Site: Ambitle

Island: Ambitle       Lithology: Volcanic high island ( Nunn et al. (2016) )

Lithology and Age: None ( Chorlton (2007) )       Macrostrat Geological Map Link

Near/In Geonames ID: 2100952       Wikidata ID: Q457596       Getty Thesaurus of Geographic Names ID: 283601

Mindat Loc ID: 312314


In:

New Ireland Province Wikidata ID: Q838690

Feni Group Wikidata ID: Q1401407


Volcanoes:

Feni: Phono-tephrite / Tephri-phonolite, Composite type, Stratovolcano.

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
tpr134 1 0 2 5 1 4 2 0 0 0 0 3 0 0 microlitic
TLTF olivine placer 0 0 0 4 0 2 1 0 0 0 0 1 0 0 Bismarck
tpr178 0 1 4 3 2 3 0 0 0 0 0 4 0 0 microlitic
Bismarck pyroxenic 0 0 3 2 2 2 0 0 0 0 0 4 0 0 Bismarck
tpr179 0 0 5 1 1 0 0 0 0 0 0 4 0 0 felsitic, lathwork
Bismarck feldspathic 0 0 5 1 1 0 0 0 0 0 0 4 0 0 Bismarck
tpr180 0 0 2 1 1 2 0 0 0 0 0 6 0 0 vitric, microlitic
Bismarck lithic 0 0 2 1 1 2 0 0 0 0 0 6 0 0 Bismarck

Slides:

Slide Fabric Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_102_1 tpr134 (TLTF olivine placer) TLTF or New Britain 0 0 2 5 1 2 1 0 0 0 0 2 0 0 microlitic
WD_102_2 tpr178 (Bismarck pyroxenic) Anir 0 1 3 2 2 3 0 0 0 0 0 4 0 0 microlitic
WD_102_4 tpr178 (Bismarck pyroxenic) Anir 0 0 4 3 2 2 0 0 0 0 0 4 0 0 microlitic
WD_102_3 tpr179 (Bismarck feldspathic) Anir 0 0 5 1 1 0 0 0 0 0 0 4 0 0 felsitic, lathwork
WD_102_5 tpr180 (Bismarck lithic) Anir 0 0 2 1 1 2 0 0 0 0 0 6 0 0 vitric, microlitic

WD_102_1

AnirL4 AnirL4
Sherd AnirL4 from Ambitle (Ambitle). Slide WD_102_1 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.

Non-Lapita. Well sorted, subrounded to subangular aggreates that are probably beach sands Olivine and hornblende present. Has orthopyroxene in addition to the more abundant clinopyroxene. Microlitics are hyalopilitic.


WD_102_2

AnirL5 AnirL5
Sherd AnirL5 from Ambitle (Ambitle). Slide WD_102_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.

Non-Lapita. Moderately sorted, subangular to subrounded aggregates, probably stream sands. Microlitic volcanic rock fragments are hyalopilitic.


WD_102_4

AnirL7 AnirL7
Sherd AnirL7 from Ambitle (Ambitle). Slide WD_102_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.

Non-Lapita. Moderately sorted, subangular to subrounded aggregates, probably stream sands. Microlitic lithics are hyalopilitic.


WD_102_3

AnirL6 AnirL6
Sherd AnirL6 from Ambitle (Ambitle). Slide WD_102_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.

Non-Lapita. Well sorted, subrounded to subangular aggreates that are probably beach sands. Volcanic rocks are felsitic (microcrystalline quartz-feldspar groundmass mosaic commonly with plagioclase microphenocrysts).


WD_102_5

AnirL8 AnirL8
Sherd AnirL8 from Ambitle (Ambitle). Slide WD_102_5 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.

Non-Lapita. Vitric glass. Well sorted, subrounded to subangular aggreates that are probably beach sands. Microlitic lithics are hyalopilitic.


References:

043 Anir, Solomon 1972 (Dickinson, W.)

200 Kamgot, Ambitle, Fani, PNG, 2000 (Dickinson, W.)