Site: Tarague

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

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

Near/In Geonames ID: 4038671       Wikidata ID: Q25192567       Getty Thesaurus of Geographic Names ID: None

Mindat Loc ID: None


In:

Guam Island Wikidata ID: Q16635

Mariana Islands Wikidata ID: Q153732

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
tpr18 4 0 2 5 0 2 0 0 0 0 0 3 0 0 vitric, felsitic
Guam hybrid 2 0 1 3 0 1 0 0 0 0 0 2 0 0 Marianas
tpr20 0 0 3 3 0 3 0 0 0 0 0 6 0 0 vitric, microlitic
Guam lithic andesiitic 0 0 1 1 0 1 0 0 0 0 0 5 0 0 Marianas
tpr21 0 0 2 2 0 2 0 0 0 0 0 6 0 0 vitric, microlitic
Guam lithic hi andesitic 0 0 1 1 0 1 0 0 0 0 0 6 0 0 Marianas

Slides:

Slide Fabric Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_8_12 tpr18 (Guam hybrid) Guam 2 0 1 5 0 1 0 0 0 0 0 2 0 0 vitric, microlitic
WD_8_14 tpr20 (Guam lithic andesiitic) Guam 0 0 2 2 0 1 0 0 0 0 0 5 0 0 microlitic, vitric
WD_8_16 tpr20 (Guam lithic andesiitic) Guam 0 0 2 2 0 1 0 0 0 0 0 6 0 0 microlitic, vitric
WD_8_9 tpr21 (Guam lithic hi andesitic) Guam 0 0 2 1 0 2 0 0 0 0 0 6 0 0 microlitic, vitric

WD_8_12

Tarague_71_5 Tarague_71_5
Sherd 71-5 from Tarague (Guam). Slide WD_8_12 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 beach sand temper in which calcareous reef detritus is admixed with terrigenous grains derived from volcanic rocks.


WD_8_14

Tarague_72_1 Tarague_72_1
Sherd 72-1 from Tarague (Guam). Slide WD_8_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.

Poorly sorted volcanic sand temper rich in glassy volcanic rock fragments characteristic of indigenous Guam tempers.


WD_8_16

Tarague_72_3 Tarague_72_3
Sherd 72-3 from Tarague (Guam). Slide WD_8_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 volcanic sand temper rich in glassy volcanic rock fragments characteristic of indigenous Guam tempers.


WD_8_9

Tarague_71_2 Tarague_71_2
Sherd 71-2 from Tarague (Guam). Slide WD_8_9 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 volcanic sand temper rich in glassy volcanic rock fragments characteristic of indigenous Guam tempers.


References:

208 Tarague, Guam, 2002 (Dickinson, W.)