☆ 4.3 Article

Manganese incorporation in synthetic hercynite

MINERALOGICAL MAGAZINE (2015)

Journal

MINERALOGICAL MAGAZINE

Volume 79, Issue 3, Pages 635-647

Publisher

MINERALOGICAL SOC

DOI: 10.1180/minmag.2015.079.3.09

Keywords

hercynite; spinel; manganese; oxygen fugacity; disorder; crystal chemistry

Categories

Mineralogy

Funding

Italian Ministry of Education, MIUR [2010EARRRZ_003]

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Abstract

Manganese incorporation in synthetic hercynite, and partitioning between hercynite and silicate melt synthesized at 1.0 GPa, 1250 degrees C, and at an f(O2) buffered by Fe-FeO, has been studied by X-ray absorption spectroscopy and single-crystal X-ray structure refinement. Spectra indicate the presence of both Mn2+ and Mn3+ (and possibly also Mn4+) in synthetic hercynite and partitioning of Mn2+ into the melt phase, and Mn3+ into hercynite, respectively, under run conditions. X-ray refinement is consistent with partial disorder of Fe and Al across tetrahedral and octahedral sites. A higher than expected degree of Fe-Al disorder in the Mn-bearing hercynite can be explained by preferential incorporation of Mn2+ onto the tetrahedral site, and indicates that Fe-Al disorder in pure, stoichiometric hercynite cannot necessarily be used to determine closure temperatures in natural spinel. However, partitioning of Mn2+ and Mn3+ between melt and hercynite suggests that Mn incorporation in hercynite could be used as a measure of f(O2) conditions in magmas during spinel crystallization.

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Wilsdorf-Kohler, A. Eberle, S. Luttmann, I Lohden, A. L. Nennecke, J. Kieschke, E. Sirri, C. Justenhoven, F. Reinwald, B. Holleczek, N. Eisemann, A. Katalinic, R. A. Asquez, V Kumar, E. Petridou, E. J. Olafsdottir, L. Tryggvadottir, D. E. Murray, P. M. Walsh, H. Sundseth, M. Harney, G. Mazzoleni, F. Vittadello, E. Coviello, F. Cuccaro, R. Galasso, G. Sampietro, A. Giacomin, M. Magoni, A. Ardizzone, A. D'Argenzio, A. A. Di Prima, A. Ippolito, A. M. Lavecchia, A. Sutera Sardo, G. Gola, P. Ballotari, E. Giacomazzi, S. Ferretti, L. Dal Maso, D. Serraino, M. Celesia, R. A. Filiberti, F. Pannozzo, A. Melcarne, F. Quarta, A. Andreano, A. G. Russo, G. Carrozzi, C. Cirilli, L. Cavalieri d'Oro, M. Rognoni, M. Fusco, M. F. Vitale, M. Usala, R. Cusimano, W. Mazzucco, M. Michiara, P. Sgargi, L. Boschetti, S. Marguati, G. Chiaranda, P. Seghini, M. M. Maule, F. Merletti, E. Spata, R. Tumino, P. Mancuso, T. Cassetti, R. Sassatelli, F. Falcini, S. Giorgetti, A. L. Caiazzo, R. Cavallo, D. Piras, F. Bella, A. Madeddu, A. C. Fanetti, S. Maspero, S. Carone, A. Mincuzzi, G. Candela, T. Scuderi, M. A. Gentilini, R. Rizzello, S. Rosso, A. Caldarella, T. Intrieri, F. Bianconi, P. Contiero, G. Tagliabue, M. Rugge, M. Zorzi, S. Beggiato, A. Brustolin, G. Gatta, R. De Angelis, M. Vicentini, R. Zanetti, F. Stracci, A. Maurina, M. Oniscuka, M. Mousavi, L. Steponaviciene, I Vincerzevskiene, M. J. Azzopardi, N. Calleja, S. Siesling, O. Visser, T. B. Johannesen, S. Laronningen, M. Trojanowski, P. Macek, T. Mierzwa, J. Rachtan, A. Rosinska, K. Kepska, B. Koscianska, K. Barna, U. Sulkowska, T. Gebauer, J. B. Lapinska, J. Wojcik-Tomaszewska, M. Motnyk, A. Patro, A. Gos, K. Sikorska, M. Bielska-Lasota, J. A. Didkowska, U. Wojciechowska, G. Forjaz de Lacerda, R. A. Rego, B. Carrito, A. Pais, M. J. Bento, J. Rodrigues, A. Lourenco, A. Mayer-da-Silva, D. Coza, A. Todescu, M. Y. Valkov, L. Gusenkova, O. Lazarevich, O. Prudnikova, D. M. Vjushkov, A. Egorova, A. Orlov, L. Pikalova, L. D. Zhuikova, J. Adamcik, C. Safaei Diba, V Zadnik, T. Zagar, M. De-La-Cruz, A. Lopez-de-Munain, A. Aleman, D. Rojas, R. J. Chillaron, A. I. M. Navarro, R. Marcos-Gragera, M. Puigdemont, M. Rodriguez-Barranco, M. J. Sanchez Perez, P. Franch Sureda, M. Ramos Montserrat, M. D. Chirlaque Lopez, A. Sanchez Gil, E. Ardanaz, M. Guevara, A. Canete-Nieto, R. Peris-Bonet, M. Carulla, J. Galceran, F. Almela, C. Sabater, S. Khan, D. Pettersson, P. Dickman, K. Staehelin, B. Struchen, C. Egger Hayoz, E. Rapiti, R. Schaffar, P. Went, S. M. Mousavi, J-l Bulliard, M. Maspoli-Conconi, C. E. Kuehni, S. M. Redmond, A. Bordoni, L. Ortelli, A. Chiolero, I Konzelmann, S. Rohrmann, M. Wanner, J. Broggio, J. Rashbass, C. Stiller, D. Fitzpatrick, A. Gavin, D. S. Morrison, C. S. Thomson, G. Greene, D. W. Huws, M. Grayson, H. Rawcliffe, C. Allemani, M. P. Coleman, V Di Carlo, F. Girardi, M. Matz, P. Minicozzi, N. Sanz, N. Ssenyonga, D. James, R. Stephens, E. Chalker, M. Smith, J. Gugusheff, H. You, S. Qin Li, S. Dugdale, J. Moore, S. Philpot, R. Pfeiffer, H. Thomas, B. Silva Ragaini, A. J. Venn, S. M. Evans, L. Te Marvelde, V Savietto, R. Trevithick, J. Aitken, D. Currow, C. Fowler, C. Lewis

Summary: This study provides a comprehensive examination of worldwide variation and trends in survival from brain tumors in adults by analyzing individual data from 2000 to 2014. The results show significant regional differences and temporal changes in survival rates, especially for the most common sub-types, with remarkable improvements since 2005 due to the uptake of chemoradiation. However, there are still some countries that lag behind in terms of survival rates.

NEURO-ONCOLOGY (2023)

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Article Environmental Sciences

Fungal diversity in lake and sea beaches of Italy: Relevance to human health br

Anna Prigitano, Laura Trovato, Maria Carmela Esposto, Joao Brandao, Massimo Cogliati, Giacomo Diego Gatta, Anna Grancini, Giuseppe Migliorisi, Salvatore Oliveri, Luisa Romano, Susana Silva, Anna Maria Tortorano

Summary: This study investigates the fungal population in beach sands of the two largest Italian lakes and in sands and waters of Mediterranean coasts of Southern Italy to understand the causes of microbiological pollution and its impact on bathers' health. The study reveals significant differences in fungal population between the lakes and coastal areas. The prevalence of opportunistic pathogenic moulds, such as Aspergillus spp. and Penicillium spp., is observed in freshwater and coastal bathing sites.

SCIENCE OF THE TOTAL ENVIRONMENT (2023)

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Article Astronomy & Astrophysics

The Geochemical Legacy of Low-Temperature, Percolation-Driven Core Formation in Planetesimals

Geoffrey David Bromiley

Summary: Mechanisms for core formation in differentiated bodies in the early solar system are not well understood. Core formation at low temperatures could have occurred through the percolation of metallic liquids, but its contribution to fully-differentiated bodies is uncertain. This study explores the effects of low-temperature core formation on the elemental composition of planetesimal cores and mantles. The results show that the segregation of Fe-rich and FeS-rich liquids is influenced by pressure and oxygen fugacity, affecting the light element content of cores. However, the partitioning of trace elements between FeS-rich and Fe-rich phases remains unclear, and the conditions under which metallic liquid segregation occurred also played a significant role in planetesimal composition.

EARTH MOON AND PLANETS (2023)

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Article Instruments & Instrumentation

Graphite resistive heated diamond anvil cell for simultaneous high-pressure and high-temperature diffraction experiments

Huijeong Hwang, Yoonah Bang, Jinhyuk Choi, Hyunchae Cynn, Zsolt Jenei, William J. Evans, Anita Ehnes, Iris Schwark, Konstantin Glazyrin, G. Diego Gatta, Paolo Lotti, Chrystele Sanloup, Yongjae Lee, Hanns-Peter Liermann

Summary: We have developed a graphite resistive heated diamond anvil cell (GRHDAC) for powder and single-crystal x-ray diffraction experiments at the Extreme Conditions Beamline (P02.2) at PETRA III, Hamburg, Germany. The GRHDAC can heat samples homogeneously and precisely control the temperature up to 2000 K at high pressures, by placing it in a water-cooled vacuum chamber. The advantage of the GRHDAC is demonstrated through the study of geophysical processes in the Earth's crust and upper mantle region.

REVIEW OF SCIENTIFIC INSTRUMENTS (2023)

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