نتایج جستجو برای: meteoritic iron
تعداد نتایج: 143039 فیلتر نتایج به سال:
We measured the Ni isotopic composition of metal from a variety of meteorite groups to search for variations in the 60Ni abundance from the decay of the short-lived nuclide 60Fe (t(1/2) = 1.49 My) and for possible nucleosynthetic effects in the other stable isotopes of Ni. We developed a high-yield Ni separation procedure based on a combination of anion and cation exchange chromatography. Nicke...
[1] Reduced weathering rates due to the lack of liquid water and significantly greater typical surface ages should result in a higher density of meteorites on the surface of Mars compared to Earth. Several meteorites were identified among the rocks investigated during Opportunity’s traverse across the sandy Meridiani plains. Heat Shield Rock is a IAB iron meteorite and has been officially recog...
Phosphorus is ubiquitous in planet Earth and plays a fundamental role all living systems. Finding reasonable prebiotic source of phosphorus not trivial, as common sources where it present nowadays are the form phosphate minerals, which rather insoluble nonreactive materials, making unavailable for ready incorporation organisms. A possible from exogenous meteoritic bombardment and, particular, i...
The generally adopted value for the solar abundance of indium is over six times higher than the meteoritic value. We address this discrepancy through numerical synthesis of the 451.13 nm line on which all indium abundance studies are based, both for the quiet-sun and the sunspot umbra spectrum, employing standard atmosphere models and accounting for hyperfine structure and Zeeman splitting in d...
Dust from Antarctica reveals a new type of meteoritic event that vaporized the surface ice sheet ~430 ka ago.
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