Carbonatites From a Lamprophyric Dyke-Swarm, South Westland, New Zealand

Cooper, Alan F.; Paterson, Lorraine A.

doi:10.3749/canmin.46.4.753

Cited by 29 publications

(23 citation statements)

References 88 publications

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“…Moreover, our new age data suggest that the intensity of intraplate volcanism on Zealandia may have even increased during the period of compressional tectonics (i.e. since ∼ 22 Ma; Cooper et al, 1987;Cooper and Paterson, 2008;see Fig. 4), excluding major extensional tectonics as the controlling factor in generating Cenozoic intraplate volcanism on Zealandia.…”

Section: Evaluation Of Previously Proposed Models For the Origin Of Tmentioning

confidence: 99%

“…It ranges from nephelinite, basanite and carbonatite to phonolite and trachyte in composition (Cooper, 1986). Cooper et al (1987) and Cooper and Paterson (2008) proposed that these dikes intruded into tension fractures and Riedel shears at the initiation of the Alpine dextral wrench fault system. K/Ar whole-rock ages from the Alpine Dike Swarm suggest an unusually large age range of 14-846 Ma (Adams, 1980).…”

Section: Western South Islandmentioning

confidence: 99%

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Temporal and geochemical evolution of the Cenozoic intraplate volcanism of Zealandia

Timm¹,

Hoernle²,

Werner³

et al. 2010

Earth-Science Reviews

144

136

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Ar and geochemical (major and trace element and Sr-Nd-Hf-Pb isotope) data from offshore (Chatham Rise, Campbell and Challenger Plateaus) and onland (North, South, Auckland, Campbell, Chatham and Antipodes Islands of New Zealand) volcanism on Zealandia. The samples include nephelinite, basanite through phonolite, alkali basalt through trachyte/rhyolite, and minor tholeiite and basaltic andesite, all of which have ocean island basalt (OIB)-type trace element signatures and which range in age from 64.8 to 0.17 Ma. Isotope ratios show a wide range in composition (

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Section: Evaluation Of Previously Proposed Models For the Origin Of Tmentioning

confidence: 99%

Section: Western South Islandmentioning

confidence: 99%

Temporal and geochemical evolution of the Cenozoic intraplate volcanism of Zealandia

Timm¹,

Hoernle²,

Werner³

et al. 2010

Earth-Science Reviews

144

136

View full text Add to dashboard Cite

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“…Monazite is a major repository of REE in Haast carbonatites (Cooper and Paterson, 2008) and shows a range of REE distributions, from steep, La-enriched patterns to bell-shaped patterns enriched in Nd and depleted in both La-Ce and HREE. The degree of depletion in La/Nd was correlated with increasing Fe content of the carbonatite host, with Nd enrichment most pronounced in siderite-rich ferrocarbonatites.…”

Section: Monazitementioning

confidence: 99%

“…Although carbonatites constitute less than 1% by volume of intruded magma, they show a remarkable variability in carbonate assemblages, with calcite, dolomite, ankerite, siderite, norsethite, daqinshanite, strontianite, a Sr-Ca phase, a burbankite-like Ba-REE-Na phase, barytocalcite, and carbocernaitebearing varieties having been described (Cooper, 1971(Cooper, , 1986Cooper and Paterson, 2008;Paterson, 1993). This contribution describes an ancylite-bearing carbonatite (OU 81155), and explores the complex sequence of magmatic and carbo-hydrothermal processes associated with its crystallisation.…”

Section: Introduction/regional Geologymentioning

confidence: 97%

“…In the Alpine Dyke Swarm there are small volumes of carbonatite that induce pronounced fenitization effects on the host schists (Cooper, 1971(Cooper, , 1986Cooper and Paterson, 2008;Paterson, 1993). Although carbonatites constitute less than 1% by volume of intruded magma, they show a remarkable variability in carbonate assemblages, with calcite, dolomite, ankerite, siderite, norsethite, daqinshanite, strontianite, a Sr-Ca phase, a burbankite-like Ba-REE-Na phase, barytocalcite, and carbocernaitebearing varieties having been described (Cooper, 1971(Cooper, , 1986Cooper and Paterson, 2008;Paterson, 1993).…”

Section: Introduction/regional Geologymentioning

confidence: 98%

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Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand

Cooper

Collins

Palin

et al. 2015

Lithos

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Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Scott

Waight²,

Meer³

et al. 2014

Geochem. Geophys. Geosyst.

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There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time-integrated U/Pb (HIMU)-like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic mantle xenoliths from 25 localities across Zealandia permits the first comprehensive regional description of the subcontinental lithospheric mantle (SCLM) and insights into whether it could be a source to the intraplate basalts. Contrary to previous assumptions, the Oligocene-Miocene Zealandia SCLM is highly heterogeneous. It is composed of a refractory craton-like domain (West Otago) adjacent to several moderately fertile domains (East Otago, North Otago, Auckland Islands). Each domain has an early history decoupled from the overlying Carboniferous and younger continental crust, and each domain has undergone varying degrees of depletion followed by enrichment. Clinopyroxene grains reveal trace element characteristics (low Ti/Eu, high Th/U) consistent with enrichment through reaction with carbonatite. This metasomatic overprint has a composition that closely matches HIMU in Sr, Pb 6 Nd isotopes. However, clinopyroxene Hf isotopes are in part highly radiogenic and decoupled from the other isotope systems, and also mostly more radiogenic than the intraplate basalts. If the studied spinel facies xenoliths are representative of the thin Zealandia SCLM, the melting of garnet facies lithosphere could only be the intraplate basalt source if it had a less radiogenic Hf-Nd isotope composition than the investigated spinel facies, or was mixed with asthenosphere-derived melts containing less radiogenic Hf.

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Carbonatites From a Lamprophyric Dyke-Swarm, South Westland, New Zealand

Cited by 29 publications

References 88 publications

Temporal and geochemical evolution of the Cenozoic intraplate volcanism of Zealandia

Temporal and geochemical evolution of the Cenozoic intraplate volcanism of Zealandia

Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand

Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

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