Transmission electron microscopy of the 'LOW-CA' hydrated interplanetary dust particle

Details Transmission electron microscopy of the 'LOW-CA' hydrated interplanetary dust particle Transmission electron microscopy of the 'LOW-CA' hydrated interplanetary dust particle

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..69..243t&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 69, no. 2, Aug. 1984, p. 243-254.

Mathematics

Logic

35

Carbonaceous Chondrites, Chemical Composition, Electron Microscopy, Interplanetary Dust, Aluminum, Calcium, Iron, Magnesium, Manganese, Nickel, Silicates, Silicon, Interplanetary Dust, Cosmic Dust, Microscopy, Tem, Calcium, Particles, Composition, Hydration, Mineralogy, Phyllosilicates, Observations, Description, Abundance, Comparisons

Scientific paper

Transmission electron microscopy of a hydrated interplanetary dust particle indicates that it consists largely of a poorly crystalline phyllosilicate containing Fe, Mg and Al with an interlayer spacing of 10 to 12 A and so is distinct from the major phyllosilicate in CI and CM carbonaceous chondrites. The silicate is probably an Fe- and Mg-rich smectite or mica. Submicron, spherical to euhedral pyrrhotite and pentlandite are prominent. Unusual, low-Ni pentlandite is also common and typically occurs as rectangular platelets. Unlike many chondritic interplanetary dust particles, olivine is rare and pyroxene was not observed. Other less abundant phases are magnetite, chromite, and an unidentified phase containing Fe, Mg, Si, Ca, and Mn. This particle differs from a hydrated micrometeorite described previously by Brownlee (1978), indicating there are mineralogically different subsets of hydrated interplanetary dust particles. Despite gross similarities in mineralogy between the particle and the carbonaceous chondrites, they show appreciable differences in detail.

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