High Resolution Stepped-Combustion Mass Spectrometry: Application to the Detection and Analysis of Fine-Grained Diamond in Meteorites and Rocks |
| |
| Authors: | Stuart R Boyd Ian P Wright Conel MO'D Alexander CT Pillinger |
| |
| Institution: | Planetary Sciences Research Institute, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK |
| |
| Abstract: | An analytical system and operating protocol are described for high resolution, stepped-combustion mass spectrometry, designed for the extraction, purification, quantification and isotopic analysis of light elements (e.g. C and N) in fine-grained reduced components (e.g. diamond) which have been chemically extracted from natural samples (e.g. meteorites). Specifically, a simple model has been developed for the extraction of diamond from meteorite and its analysis by high resolution stepped heating under an atmosphere of oxygen. Changes in the pressure of oxygen within the range 1.3 to 12kPa (10 to 90 torr) were not found to have any detectable effect on the combustion. Results obtained by this procedure were compared with those predicted by a model and excellent agreement was found, taking into account the limitations of this approach. Results of a preliminary attempt to find fine-grained diamond in a lamproite are outlined. |
| |
| Keywords: | diamond stepped heating mass spectrometry stable isotopes kinetics |
|
|
