Sample MON13-87

NavDat sample number 42447 · TONALITE

Sample

Sample ID	MON13-87
Rock name	TONALITE
Rock type	PLUTONIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	37.496
Longitude	-122.449
State / province	California
Location comment	south tonalite of Montara Mountain

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
18		89.84	90.8

Analyses

WHOLE ROCK

Item	Value	Std. dev.	Unit	Method
RB	55.9		PPM	EDXRF
SR	614		PPM	EDXRF
RB_SR	0.091			MS
RB87_SR86	0.263			MS
SR87_SR86	0.70669			MS
SR87_SR86_INITIAL	0.7064			MS
RB	349.1		PPM	MS-ID
SR	55.2		PPM	MS-ID
RB_SR	6.32			MS-ID
RB87_SR86	18.33			MS-ID
SR87_SR86	0.72871			MS
SR87_SR86_INITIAL	0.70634			MS
D18O	9.9		PERMILL	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.