FIB, TEM and LA–ICPMS investigations on melt inclusions in Martian meteorites—Analytical capabilities and geochemical insights

Bleiner, Davide; Macrì, Michele; Gasser, Philippe; Sautter, V.; Maras, Adriana

doi:10.1016/j.talanta.2005.08.022

Cited by 12 publications

(13 citation statements)

References 18 publications

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“…Two of these were commercially available certified reference materials from the National Institute of Standards and Technology (NIST 610, NIST 612), while the third was an inhouse clinopyroxene that had been previously characterized by electron microprobe analysis. The quantification procedure for melt inclusions using LA‐ICPMS has been discussed in detail in Bleiner et al. (2006).…”

Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

Melt inclusions in augite from the nakhlite meteorites: A reassessment of nakhlite parental melt and implications for petrogenesis

Sautter

Toplis

Lorand

et al. 2012

Meteorit & Planetary Scien

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Abstract-The nakhlites, a subgroup of eight clinopyroxenites thought to come from a single geological unit at the Martian surface, show melt inclusions in augite and olivine. In contrast to olivine-hosted melt inclusions, augite-hosted melt inclusions are not surrounded by fractures, and are thus considered preferential candidates for reconstructing parent liquid compositions. Furthermore, two types of augite-hosted melt inclusion have been defined and characterized in four different nakhlites (Northwest Africa [NWA] 817, Nakhla, Governador Valadares, and NWA 998): Type-I isolated inclusions in augite cores that contain euhedral to subhedral augite, Ti-magnetite, and pigeonite plus silica-rich glass and a gas bubble; Type-II microinclusions that form trails crosscutting host augite crystals. Fast-heating experiments were performed on selected pristine primary augite-hosted melt inclusions from these four samples. Of these, only data from Nakhla were considered robust for reconstruction of a nakhlite parental magma composition (NPM). Based upon careful petrographic selection and consideration of iron-magnesium ratios, our data are used to propose an NPM, which is basaltic (49.1 wt% SiO 2 ), of high Ca ⁄ Al (1.95), and K 2 O-poor (0.32 wt%). Thermodynamic modeling at an oxygen fugacity one log unit below the QFM buffer using the MELTS and PETROLOG programs implies that Mg-rich olivine was not a liquidus phase for this composition. Our analysis is used to suggest that olivine megacrysts found in the nakhlites are unlikely to have coprecipitated with augite, and thus may have been introduced during or subsequent to accumulation in the magma chamber, possibly from more evolved portions of the same chamber.

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Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

Melt inclusions in augite from the nakhlite meteorites: A reassessment of nakhlite parental melt and implications for petrogenesis

Sautter

Toplis

Lorand

et al. 2012

Meteorit & Planetary Scien

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“…beam (FIB) has been used to cut thin foils from selected inclusions for TEM and analytical electron microscopy (AEM) studies (e.g., Dobrzhinestskaya et al 2003, Wirth & Rocholl 2004, Bleiner et al 2006, Wirth 2009). Although this approach offers exceptional micro-and nanoscale characterization of solids in small inclusions, it is not suitable for modal analysis because part of the inclusion is destroyed during foil preparation, and only a thin (ca.…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Textural and Chemical Characterization of Polyphase Inclusions in Spodumene Using a Dual Focused Ion Beam - Scanning Electron Microscope (Fib-Sem)

Anderson¹,

McCarron²

2011

The Canadian Mineralogist

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A dual-beam focused ion-beam -scanning electron microscope (FIB-SEM) instrument was used for detailed textural and chemical analysis of polyphase inclusions in spodumene. Our 3D representation of an inclusion (GB-38) was constructed from SEM images of serial cross-sections exposed by milling laterally through a selected inclusion with a 30 keV beam of Ga ions. The volume of the inclusion and daughter phases was determined from the sum of the volume of parallel slices; the volume of each slice was determined by multiplying the measured slice area by its thickness. Semiquantitative energy-dispersive X-ray (EDX) analysis and element mapping were performed on each cross-section to facilitate the identification of all solids within the inclusion. FIB-SEM analysis of spodumene-hosted inclusions from the Tanco and Greenbushes occurrences of granitic pegmatite are presented to demonstrate the advantages of 3D analysis for petrographic investigations of polyphase inclusions. The highresolution 3D reconstructions afforded by the FIB-SEM method significantly extend our ability to study and interpret complex solid-rich fluid and melt inclusions in igneous and in high-pressure metamorphic rocks. SOMMAiRENous nous sommes servis d'un instrument à deux faisceaux, dont un faisceau focalisé d'ions et un microscope électronique à balayage (FIB-SEM), afin de faire une analyse texturale et compositionnelle détaillée d'inclusions polyphasées dans le spodumène. Nous avons construit notre représentation d'une inclusion (GB-38) en trois dimensions à partir d'images effectuées au microscope électronique d'une série de coupes transversales préparées en taillant latéralement une inclusion choisie avec un faisceau de 30 keV d'ions de Ga. Le volume de l'inclusion et des phases secondaires a été déterminé à partir de la somme des volumes des tranches parallèles. On obtient le volume de chaque tranche en multipliant son aire par son épaisseur. Une analyse semiquantitative par dispersion d'énergie (EDX) et une répartition des éléments, effectuées sur chaque tranche, ont facilité l'identification de toutes les phases solides au sein de l'inclusion. L'analyse par la technique FIB-SEM d'inclusions piégées dans le spodumène provenant des pegmatites granitiques de Tanco et Greenbushes démontre les avantages d'une analyse tri-dimensionnelle pour les études pétrographiques d'inclusions polyphasées. Les reconstructions tri-dimensionnelles qui en résultent augmentent sensiblement notre abilité d'étudier et d'interpréter les complexités des inclusions fluides ou de reliquats magmatiques riches en phases solides dans les roches ignées et les roches métamorphiques de haute pression. (Traduit par la Rédaction)Mots-clés: inclusions polyphasées, inclusions fluides, reliquats magmatiques, pétrographie des inclusions, approche FIB-SEM à deux faisceaux, sections en série, reconstruction 3D, pegmatite granitique, spodumène. §

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“…The FIB–SEM technique has been used to prepare TEM lamellae of natural microdiamonds (Dobrzhinetskaya et al , 2003), phases from high‐pressure experiments (Dobrzhinetskaya et al , 2004; Irifune et al , 2005) and weathered surfaces of feldspar crystals (Lee et al , 2007). Other applications in earth sciences have used FIB milling to make sections of melt inclusions (Bleiner et al , 2006) and microfossils (Kempe et al , 2005).…”

Section: Introductionmentioning

confidence: 99%

Tomography of insulating biological and geological materials using focused ion beam (FIB) sectioning and low‐kV BSE imaging

Winter

Schneijdenberg

Lebbink

et al. 2009

Journal of Microscopy

118

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SummaryTomography in a focused ion beam (FIB) scanning electron microscope (SEM) is a powerful method for the characterization of three-dimensional micro-and nanostructures. Although this technique can be routinely applied to conducting materials, FIB-SEM tomography of many insulators, including biological, geological and ceramic samples, is often more difficult because of charging effects that disturb the serial sectioning using the ion beam or the imaging using the electron beam. Here, we show that automatic tomography of biological and geological samples can be achieved by serial sectioning with a focused ion beam and block-face imaging using low-kV backscattered electrons. In addition, a new ion milling geometry is used that reduces the effects of intensity gradients that are inherent in conventional geometry used for FIB-SEM tomography.

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FIB, TEM and LA–ICPMS investigations on melt inclusions in Martian meteorites—Analytical capabilities and geochemical insights

Cited by 12 publications

References 18 publications

Melt inclusions in augite from the nakhlite meteorites: A reassessment of nakhlite parental melt and implications for petrogenesis

Melt inclusions in augite from the nakhlite meteorites: A reassessment of nakhlite parental melt and implications for petrogenesis

Three-Dimensional Textural and Chemical Characterization of Polyphase Inclusions in Spodumene Using a Dual Focused Ion Beam - Scanning Electron Microscope (Fib-Sem)

Tomography of insulating biological and geological materials using focused ion beam (FIB) sectioning and low‐kV BSE imaging

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