U.S. Geological Survey Certificate of Analysis

Marine Sediment, MAG-1

MAG-1 is a fine grained gray-brown clayey mud with low carbonate content, from the Wilkinson Basin of the Gulf of Maine. The collection site was approximately 125 km east of Boston, Massachusetts. The age of the sediment is Holocene, but probably includes reworked Pleistocene sediment from surrounding areas.

Element concentrations were determined by cooperating laboratories using a variety of analytical methods. Certificate values are based primarily on international data compilations (Abbey, 1983, Gladney and Roelandts, 1988, Govindaraju, 1994). USGS reports (Flanagan, 1967, 1976) provide background information on this material.

Recommended Values | Certificate Information | Bibliography | Glossary | Notes


Element Wt % ± Oxide Wt % ±
Al2O3 16.4 0.30 MnO 0.098 0.009
CaO 1.37 0.10 Na2O 3.83 0.11
Fe2O3 T 6.80 0.60 P2O5 0.16 0.021
K2O 3.55 0.17 SiO2 50.4 0.96
MgO 3.00 0.10 TiO2 0.75 0.07
Element µg/g ± Element µg/g ± Element µg/g ±
B 140 6 F 770 80 Sb 0.96 0.1
Ba 480 41 Ga 20 1.5 Sc 17 1
Be 3.2 0.4 Gd 5.8 0.7 Sm 7.5 0.6
Cd 0.20 0.03 Hf 3.7 0.5 Sr 150 15
Ce 88 9 Ho 1.0 0.1 Tb 0.96 0.09
Cl 31000 600 La 43 4 Th 12 1
Co 20 1.6 Li 79 4 U 2.7 0.3
r 97 8 Lu 0.4 0.04 V 140 6
Cs 8.6 0.7 Nd 38 5 Y 28 3
Cu 30 3 Ni 53 8 Yb 2.6 0.3
Dy 5.2 0.3 Pb 24 3 Zn 130 6
Eu 1.6 0.14 Rb 150 6 Zr 130 13
Oxide Wt % Other Wt %
Fe2O3 3.49 H2O+ 5.6
FeO 3.06 H2O- 2.39
Stot 0.39
Ctot 2.15
Element µg/g Element µg/g Element µg/g
Ag 0.08 Er 3 Sn 3.6
As 9.2 Hg 0.02 Ta 1.1
Au 0.0024 I 380 Tm 0.43
Bi 0.34 Mo 1.6 W 1.4
Br 250 Nb 12

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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

Abbey, S., 1983, Studies in "Standard Samples" of Silicate Rocks and Minerals 1969-1982: Canadian Geological Survey Paper 83-15, p. 114.

Flanagan, F.J., 1967, U.S. Geological Survey silicate rock standards: Geochimica et Cosmoshimica Acta, 31:289-308.

Flanagan, F.J., 1976, Descriptions and Analyses of Eight New USGS Rock Standards: U.S. Geological Survey Professional Paper 840, 192 p.

Gladney, E.S., and Roelandts, I., 1987 Compilation of Elemental Concentration Data for USGS BHVO-1, MAG-1, QLO-1, RGM-1, SCo-1, SDC-1, SGR-1, and STM-1: Geostandards Newsletter, 12:253-362.

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

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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

This geochemical reference standard is no longer available.

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