Results 171 to 180 of about 8,123 (247)

Phosphorus-nitrogen systematics of first-generation planetesimals constrain life-essential element delivery to Earth. [PDF]

Sci Adv
Pathak D, Dasgupta R, Iyer N.
europepmc   +1 more source

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

From magma ocean to core-mantle boundary: the key role of hydrous ferropericlase in shaping deep Earth's low-velocity anomalies. [PDF]

Natl Sci Rev
Guan SD, Wang Y, Du ZX, Yang YN, Xu YG.
europepmc   +1 more source

Origin and formation of a chondritic xenolith in Krymka (LL3.2, breccia): Indications for a late formation of the accretionary breccia

Meteoritics &Planetary Science, EarlyView.
Abstract An unusual chondritic xenolith was found in two sequentially prepared thin sections of a sample from the Krymka (LL3.2) chondrite. The xenolith has a rounded, slightly deformed shape of about 5 mm in apparent diameter and is partially surrounded by a double rim made of an inner fine‐grained silicate‐rich rim and an outer sulfide‐rich rim.
Aelita Girich, Addi Bischoff, Samuel Ebert, Kazuhide Nagashima, Andreas Morlok, Harald Hiesinger, Jasper Berndt   +6 more
wiley   +1 more source

Widespread ilmenite contributions to the surface water cycle in lunar Procellarum KREEP Terrane. [PDF]

Nat Commun
Xu Y, Shan L, Tian HC, Hao J, Lin Y, Wöhler C, Gu L, Guo Z, Li R, Zhang T, Yang W, Liu Y, Tang X, Gou S, He H, Zou Y, Li X.   +16 more
europepmc   +1 more source

Optical Properties of Interstellar Graphite and Silicate Grains: Erratum

The Astrophysical Journal, 1987
B. T. Draine, Hyung Mok Lee
openaire   +1 more source

Nanoscale space weathering features in mature lunar soil revealed by TEM and APT

Meteoritics &Planetary Science, EarlyView.
Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer, Alexander M. Kling, Luke Daly, Dieter Isheim, David N. Seidman, Michelle S. Thompson, Philipp R. Heck   +6 more
wiley   +1 more source

Low-energy glycine formation and spectral masking in star-forming regions. [PDF]

Commun Chem
Mates-Torres E, Rimola A.
europepmc   +1 more source

Accelerated Ageing of Blast Furnace Cement-Dolomite Mortars: Phase Changes, Microstructural Evolution, and Mechanical Performance. [PDF]

Materials (Basel)
Sutormina E, Marinšek M, Meden A.
europepmc   +1 more source

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, EarlyView.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source