Chondrite meteorites in our collection are revealing conditions in the early solar system and the processes that formed the planets.
Most of the 2,000 meteorites in our collection originate from a belt of minor planets between Mars and Jupiter. These asteroids formed at the same time as our solar system, around 4.5 billion years ago.
Chondrites are stony meteorites that have not melted or been modified since their formation. They preserve information about conditions in the primitive solar system, when the Sun, planets and asteroids were forming.
We are isolating chondrules in primitive chondrite meteorites and calculating how much 26Al they originally contained by measuring the daughter isotope 26Mg.
Radioactive 26Al has a half-life of 0.73 million years and decays away over time. Measuring the 26Mg content allows us to date these meteorites.
Microscopic image of a chondrule from the Palmyra (L3) ordinary chondrite.
Chondrules are surrounded by a fine-grained matrix. This matrix is not as well characterised as the larger components of meteorites.
We are investigating the origins of matrix material by studying its:
We are investigating the relationship between the mineralogy of chondrule accretionary rims and chondrule matrix.
CI meteorites are the most chemically primitive material we can access, with a composition similar to that of the Sun. We are studying the mineralogy of CI chondrites and measuring their chemical abundances and water content.
We are comparing the oxygen isotopic composition of calcium and aluminium-rich inclusions (CAI) and their rims to determine whether they formed in the same reservoir.
Sulphide elements are found in many meteorites. We are investigating the trace element composition of these elements to learn more about their abundance and distribution in the early solar system.
We use a combination of imaging techniques to determine the abundance of major and minor elements in our samples, including:
We also use techniques such as mass spectrometry to analyse trace element abundances and isotope variations within the samples.
X-ray diffraction is used as a complementary technique to determine the mineralogy of meteorites.
A guest post by Helena Bates, undergraduate student at Imperial College London.This summer I had the opportunity to work alongside scientists in the Mineral and Planetary Science Division at the Natural History Museum on a project sponsored by the Pa...
Mon, 13 Oct 2014 15:04:05
Next week is the Annual Meeting of the Meteoritical Society. This year it is being held in Morocco by scientists from Hassan II University of Casablanca. All of us in the Museum’s meteorite research team are heading out to Casablanca on Sunday ...
Wed, 03 Sep 2014 15:27:27
Meteorites containing rounded millimetre to centimetre-sized silicate objects called chondrules, surrounded by a fine-grained matrix. Chondrites have remained unmelted since their formation 4.5 billion years ago.
A group of stony, carbonaceous meteorites with a composition similar to that of the Sun. Chemically, they are the most primitive material we can study.
Round grains found in chondrite meteorites, usually around 1 millimetre in diameter.
The time taken for the radioactivity of a specified isotope to decrease to half its original value.