Jurassic dikes of Vestfjella, western Dronning Maud Land, Antarctica: Geochemical tracing of ferropicrite sources

Heinonen, Jussi S.; Luttinen, Arto V.

doi:10.1016/j.lithos.2008.05.010

Cited by 49 publications

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“…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). Four intrusive magma types from western Dronning Maud Land show evidence of limited lithospheric interaction and derivation of the parental magmas from sublithospheric sources: 1) The Vestfjella depleted ferropicrite suite, 2) Vestfjella Low-Nb dykes, 3) The Vestfjella enriched ferropicrite suite, and 4) Ahlmannryggen Group 3 dykes (Riley et al, 2005;Heinonen and Luttinen, 2008;Luttinen et al, 2015). The first two originated from a common depleted (upper mantle) source Luttinen et al, 2015) and the latter two derive from distinct pyroxene-rich (recycled) mantle sources (Heinonen et al, , 2013(Heinonen et al, , 2014.…”

Section: Accepted M Manuscriptmentioning

confidence: 85%

“…Inputting the parental melt compositions and melting pressures (5-6 GPa) suggested for the depleted ferropicrite suite by to equations (3) and (4) Alternatively, T p can be calculated with the PRIMELT3 software (Herzberg and Asimow, 2015) which gives similar liquidus temperatures for sample AL/B1b-03 as suggested by the Al-inolivine thermometer (see section 5.2.). As with the equations of Putirka et al (2007), PRIMELT3 suggests high-degree melting of a garnet peridotite source (F = 31 %) for the parental melt of the sample AL/B1b-03, and the resulting T p is ~1630 °C (whole-rock composition of AL/B1b-03 used as an input; Heinonen and Luttinen, 2008).…”

Section: Accepted Manuscriptmentioning

confidence: 96%

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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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Section: Accepted M Manuscriptmentioning

confidence: 85%

Section: Accepted Manuscriptmentioning

confidence: 96%

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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“…%; FeO tot > 14 wt. %) have been described from Vestfjella (Heinonen and Luttinen, 2008 (Heinonen and Luttinen, 2008;Riley et al, 2005; cf. Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…In the Antarctic segment of the Karoo LIP ( Fig. 1), however, some primitive and nearly uncontaminated dike suites of sublithospheric geochemical character have been described (Heinonen and Luttinen, 2008;Luttinen and Furnes, 2000;Luttinen et al, 1998;Riley et al, 2005). At Ahlmannryggen, basaltic and picritic dikes crosscut the local Precambrian basement and have been sub-divided into four distinct geochemical groups (Groups 1-4; Riley et al, 2005).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Mixed pyroxenite–peridotite sources for mafic and ultramafic dikes from the Antarctic segment of the Karoo continental flood basalt province

Heinonen

Luttinen

Riley

et al. 2013

Lithos

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Please cite this article as: Heinonen, Jussi S., Luttinen, Arto V., Riley, Teal R., Michallik, Radoslaw M., Mixed pyroxenite-peridotite sources for mafic and ultramafic dikes from the Antarctic segment of the Karoo continental flood basalt province, LITHOS (2013), doi: 10.1016/j.lithos.2013.05.015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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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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Jurassic dikes of Vestfjella, western Dronning Maud Land, Antarctica: Geochemical tracing of ferropicrite sources

Cited by 49 publications

References 95 publications

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

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

Mixed pyroxenite–peridotite sources for mafic and ultramafic dikes from the Antarctic segment of the Karoo continental flood basalt province

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

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