carsten Münker, Irena Miladinova, Matthias Hauke, Peter Sprung, Thorsten J. Nagel, Kathrin Fassmer, Nikolaus Froitzheim
Publikováno v:
Hauke, M, Froitzheim, N, Nagel, T J, Miladinova, I, Fassmer, K, Fonseca, R O C, Sprung, P & Münker, C 2019, ' Two high-pressure metamorphic events, variscan and alpine, dated by Lu–Hf in an eclogite complex of the Austroalpine nappes (Schobergruppe, Austria) ', International Journal of Earth Sciences, vol. 108, no. 4, pp. 1317-1331 . https://doi.org/10.1007/s00531-019-01708-8
The Eo-Alpine high-pressure belt in the Austroalpine nappes consists of pre-Mesozoic basement rocks overprinted by eclogite-facies metamorphism during the Late Cretaceous. Parts of this basement were already eclogitized during the Variscan orogeny. L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89a54a219f3d17571b2fadc202fa78ec
https://doi.org/10.1007/s00531-019-01708-8
https://doi.org/10.1007/s00531-019-01708-8
Autor:
Raúl O.C. Fonseca, Sebastian Kommescher, Felipe Padilha Leitzke, Peter Sprung, Laura Jennifer Anabel Rzehak, Florian Kurzweil
Publikováno v:
Contributions to Mineralogy and Petrology. 176
Equilibria between Ti oxides and silicate melt lead to Ti isotope fractionation in terrestrial samples, with isotopically light Ti oxides and isotopically heavy coexisting melt. However, while Ti is mostly tetravalent in terrestrial samples, around 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::56fc2460a946e19734046649982b948c
https://doi.org/10.1007/s00410-020-01769-y
https://doi.org/10.1007/s00410-020-01769-y