Mantle xenolith perspectives.

P. H. Nixon, G. R. Davies

Research output: Chapter in Book / Report / Conference proceedingChapterAcademicpeer-review

Abstract

There are records of approx 3500 basaltic xenolith localities and a similar number of kimberlitic occurrences, although actual figures are much greater. The xenoliths group into: spinel-bearing peridotites from alkali basalts from oceanic, circum-oceanic, and young continental (rift) regions; spinel-garnet peridotites from peralkaline basaltic rocks in oceanic (plateau) and Phanerozoic-Proterozoic continental regions, and garnet peridotites together with shallower-seated xenoliths from kimberlitic intrusions in old continental (mainly cratonic) provinces. Xenoliths provide data on the constitution of the mantle, particularly beneath stable cratonic regions. Old events may be related to subduction, as indicated by eclogite suite xenoliths. A petrogenetic model for Group I kimberlites (with essentially an asthenospheric source) and Group II kimberlites including lamproites (essentially lithospheric) shows a paired relationship based on an ascending diapir with MORB-OIB characteristics. This results in early Group II lamproite eruptions from the lithosphere within its thermal aureole, followed by eruptions of Group I kimberlites when the diapir impinges on the base of the lithosphere. -J.M.H.

Original languageEnglish
Title of host publicationIn Nixon P.H. (ed) Mantle Xenoliths
Pages741-756
Number of pages16
Publication statusPublished - 1 Jan 1987

Fingerprint

xenolith
diapir
mantle
spinel
garnet
lithosphere
volcanic eruption
peralkaline rock
lamproite
aureole
ocean island basalt
alkali basalt
eclogite
Phanerozoic
mid-ocean ridge basalt
Proterozoic
subduction
plateau

Cite this

Nixon, P. H., & Davies, G. R. (1987). Mantle xenolith perspectives. In In Nixon P.H. (ed) Mantle Xenoliths (pp. 741-756)
Nixon, P. H. ; Davies, G. R. / Mantle xenolith perspectives. In Nixon P.H. (ed) Mantle Xenoliths. 1987. pp. 741-756
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Nixon, PH & Davies, GR 1987, Mantle xenolith perspectives. in In Nixon P.H. (ed) Mantle Xenoliths. pp. 741-756.

Mantle xenolith perspectives. / Nixon, P. H.; Davies, G. R.

In Nixon P.H. (ed) Mantle Xenoliths. 1987. p. 741-756.

Research output: Chapter in Book / Report / Conference proceedingChapterAcademicpeer-review

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