TY - JOUR
T1 - Transmission electron microscopy of the "LOW-CA" hydrated interplanetary dust particle
AU - Tomeoka, Kazushige
AU - Buseck, P R
N1 - Funding Information:
Bradley, D.E. Brownlee, R. Christoffersen, and L. Trembath for useful discussions. The electron microscopy was performed at the Facility for High Resolution Electron Microscopy at Arizona State University, which is funded by the NSF. This work was supported by NASA grant NAGW-143.
PY - 1984/8
Y1 - 1984/8
N2 - 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 Å 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 ( < 3 at.% 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 [1], 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.
AB - 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 Å 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 ( < 3 at.% 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 [1], 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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U2 - 10.1016/0012-821X(84)90184-5
DO - 10.1016/0012-821X(84)90184-5
M3 - Article
AN - SCOPUS:0021334980
SN - 0012-821X
VL - 69
SP - 243
EP - 254
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 2
ER -