High-precision barium isotope measurements yielded differences of up to 25 parts per million in the 137Ba/136Ba ratio and 60 parts per million in the 138Ba/136Ba ratio between chondrites and Earth. These differences probably arose from incomplete mixing of nucleosynthetic material in the solar nebula. Chondritic meteorites have a slight excess of supernova-derived material as compared to Earth, demonstrating that the solar nebula was not perfectly homogenized upon formation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.1132595 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A high-resolution in situ X-ray diffraction study of mineral transitions due to post-hydration heating in CM chondrite meteorites.
Earth Planets Space
December 2024
School of Geographical and Earth Sciences, The University of Glasgow, Glasgow, G12 8RZ Scotland, UK.
Abstract: The effects of post-hydration heating over a broad range of temperatures are evident in many Mighei-like carbonaceous (CM) chondrites as a variety of mineral transitions. To better understand these processes and how a CM chondrite's starting composition may have affected them, we experimentally heated two meteorites with different degrees of aqueous alteration, Allan Hills 83100 and Murchison, at 25 °C temperature steps from 200 °C to 950 °C and 300 °C to 750 °C, respectively. During heating, synchrotron in situ X-ray diffraction patterns were collected.
View Article and Find Full Text PDFUnveiling the resource potential of space debris: A forecast of valuable metals to 2050.
Waste Manag
December 2024
Cooperative Program for Resources Engineering, Graduate School of Engineering, Kyushu University, Fukuoka, Japan.
The proliferation of space debris poses a significant challenge in modern space exploration, with potential repercussions for the future space environment and activities. Various research and technological developments have addressed these concerns, including estimating the number of space debris orbiting the Earth and its efficient removal. This paper proposes a novel resource-oriented perspective on space debris and focuses on the composition and resource potential of space debris.
View Article and Find Full Text PDFTriple oxygen isotopes of lunar water unveil indigenous and cometary heritage.
Proc Natl Acad Sci U S A
December 2024
Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093.
The origin of water in the Earth-Moon system is a pivotal question in planetary science, particularly with the need for water resources in the race to establish lunar bases. The candidate origins of lunar water are an indigenous lunar component, solar wind water production, and the delivery of meteoritic and cometary material. Characterizing the oxygen isotopic composition of water provides information on lunar oxygen sources.
View Article and Find Full Text PDFEfficient Cd separation protocols for high-precision cadmium isotope analyses of diverse samples by double spike MC-ICP-MS.
Talanta
November 2024
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.
Cadmium isotope analyses are applied for research in planetary, Earth, environmental and life sciences. However, there is still a lack of efficient methods for the separation of the trace element Cd from the different types of samples that are of interest for isotopic analyses. This study presents new and improved Cd separation and purification techniques for meteorite, diverse terrestrial and seawater samples prior to Cd isotope measurements by multiple collector ICP-MS using the double spike approach for mass bias correction.
View Article and Find Full Text PDFSimplified Meteorite Parent Body Alteration of Amino Acids by Hydrothermal Processes.
Astrobiology
December 2024
Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
Article Synopsis
- * The research simulated the aqueous alteration processes of residues from irradiated interstellar ice, using minerals like serpentinite and the Allende meteorite to study amino acid changes.
- * Results showed that minerals and their types crucially affect the creation and breakdown of amino acids during these simulated experiments.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!