Sample COBA3-90-2P

NavDat sample number 42420 · PEGMATITE

Sample

Sample ID	COBA3-90-2P
Rock name	PEGMATITE
Rock type	PLUTONIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	37.9969
Longitude	-123.385
State / province	California
Location comment	tonalite, granodiorite, and aplite-pegmatite cobbles dredged from Cordell Bank

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
95		85.5	104.5

Analyses

WHOLE ROCK

Item	Value	Std. dev.	Unit	Method
RB	120		PPM	EDXRF
SR	163		PPM	EDXRF
RB_SR	0.738			MS
RB87_SR86	2.135			MS
SR87_SR86	0.70784			MS
SR87_SR86_INITIAL	0.705			MS
RB	155.2		PPM	MS-ID
SR	244.4		PPM	MS-ID
RB_SR	0.635			MS-ID
RB87_SR86	1.837			MS-ID
SR87_SR86	0.70773			MS
SR87_SR86_INITIAL	0.7052			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.