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Mineralogy and Petrology

, Volume 112, Supplement 2, pp 519–537 | Cite as

Insights into the petrogenesis of the West Kimberley lamproites from trace elements in olivine

  • A. Lynton JaquesEmail author
  • Stephen F. Foley
Original Paper

Abstract

The Miocene lamproites of the West Kimberley region, Western Australia include olivine-leucite lamproites (≤10 wt% MgO) containing olivine and leucite microphenocrysts, and diamondiferous olivine lamproites (20–30 wt% MgO) containing olivine phenocrysts and larger (1–10 mm) olivine as mantle xenocrysts and dunite micro-xenoliths. Olivine phenocrysts and thin (<100 μm) magmatic rims define trends of decreasing Cr and Ni, and increasing Ca and Mn, with decreasing olivine Mg#, consistent with fractional crystallisation of olivine (and minor chromite). Many phenocrysts are zoned, and those with cores of similar Mg# and trace element abundances to the mantle xenocrysts may be xenocrysts overgrown by later olivine crystallised from the lamproite magma. Magmatic olivines Mg#91–92 are estimated to have been in equilibrium with olivine lamproite magma(s) containing ~22–24 wt% MgO. The xenocrystic mantle olivines Mg90–92.5 in the olivine lamproites are inferred from trace element abundances to be mostly derived from garnet peridotite with equilibration temperatures estimated from the Al-in-olivine thermometer (Bussweiler et al. 2017) to be ~1000–1270 °C at depths of 115–190 km. Olivines from the deeper lithosphere are less depleted (lower Mg#, higher Na, Al, P, Ti, Zr etc) than those at shallower depths, a feature suggested to reflect the combined effects of metasomatic re-enrichment of the craton roots (Ti, Fe, Zr etc) and increasing temperature with depth of origin (Na, Al, Ca). The West Kimberley lamproite olivines are not enriched in Li, as might be expected if their source regions contained continental sedimentary material as has been previously inferred from lamproite large-ion-lithophile trace elements, and Sr and Pb isotopes.

Keywords

Lamproite Olivine Mantle West Kimberley Trace elements 

Notes

Acknowledgements

We thank Robert Rapp (ANU) for the X-ray maps and for assistance with the EPMA analyses, and James Tolley and Patrick Goodarzi (ANU) and Peter Tolland (formerly ANU) for assistance with the LA-ICP-MS analyses. Geoscience Australia kindly provided the geological map. Karol Czarnota (Geoscience Australia) drew our attention to the conductivity anomaly in the West Kimberley region. We thank two anonymous reviewers for their constructive reviews that significantly improved the manuscript and guest editor Phil Janney for his handling of the manuscript. ALJ acknowledges the support of Australian Research Council Grants DP140103841 and DP140101976 in undertaking the study.

Supplementary material

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Authors and Affiliations

  1. 1.Research School of Earth SciencesAustralian National UniversityActonAustralia
  2. 2.ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and Department of Earth and Planetary SciencesMacquarie UniversityNorth RydeAustralia

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