Chondritic lithic clasts in the CB/CH-like meteorite Isheyevo: Fragments of previously unsampled parent bodies

Fossils of Cyanobacteria in CI1 Carbonaceous Meteorites: Implications to Life on Comets, Europa, and Enceladus

The first suggestion for the use of oxygen isotopes in cosmochemistry was that of H. C. Urey and colleagues in 1934, but appropriate instrumentation had not yet been developed. The modern era of oxygen isotope cosmochemistry began with the study of Apollo lunar samples in 1969 and of Allende refractory inclusions in 1973. The large (>5%) variations in 17O/16O and 18O/16O ratios, and small variations in 17O/18O were first interpreted as nucleosynthetic effects, but are now recognized to be the result of chemical processes early in Solar System history. Thus oxygen isotopes provide natural tracers for processes of formation of solid bodies in the inner Solar System. In particular, oxygen isotopes are very useful in recognizing genetic associations among meteorite groups. They also have been valuable in the study of parent body processes, such as metamorphism and aqueous alteration. There is conjecture that the ultimate cause of the oxygen isotope effects may be isotope-selective photodissociation of CO, which will be tested by isotopic measurement of solar oxygen and nitrogen collected in the NASA Genesis mission.

Oxygen Isotopes in the Early Solar System — A Historical Perspective

The KATRIN experiment in Karlsruhe Germany will monitor the decay of tritium, which produces an electron-antineutrino. While the present upper bound for its mass is 2 eV/c2, KATRIN will search down to 0.2 eV=c2. If the dark matter of the galaxy cluster Abell 1689 is modeled as degenerate isothermal fermions, the strong and weak lensing data may be explained by degenerate neutrinos with mass of 1.5 eV=c2. Strong lensing data beyond 275 kpc put tension on the standard cold dark matter interpretation. In the most natural scenario, the electron antineutrino will have a mass of 1.5 eV/c2, a value that will be tested in KATRIN.

http://sdcc3.ucsd.edu/~ir118/Leiden2010/JCosNuCor.pdf

Prediction for the neutrino mass in the KATRIN experiment from lensing by the galaxy cluster A1689

/pdf/bibliography-of-canadian-meteorites-55l7ek6kno.pdf

Bibliography of canadian meteorites

Aqueous alteration of primitive meteorites is among the
earliest and the most widespread geological processes in the solar system.
A better understanding of these processes would help us constrain the early
evolution condition of the solar system and test models of thermal and
chemical evolution of planetesimals. In this study, we extended our previous
work on CM chondrites by further applying carbonate clumped isotope
thermometry to other types of carbonaceous chondrites (GRO 95577,
CR1; Orgueil, CI; and Tagish Lake, ungrouped type 2) to determine the
conditions of their aqueous alteration. Carbonate in GRO 95577 is almost
exclusively calcite; both Orgueil and Tagish Lake contain complex mixtures
of several carbonates, which necessitated stepped phosphoric acid digestion
to separately analyze calcite, dolomite/ankerite and breunnerite. CO_2 gases
derived from these acid digestions are exceptionally rich in sulfur and organic
contaminants. While so far no consistent evidence suggests their influences
on Δ_(47) after extensive purification, we are continuing working on this issue.

M. E. Zolensky

Papers

Temperatures of aqueous alteration on carbonaceous chondrite parent bodies