Fabric Code: tpr192

Garua feldspathic

Generally andesitic, fine- to medium-grained, subangular to subrounded temper sand of probable beach origin. Feldspar grains, distinctly more volcanic lithic fragments than Boduna tempers, and distinctly fewer ferromagnesian grains, both silicates and oxides than Boduna. Minor quartz grains and obsidian fragments. Clinopyroxene dominant, but minor orthopyroxene.

Fabric Class:

Feldspathic Pyroxenic: Dominated by feldspar inclusions, with pyroxenes.

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 5 2 1 1 1 0 0 0 0 3 0 0 microlitic, lathwork, vitric
Min 0 1 5 2 1 1 1 0 0 0 0 3 0 0 Bismarck

Representative slides:

Slide Site Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_41_9 Garua (Garua) New Britain 0 1 5 2 1 1 1 0 0 0 0 3 0 0 microlitic, lathwork, vitric
WD_41_10 Garua (Garua) New Britain 0 1 5 2 1 1 1 0 0 0 0 3 0 0 microlitic, lathwork, vitric

WD_41_9

GaruaFS2_14_94 GaruaFS2_14_94
Sherd FS2-14-94 from Garua (Garua). Slide WD_41_9 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image (user: Guest pwd: Guest) or full slide in VIMIPO. Imaged by K. Hardy and M. Leclerc, ANU.

Generally andesitic, fine- to medium-grained, subangular to subrounded temper sand of probable beach origin. Clinopyroxene dominant, but minor orthopyroxene.


WD_41_10

GaruaFS2_15_93 GaruaFS2_15_93
Sherd FS2-15-93 from Garua (Garua). Slide WD_41_10 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.

Generally andesitic, fine- to medium-grained, subangular to subrounded temper sand of probable beach origin. Has orthopyroxene in addition to clinopyroxene.


References:

149 New Britain, PNG, 1997 (Dickinson, W.)

174 Adwe, Arawe, New Britain, PNG, 1998 (Dickinson, W.)