Results 61 to 70 of about 424,190 (218)

New Constraints on the Onset of Antarctic Glaciation From Combined Radiogenic Hafnium and Neodymium Isotopes

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract The drawdown of atmospheric CO2 likely triggered Antarctic glaciation during the Eocene‐Oligocene Transition (34 Ma). Accurately constraining this shift from “greenhouse” to an “icehouse” climate is essential for understanding global carbon cycle dynamics.
Keehwan Lee, Franco Marcantonio, Michael Bizimis, Howie D. Scher, Brian W. Romans, Lucien Nana Yobo   +5 more
wiley   +1 more source

Two faces of L-type asteroids

Astronomy & Astrophysics
Context. L-types are a rare class of asteroids whose spectra indicate similarities with CO and CV chondrites, suggesting high abundances of refractory inclusions, particularly with respect to the calcium-aluminium-rich inclusion.
Mahlke M., Marsset M., Devogèle M., Baklouti D., Beck P., Bonal L., Brunetto R., Lantz C., Tanga P.   +8 more
doaj   +1 more source

EVOLUTION OF COMET-LIKE ORBITS OF METEORITE- PRODUCING GROUPS AND THEIR PARENT BODIES

Odessa Astronomical Publications, 2019
This paper presents the results of the study of evolution of Jupiter-family comet-like orbits of six meteorite-producing groups, including sporadic fireballs from the IAU MDC database 2007 [1], sporadic meteors from the SonataCo database [2 ...
N. A. Konovalova, Yu. M. Gorbanev, N. H. Davruqov   +2 more
doaj   +1 more source

Underestimation of Planetary Contraction Due To Obscuration by Surface Roughness: The Case of Mercury

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract Estimating Mercury's radial contraction is key to understanding the planet's geodynamic evolution. Contraction has been inferred from mapped shortening structures, whose heterogeneous distribution contradicts the isotropic contraction expected from global cooling.
G. Nishiyama, A. Broquet, N. Tosi, F. Preusker, A. Stark, H. Hussmann, E. Hauber   +6 more
wiley   +1 more source

Structural Characteristics of Troilite from Ordinary Chondrites of Different Types [PDF]

, 2022
The structural parameters of troilite from ordinary chondrites of different types were in ...
Наухацкий, И. А., Dyundik, S. S., Петрова, Е. В., Nauhatsky, I. A., Максимова, Е. М., Maksimova, E. M., Дюндик, С. С., Petrova, E. V.   +7 more
core  

Sorting and recycling processes of early inner Solar System materials

Astronomy & Astrophysics
Context. Within pristine chondrites, chondrules and a fine-grained matrix are the dominant components; however, their genetic relationship remains unresolved.
Xiang Jinwei, Neumann Wladimir, Li Ye, Jin Lei, Zhu Yanlin, Jin Ziliang   +5 more
doaj   +1 more source

Sedimentology and geochemistry of the recent sediments of the river system on Hurd Peninsula, Livingston Island, Antarctica

The Depositional Record, Volume 12, Issue 4, September 2026.
This study investigates the sedimentology and geochemistry of recent sediments from ephemeral river systems on Hurd Peninsula, Livingston Island, Antarctica. These systems are important for understanding sedimentary and geochemical processes in unique polar environments.
Yakup Çelik, Merve Özyurt, Raif Kandemir   +2 more
wiley   +1 more source

SiO2-rich condrules in ordinary chondrites [PDF]

, 1982
The solar system abundances of Mg, Fe, and Si dictate that chondritic meteorites are silica-deficient compared to most terrestrial or lunar igneous rocks; thus olivine-orthopyroxene assemblages are commonly observed in ordinary chondrites.
Burnett, D. S., Brigham, Cheryl, Murrell, M. T.   +2 more
core  

Oxygen isotope systematics of chondrules in Rumuruti chondrites: Formation conditions and genetic link with ordinary chondrites

, 2022
International audienceRumurutiites (R chondrites) are rare, highly oxidized chondrites belonging to the noncarbonaceous superclan and characterized by low chondrule abundances.
Batanova, Valentina, Yves Marrocchi, Johan Villeneuve, Valentina Batanova, Maxence Regnault, Emmanuel Jacquet, Schnuriger, Nicolas, Piralla, Maxime, Villeneuve, Johan, Marrocchi, Yves, Jacquet, Emmanuel, Nicolas Schnuriger, Maxime Piralla, Regnault, Maxence   +13 more
core   +1 more source

Detrital zircon ages, Lu‐Hf isotopes of zircon grains, Sr‐Nd isotopes on whole rock and geochemistry of Campanian turbidites in the Eastern Pontides (NE Türkiye): A provenance assessment and Gondwana records

The Depositional Record, Volume 12, Issue 4, September 2026.
These findings confirm that the Campanian‐aged Bozbent Member turbiditic sequence in the Eastern Pontides was deposited in an extensional fore‐arc basin and therefore exhibits the petrographic and geochemical characteristics of passive margin sandstones.
Çiğdem Saydam Eker, Cem Yücel, Abdullah Kaygusuz, Emre Aydınçakır, Youn‐Joong Jeong, Sinan Yılmazer, Kadir Sünnetçi   +6 more
wiley   +1 more source