Sample PR 3-90

NavDat sample number 42360 · NOT-GIVEN

Sample

Sample ID	PR 3-90
Rock name	NOT-GIVEN
Rock type	PLUTONIC
Composition	MAFIC
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
85.5		76.95	94.05

Analyses

WHOLE ROCK

Item	Value	Std. dev.	Unit	Method
RB	137		PPM	EDXRF
SR	553		PPM	EDXRF
RB_SR	0.248			MS
RB87_SR86	0.72			MS
SR87_SR86	0.70705			MS
SR87_SR86_INITIAL	0.70618			MS
RB	427.2		PPM	MS-ID
SR	20.2		PPM	MS-ID
RB_SR	21.16			MS-ID
RB87_SR86	61.65			MS-ID
SR87_SR86	0.78105			MS
SR87_SR86_INITIAL	0.70618			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.