Forensic Applications of Isotope Ratio Mass Spectrometry

Benson, Sarah

doi:10.1002/9781118180730.ch15

Cited by 1 publication

(2 citation statements)

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“…Comet 26P/Grigg-Skjellerup was identified as a source of an Earth-crossing dust stream with low Earth-encounter velocities, with peak anticipated fluxes during April in 2003(Messenger 2002. In response to this prediction, NASA performed dedicated stratospheric dust collections to target potential IDPs from this comet stream in April 2003.…”

Section: Introductionmentioning

confidence: 99%

“…(b) Nanoscale elemental X-ray (C, O, Mg, Mn, Si, Cr, and Fe K-lines) maps of grain Brownleeite 1 from the same region shown in a. Manganese and Mg maps show that the brownleeite core is surrounded by a LIME olivine mantle. The top center image is an image ratio map of Mn K to Si K counts plot in Hue, Saturation, Intensity (HSI) colorspace (Benson 2003 …”

Section: Introductionmentioning

confidence: 99%

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Brownleeite: A new manganese silicide mineral in an interplanetary dust particle

Nakamura‐Messenger

Keller

Clemett

et al. 2010

American Mineralogist

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Brownleeite, ideally stoichiometric MnSi, is a manganese silicide not previously observed in nature that was discovered within an interplanetary dust particle that likely originated from a comet. Three submicrometer brownleeite grains were found, with one of them poikilitically enclosed by Mnbearing forsterite. Owing to the small size of the brownleeite grains, it was not possible to determine conventional macroscopic properties of this mineral; however, the chemical composition and crystal structure were well constrained by extensive quantitative energy dispersive X-ray analysis and electron diffraction using transmission electron microscopy (TEM). The crystal system for brownleeite is cubic (a = 4.557 Å) with space group P2 1 3, cell volume = 94.63 Å 3 , Z = 4, density (calculated) = 2.913 g/cm 3 , and empirical formula: (Mn 0.77 Fe 0.18 Cr 0.05 )Si. These brownleeite grains likely formed as high-temperature condensates either in the early Solar System or in the outflow of an evolved star or supernova explosion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%