Magmatic haggertyite in olivine lamproites of the West Kimberley region, Western Australia

Jaques, A. L.; Brink, Frank; Jiang, Chen

doi:10.2138/am-2020-7456

Cited by 3 publications

(8 citation statements)

References 30 publications

(39 reference statements)

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“…Haggertyite occurs in the evolved groundmass a few olivine lamproites where it may take the place of or in some cases co-exist with ilmenite (Jaques et al, 2020). It is noteworthy that the presence of haggertyite in olivine-hosted melt inclusions in our samples provides additional support for the magmatic origin of this mineral in lamproites (Jaques et al, 2020). Phlogopite occurs as both microphenocrysts Fig.…”

Section: Paragenetic Sequence Of Ellendale Lamproitessupporting

confidence: 54%

“…A secondary origin associated with hydrothermal or late-stage deuteric alteration is suggested by the d 18 O-enriched composition of the vein-forming carbonate. Similarly, in the case of the Walgidee Hills lamproite (Western Australia), calcite veins located within the centre of the intrusion are interpreted to be the result of late-stage carbonate-rich deuteric or hydrothermal alteration (Jaques et al, 2020). Carbonate is also present in the Sisimiut (Greenland; Thy et al, 1987;Larsen and Rex, 1992) and Aillik Bay (Canada; Tappe et al, 2007) lamproites, which are located on opposite sides of the Labrador Sea from each other.…”

Section: Melt Inclusions and Their Implications For Lamproite Melt Co...mentioning

confidence: 99%

“…The petrographic relationships and the relative sequence of included minerals in the zoned coarse-grained to pegmatitic Walgidee Hills lamproite suggests the paragenetic sequence for the major and minor crystallising silicate and titanate phases in the West Kimberley lamproites was likely olivine -Cr-spinel -diopside -perovskite -leucite -phlogopite -apatite -wadeite -priderite -ilmenite -titanian potassium richterite -sanidinejeppeite -noonkanbahite (Jaques, 2017). Haggertyite occurs in the evolved groundmass a few olivine lamproites where it may take the place of or in some cases co-exist with ilmenite (Jaques et al, 2020). It is noteworthy that the presence of haggertyite in olivine-hosted melt inclusions in our samples provides additional support for the magmatic origin of this mineral in lamproites (Jaques et al, 2020).…”

Section: Paragenetic Sequence Of Ellendale Lamproitesmentioning

confidence: 99%

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Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

et al. 2022

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Section: Paragenetic Sequence Of Ellendale Lamproitessupporting

confidence: 54%

Section: Melt Inclusions and Their Implications For Lamproite Melt Co...mentioning

confidence: 99%

Section: Paragenetic Sequence Of Ellendale Lamproitesmentioning

confidence: 99%

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Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

et al. 2022

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“…1989;Taylor 2008), the ~800 Ma Maude Creek kimberlite and the ~815 Ma Bow Hill 128 ultramafic lamprophyre (UML) dykes in the East Kimberley (Fig. 1; Jaques et al 1986;129 Pidgeon et al 1989;Fielding and Jaques 1989). An earlier unpublished U-Th-Pb SHRIMP 130 perovskite age of 849±13 Ma (Downes et al 2016) identified the Mad Gap Yards UML 131 dykes as being part of this Neoproterozoic alkaline magmatic province.…”

Section: Response To Reviewersmentioning

confidence: 99%

“…The Argyle lamproite, associated lamproite dykes and the Bow Hill 169 ultramafic lamprophyre dykes were emplaced along a terrane boundary within the Halls 170 Creek Orogen during the Proterozoic (Fig. 1; Jaques et al 1986;Jaques and Milligan 2004). 171…”

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confidence: 99%

Perovskite geochronology and petrogenesis of the Neoproterozoic Mad Gap Yards ultramafic lamprophyre dykes, East Kimberley region, Western Australia

Downes

Jaques

Talavera

et al. 2023

Contrib Mineral Petrol

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The Mad Gap Yards ultramafic lamprophyre (UML) dykes in the East Kimberley region of northern Western Australia form part of a widespread Neoproterozoic (~842-800 Ma) alkaline mafic-ultramafic magmatic province in the north, east and central regions of the Kimberley Craton of Western Australia. The NE-trending Mad Gap Yards dykes lie at the southeastern margin of the Kimberley Basin adjacent to the Greenvale Fault and intrude the Paleoproterozoic Elgee Siltstone. The dykes are classified as alnöite, and contain abundant macrocrystic olivine in a groundmass of phlogopite, perovskite, spinels, diopside, apatite, andradite-hydroandradite, serpentine, calcite, pseudomorphs after melilite and rare gittinsite. Mantle-derived olivine macrocrysts have compositions in the range Mg#91-92, similar to moderately refractory peridotite from other parts of the Kimberley Craton, whereas magmatic olivine phenocrysts have Mg#88-90. Olivine and chromian spinel were the earliest phenocrysts; they record equilibration temperatures of ~1030-920˚C under moderately reducing conditions with fO2 values below the fayalite-magnetite-quartz (FMQ) oxygen buffer (Δ FMQ = mostly -0.8 to -1.7 log units). Magnetite rims and groundmass grains crystallised at ~850-740˚C under more oxidising conditions with Δ FMQ ~+0.6 to -0.75 log units. Perovskite is well preserved in parts of the dykes and indicates crystallisation inside this fO2 range. The perovskite yielded a SHRIMP 206Pb/238U age of 842±8 Ma. The Mad Gap Yards dykes carry rare partially-altered spinel peridotite xenoliths containing olivine (Mg#86.3-90), Cr-diopside, enstatite and Al-Cr spinel, and well as

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Petrology, Geochemistry and Mantle Minerals of the Walgidee Hills Lamproite, West Kimberley, Western Australia

Jaques

2024

Journal of Petrology

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The 17.44 Ma Walgidee Hills lamproite in the West Kimberley province of Western Australia is the type locality for several K-, Ba- and Ti-rich minerals characteristic of lamproites and, at 490 ha, the largest known lamproite. The Walgidee Hills pipe comprises a thin sequence of tuffs and breccia formed by explosive eruptions that excavated a large shallow crater that was infilled by lamproite magma which cooled and crystallised in situ. The lamproite is zoned in grain size, mineralogy, and mineral and rock composition from porphyritic olivine lamproite at the margin through medium grained lamproite comprised of olivine (altered), titanian phlogopite, diopside, leucite (altered) and titanian potassic richterite to coarse gained lamproite rich in potassic richterite, priderite, jeppeite, perovskite, apatite, wadeite and noonkanbahite at the centre of the body. Compositional zoning is evident across the lamproite in phlogopite (to lower Mg and Al, higher Fe), potassic richterite (to higher Fe and Na, lower Ti), priderite (to lower Cr) and perovskite (to lower Cr and Fe, higher Na, Sr, Y, Nb, U, REE). The Walgidee Hills lamproite is ultrapotassic and ranges from olivine lamproite (up to ~21 wt % MgO, ~800 μg/g Ni, ~4 wt % K2O) to sanidine/leucite-rich lamproite (~7 wt % MgO, ≤100 μg/g Ni, ~7 wt % K2O) at the centre of the pipe. The lamproite has low Al2O3, total Fe, Na2O and CaO (except for intensely carbonate-veined rocks at the centre) and is highly enriched in TiO2 (3−6.5 wt %), Ba, Rb, Sr, Zr and LREE (LaN = 150−520 x primitive mantle). A transect and geochemical contours show MgO, Ni and Cr contents decrease and P, K, Ti, Fe, Rb, Sr, Y, Zr, Nb, REE, Hf, Pb, Th and U abundances increase inwards to the most evolved rocks at the centre of the pipe, consistent with fractionation by inwards in situ crystallisation. The parent magma is estimated from the composition of the porphyritic olivine lamproite at the margins of the pipe to have ~16 ± 1 wt % MgO, ~600 μg/g Ni, ~6 wt % K2O with La/Yb ~ 150. Modelling suggests that the most MgO-rich lamproites result from entrainment of ~15–20 wt % mantle olivine in the parent magma. Cooling of the magma resulted in fractional crystallisation of olivine and in situ crystallisation with the evolved coarse-grained lamproites at the centre of the pipe crystallised from residual magma enriched in the more incompatible elements. Mantle xenocrysts include abundant Cr-Al spinel, chrome diopside, chrome pyrope, and rare diamond. Thermobarometry on the Cr diopside xenocrysts defines a cold paleogeotherm of ~38 mW/m2 and a thick lithosphere (~235 km) extending from the Kimberley craton. Many of the Cr diopsides from the deeper lithospheric mantle are enriched in K, Ba and LREE and these, and the Ti-rich spinel xenocrysts, are inferred to be derived from metasomatised mantle peridotite. The enriched trace element and Sr-Nd-Pb isotopic signatures of the Walgidee Hills lamproite suggest derivation from or extensive incorporation of ancient formerly depleted lithospheric mantle that has undergone metasomatism and long term (≥2 Ga) geochemical enrichment including by melts from Paleoproterozoic subducted crust.

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Magmatic haggertyite in olivine lamproites of the West Kimberley region, Western Australia

Cited by 3 publications

References 30 publications

Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

Carbon compounds in the West Kimberley lamproites (Australia): Insights from melt and fluid inclusions

Perovskite geochronology and petrogenesis of the Neoproterozoic Mad Gap Yards ultramafic lamprophyre dykes, East Kimberley region, Western Australia

Petrology, Geochemistry and Mantle Minerals of the Walgidee Hills Lamproite, West Kimberley, Western Australia

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