Results 91 to 100 of about 42,838 (280)

Mineralogical and geochemical characterization of hydrated minerals from subterranean environments: implications for planetary exploration

, 2014
El reciente descubrimiento de minerales hidratados sobre la superficie de Marte sugiere la presencia de importantes cantidades de agua líquida durante algunas etapas de su historia geológica. A raíz de este hallazgo, los estudios sobre minerales hidratados en ambientes terrestres como potenciales análogos marcianos han adquirido gran relevancia.
F. Gázquez, F. Rull, J. M. Calaforra, G. Venegas, J. A. Manrique, A. Sanz, J. Medina, A. Catalá Espí, A. Sansano, R. Navarro, FORTI, PAOLO, DE WAELE, JO HILAIRE AGNES, J. Martínez Frías   +12 more
openaire   +2 more sources

Thermochemical stability of low-iron, manganese-enriched olivine in astrophysical environments [PDF]

, 2012
Low-iron, manganese-enriched (LIME) olivine grains are found in cometary samples returned by the Stardust mission from comet 81P/Wild 2. Similar grains are found in primitive meteoritic clasts and unequilibrated meteorite matrix.
Beckett, John R., Ebel, Denton S., Weisberg, Michael K.   +2 more
core   +1 more source

Fats, Fire and Bronze Age Funerary Rites: Organic Residue Analysis of Wide Horizontal Rim Vessels From Burial Contexts in Northwest Portugal

Archaeometry, EarlyView.
ABSTRACT This study presents the first GC‐MS–based analyses of wide horizontal rim vessels with well‐defined funerary contexts, from Middle Bronze Age Portugal (Quinta do Amorim 2 and Pego). Organic residues from two vessels revealed ruminant fats and plant oils, alongside molecular markers of heat exposure.
João Vinícius Back, César Oliveira, Ana M. S. Bettencourt, Hugo Aluai Sampaio, Luciano Vilas Boas, Luís Gonçalves   +5 more
wiley   +1 more source

D/H ratios of the inner Solar System [PDF]

, 2017
The original hydrogen isotope (D/H) ratios of different planetary bodies may indicate where each body formed in the Solar System. However, geological and atmospheric processes can alter these ratios through time.
Hallis, Lydia
core   +1 more source

Wet Season Carbon (δ13C) and Nitrogen (δ15N) Composition of Modern Plants as Isotopic Framework for Agropastoral and Palaeoecological Studies in Northern Greece

Archaeometry, EarlyView.
ABSTRACT Mediterranean wetlands are one of Europe's most vital and endangered biodiversity hotspots. This study determined the carbon (δ13C) and nitrogen (δ15N) isotope values of modern plants to construct an isotopic framework by which to contextualize agropastoral management in and around past wetland ecosystems.
Doris Vidas‐Cardador, Amy Styring, Michael Charles, Valasia Isaakidou, Paul Halstead, Amy Bogaard   +5 more
wiley   +1 more source

Spectral Evidence for Recent/Ongoing Activity in Mercury’s Praxiteles Basin

The Planetary Science Journal
Mercury’s surface, as revealed by the MESSENGER probe, lacks distinctive absorption features in the visible–near-infrared spectral range, except for hollows that display a 630 nm feature ascribed to sulfides.
Anna Galiano, Giovanni Munaretto, Deborah L. Domingue, Cristian Carli, Gianrico Filacchione, Valentina Galluzzi, Salvatore Buoninfante, David Rothery, Fabrizio Capaccioni, Mario D’Amore, Alessandro Maturilli, Sebastien Besse, Océane Barraud, Lauren Jozwiak, Antti Penttilä, Oleg Abramov   +15 more
doaj   +1 more source

Thermal history analysis of granitic rocks in an arc-trench system based on apatite fission-track thermochronology: A case study of the Northeast Japan Arc

Journal of Asian Earth Sciences: X, 2019
We applied apatite fission-track (AFT) thermochronometry to the Cretaceous-Paleogene granitic rocks across the southern part of the Northeast (NE) Japan Arc in order to elucidate the denudation history.
Shoma Fukuda, Shigeru Sueoka, Noriko Hasebe, Akihiro Tamura, Shoji Arai, Takahiro Tagami   +5 more
doaj   +1 more source

“Flames Over Persepolis”: New Scientific Evidence Supporting Historical Perspectives

Archaeometry, EarlyView.
ABSTRACT This study investigates the burning of Persepolis Terrace, historically attributed to Alexander III in 330 bce. A review of classical accounts and excavation reports, combined with diagnostic surveys, confirms the fire's historicity and provides novel insights.
Maria Letizia Amadori, Ileana De Giuseppe, Fabrizio Frontalini, Luca Pellegrino, Richard W. Jordan, Pierfrancesco Callieri, Emad Matin, Alireza Askari Chaverdi, Hamid Fadaei, Valeria Mengacci, Fulvio Fantino   +10 more
wiley   +1 more source

Imaging Spectroscopy: Earth and Planetary Remote Sensing with the PSI Tetracorder and Expert Systems from Rovers to EMIT and Beyond

The Planetary Science Journal
A system for rapid analysis of spectroscopy data with emphasis on planetary surfaces, both imaging and single-spectrum data, is described. The system, called Tetracorder, is commanded by an expert system developed by expert spectroscopists.
Roger N. Clark, Gregg A. Swayze, K. Eric Livo, Philip G. Brodrick, Eldar Noe Dobrea, Srinivasan Vijayarangan, Robert O. Green, David Wettergreen, Alberto Candela, Amanda Hendrix, Carlos Pérez García-Pando, Neil C. Pearson, Melissa D. Lane, Adolfo González-Romero, Xavier Querol, the EMIT and TREX teams   +15 more
doaj   +1 more source

Fecal Steroids as Tracers of Human Population and Waste Management Practices at the Ancient Maya City of Ucanal, Guatemala

Archaeometry, EarlyView.
ABSTRACT Geochemical data compiled from dried sediments from three water reservoirs at the ancient Maya city of Ucanal, Petén, Guatemala, reveal low to undetectable fecal biomarker concentrations. These low concentrations may be the result of the aerobic decay of sterols combined with well‐managed waste disposal practices.
Jean D. Tremblay, Peter M. J. Douglas, Christina T. Halperin, Yves Gélinas   +3 more
wiley   +1 more source