USGS Certificate of Analysis Dolerite, DNC-1 (Geochemical Reference Standards)

Sample used in the preparation of this reference material was collected in 1968 from the Braggtown Quary near Durham, North Carolina. The material is one of the Triassic-Jurassic olivine-normative dolerites indigenous to the area (Ragland, et al., 1968).

Element concentrations were determined by cooperating laboratories using a variety of analytical methods. Certificate values are based primarily on USGS results (Flanagan, 1984) and international data compilations (Gladney and Roelandts, 1987, Govindaraju, 1994). USGS studies also provide background information on the sample collection site.

Recommended Values

Oxide	Wt %	±	Oxide	Wt %	±
SiO₂	47.15	0.21	Na₂O	1.89	0.057
Al₂O₃	18.34	0.17	K₂O	0.234	0.009
CaO	11.49	0.07	MnO	0.15	0.003
MgO	10.13	0.11	P₂O₅	0.07	0.005
FeO	7.32	0.06	TiO₂	0.48	0.007
Fe₂O₃	1.79	0.11	Fe₂O₃T	9.97	0.15

Element	µg/g	±	Element	µg/g	±
Ba	118	11	Sb	0.96	0.03
Co	57	2.2	Sc	31	1
Cr	270	8.5	Sr	144	1.8
Cu	100	2.6	V	148	8.3
Eu	0.59	0.03	Y	18	0.8
La	3.6	0.30	Yb	2	0.1
Li	5.2	0.29	Zn	70	2.4`
Nd	5.2	0.56	Zr	38	1
Ni	247	12

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Information Values

Element	µg/g	Element	µg/g
As	0.12	Ga	15
B	0.9	Gd	2
Be	1	Ho	0.62
Cl	60	Nb	3
Dy	3	Pb	6.3
F	66	Rb	4.5

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Certificate Information

Denver, Colorado
revised March 1995

David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)

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Bibliography

Flanagan, F.J., 1984, Three USGS Mafic Rock Reference Samples, W-2, DNC-1, and BIR-1: U.S. Geological Survey Bulletin 1623, p. 54.

Gladney, E.S., and Roelandts, I., 1988, 1987 Compilation of Elemental Concentration Data for USGS BIR-1, DNC-1, and W-2: Geostandards Newsletter, 12: 63-118

Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards: Geostandards Newsletter, 18:1-158

Ragland, P.C., Rogers, J.J.W., and Justus, P.S., 1968, Origin and Differentiation of Triassic Dolerite Magmans, North Carolina, USA: Contributions to Mineralogy and Petrology, vol. 20. no. 1, pp. 57-80.

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Glossary

Symbol	Definition
Fe₂O₃T	Total iron expressed as Fe₂O₃
C_tot	Total carbon concentration
S_tot	Total sulfur concentration
Wt %	Percent of total element concentration
µg/g	Total element concentration expressed as micrograms of element per gram of solid sample
±	One standard deviation

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Notes

Unless otherwise indicated total element concentrations are reported for material on an as-received basis, i.e., no drying.

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Order and Pricing Information

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U.S. Geological Survey
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