Neodymium and strontium isotopic and trace element composition of a Mesozoic CFB suite from Dronning Maud Land, Antarctica: implications for lithosphere and asthenosphere contributions to Karoo magmatism

Luttinen, Arto V.; Rämö, O. Tapani; Huhma, Hannu

doi:10.1016/s0016-7037(98)00184-7

Cited by 59 publications

(54 citation statements)

References 67 publications

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“…The Group 3 dikes that show the most radiogenic εNd (+9) and derive from least contaminated magmas exhibit relatively radiogenic initial 206 (Riley et al, 2005) shown at 180 Ma. Data for Vestfjella depleted (D-FP) and enriched (E-FP) ferropicrite suites (Heinonen and Luttinen, 2008;), Karoo CFBs (Ellam and Cox, 1989, 1991Harris et al, 1990;Hawkesworth et al, 1984;Jourdan et al, 2007;Luttinen and Furnes, 2000;Luttinen et al, 1998Luttinen et al, , 2010Riley et al, 2005;Sweeney et al, 1994), SWIR MORB (le Mahoney et al, 1992), and depleted MORB mantle (DMM; Workman and Hart, 2005) also presented. The isotopic compositions of SWIR MORB sources and DMM were back-calculated using DMM isotopic ratios after Workman and Hart (2005).…”

Section: Discussionmentioning

confidence: 99%

Subduction-modified oceanic crust mixed with a depleted mantle reservoir in the sources of the Karoo continental flood basalt province

Heinonen

Carlson

Riley

et al. 2014

Earth and Planetary Science Letters

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Section: Discussionmentioning

confidence: 99%

Subduction-modified oceanic crust mixed with a depleted mantle reservoir in the sources of the Karoo continental flood basalt province

Heinonen

Carlson

Riley

et al. 2014

Earth and Planetary Science Letters

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“…3b) generally ascribed to significant contribution from the underlying Precambrian basement and SCLM (e.g., Ellam 2006;Ellam andCox 1989, 1991;Harris et al 1990;Hawkesworth et al 1984;Jourdan et al 2007a;Luttinen and Furnes 2000;Luttinen et al 1998;Sweeney et al 1991Sweeney et al , 1994Neumann et al 2011). They have traditionally been divided into low-Ti and high-Ti provinces (e.g., Cox 1988;Sweeney et al 1994), but the geochemical and geochronological data are more compatible with a division into (1) ~182 Ma plateau-assemblage CFBs composed of relatively monotonous and widespread low-Ti tholeiites and (2) ~190-174 Ma rift-assemblage CFBs composed of diverse low-Ti and high-Ti basalts and picrites sandwiched between nephelinites and felsic volcanic rocks in the main triple rift ( Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…These dikes are rare but provide invaluable insight into the compositions of CFB magmas not influenced by the lithosphere and therefore provide compositional estimates of uncontaminated, asthenospherederived parental magmas. Second, the detailed mapping of the well-exposed Vestfjella CFBs (~flow-by-flow sampling of ~1-km-thick succession) have revealed four distinct CFB magma types that show a wide range of lithosphere-affinity trace element and isotopic compositions (ε Nd(t) 1 from −16 to +2; Luttinen et al 1998;Luttinen and Furnes 2000) nearly representing the whole degree of variation shown by the Karoo CFBs (Figs. 3b,4).…”

Section: Introductionmentioning

confidence: 99%

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Enriched continental flood basalts from depleted mantle melts: modeling the lithospheric contamination of Karoo lavas from Antarctica

Heinonen

Luttinen

Bohrson

2015

Contrib Mineral Petrol

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and partial melting of crustal wall rock and (2) assimilationfractional crystallization equations for lithospheric mantle contamination by using highly alkaline continental volcanic rocks (i.e., partial melts of mantle lithosphere) as contaminants. Calculations indicate that the different magma types can be produced by just minor (1-15 wt%) contamination of asthenospheric parental magmas by melts from variable lithospheric reservoirs. Our models imply that the role of continental lithosphere as a CFB source component or contaminant may have been overestimated in many cases. Thus, CFBs may represent major juvenile crustal growth events rather than just recycling of old lithospheric materials.

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“…1). The lavas and intrusive rocks can be geochemically divided into several groups, most of which show strong evidence of melt contribution from continental crust and/or lithospheric mantle (Furnes et al, 1987;Harris et al, 1990Harris et al, , 1991Luttinen et al, 1998Luttinen et al, , 20102015;Luttinen and Furnes, 2000;Riley et al, 2005). Some of the magma types show geochemical similarities with the larger Karoo CFB formations found on the African side of the Jurassic rift system (e.g., Luttinen and Furnes, 2000;Riley et al, 2005).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Crystallisation temperatures of the most Mg-rich magmas of the Karoo LIP on the basis of Al-in-olivine thermometry

2015

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Calculating reliable temperatures of Mg-rich magmas is problematic because melt composition and K D (Fe-Mg) ol-liq , the key parameters of many traditional thermometers, are difficult to constrain precisely. The recently developed Al-in-olivine thermometer [Coogan, L.A., Saunders, A.D., Wilson, R.N., 2014. Aluminum-in-olivine thermometry of primitive basalts: Evidence of an anomalously hot mantle source for large igneous provinces. Chemical Geology 368, 1-10] circumvents these problems by relying on the temperature-dependent exchange of Al between olivine and spinel crystallising in equilibrium with each other. This thermometer is used to reevaluate the crystallisation temperatures of the most Mg-rich magma type identified from the Karoo large igneous province (LIP), known as the Vestfjella depleted ferropicrite suite. Previous temperature estimates for the suite were based on olivine-melt equilibria and indicated anomalously high crystallisation temperatures in excess of 1600 °C. We also present crystallisation temperatures for another Antarctic Karoo magma type, Group 3 dykes from Ahlmannryggen, which are derived from a pyroxene-rich mantle source. Our high-precision analysis of Al in olivine-spinel pairs indicate crystallisation temperatures from 1391±42 °C to 1481±35 °C for the Vestfjella depleted ferropicrite suite ) and from 1253±64 °C to 1303±40 °C for the Group 3 dykes ). Although the maximum temperature estimates for the former are over 100 °C lower than the previously presented estimates, they are still ~200 °C higher than those calculated for mid-ocean ridge basalts using the same method. Although exact mantle potential temperatures are difficult to estimate, the presented results support elevated sub-Gondwanan upper mantle temperatures (generated by a mantle plume or internal mantle heating) during the generation of the Karoo LIP.

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Neodymium and strontium isotopic and trace element composition of a Mesozoic CFB suite from Dronning Maud Land, Antarctica: implications for lithosphere and asthenosphere contributions to Karoo magmatism

Cited by 59 publications

References 67 publications

Subduction-modified oceanic crust mixed with a depleted mantle reservoir in the sources of the Karoo continental flood basalt province

Subduction-modified oceanic crust mixed with a depleted mantle reservoir in the sources of the Karoo continental flood basalt province

Enriched continental flood basalts from depleted mantle melts: modeling the lithospheric contamination of Karoo lavas from Antarctica

Crystallisation temperatures of the most Mg-rich magmas of the Karoo LIP on the basis of Al-in-olivine thermometry

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