Uppermost mantle anisotropy beneath the southern Laurentian margin: Evidence from Knippa peridotite xenoliths, Texas

Takako Satsukawa*, Katsuyoshi Michibayashi, Urmidola Raye, Elizabeth Y. Anthony, Jay Pulliam, Robert Stern

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Peridotite xenoliths from southern Texas consist of spinel lherzolite, harzburgite and minor dunite. Based on phase relations and temperature of equilibration, Knippa xenoliths come from the uppermost mantle, 40-70 km deep. Knippa xenoliths provide rare snapshots of upper mantle processes and compositions beneath south-central Laurentia. They preserve olivine a-axis fiber fabrics with a strong concentration of [100] and girdles of [010] and [001]. Assuming a lithospheric mantle having a horizontal flow direction parallel to fast directions, the mantle lithospheric fabric revealed by the xenoliths mostly explains the magnitude of observed shear-wave splitting observed along the southern margin of the Laurentian craton.

Original languageEnglish
Article numberL20312
Pages (from-to)L20312-1-L20312-5
Number of pages5
JournalGeophysical Research Letters
Volume37
Issue number20
DOIs
Publication statusPublished - 1 Oct 2010
Externally publishedYes

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