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215 results on '"Ando', Sergio"'

4. Indigo-dyed cellulose fibers and synthetic polymers in surface-feeding seabird chick regurgitates from the Gulf of Alaska

Author

Tremolada, Paolo, Saliu, Francesco, Winkler, Anna, Carniti, Cecilia P., Castelli, Melisa, Lasagni, Marina, Andò, Sergio, Leandri-Breton, Don-Jean, Gatt, Marie Claire, Obiol, Joan Ferrer, Parolini, Marco, Nakajima, Chinatsu, Whelan, Shannon, Shoji, Akiko, Hatch, Scott A., Elliott, Kyle H., Cecere, Jacopo G., and Rubolini, Diego

Published
2024
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11. Large-scale mass wasting on the Miocene continental margin of western India

Author

Dailey, Sarah K, Clift, Peter D, Kulhanek, Denise K, Blusztajn, Jerzy, Routledge, Claire M, Calves, Gerome, O'Sullivan, Paul, Jonell, Tara N, Pandey, Dhananjai K, Ando, Sergio, Coletti, Giovanni, Zhou, Peng, Li, Yuting, Neubeck, Nikki E, Bendle, James AP, Aharonovich, Sophia, Griffith, Elizabeth M, Gurumurthy, Gundiga P, Hahn, Annette, Iwai, Masao, Khim, Boo-Keun, Kumar, Anil, Kumar, A Ganesh, Liddy, Hannah M, Lu, Huayu, Lyle, Mitchell W, Mishra, Ravi, Radhakrishna, Tallavajhala, Saraswat, Rajeev, Saxena, Rakesh, Scardia, Giancarlo, Sharma, Girish K, Singh, Arun D, Steinke, Stephan, Suzuki, Kenta, Tauxe, Lisa, Tiwari, Manish, Xu, Zhaokai, and Yu, Zhaojie

Subjects
Geology, Geochemistry, Geophysics
Abstract

Abstract A giant mass-transport complex was recently discovered in the eastern Arabian Sea, exceeding in volume all but one other known complex on passive margins worldwide. The complex, named the Nataraja Slide, was drilled by International Ocean Discovery Program (IODP) Expedition 355 in two locations where it is ∼300 m (Site U1456) and ∼200 m thick (Site U1457). The top of this mass-transport complex is defined by the presence of both reworked microfossil assemblages and deformation structures, such as folding and faulting. The deposit consists of two main phases of mass wasting, each consisting of smaller pulses, with generally fining-upward cycles, all emplaced just prior to 10.8 Ma based on biostratigraphy. The base of the deposit at each site is composed largely of matrix-supported carbonate breccia that is interpreted as the product of debris-flows. In the first phase, these breccias alternate with well-sorted calcarenites deposited from a high-energy current, coherent limestone blocks that are derived directly from the Indian continental margin, and a few clastic mudstone beds. In the second phase, at the top of the deposit, muddy turbidites dominate and become increasingly more siliciclastic. At Site U1456, where both phases are seen, a 20-m section of hemipelagic mudstone is present, overlain by a ∼40-m-thick section of calcarenite and slumped interbedded mud and siltstone. Bulk sediment geochemistry, heavy-mineral analysis, clay mineralogy, isotope geochemistry, and detrital zircon U-Pb ages constrain the provenance of the clastic, muddy material to being reworked, Indus-derived sediment, with input from western Indian rivers (e.g., Narmada and Tapti rivers), and some material from the Deccan Traps. The carbonate blocks found within the breccias are shallow-water limestones from the outer western Indian continental shelf, which was oversteepened from enhanced clastic sediment delivery during the mid-Miocene. The final emplacement of the material was likely related to seismicity as there are modern intraplate earthquakes close to the source of the slide. Although we hypothesize that this area is at low risk for future mass wasting events, it should be noted that other oversteepened continental margins around the world could be at risk for mass failure as large as the Nataraja Slide.

Published
2020

14. Comparability of heavy mineral data – The first interlaboratory round robin test

Author

Dunkl, István, von Eynatten, Hilmar, Andò, Sergio, Lünsdorf, Keno, Morton, Andrew, Alexander, Bruce, Aradi, László, Augustsson, Carita, Bahlburg, Heinrich, Barbarano, Marta, Benedictus, Aukje, Berndt, Jasper, Bitz, Irene, Boekhout, Flora, Breitfeld, Tim, Cascalho, João, Costa, Pedro J.M., Ekwenye, Ogechi, Fehér, Kristóf, Flores-Aqueveque, Valentina, Führing, Philipp, Giannini, Paulo, Goetz, Walter, Guedes, Carlos, Gyurica, György, Hennig-Breitfeld, Juliane, Hülscher, Julian, Jafarzadeh, Mahdi, Jagodziński, Robert, Józsa, Sándor, Kelemen, Péter, Keulen, Nynke, Kovacic, Marijan, Liebermann, Christof, Limonta, Mara, Lužar-Oberiter, Borna, Markovic, Frane, Melcher, Frank, Miklós, Dóra Georgina, Moghalu, Ogechukwu, Mounteney, Ian, Nascimento, Daniel, Novaković, Tea, Obbágy, Gabriella, Oehlke, Mathias, Omma, Jenny, Onuk, Peter, Passchier, Sandra, Pfaff, Katharina, Lincoñir, Luisa Pinto, Power, Matthew, Razum, Ivan, Resentini, Alberto, Sági, Tamás, Salata, Dorota, Salgueiro, Rute, Schönig, Jan, Sitnikova, Maria, Sternal, Beata, Szakmány, György, Szokaluk, Monika, Thamó-Bozsó, Edit, Tóth, Ágoston, Tremblay, Jonathan, Verhaegen, Jasper, Villaseñor, Tania, Wagreich, Michael, Wolf, Anna, and Yoshida, Kohki

Published
2020
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28. Geosites in the Gole della Breggia Geopark, Ticino, Southern Switzerland

Author

Oppizzi, P, Pasquaré Mariotto, F, Stockar, R, Stella, A, Corti, N, Pedicini, M, Ando', S, Vezzoli, G, Bonali, F, Oppizzi, Paolo, Pasquaré Mariotto, Federico, Stockar, Rudolf, Stella, Andrea, Corti, Noemi, Pedicini, Martina, Ando', Sergio, Vezzoli, Giovanni, Bonali, Fabio Luca, Oppizzi, P, Pasquaré Mariotto, F, Stockar, R, Stella, A, Corti, N, Pedicini, M, Ando', S, Vezzoli, G, Bonali, F, Oppizzi, Paolo, Pasquaré Mariotto, Federico, Stockar, Rudolf, Stella, Andrea, Corti, Noemi, Pedicini, Martina, Ando', Sergio, Vezzoli, Giovanni, and Bonali, Fabio Luca

Abstract

This work is aimed at illustrating one of the most engaging geoparks in Europe, the Gole della Breggia Geopark. By following its geotrail, the visitors can observe a great deal of features that encompass a wide variety of sedimentary, stratigraphic, tectonic and paleogeographic processes. Its contents are popularized by a comprehensive geotrail that encompasses 23 geostops, enriched with explanatory panels, which enable viewers to gain an overall picture of the complex processes that led to the present-day configuration of the outcrops encountered in the geopark. We have selected five significative outcrops, which we have regarded as fully-fledged geosites, and which encompass the whole 170-million-year interval, from Early Jurassic to Late Miocene times, during which the rocks of the geopark were deposited and deformed. We have performed an assessment of the five geosites, using the most common criteria that can be applied for geosite evaluation. The results of the assessment show that the most valuable geosites are the Lombardian Maiolica, and the Limestone with Pelagic Bivalves. All five geosites, thanks to a QR code added to each figure along the text, can be viewed as virtual geosites (VGs), integrated by 360° videos.

Published
2023

29. Characterization of pyrite weathering products by Raman hyperspectral imaging and chemometrics techniques

Author

Muñoz, E, Gosetti, F, Ballabio, D, Ando, S, Gómez-Laserna, O, Amigo, J, Garzanti, E, Muñoz, Enmanuel Cruz, Gosetti, Fabio, Ballabio, Davide, Ando, Sergio, Gómez-Laserna, Olivia, Amigo, Jose Manuel, Garzanti, Eduardo, Muñoz, E, Gosetti, F, Ballabio, D, Ando, S, Gómez-Laserna, O, Amigo, J, Garzanti, E, Muñoz, Enmanuel Cruz, Gosetti, Fabio, Ballabio, Davide, Ando, Sergio, Gómez-Laserna, Olivia, Amigo, Jose Manuel, and Garzanti, Eduardo

Abstract

In this study, we propose a new approach based on Raman hyperspectral imaging and chemometrics for the analysis of chemically heterogeneous surfaces of weathered minerals. A pyrite sample showing a heterogeneous surface with different alteration products, is used to test the validity of the technique. Principal Component Analysis (PCA) was initially used to evaluate data structure and identify Raman phases and vibrational modes related to minor and major weathering features. Afterwards, Multivariate Curve Resolution-alternating least squares (MCR-ALS) was carried out to identify the specific chemical components of the major weathering phases. Finally, for the analysis of the minor weathering phases, K-means clustering was carried out to identify groups of similar pixels of low percentage of variance in the image. Three major components are found in the analyzed sample, corresponding to pyrite and hematite vibrational modes, as well as features of an amorphous alteration product patina. Four additional spectral signatures revealing the presence of sulfates were found after the analysis of minor components. The proposed method enables a semi-quantitative threshold-based characterization of chemical features and provides a visual representation of the phase distribution on the surface of the sample.

Published
2023

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