Sample HG-42

NavDat sample number 31300 · ANDESITE

Sample

Sample ID	HG-42
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	Porphyritic andesite with microphenocrysts of plagioclase and augite and xenocryst s of quartz in a pilotaxtic to hyalopilitic groundmass similar in composition to HG-40. The sample contains partially to tatally resorbed plagioclase.

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

Item	Value	Unit	Method
SIO2	61.89	WT%	XRF
TIO2	0.9	WT%	XRF
AL2O3	16.98	WT%	SRC AND AAS
FEO	6.05	WT%	XRF
MNO	0.09	WT%	XRF
MGO	3.54	WT%	SRC AND AAS
CAO	5.32	WT%	XRF
NA2O	3.78	WT%	SRC AND AAS
K2O	1.9	WT%	XRF
P2O5	0.21	WT%	XRF
TOTAL	100.66	WT%	XRF
RB	67	PPM	XRF
SR	363	PPM	XRF
Y	33	PPM	XRF
ZR	178	PPM	XRF
BA	599	PPM	XRF
V	121	PPM	XRF
CR	109	PPM	XRF
NI	28	PPM	XRF
SR87_SR86	0.704294		ICPMS