Results 51 to 60 of about 11,238 (241)

Clays and the Origin of Life: The Experiments

Life, 2022
There are three groups of scientists dominating the search for the origin of life: the organic chemists (the Soup), the molecular biologists (RNA world), and the inorganic chemists (metabolism and transient-state metal ions), all of which have ...
Jacob Teunis (Theo) Kloprogge, Hyman Hartman   +1 more
doaj   +1 more source

Petrogenesis and Tectonic Setting of Late Mesozoic Felsic Magmatic Rocks in the Wangmushan Mining District, Northern Fujian, South China

Geological Journal, EarlyView.
The rhyolitic ignimbrite and K‐feldspar granite porphyry from the Wangmushan mining district, northern Fujian yield ages of 173.8 ± 0.8 and 102.6 ± 0.4 Ma, respectively. Geochemical data, zircon trace elements, whole‐rock Sr–Nd–Pb isotope data, and zircon Hf isotopic compositions indicate that the rhyolitic ignimbrite originated from partial remelting ...
Wei Shaogang, Hong Wentao, Xiao Fan, Jin Guodong, Shi Hongyang, Ma Zhiwang, Wu Chen, Xue Yujingyang   +7 more
wiley   +1 more source

Ichnology of the Rhätsandstein in the Exter Formation (Triassic), Germany

Geological Journal, EarlyView.
Trace fossils from the Rhätsandstein of southern Germany record repeated colonization of high‐energy shallow‐marine substrates before the Triassic–Jurassic transition. The assemblage reflects environmental and preservational controls on ichnodiversity.
Daniel Sedorko, James H. Nebelsick
wiley   +1 more source

Solar System’s earliest solids as tracers of the accretion region of Ryugu and Ivuna-type carbonaceous chondrites

Communications Earth & Environment
Samples from the carbonaceous asteroid Ryugu and CI (Ivuna-type) chondrites are dominated by low-temperature, aqueously formed secondary minerals, with rare occurrences of anhydrous primary minerals that formed in the high-temperature region of the solar
Noriyuki Kawasaki, Sota Arakawa, Yushi Miyamoto, Naoya Sakamoto, Daiki Yamamoto, Sara S. Russell, Hisayoshi Yurimoto   +6 more
doaj   +1 more source

Late Quaternary lake filling and drying in northern Australia's largest freshwater lake

Journal of Quaternary Science, EarlyView.
ABSTRACT Lake Woods, Jurrkulu, is northern Australia's largest freshwater lake filled today in strong Indo–Australian summer monsoons (IASM) to maximum depths of ~5 m. On the western margins of the lake, two large arcuate ridges occur 20 to 40 m above the lake floor and inset within these are other mid‐elevation lake deposits, such as depositional ...
Tim J. Cohen, Zenobia Jacobs, Caitlyn Scobie, Sam Marx, William Reynolds, Matthew S. Forbes, Haidee Cadd, Xue Rui, Laura Mogensen, Alexandru Codilean, Réka H. Fülöp, Klaus M. Wilcken, Fabian Boesl, Alex F. Wall, Nicola Stromsoe   +14 more
wiley   +1 more source

Sierra Gorda 009: A new member of the metal‐rich G chondrites grouplet [PDF]

, 2020
We investigated the metal‐rich chondrite Sierra Gorda (SG) 009, a member of the new G chondrite grouplet (also including NWA 5492, GRO 95551). G chondrites contain 23% metal, very reduced silicates, and rare oxidized mineral phases (Mg‐chromite, FeO‐rich
Grokhovsky, Victor I., Righter, K., Korochantsev, A. V., Cyril A. Lorenz, Lorenz, C. A., Lorenz, Cyril A., Corrigan, C. M., Righter, Kevin, Munir Humayun, Thomas Ludwig, Svetlana N. Teplyakova, Ivanova, M. A., Ludwig, T., Corrigan, Catherine M., Humayun, M., Teplyakova, Svetlana N., Alexander B. Verchovsky, Ivanova, Marina A., Verchovsky, A. B., Franchi, Ian, Verchovsky, Alexander B., Catherine M. Corrigan, Vladimir V. Kozlov, Kozlov, Vladimir V., Franchi, I. A., Trieloff, M., Humayun, Munir, Ludwig, Thomas, Alexander V. Korochantsev, Ekaterina V. Korochantseva, Korochantseva, Ekaterina V., Victor I. Grokhovsky, Trieloff, Mario, Marina A. Ivanova, Ian A. Franchi, Kevin Righter, Korochantseva, E. V., Mario Trieloff, Kozlov, V. V., Grokhovsky, V. I., Teplyakova, S. N., Korochantsev, Alexander V.   +41 more
core   +1 more source

Рentlandite from ordinary chondrites of the Urals

Литосфера, 2016
Some new data on the chemical composition and morphology of the pentlandite from meteorites Ural (H5-6), Kunashak (L5-6), Ozernoye (L5), Severny Kolchim (H3), Kargapole (H4), and Chelyabinsk (LL5) are resulted in the paper. We found a natural decrease in
Yu. V. Erokhin, S. V. Berzin, V. V. Khiller, K. S. Ivanov   +3 more
doaj   +2 more sources

Procurement of Senonian Flint for Bladelets Production at the Early PPNB Site of Nahal Zahal in the Northern Negev Established for the First Time Using Chemical Composition Analysis

Archaeometry, EarlyView.
ABSTRACT The hypotheses of Senonian flint to be a prime source of prehistoric “chalcedony” flint artefacts from the Negev Desert (Israel) was not investigated in detail thus far. By combining trace‐element profiling with statistical interpretation, ten flint items from Nahal Zahal, an Early Pre‐Pottery Neolithic B site in the northern Negev, were ...
Meir Finkel, Michal Birkenfeld, Talia Abulafia, Keren Weiss‐Sarusi, Olga Berlin, Yoav Ben Dor   +5 more
wiley   +1 more source

Lack of resolvable titanium stable isotopic variations in bulk chondrites [PDF]

, 2018
Titanium and calcium are both refractory lithophile elements. Significant stable isotopic variations on Ti and Ca have been documented within calcium, aluminum-rich inclusions (CAIs) in carbonaceous chondrites.
Chaussidon, Marc, van Zuilen, Kirsten, Sossi, Paolo A., Pringle, Emily A., Pringle, Emily, Sossi, Paolo, Moynier, Frédéric, van Zuilen, Kirsten; id_orcid, Deng, Zhengbin   +8 more
core   +1 more source

Carbonaceous Chondrites Provide Evidence for Late-stage Planetesimal Formation in a Pressure Bump

The Astrophysical Journal
Carbonaceous chondrites are samples from planetesimals that formed 2–4 million years after solar system formation began. They consist of distinct dust components formed at different times and locations in the accretion disk, and whose abundances in ...
Nerea Gurrutxaga, Joanna Drążkowska, Vignesh Vaikundaraman, Thorsten Kleine   +3 more
doaj   +1 more source