Jan L. Hellmann
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View article: Origin of Isotopic Diversity among Carbonaceous Chondrites
Origin of Isotopic Diversity among Carbonaceous Chondrites Open
Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system. Here, using new and previously published Cr, Ti, and Te isotopic data,…
View article: Origin of isotopic diversity among carbonaceous chondrites
Origin of isotopic diversity among carbonaceous chondrites Open
Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system. Here, using new and previously published Cr, Ti, and Te isotopic data,…
Isotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System Open
Pallasites are mixtures of core and mantle material that may have originated from the core–mantle boundary of a differentiated body. However, recent studies have introduced the possibility that they record an impact mix, in which case an i…
Origin of volatile element depletion among carbonaceous chondrites Open
Compared to the composition of CI chondrites and the Sun, all other carbonaceous chondrites are variably depleted in volatile elements. However, the origin of these depletions, and how they are related to volatile loss during high-temperat…
The old, unique C1 chondrite Flensburg – Insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies Open
On September 12, 2019 at 12:49:48 (UT) a bolide was observed by hundreds of eye-witnesses from the Netherlands, Germany, Belgium, Denmark and the UK. One day later a small meteorite stone was found by accident in Flensburg. The presence of…
Hf‐W chronology of a macrochondrule from the L5/6 chondrite Northwest Africa 8192 Open
A large, igneous‐textured, and 2 cm‐sized spherical object from the L5/6 chondrite NWA 8192 was investigated for its chemical composition, petrography, O isotopic composition, and Hf‐W chronology. The petrography and chemical data indicate…
Tungsten Isotopes and the Origin of Chondrules and Chondrites Open
Chondrules and matrix from carbonaceous chondrites exhibit complementary nucleosynthetic W isotope anomalies that result from the depletion of a metallic s-process carrier in the chondrules, and the enrichment of this carrier in the matrix…