Microstructural and paleomagnetic insight into the cooling history of the IAB parent body

Autor: Nichols, C.I.O., Krakow, R., Herrero-Albillos, J., Kronast, F., Northwood-Smith, G., Harrison, R.J.
Přispěvatelé: European Commission, European Research Council, Engineering and Physical Sciences Research Council (UK), Ministerio de Economía y Competitividad (España), Diputación General de Aragón, Nichols, Claire [0000-0003-2947-5694], Krakow, Robert [0000-0003-3371-5662], Harrison, Richard [0000-0003-3469-762X], Apollo - University of Cambridge Repository
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
instname
Zaguán. Repositorio Digital de la Universidad de Zaragoza
ISSN: 0016-7037
Popis: The IABs represent one of only two groups of iron meteorites that did not form by fractional crystallization of liquid Fe-Ni in the core of a differentiated planetesimal. Instead, they are believed to originate from a partially differentiated body that was severely disrupted by one or more impacts during its early history. We present a detailed microstructural and paleomagnetic study of the Odessa and Toluca IAB meteorites, with a view to further constraining the complex history of the IAB parent body. X-ray photoemission electron microscopy and energy dispersive spectroscopy were used to generate high-resolution Ni/Fe maps. The crystallographic architecture of Odessa was analysed using electron backscatter diffraction. Paleomagnetic signals and the magnetic properties of several microstructures were also assessed using X-ray magnetic circular dichroism. Odessa exhibits a complex series of microstructures, requiring an unusual evolution during slow cooling. A conventional Widmanstätten microstructure, consisting of multiple generations of kamacite lamellae surrounded by M-shaped diffusion profiles, developed via continuous precipitation to temperatures below ∼400 °C. Multiple generations of pearlitic plessite nucleated from kamacite/taenite (T > 400 °C) and tetrataenite rim/taenite interfaces (T
This work was supported by the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC grant agreement numbers 320750 and 312284. RK acknowledges Rolls-Royce plc, the EPSRC and the BMWi under grants EP/H022309/1, EP/H500375/1 and 20T0813. JHA acknowledges financial support from the Spanish MINECO MAT2014-53921-R and Aragonese DGA-IMANA E34, both cofunded by Fondo Social Europeo and European Union FEDER funds.
Databáze: OpenAIRE
Externí odkaz: