Sample PR 1-90

NavDat sample number 42358 · GRANODIORITE

Sample

Sample ID	PR 1-90
Rock name	GRANODIORITE
Rock type	PLUTONIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	38.2273
Longitude	-122.989
State / province	California
Location comment	granodiorite of Tomales Point.

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
86.6		90.5	97.7

Analyses

WHOLE ROCK

Item	Value	Std. dev.	Unit	Method
RB	70.4		PPM	EDXRF
SR	512		PPM	EDXRF
RB_SR	0.137			MS
RB87_SR86	0.4			MS
SR87_SR86	0.70664			MS
SR87_SR86_INITIAL	0.70618			MS
RB	394.7		PPM	MS-ID
SR	21.7		PPM	MS-ID
RB_SR	18.21			MS-ID
RB87_SR86	53.02			MS-ID
SR87_SR86	0.77142			MS
SR87_SR86_INITIAL	0.70614			MS

References

Kistler, R W; Champion, D E (2001) Rb-Sr whole-rock and mineral ages, K-Ar, (super 40) Ar/ (super 39) Ar, and U-Pb mineral ages, and strontium, lead, neodymium, and oxygen isotopic compositions for granitic rocks from the Salinian Composite Terrane, California. Open-File Report - U. S. Geological Survey. 2001.