Sample PR 4-93

NavDat sample number 42409 · GRANITE

Sample

Sample ID	PR 4-93
Rock name	GRANITE
Rock type	PLUTONIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	38.1232
Longitude	-122.878
State / province	California
Location comment	biotite granite of Tomales Bay

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
82		73.8	90.2

Analyses

WHOLE ROCK

Item	Value	Std. dev.	Unit	Method
RB	101		PPM	EDXRF
SR	99.5		PPM	EDXRF
RB_SR	1.01			MS
RB87_SR86	2.924			MS
SR87_SR86	0.71221			MS
SR87_SR86_INITIAL	0.70863			MS
RB	205.4		PPM	MS-ID
SR	107.7		PPM	MS-ID
RB_SR	1.908			MS-ID
RB87_SR86	5.524			MS-ID
SR87_SR86	0.71489			MS
SR87_SR86_INITIAL	0.70863			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.