Site: Lasigi

Island: New Ireland       Lithology: Composite high island ( Nunn et al. (2016) )

Lithology: Limestone ( Dickinson (2006) )

Lithology and Age: Cenozoic volcanic rocks ( Chorlton (2007) )       Macrostrat Geological Map Link

Near/In Geonames ID: 2092542       Wikidata ID: Q139659187       Getty Thesaurus of Geographic Names ID: None

Mindat Loc ID: None


In:

New Ireland Province Wikidata ID: Q838690

New Ireland Island Wikidata ID: Q215089

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


Fabrics:

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
tpr103 0 0 5 2 2 1 0 1 0 0 0 3 0 0 microphaneritic
New Ireland volcanic sand 0 0 5 2 2 1 0 0 0 0 0 2 0 0 Bismarck
tpr104 1 0 1 5 0 4 0 0 0 0 0 2 0 0 na
New Ireland pyroxenic placer 0 0 1 5 0 3 0 0 0 0 0 1 0 0 Bismarck
tpr105 6 0 0 0 0 0 0 0 0 0 0 0 0 0 na
New Ireland calcareous 6 0 0 0 0 0 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

Slides:

Slide Fabric Possible OriginWareCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_31_16 tpr103 (New Ireland volcanic sand) New Ireland Middle Far Western Lapita (3050 - 2300 BP) 0 0 5 2 2 1 0 0 0 0 0 2 0 0 microphaneritic
WD_31_17 tpr104 (New Ireland pyroxenic placer) New Ireland Middle Far Western Lapita (3050 - 2300 BP) 1 0 1 5 0 3 0 0 0 0 0 2 0 0 na
WD_31_19 tpr104 (New Ireland pyroxenic placer) New Ireland Middle Far Western Lapita (3050 - 2300 BP) 0 0 1 5 0 4 0 0 0 0 0 1 0 0 na
WD_31_13 tpr105 (New Ireland calcareous) New Ireland Middle Far Western Lapita (3050 - 2300 BP) 6 0 0 0 0 0 0 0 0 0 0 0 0 0 na
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_31_16

ELS5 ELS5
Sherd ELS5 from Lasigi (New Ireland). Slide WD_31_16 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.

Poorly sorted, fine-grained volcanic sands of likely stream (non-local) origin.


WD_31_17

ELS6 ELS6
Sherd ELS6 from Lasigi (New Ireland). Slide WD_31_17 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.

Well sorted, fine- to medium-grained placer beach sand, wholly lacking in hornblende, but rich in clinopyroxene and opaque iron oxides.


WD_31_19

ELS8 ELS8
Sherd ELS8 from Lasigi (New Ireland). Slide WD_31_19 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.

Well sorted, fine- to medium-grained placer beach sand, wholly lacking in hornblende, but rich in clinopyroxene and opaque iron oxides.


WD_31_13

ELS2 ELS2
Sherd ELS2 from Lasigi (New Ireland). Slide WD_31_13 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.

Almost exclusively calcareous temper sand with sparse subspherical hydrous iron oxide grains.


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.


References:

246 Lasigi, New Ireland, PNG, 2005 (Dickinson, W.)