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A New Method of Absorption-Phase Nanotomography for 3D Observation of Mineral-Organic-Water Textiles and its Application to Pristine Carbonaceous ChondritesPristine carbonaceous chondrites contain fine-grained matrix, which is composed largely of amorphous silicates, sub-micron silicate and sulfide crystals, and organic materials. They are regarded as primitive dust in the early Solar System that have suffered minimal alteration in their parent bodies. The matrix generally has different lithologies; some of them are unaltered but some are more or less aqueously altered. Their textures have been examined in 2D usually by FE-SEM/EDS, TEM/EDS, nano-SIMS and micro-XRD. Observation of their complex fine textures, such as spatial relation between different lithologies in 3D, is important for understanding aggregation and alteration processes. Synchrotron radiation (SR)-based X-ray tomography reveals 3D structures nondestructively with high spatial resolution of approximately greater than 100 nm. We have developed a new technique using absorption contrasts called "dual-energy tomography" (DET) to obtain 3D distribution of minerals at SPring-8, SR facility in Japan, and applied successfully to Itokawa particles. Phase and absorption contrast images can be simultaneously obtained in 3D by using "scanning-imaging x-ray microscopy" (SIXM) at SPring-8, which can discriminate between void, water and organic materials. We applied this technique combined with FIB micro-sampling to carbonaceous chondrites to search for primitive liquid water. In this study, we combined the DET and SIXM to obtain three dimensional submicron-scale association between minerals, organic materials and water and applied this to pristine carbonaceous chondrites.
Document ID
20170002369
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Tsuchiyama, A.
(Kyoto Univ. Kyoto, Japan)
Nakato, A.
(Kyoto Univ. Kyoto, Japan)
Matsuno, J.
(Kyoto Univ. Kyoto, Japan)
Sugimoto, M.
(Kyoto Univ. Kyoto, Japan)
Uesugi, K.
(Japan Synchrotron Research Inst. Hyogo, Japan)
Takeuchi, A.
(Japan Synchrotron Research Inst. Hyogo, Japan)
Nakano, T.
(Geological Survey of Japan Tsukuba, Japan)
Vaccaro, E.
(Museum of Natural History London, United Kingdom)
Russel, S.
(Museum of Natural History London, United Kingdom)
Nakamura-Messenger, K.
(NASA Johnson Space Center Houston, TX, United States)
Burton, A. S.
(NASA Johnson Space Center Houston, TX, United States)
Messenger, S.
(NASA Johnson Space Center Houston, TX, United States)
Miyake, A.
(Kyoto Univ. Kyoto, Japan)
Takigawa, A.
(Kyoto Univ. Kyoto, Japan)
Takayama, A.
(Kyoto Univ. Kyoto, Japan)
Date Acquired
March 20, 2017
Publication Date
March 20, 2017
Subject Category
Inorganic, Organic And Physical Chemistry
Instrumentation And Photography
Report/Patent Number
JSC-CN-39075
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 20, 2017
End Date: March 24, 2017
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.
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