208 research outputs found
Recommended from our members
Towards the isotopic measurement of solar wind carbon in the Genesis silicon target
We report a current stage of the carbon isotope measurements in the Genesis Si target
Recommended from our members
Separation of Q-Noble gas carrier from bulk carbon in enstatite chondrites by stepped combustion
Detailed stepped combustion of HF-HCl residues from carbonaceous and enstatite chondrites suggest Q-noble gas carrier is different from bulk carbon in the meteorites
Recommended from our members
Noble gases from the planetary nebula stage of stellar evolution implanted in meteoritic SiC grains
Recommended from our members
Continued investigation of the light element geochemistry of Tagish Lake
We have determined the abundance and isotopic composition of two separate carbonate generations within Tagish Lake. Nitrogen isotope analysis of the chondrite shows it to be organic-rich, with d15N values higher than in CI and CM chondrites
Recommended from our members
Cryptoendolith communities in Antarctic dry valley region sandstones: Potential analogues of Martian life-forms
We are studying cryptoendolith-bearing Antarctic sandstones, to determine if the microbes alter the elemental composition of the rocks. If there is an effect, then it might be a tracer for the presence of micro-organisms in martian surface materials
Recommended from our members
Carbon, nitrogen and noble gases in diamond separates from the Novo-Urei ureilite
Recommended from our members
Xenon isotopes in nanodiamonds and other presolar grains
pdf freely available cb 18/07/0
Recommended from our members
Noble gases in Tagish Lake
From the introduction: Tagish Lake has been classified as a CI2 chondrite [1] with an interstellar grain abundance enhanced over that of CI1 and CM2 chondrites [2]. Noble gases have been used as markers for the presence of exotic, presolar grains in chondritic meteorites: Xe-HL (nanodiamonds) and Xe-s/Ne-E (SiC). We have measured 4He, Ne, Ar and Xe in whole-rock Tagish Lake, and an orthophosphoric acid-resistant residue, in an effort to define more precisely the relative abundances of the different presolar components present, and to verify whether or not the meteorite has an enhanced complement of presolar diamonds. For comparison, whole-rock samples of Orgueil and Murchison have also been analysed using the same experimental procedure
Recommended from our members
The Fountain Hills meteorite: A new CBa chondrite from Arizona
We describe a new member of the CR chondrite clan and compare it to other members of this group
- …