Results 11 to 20 of about 7,943 (231)

Рentlandite from ordinary chondrites of the Urals [PDF]

open access: yesЛитосфера, 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   +3 more
doaj   +3 more sources

Carbon Speciation and Solubility in Silicate Melts

open access: yesGeophysical Monograph Series, Page 179-194., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Natalia Solomatova   +2 more
wiley  

+5 more sources

The noble gases in five ordinary chondrites from Grove Mountains in Antarctica [PDF]

open access: yes, 2020
Here we present the abundances and isotopic compositions of the noble gases He, Ne, Ar, Kr, and Xe in five bulk ordinary chondrites from Antarctica, namely Grove Mountains (GRV)054472, GRV053690, GRV022403, GRV023149, and GRV052243.
Ranjith, P. M.   +9 more
core   +1 more source

Magnetic classification of stony meteorites: 2. Non-ordinary chondrites [PDF]

open access: yes, 2008
International audienceA database of magnetic susceptibility (chi) measurements on different non-ordinary chondrites (C, E, R, and ungrouped) populations is presented and compared to our previous similar work on ordinary chondrites.
Bourot-Denise, Michèle   +27 more
core   +3 more sources

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 229-246., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson   +2 more
wiley  

+2 more sources

Extended chronologies of aqueous alteration in the CM2 carbonaceous chondrites: evidence from carbonates in Queen Alexandra Range 93005 [PDF]

open access: yes, 2012
The Antarctic CM2 carbonaceous chondrite QUE 93005 contains four compositionally distinct carbonates, namely breunnerite, calcite, dolomite and a Ca-poor dolomite. These carbonates can form monomineralic grains, or may be intergrown as bimineralic grains
Alexander, C.   +4 more
core   +1 more source

Pitted Terrain on Vesta and Implications for the Presence of Volatiles. [PDF]

open access: yes, 2012
We investigated the origin of unusual pitted terrain on asteroid Vesta, revealed in images from the Dawn spacecraft. Pitted terrain is characterized by irregular rimless depressions found in and around several impact craters, with a distinct morphology
Reddy, V.   +44 more
core   +1 more source

Possible Ribose Synthesis in Carbonaceous Planetesimals

open access: yesLife, 2022
The origin of life might be sparked by the polymerization of the first RNA molecules in Darwinian ponds during wet-dry cycles. The key life-building block ribose was found in carbonaceous chondrites.
Klaus Paschek   +7 more
doaj   +1 more source

Trace phases in CI chondrites Alais and Orgueil [PDF]

open access: yes, 1990
Minor phases in meteorites are important indicators of parent-body processing conditions. For example, Kerridge and others (1, 2) have shown that the presence of sulphates and carbonates in CI chondrites provides evidence for aqueous alteration on the ...
Kaser, Stacy A., Mackinnon, Ian D.R.
core   +1 more source

Enstatite chondrites: condensation and metamorphism under extremely reducing conditions and contributions to the Earth

open access: yesProgress in Earth and Planetary Science, 2022
Enstatite chondrites are a small clan of meteorites, only ~ 1% out of all meteorite collection. However, they are the most reduced meteorites and have almost identical isotopic compositions to those of the Earth, suggestive of significant contributions ...
Yangting Lin
doaj   +1 more source

Home - About - Disclaimer - Privacy