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Comprehensive Study of Hydrated IDPs: X-Ray Diffraction, IR Spectroscopy and Electron Microscopic AnalysisChondritic hydrated interplanetary dust particles (IDPs) comprise up to 50% of all IDPs collected in the stratosphere(1). Although much is known about the mineralogy, chemistry and carbon abundance of hydrated IDPs (2-4) controversies still exist regarding their formation, history, and relationship to other primitive solar system materials. Hydrated IDPs are generally believed to be derived from asteroidal sources that have undergone some degree of aqueous alteration. However, the high C contents of hydrated IDPs (by 2 to 6X CI levels (3,4) indicate that they are probably not derived from the same parent bodies sampled by the known chondritic meteorites. We report the comprehensive study of individual hydrated IDPs. The strong depletion in Ca (I) has been used as a diagnostic feature of hydrated IDPs. The particles are embedded in elemental sulfur or low viscosity epoxy and ultramicrotomed thin sections are observed using a transmission electron microscope (TEM) equipped with an energy-dispersive X-ray detector (EDX) followed by other measurements including: 1) FTIR microspectroscopy to understand the significant constraints on the organic functionality and the nature of the C-bearing phases and 2) powder X-ray difiaction using a synchrotron X-ray source to understand the bulk mineralogy of the particles.
Document ID
20030073587
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Nakamura, K.
(NASA Johnson Space Center Houston, TX, United States)
Keller, L. P.
(NASA Johnson Space Center Houston, TX, United States)
Nakamura, T.
(Kyushu Univ. Fukuoka, Japan)
Noguchi, T.
(Ibaraki Univ. Mito, Japan)
Nozaki, W.
(Kyushu Univ. Fukuoka, Japan)
Tomeoka, K.
(Kobe Univ. Japan)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Workshop on Cometary Dust in Astrophysics
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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