Volcanic ash, Spurr (Ashton)

Categories
TERRESTRIAL AEROSOLS
Summary: AEROSOLS
Cosmic analogs subcategories
Asteroids
Circumstellar shells
Comets
Terrestrial Aerosols Subcategories
Volcanic
Origin

Crater Peak on the south side of Mount Spurr volcano, across Cook Inlet, Alaska, USA, 125 km west of Anchorage. The particles are from the 18 August 1992 eruption and were collected 270 km southeast of the volcano.

Main constituent
57-78 wt% glass, plagioclase feldspar, opx, magnetite, amphibole, cpx
Practical significance

Interpretation of remote sensing data. Analogues of other planets' atmospheric dust, and dust in comets, asteroids, and circumstellar shells.

Particle size Fraunhofer: reff (μm)
2.7
Particle size Fraunhofer: veff
4.9
Size distribution plot:
Size Distribution Spurr (Ashton)
Particle shape

Irregular

Imaging
SEM
SEM/TEM images:
Spurr (Ashton) SEM Image 1
Spurr (Ashton) SEM Image 2
All SEM/TEM images (zip file)
Spurr (Ashton) SEM Images
Color
Dark grey
Scattering matrix (1) wavelength in nm
632.80 nm
Scattering matrix (1) table
matrix_spurrashton_633nm.txt
Scattering matrix (1) plot:
Scattering matrix elements Spurr (Ashton)
Refractive index

Estimated to be in the range [1.48-1.56] + i[0.0018-0.02]

Angle range (deg)
[3,174]
Reference/s
Muñoz et al., 2004