U.S. Geological Survey Certificate of Analysis

Dolerite, DNC-1

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 | Information Values | Certificate Information | Bibliography | Glossary | Notes | Order and Pricing Information


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
Ctot Total carbon concentration
Stot 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

Placing an Order

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Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964D
Denver, CO 80225
Tel: 303-236-2454
FAX: 303-236-3200 or 303-236-1425
Email: (swilson@usgs.gov)

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