|
Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF)
JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 105, NO. B8,
PAGES 18,927–18,948,
2000
Cadmium, indium, tin, tellurium, and sulfur in oceanic basalts: Implications for chalcophile element fractionation in the
Earth
Wen Yi
Department of Geological Sciences, University of Michigan, Ann Arbor
Alex N. Halliday
Department of Geological Sciences, University of Michigan, Ann Arbor
Jeff C. Alt
Department of Geological Sciences, University of Michigan, Ann Arbor
Der-Chuen Lee
Department of Geological Sciences, University of Michigan, Ann Arbor
Mark Rehkämper
Department of Geological Sciences, University of Michigan, Ann Arbor
Michael O. Garcia
Department of Geology and Geophysics, University of Hawaii, Honolulu
C. H. Langmuir
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York
Yongjun Su
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York
Abstract
Concentrations of S, Cd, In, Sn, and Te are reported for 80 samples of mid-ocean ridge basalt (MORB), submarine and subaerial
ocean island basalt (OIB) and submarine arc lavas. Cadmium, In, and Sn are moderately incompatible, and Te is compatible during
partial melting. Cadmium is particularly uniform, consistent with a homogeneous distribution in the mantle. Tellurium is more
variable (1–6 ppb) and is notably higher in Loihi, ranging up to 29 ppb, the most likely explanation for which is accumulation
of Cu-bearing sulfide. The average Cd/Dy ratio is the same (0.027) for OIB glasses, MORB glasses and the continental crust,
yielding a primitive mantle Cd concentration of ∼18 ppb. Indium, despite being more volatile, is less depleted than Cd and
the other very volatile chalcophile elements Pb, Bi, Tl, and Hg. From the depletion of In we deduce that core formation depleted
the silicate Earth in Cd, Pb, Bi, Tl, and Hg by between factors of 5 and 10. The In depletion yields concentrations of C,
S, Se, and Te in the core of C ∼ 1.2%, S > 2.4%, Se > 7.1 ppm, and Te > 0.89 ppm. The Moon appears to be enriched in Te relative
to the silicate Earth. Either a significant fraction of the Moon was derived from a more Te-rich body or the silicate Earth's
inventory of chalcophile and siderophile elements was depleted by further terrestrial core growth after formation of the Moon.
Received 30
December
1998;
accepted 21
April
2000.
Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF)
Citation: Yi, W., A. N. Halliday, J. C. Alt, D.-C. Lee, M. Rehkämper, M. O. Garcia, C. H. Langmuir, and Y. Su
(2000),
Cadmium, indium, tin, tellurium, and sulfur in oceanic basalts: Implications for chalcophile element fractionation in the
Earth,
J. Geophys. Res.,
105(B8),
18,927–18,948.
Copyright 2000 by the American Geophysical Union.
|