Backarc Quartzose (Q137391967)

Clinopyroxenes, plagioclase, and lithics of basalts or shoshonite (a basaltic trachyandesite), dominate with quartz.

Note that to see the 'Geology' layer (layer options in top right corner) you may have to zoom out.

Many fabrics have a range of abundances. The range maximum (top) and minimum (bottom) are shown.

** Has full slide image available.

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
tpr94 ** 6 1 1 2 0 6 0 0 0 0 0 1 0 0 microlitic, felsitic, vitric
Mussau type CD 0 0 1 1 0 5 0 0 0 0 0 0 0 0 Bismarck
tpr106 4 3 2 1 0 3 0 0 0 0 0 1 0 0 na
Exotic New Ireland quartz-calcite 4 3 2 1 0 3 0 0 0 0 0 1 0 0 Bismarck
tpr93 ** 6 1 2 1 0 1 0 0 0 0 0 1 1 0 felsitic, vitric, chert
Mussau type B 6 1 1 0 0 0 0 0 0 0 0 0 0 0 Bismarck
tpr191b 0 3 4 1 2 2 0 1 0 0 0 4 0 0 felsitic, vitric, microlitic
Admiralty Feldspathic Felsitic 0 2 4 0 0 1 0 0 0 0 0 2 0 0 Bismarck

All slides available for those fabrics:

Slide Fabric Possible OriginWareCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_31_14 tpr106 (Exotic New Ireland quartz-calcite) Admiralty Middle Far Western Lapita (3050 - 2300 BP) 4 3 2 1 0 3 0 0 0 0 0 1 0 0 na
WD_36_17 tpr93 (Mussau type B) Admiralty Early Mussau Lapita (3250 - 2950 BP) 6 1 2 1 0 1 0 0 0 0 0 1 1 0 felsitic, vitric, chert
WD_36_20 tpr93 (Mussau type B) Admiralty Early Mussau Lapita (3250 - 2950 BP) 6 1 2 1 0 0 0 0 0 0 0 1 0 0 felsitic, vitric
WD_36_24 tpr93 (Mussau type B) Admiralty Early Mussau Lapita (3250 - 2950 BP) 6 1 1 0 0 0 0 0 0 0 0 0 1 0 felsitic, vitric, chert
WD_37_2 tpr94 (Mussau type CD) Admiralty Early Mussau Lapita (3250 - 2950 BP) 0 1 2 1 0 6 0 0 0 0 0 1 0 0 felsitic, vitric
WD_37_6 tpr94 (Mussau type CD) Admiralty Late Mussau Lapita (2950 - 2700 BP) 3 1 1 1 0 5 0 0 0 0 0 1 0 0 felsitic, vitric

WD_31_14

ELS3 ELS3
Sherd ELS3 from Lasigi (New Ireland). Slide WD_31_14 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.

Hybrid (mixed terrigenous-calcareous) beach sand temper of anomalous composition unlikely to derive from anywhere on New Ireland or within the Bismarck Archipelago.


WD_36_17

ECA66_7_3 ECA66_7_3
Sherd ECA66-7-3 from Talepakemalai (Eloaua). Slide WD_36_17 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image or full slide in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Calcareous marginally hybrid (Type B).


WD_36_20

ECA67_6_23 ECA67_6_23
Sherd ECA67-6-23 from Talepakemalai (Eloaua). Slide WD_36_20 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.

Calcareous marginally hybrid (Type B).


WD_36_24

EHB1_4_19 EHB1_4_19
Sherd EHB1-4-19 from Etapakengaroasa (Emananus). Slide WD_36_24 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.

Calcareous marginally hybrid (Type B).


WD_37_2

ECA67_2_10 ECA67_2_10
Sherd ECA67-2-10 from Talepakemalai (Eloaua). Slide WD_37_2 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image or full slide in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Opaque rich placer sands (Type CD).


WD_37_6

ECA69_1_4 ECA69_1_4
Sherd ECA69-1-4 from Talepakemalai (Eloaua). Slide WD_37_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.

Opaque rich placer sands (Type CD).


Ceramic Wares

Late Far Western Lapita (2980 - 1800 BP)

Transitional Far Western (2350 - 1900 BP)

Middle Far Western Lapita (3050 - 2300 BP)

Early Mussau Lapita (3250 - 2950 BP)

Late Mussau Lapita (2950 - 2700 BP)