Results 101 to 110 of about 3,762 (245)

Gamma-Ray-Induced Amino Acid Formation during Aqueous Alteration in Small Bodies: The Effects of Compositions of Starting Solutions

Life
Organic compounds, such as amino acids, are essential for the origin of life, and they may have been delivered to the prebiotic Earth from extra-terrestrial sources, such as carbonaceous chondrites.
Akari Ishikawa, Yoko Kebukawa, Kensei Kobayashi, Isao Yoda   +3 more
doaj   +1 more source

Cometary micrometeorites and input of prebiotic compounds

BIO Web of Conferences, 2014
The apparition of life on the early Earth was probably favored by inputs of extraterrestrial matter brought by carbonaceous chondrite-like objects or cometary material. Interplanetary dust collected nowadays on Earth is related to carbonaceous chondrites
Engrand C.
doaj   +1 more source

SNOW COVER OF THE CENTRAL ANTARCTICA (VOSTOK STATION) AS AN IDEAL NATURAL TABLET FOR COSMIC DUST COLLECTION: PRELIMINARY RESULTS ON THE IDENTIFICATION OF MICROMETEORITES OF CARBONACEOUS CHONDRITE TYPE

Лëд и снег, 2015
During the 2010/11 season nearby the Vostok station the 56th Russian Antarctic Expedition has collected surface snow in a big amount from a 3 m deep pit using 15 220 L vol. containers (about 70 kg snow each).
E. S. Bulat, V. A. Celmovich, J.-R. Petit, I. M. Gindilis, S. A. Bulat   +4 more
doaj   +1 more source

Petrogenesis and Tectonic Evolution of Cenozoic Magmatism in the Southernmost Northern Andes: Insights From Zircon Petrochronology

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract This study integrates new zircon U–Pb ages, zircon εHf(t)–δ18O isotopic data, and whole‐rock geochemistry to refine the temporal and spatial framework of magmatism in the southern Northern Andes (SNA) from ∼65 to 6 Ma. The San Lucas, Catamayo, Portachuela, and Gonzanamá batholiths and magmatic suites, along with Late Miocene plutons, display ...
J. Iglesias, C. Witt, L. C. Sandoval Espinel, M. Zattin, M. Poujol, O. Bruguier, O. Poma, M. J. Hernández, O. Averbuch, M. Seyler, D. Bosch, F. Chanier, S. Ventalon, C. Liorzou, V. Bosse   +14 more
wiley   +1 more source

Dhofar 225 and Dhofar 735: Relationship to CM2 chondrites and metamorphosed carbonaceous chondrites, Belgica-7904 and Yamato-86720 [PDF]

, 2010
Dhofar (Dho) 225 and Dho 735 are carbonaceous chondrites found in a hot desert and having affinities to Belgica-like Antarctic chondrites (Belgica [B-] 7904 and Yamato [Y-] 86720).
Clayton, Robert N., Franz BRANDSTAETTER, Nazarov, M.A., Ian A. FRANCHI, Bychkov, A.Yu., Lorenz, C.A., Ivanova, M.A., Robert N. CLAYTON, Clayton, R.N., Lorenz, Cyrill A., Lyuba V. MOROZ, Franchi, I., Cyrill A. LORENZ, Nazarov, Mikhail A., Mikhail A. NAZAROV, Andrew Yu. BYCHKOV, Brandstätter, F., Bychkov, Andrew Yu, Moroz, Lyuba V., Moroz, L.V., Ivanova, Marina A., Brandstaetter, Franz, Franchi, Ian A., Marina A. IVANOVA   +23 more
core   +1 more source

Climate conditions on the South‐Iberian Palaeomargin during the latest Pliensbachian to early Toarcian: A mineralogical and geochemical study from hemipelagic deposits

Sedimentology, Volume 73, Issue 5, Page 1631-1663, August 2026.
ABSTRACT The integrated analysis of lithofacies, mineralogy and geochemistry of the hemipelagic marine succession exposed in La Cerradura section (South‐Iberian Palaeomargin) provides new information to characterise the palaeoenvironmental conditions during the latest Pliensbachian to early Toarcian, including the Jenkyns Event.
Chaima Ayadi, Isabel Abad, Elisa Laita, Ali Mokhtar Samet, Matías Reolid   +4 more
wiley   +1 more source

New analyses of Antarctic carbonaceous chondrites [PDF]

, 1981
P(論文)New analyses have been made on the Antarctic carbonaceous chondrites ALHA77306 and ALHA77307. Only traces of amino acids have been detected in ALHA77307. Non-protein amino acids were not detected.
Ma, Maw-Suen, Pizzarello, Sandra, Moore, Carleton B., Cronin, John R., Schmitt, Roman A.   +4 more
core   +1 more source

Evaluating the Effects of Thermal Processing on Nucleosynthetic Zinc Isotope Variations: Insights from Carbonaceous Chondrites Leachates

The Astrophysical Journal
Variations in the nucleosynthetic isotope compositions of meteorites have been suggested to result from variable destruction of some presolar grains through thermal processing.
Rayssa Martins, Elin M. Morton, Alessandro Bragagni, Helen M. Williams, Frank Wombacher, Mark Rehkämper   +5 more
doaj   +1 more source

Life on Mars? The physiological perspective

Experimental Physiology, EarlyView.
Ronan M. G. Berg, Damian M. Bailey
wiley   +1 more source

Linking the Tectonic Evolution of Hainan Island and Borneo Since the Paleozoic: Implication for Interaction Between the Tethyan and Paleo‐Pacific Tectonic Domains in Southeast Asia

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract The interaction between the Tethyan and Paleo‐Pacific subduction systems in Southeast Asia since the Paleozoic is still poorly understood. Hainan Island and Borneo, located near the junction of the Tethyan and Paleo‐Pacific domains, provide the critical regions for understanding the dynamic processes and interaction between the two tectonic ...
Yang Zhou, Pingping Li, Shan Li, Andrew Carter, Jonny Wu, Yi Yan, Yongjian Yao, Wei Liu, Lin Wang, Junzhi Liu, Khor Weichung, Rongwei Zhu, Zuofei Zhu, Qi Zhao, Qingsong Liu   +14 more
wiley   +1 more source