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Zartman & Tera 1973
Zartman, R.E. and Tera, F. (1973). Lead concentration and isotopic composition in five peridotite inclusions of probable mantle origin*1. Earth and Planetary Science Letters 20(1): 54-66.
The lead content of five whole-rock peridotite inclusions (four lherzolites and one harzburgite) in alkali basalt ranges from 82 to 570 ppb (parts per billion). Approximately 30-60 ppb of this amount can be accounted for by analyzed major silicate minerals (olivine 206Pb/204Pb = 18.01-18.90; 207Pb/204Pb = 15.52-15.61; 208Pb/204Pb = 37.80-38.86) lies within the range of values defined by many modern volcanic rocks and, in particular, is essentially coextensive with the abyssal tholeiite field. In all but one instance, isotopic differences were found between the peridotite and its host alkali basalt. Two of the peridotites clearly demonstrated internal isotopic heterogeneity between leachable and residual fractions that could not simply be due to contamination by the host basalt. However, there is no evidence that these ultramafic rocks form some layer in the mantle with isotopic characteristics fundamentally different from those of the magma sources of volcanic rocks.
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Abstract
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Analytical Method
Journal
Earth and Planetary Science Letters
http://www.elsevier.com/wps/product/cws_home/503328
Publisher
Elsevier Science
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The Netherlands
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