Fabric Code: tpr285

Kita Iwo Jima andesitic

Plagioclase feldspar. Poorly sorted sandy and coarser detritus derived entirely from petrologically similar andesitic (to basaltic) volcanic sources.

Sites:

Mineral and Rock Abundances

None (0) Minor (1) Few (2) Common (3) Frequent (4) Major (5) Very Dominant (6)
0% 0-5% 5-15% 15-30 % 30-50% 50-70% 70-100%

Name Cal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ SpinelIg./Met. Rocks Sed. Rocks Grog Lithics/ Region
Max 0 0 3 0 0 0 0 0 0 0 0 6 0 0 felsitic
Min 0 0 0 0 0 0 0 0 0 0 0 5 0 0 Japan

Representative slides:

Slide Site Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_14_22 Kita Iwo Jima (Kita Iwo Jima) Bonin volcanic 0 0 2 0 0 0 0 0 0 0 0 5 0 0 vitric, lathwork, microlitic
WD_14_23 Kita Iwo Jima (Kita Iwo Jima) Bonin volcanics 0 0 1 0 0 0 0 0 0 0 0 6 0 0 microlitic, lathwork, vitric

WD_14_22

KitaIwoJima_1 KitaIwoJima_1
Sherd KIJ1 from Kita Iwo Jima (Kita Iwo Jima). Slide WD_14_22 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

According to Dickinson -only lithics present.


WD_14_23

KitaIwoJima_2 KitaIwoJima_2
Sherd KIJ2 from Kita Iwo Jima (Kita Iwo Jima). Slide WD_14_23 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Mainly andesitic lithic fragments with some plagioclase.


References:

248 Kita Iwo Jima, Ogasawara, Bonin, 2005 (Dickinson, W.)