Results 121 to 130 of about 14,263 (225)

Six Ca‐Mg‐Fe Carbonate Reference Materials for In Situ Measurement of Oxygen and Carbon Isotope Ratios

Geostandards and Geoanalytical Research, Volume 50, Issue 1, Page 155-179, March 2026.
Key Points Six new Ca‐Mg‐Fe carbonate reference materials are available to the global geochemical community for calibrating oxygen and carbon isotope ratios by SIMS. Significant compositional matrix effects were observed in the dolomite‐ankerite and magnesite‐siderite series during SIMS analysis. Compositional matrix effects correlate with Fe variation.
Maria Rosa Scicchitano, Chris Harris, Julie Luyt, Andreas Pack, Tommaso di Rocco, Torsten Vennemann, Franziska D.H. Wilke, Anja M. Schleicher, Johannes Glodny, Kimberly T. Tait, Simon Philippo   +10 more
wiley   +1 more source

Primary and Secondary Grzybowski’s Generalized Eruptive Keratoacanthoma: A New Perspective on Management, Clinical Features, and Prognosis

International Journal of Dermatology, Volume 65, Issue 3, Page 456-463, March 2026.
ABSTRACT Grzybowski's generalized eruptive keratoacanthoma (GEKA) is a rare variant of keratoacanthomas, characterized by hundreds to thousands of lesions, accompanied by pruritus, mucosal involvement, and comorbidities. Our aim was to analyze the clinical presentation, associated comorbidities, treatment strategies, and outcomes of GEKA.
Nicholas Florin Kormos, Carina Maria Petrenciu, Alin Stefan Vizitiu, Raluca Ghețe, Umer Nadir, Adrian Lucian Baican, Stanislav N. Tolkachjov   +6 more
wiley   +1 more source

Voluminous lava flows at Oldoinyo Lengai in 2006: chronology of events and insights into the shallow magmatic system [PDF]

, 2008
BELTON, F, Ernst, Gerald, Jacobs, Patric, KELLER, J, Kervyn de Meerendre, Matthieu, KERVYN, F, KLAUDIUS, J, MATTSSON, HB, MBEDE, E   +8 more
core   +2 more sources

Apatite in Bennu samples indicates multiple stages of aqueous alteration

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 504-521, March 2026.
Abstract Calcium phosphates are ubiquitous in planetary materials, including samples returned from asteroid Bennu by the OSIRIS‐REx mission. We characterized apatite [Ca5(PO4)3(F,Cl,OH)] grains in Bennu samples by scanning electron microscopy, electron microprobe analysis, and transmission electron microscopy to investigate their compositions, mineral ...
Laura B. Seifert, T. M. Erickson, L. P. Keller, J. J. Barnes, K. Thomas‐Keprta, L. Le, J. Gorce, Z. Rahman, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta   +10 more
wiley   +1 more source

Shock metamorphic effects in Itokawa phosphates: A comparison with megaregolith‐derived meteorites

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 351-370, March 2026.
Abstract Returned regolith samples from the asteroid Itokawa provide a unique opportunity to compare shock metamorphic effects in unconsolidated regolith materials with those preserved in lithified meteorites, that is, megaregolith. We analyzed four Itokawa particles (Ueda—RA‐QD02‐0519, Narahara—RA‐QD02‐0573, Domon—RA‐QD02‐0588, Ishiuchi—RX‐MD03‐0212 ...
E. Dobrică, A. N. Krot, A. J. Brearley
wiley   +1 more source

Non-Newtonian ice rheology and the retention of craters on Ganymede [PDF]

Calculations carried out for craters of varying sizes in a medium with constant temperature T = 173 K yield values for the crater relaxation time t sub e (defined as the time required for the crater depth to become 1/e of its original value) that appear ...
Schubert, Gerald, Thomas, Paul J.
core   +1 more source

Pacing Early Mars Sedimentary Rock Formation

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Mars' sedimentary rock record documents past surface and/or near‐surface liquid water. However, paleoclimate models struggle to explain conditions warm enough for past liquid water. One hypothesis is transient warming by H2 ${\mathrm{H}}_{2}$‐CO2 ${\text{CO}}_{2}$ collision‐induced absorption (CIA) (H2 ${\mathrm{H}}_{2}$‐CO2 ${\text{CO}}_{2 ...
M. L. Turner, E. S. Kite
wiley   +1 more source

Meteoroid and debris special investigation group data acquisition procedures [PDF]

The entire LDEF spacecraft was examined by M&D SIG for impact (i.e., craters greater than or = 0.5 mm and penetrations greater than or = 0.3 mm in diameter) and related features (e.g., debris, secondaries).
Allbrooks, Martha K., Atkinson, Dale R., Sapp, Clyde A., See, Thomas H., Simon, Charles G., Zolensky, Mike E.   +5 more
core   +1 more source

Freeze‐Thaw Cycling Accelerated Olivine Weathering and Water Sequestration on Icy Mars

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Geological evidence and paleoclimate models suggest that freeze‐thaw (FT) cycling has played a pivotal role in shaping the Martian surface composition throughout geological time. Here we show the experimental investigation of the sulfuric acid weathering of olivine under simulated FT conditions (193–293 K).
Jing Liu, Jing Wang, Shouhao Tong, Mengqi Luo, Junming Zhou, Jiacheng Liu, Zhongchen Wu, Minwang Laipan, Runliang Zhu   +8 more
wiley   +1 more source

Floor-fractured crater models of the Sudbury structure, Canada [PDF]

The Sudbury structure in Ontario, Canada, is one of the oldest and largest impact structures recognized in the geological record. It is also one of the most extensively deformed and volcanically modified impact structures on Earth.
Schultz, P. H., Wichman, R. W.
core   +1 more source