Refertilization of Jurassic oceanic peridotites from the Tethys Ocean — Implications for the Re–Os systematics of the upper mantle
- 作者：David van Acken ; Harry Becker ; Richard J. Walker
- 关键词：Re/Os ; mantle ; peridotites ; pyroxenites ; ultramafic massif ; refertilization
- 刊名：Earth and Planetary Science Letters
- 出版年：2008
- 期刊代码：18_0012821x
- 类别：ph
- 出版时间：15 April 2008
- 卷：268
- 期：1-2
- 页码：171-181
- 文件大小：408 K
摘要
The influence of melt migration and solid state mixing of pyroxenites on Re–Os isotopic and major element systematics of oceanic mantle rocks have been studied in serpentinized spinel lherzolites and associated spinel and spinel–garnet pyroxenite layers from the Totalp ultramafic massif near Davos (eastern Swiss Alps). The ultramafic body originally was emplaced and serpentinized on the Jurassic Liguria–Piedmont ocean floor and was little modified during the Alpine orogeny. Field and petrographic observations indicate that refertilization of the peridotites occurred by migration of melt between abundant websterite layers and the peridotites, as well as by mechanical stretching and thinning of websterite layers down to the subcentimeter scale, thus producing fertile lherzolite compositions.