Sample PH-4

NavDat sample number 31312 · ANDESITE

Sample

Sample ID	PH-4
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	Porphyritic/glomeroporphyritic andesite with phenocrysts of plagioclase, augite, and minor amounts of hypersthene and Fe-Ti oxides in a pilotaxitid groundmass composed of plagioclase, clinopyroxene, Fe-Ti oxides, and a small proportionof interstitial brown glass. Xenocrysts include plagioclase and rare orthopyroxene. Almost toatl resorption of quartz is seen as radially arranged clinopyroxene (augite) embedded in a pool of brown glass with local quartz remnants.

Age (Ma)	Error	Min	Max	Geologic age	Dated by
45.6		37.4	53.8

Item	Value	Unit	Method
SIO2	59.24	WT%	XRF
TIO2	1.33	WT%	XRF
AL2O3	16.34	WT%	SRC AND AAS
FEO	7.85	WT%	XRF
MNO	0.15	WT%	XRF
MGO	2.68	WT%	SRC AND AAS
CAO	5.73	WT%	XRF
NA2O	4.19	WT%	SRC AND AAS
K2O	1.65	WT%	XRF
P2O5	0.46	WT%	XRF
TOTAL	99.62	WT%	XRF
RB	5	PPM	XRF
SR	358	PPM	XRF
Y	41	PPM	XRF
ZR	270	PPM	XRF
BA	542	PPM	XRF
V	109	PPM	XRF
CR	48	PPM	XRF
NI	2	PPM	XRF
SR87_SR86	0.704237		ICPMS