Fabric Code: tpr12

Saipan vitric

Glass-rich volcanic sands, quartz-free, derived from either aphyric dacite or felsic andesite. Tan to brown vesicular glass. Feldspar is plagioclase. Clinopyroxene and orthopyroxene present.

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 2 1 0 0 0 0 0 0 0 6 0 0 vitric, felsitic
Min 0 0 2 1 0 0 0 0 0 0 0 6 0 0 Marianas

Representative slides:

Slide Site Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_4_16 Taga (Tinian) Saipan 0 0 2 1 0 2 0 0 0 0 0 6 0 0 vitric, felsitic
WD_4_17 Taga (Tinian) Saipan 0 0 2 1 0 0 0 0 0 0 0 6 0 0 vitric, felsitic

WD_4_16

TagaTinian_15_6 TagaTinian_15_6
Sherd 15-6 from Taga (Tinian). Slide WD_4_16 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO. Imaged by K. Hardy and M. Leclerc, ANU.

Glass-rich volcanic sand , Type C, tan to brown vesicular glass. Marianas cordmarked sherd. Clinopyroxene and orthopyroxene.


WD_4_17

TagaTinian_15_7 TagaTinian_15_7
Sherd 15-7 from Taga (Tinian). Slide WD_4_17 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO. Imaged by K. Hardy and M. Leclerc, ANU.

Glass-rich volcanic sand , Type C, Marianas incised sherd. Clinopyroxene dominant, and orthopyroxene.


References:

323 Mariana, reports 1-15 for MTAT, 1998 (Dickinson, W.)