上地幔Os同位素组成的演化

支霞臣; 秦协

Volume 31 Issue 1

Jan. 2006

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ZHI Xia-chen, QIN Xie, 2006. Evolution of Os Isotopic Compositions in the Upper Mantle. Earth Science, 31(1): 23-30.

Citation:

ZHI Xia-chen, QIN Xie, 2006. Evolution of Os Isotopic Compositions in the Upper Mantle. Earth Science, 31(1): 23-30.

ZHI Xia-chen, QIN Xie, 2006. Evolution of Os Isotopic Compositions in the Upper Mantle. Earth Science, 31(1): 23-30.

Citation:

ZHI Xia-chen, QIN Xie, 2006. Evolution of Os Isotopic Compositions in the Upper Mantle. Earth Science, 31(1): 23-30.

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Evolution of Os Isotopic Compositions in the Upper Mantle

Received Date: 2005-10-23
Publish Date: 2006-01-25

Abstract

Abstract

The Re-Os isotope system is a new technique of geochemical dating and tracing, specially in the basic subject of the composition-structure-evolution of the earth's mantle. The chondritic model of the evolution of Os isotope compositions in the upper mantle is the important background of Re-Os isotope dating for the mantle-derived materials, especially using Re depleted model age and Os proxy isochron methods. The comprehensive studies of various meteorites, mantle-derived peri-dotitic xenoliths and ophiolitic podiform chromites offered strong constraints on the evolution of Os isotope compositions in the convective upper mantle. We offer the Os isotope composition of convective upper mantle in the Late Archean, based on ophiolitic podiform chromitites from Zunhua, Hebei Province, which is 0. 110 2. This is consistent with the chondritic model. The parameters of the chondrite model in common use are: the initial osmium isotope ratio is 0. 095 31 at 4. 558 Ga; the present osmium isotope ratios are 0. 127 0 of carbonaceous chondrite and 0. 129 6 of the primitive upper mantle respectively. The latter is similar to that of ordinary and enstatite chondrites.
- convective upper mantle,
- Re-Os isotopes,
- chondritic model,
- ophiolitic podiform chromites,
- mantle xenoliths

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References(36)

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