Isotopic and Trace Element Geochemistry of the Kiglapait Intrusion, Labrador: Deciphering the Mantle Source, Crustal Contributions and Processes Preserved in Mafic Layered Intrusions

Fourny, Anaïs; Weis, Dominique; Scoates, James S.

doi:10.1093/petrology/egz006

Cited by 16 publications

(3 citation statements)

References 136 publications

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“…Similarly, the~8 km thick Metoproterozoic Kiglapait Intrusion in Labrador is thought to have crystallized as a closed system from a single batch of magma (Morse 1969(Morse , 1979(Morse , 2015Fourny et al 2019). Crystallization within the Kiglapait intrusion begins with troctolite formation via the settling of Mg-rich olivine and Ca-rich plagioclase at the bottom of the intrusion (Morse 2015;Fourny et al 2019). Fractionation within the closed system continued and resulted in silica-and alkali-rich ferrosyenite near the top of the intrusion (Morse 2015;Fourny et al 2019).…”

Section: Possible Earth Analogs For Chassignitesmentioning

confidence: 99%

“…Crystallization within the Kiglapait intrusion begins with troctolite formation via the settling of Mg-rich olivine and Ca-rich plagioclase at the bottom of the intrusion (Morse 2015;Fourny et al 2019). Fractionation within the closed system continued and resulted in silica-and alkali-rich ferrosyenite near the top of the intrusion (Morse 2015;Fourny et al 2019). The world's largest known layered intrusion, the Paleoproterozoic Bushveld Complex, is a product of multiple major incoming pulses of petrogenetically related magma (Eales 2002).…”

Section: Possible Earth Analogs For Chassignitesmentioning

confidence: 99%

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Melt inclusions in chassignite NWA 2737: A link between processes recorded in Martian meteorites and rocks at Gale crater

Gazel

Udry

et al. 2021

Meteorit & Planetary Scien

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Northwest Africa (NWA) 2737, one of the only three discovered Martian chassignites, provides critical constraints on the evolution of the Martian mantle and crust. Because of chassignites' cumulative nature, they contain abundant melt inclusions (MI). MI are small droplets of melts trapped by crystals during the cooling of magma. They are critical to the study of pre-eruptive parental magma compositions, and thus, provide snapshots of the composition and evolution of Martian magmatic systems. Here, we present fractional crystallization models using parental magma composition calculated from NWA 2737 melt inclusions as starting compositions. We used the thermodynamic modeling software MELTS to model fractional crystallization of NWA 2737 parental magma compositions with a wide range of parameters (pressure, water content, oxygen fugacity). Our models show that the felsic compositions recently analyzed at the Martian surface in Gale crater, especially Sparkle and Angmaat, the two rocks thought to be analogous to the earliest continental crust on Earth, can be obtained by fractional crystallization of chassignite-like parental melts. Our results suggest a link between the processes that resulted in chassignites and the rocks analyzed in situ at Gale crater. To assess the possible scenarios for Martian magma migration and storage processes, we compared chassignites to terrestrial analogs formed via various mechanisms and proposed two mechanisms that may explain the intrusive and effusive rocks found in situ at Gale crater: (1) emplacement and fractionation in a closed-system crustal reservoir and (2) eruption of mafic to intermediate lavas of a relatively open system subject to constant replenishment.

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Section: Possible Earth Analogs For Chassignitesmentioning

confidence: 99%

Section: Possible Earth Analogs For Chassignitesmentioning

confidence: 99%

Melt inclusions in chassignite NWA 2737: A link between processes recorded in Martian meteorites and rocks at Gale crater

Gazel

Udry

et al. 2021

Meteorit & Planetary Scien

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“…This is indicated by the 55 Ma Skaergaard intrusion in Greenland whose spectacular chemical stratigraphy indicates that before the onset of crystallization it was a ‘big tank’ of crystal-free tholeiitic parent magma up to 4 km in thickness and up to 300 km 3 in volume 72 , 73 . Another example is the 1.3 Ga Kiglapait intrusion in Labrador with 3500 km 3 of magma in a > 8 km thick magma chamber that shows a continuous differentiation sequence with little or no magma recharge 74 , 75 . It is therefore conceivable that such magma chambers have developed throughout the entire Earth’s evolution.…”

Section: Introductionmentioning

confidence: 99%

A 5-km-thick reservoir with > 380,000 km3 of magma within the ancient Earth's crust

Latypov

Chistyakova

Hornsey

et al. 2022

Sci Rep

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Several recent studies have argued that large, long-lived and molten magma chambers may not occur in the shallow Earth’s crust. Here we present, however, field-based observations from the Bushveld Complex that provide evidence to the contrary. In the eastern part of the complex, the magmatic layering continuously drapes across a ~ 4-km-high sloping step in the chamber floor. Such deposition of magmatic layering implies that the resident melt column was thicker than the stepped relief of the chamber floor. Prolonged internal differentiation within this thick magma column is further supported by evolutionary trends in crystallization sequence and mineral compositions through the sequence. The resident melt column in the Bushveld chamber during this period is estimated at > 5-km in thickness and > 380,000 km3 in volume. This volume of magma is three orders of magnitude larger than any known super-eruption in the Earth’s history and is only comparable to the extrusive volumes of some of Earth’s large igneous provinces. This suggests that super-large, entirely molten, and long-lived magma chambers occur, at least occasionally, in the geological history of our planet. Therefore, the classical view of magma chambers as ‘big magma tanks’ remains a viable research concept for some of Earth’s magmatic provinces.

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Petrogenesis of the 1149 Ma Etoile Suite Mafic Intrusion, Quebec: implications for vanadium mineralisation in Proterozoic anorthosite-bearing terranes

Maier,

Dare,

Smith

2024

Miner Deposita

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Isotopic and Trace Element Geochemistry of the Kiglapait Intrusion, Labrador: Deciphering the Mantle Source, Crustal Contributions and Processes Preserved in Mafic Layered Intrusions

Cited by 16 publications

References 136 publications

Melt inclusions in chassignite NWA 2737: A link between processes recorded in Martian meteorites and rocks at Gale crater

Melt inclusions in chassignite NWA 2737: A link between processes recorded in Martian meteorites and rocks at Gale crater

A 5-km-thick reservoir with > 380,000 km3 of magma within the ancient Earth's crust

Petrogenesis of the 1149 Ma Etoile Suite Mafic Intrusion, Quebec: implications for vanadium mineralisation in Proterozoic anorthosite-bearing terranes

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