Fabric Code: tpr172

Taumako andesitic

Andesitic volcanic sand, moderately well sorted, subrounded volcanic sand, predominantly volcanic rock fragments, mainly microlitic but partly felsitic or glassy, and also including some microcrystalline fragments of hypabyssal igneous rocks plagioclase feldspar, and minor clinopyroxene.

Fabric Class:

Felsitic-Microlitic Feldspathic: Dominated by felsitic and/or microlitic inclusions with feldspars.

Andesitic Arc: Dominated by andesite and basalt lithic fragments, with microlitic, felsitic and vitric textures, and the andesite minerals (plagioclase, clinopyroxene and sometimes hornblende).

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 1 3 2 0 2 0 0 0 0 0 6 0 0 microlitic, vitric, felsitic, microphaneritic
Min 0 0 3 1 0 1 0 0 0 0 0 5 0 0 Solomons

Representative slides:

Slide Site Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_105_3 Taumako (Taumako) Taumako 0 1 3 1 0 1 0 0 0 0 0 6 0 0 microlitic, vitric, felsitic, microphaneritic
WD_105_4 Taumako (Taumako) Taumako 0 1 3 1 0 1 0 0 0 0 0 6 0 0 microlitic, vitric, felsitic, microphaneritic
WD_105_6 Taumako (Taumako) Taumako 0 1 3 1 0 1 0 0 0 0 0 6 0 0 microlitic, vitric, felsitic, microphaneritic
WD_105_7 Taumako (Taumako) Taumako 0 1 2 1 0 1 0 0 0 0 0 6 0 0 microlitic, vitric, felsitic, microphaneritic

WD_105_3

taumako_78_731 taumako_78_731
Sherd 78-731 from Taumako (Taumako). Slide WD_105_3 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.

Volcanic (Andesitic). Andesitic volcanic sand , moderately well sorted, subrounded volcanic sand, predominantly volcanic rock fragments, mainly microlitic but partly felsitic or glassy, and also including some microcrystalline fragments of hypabyssal igneous rocks plagioclase feldspar, and minor clinopyroxene.


WD_105_4

taumako_78_112 taumako_78_112
Sherd 78-112 from Taumako (Taumako). Slide WD_105_4 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.

Andesitic Temper. andesitic volcanic sand , moderately well sorted, subrounded volcanic sand, predominantly volcanic rock fragments, mainly microlitic but partly felsitic or glassy, and also including some microcrystalline fragments of hypabyssal igneous rocks plagioclase feldspar, and minor clinopyroxene


WD_105_6

taumako_78_301 taumako_78_301
Sherd 78-301 from Taumako (Taumako). Slide WD_105_6 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.

Volcanic Temper. andesitic volcanic sand , moderately well sorted, subrounded volcanic sand, predominantly volcanic rock fragments, mainly microlitic but partly felsitic or glassy, and also including some microcrystalline fragments of hypabyssal igneous rocks plagioclase feldspar, and minor clinopyroxene


WD_105_7

taumako_tau taumako_tau
Sherd tau from Taumako (Taumako). Slide WD_105_7 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.

Dentate-stamped Lapita sherd; Andesitic (lithic) Taumako temper sand. andesitic volcanic sand , moderately well sorted, subrounded volcanic sand, predominantly volcanic rock fragments, mainly microlitic but partly felsitic or glassy, and also including some microcrystalline fragments of hypabyssal igneous rocks plagioclase feldspar, and minor clinopyroxene


References:

077, 78, 79 Taumako, Solomon - Appendix 6 (see WRD Rept 269) (Dickinson, W.)