Sample DC-1C

NavDat sample number 31258 · DACITE

Sample

Sample ID	DC-1C
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	Glomeroporphyritic dacite with phenocrysts of plagioclase and hypersthene and minor microphenocrysts of Fe-Ti oxide. The orthpyroxene is commonly ophitic. Xenocrysts are sieve-textured clinopyroxene and orthpyroxene, sieve-textured plagioclase, and lesser resorbed quartz. Xenoliths include earlier volcanic rocks and gabbroic to noritic rocks.

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

Item	Value	Unit	Method
SIO2	63.64	WT%	XRF
TIO2	0.83	WT%	XRF
AL2O3	16.17	WT%	SRC AND AAS
FEO	5.63	WT%	XRF
MNO	0.1	WT%	XRF
MGO	2.62	WT%	SRC AND AAS
CAO	5.39	WT%	XRF
NA2O	3.87	WT%	SRC AND AAS
K2O	1.38	WT%	XRF
P2O5	0.15	WT%	XRF
TOTAL	99.78	WT%	XRF
RB	72	PPM	XRF
SR	288	PPM	XRF
Y	31	PPM	XRF
ZR	208	PPM	XRF
BA	668	PPM	XRF
V	85	PPM	XRF
CR	47	PPM	XRF
NI	11	PPM	XRF
SR87_SR86	0.704321		ICPMS