Petrological and geochemical characteristics of Mesoproterozoic dyke swarms in the Gardar Province, South Greenland: Evidence for a major sub-continental lithospheric mantle component in the generation of the magmas

Bartels, Alexander; Nielsen, Thorkild; Lee, Seung Ryeol G. J.; Upton, B. G. J.

doi:10.1180/minmag.2015.079.4.04

Cited by 30 publications

(19 citation statements)

References 75 publications

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“…1300 and 1150 Ma possibly related to the Grenvillian Orogeny further to the south (Bartels et al, 2015). Initial clastic sedimentation and volcanism is followed by intense magmatism, forming exotic alkaline rocks (Upton, 2013;Bartels et al, 2015). The Ivigtut Cryolite Mine that was economically very important for Greenland in the 19 th and 20 th century is hosted by one of the intrusions.…”

Section: Accepted Manuscriptmentioning

confidence: 96%

“…An exception is the South Greenlandic Gardar Intrusive Suite and Eriksfjord Formation, which formed in a two-stage rift evolution at ca. 1300 and 1150 Ma possibly related to the Grenvillian Orogeny further to the south (Bartels et al, 2015). Initial clastic sedimentation and volcanism is followed by intense magmatism, forming exotic alkaline rocks (Upton, 2013;Bartels et al, 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 97%

“…The origin of the magmatic layering in the kakortokite is still enigmatic but is generally thought to be a product of fractionate crystallization during upward crystallization of a compositionally stratified magma with possible magma degassing and replenishment influencing the stratification (Larsen and Sørensen, 1987;Pfaff et al, 2008;Upton, 2013). The magma is proposed to represent partial melt of mantle peridotite within the garnet stability field, where the peridotite experienced metasomatism during Paleoproterozoic subduction and formation of the Ketilidian Orogen or in a back-arc setting during the Grenvillian Orogeny to the south (Goodenough et al, 2000;Marks et al, 2004b;Upton, 2013;Bartels et al, 2015).…”

Section: Gardar Intrusive Suitementioning

confidence: 99%

“…22; Upton et al, 2003). The dikes are tholeiitic to alkaline and formed from relatively evolved, mantle-derived melts with only minor degrees of crustal contamination (Bartels et al, 2015). The source of the melt probably lies in metasomatized sub-continental lithospheric mantle (SCLM)…”

Section: Gardar Intrusive Suitementioning

confidence: 99%

“…22;Upton, 2013;Bartels et al, 2015).6.1.1 Independence Fjord Group and Zig-Zag Dal Basalt FormationThe ~2 km thick Independence Fjord Group summarizes similar sedimentary and locally volcanic rocks in North-East Greenland that in the foreland of the Caledonian Orogen unconformably overly Paleoproterozoic basement and further east are incorporated into Caledonian nappes (Fig. 21;Collinson et al, 2008;Higgins, 2015).…”

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confidence: 96%

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Metallogeny of Greenland

Kolb

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et al. 2016

Ore Geology Reviews

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Section: Accepted Manuscriptmentioning

confidence: 96%

Section: Accepted Manuscriptmentioning

confidence: 97%

Section: Gardar Intrusive Suitementioning

confidence: 99%

Section: Gardar Intrusive Suitementioning

confidence: 99%

mentioning

confidence: 96%

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Metallogeny of Greenland

Kolb

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et al. 2016

Ore Geology Reviews

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Petrology and geochemistry of the Batchingou anorthositic suite rocks (Bana volcano‐plutonic complex, Cameroon Volcanic Line): Inference on their origin and relation with host granites

et al. 2022

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This study focusses on field mapping, petrographic description, and geochemical analyses of the Batchingou anorthositic suite rocks (Bana Plutono-volcanic Anorogenic Complex, Cameroon Volcanic Line). This suite consists of gabbroic (gabbro, gabbronorite, norite, and anorthosite) and charnockitic (mangerite, jotunite, enderbite, and monzogranite) rocks and intrude Ypresian granites (51 ± 1 Ma), within an elliptically shaped corridor of 1200 Â 600 m 2 . Gabbroic rocks evolved by crystal fractionation of olivine, hypersthene, augite, plagioclase, and ilmenite following the path: gabbro ! gabbronorite ! norite ! anorthosite. There is little or no crustal assimilation in this suite, contrarily to the charnockitic suite which likely evolved from a jotunite melt by assimilation of the Pan-African granito-gneissic basement rocks. Anorthosite has high Eu/Eu* (2.04-2.66), typical of anorthosites formed as cumulates. The La/Ta ratios (9.75-20.1 in gabbro, 21-45 in anorthosite and 23-76 charnockitic rocks), La/Yb N (4.2-19.5), Nb/U (22-90), and Nb/Th (5-23) suggest that the parental magma of the Batchingou anorthositic suite rocks is an alkaline basaltic melt deriving from a garnet-bearing asthenospheric mantle, but was variably modified during ascent by lithospheric spinel lherzolites and crustal rocks. The Batchingou gabbro has characteristics of evolved tholeiites and match the composition of the Laramie high-Al gabbro, whereas jotunite shows compositional affinity to ferrodiorites from Proterozoic anorthosite complexes. The gabbro Ni (19-39 ppm) and Cu (44-118 ppm) contents are low, indicating that their parental melt is not primitive. The Batchingou anorthositic suite differentiated from a different magma batch postdating the host granitoids and is similar to the anorthosite dykes of the Mboutou ring complex (Cameroon) and most of the ring complexes of the Aïr Province (Niger).

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A Nd- and O-isotope study of the REE-rich peralkaline Strange Lake granite: implications for Mesoproterozoic A-type magmatism in the Core Zone (NE-Canada)

Siegel

Williams‐Jones

Stevenson

2017

Contrib Mineral Petrol

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Abstract:It is well established that A-type granites enriched in high field strength elements, such as Zr, Nb and the REE, form in anorogenic tectonic settings. The sources of these elements and the processes controlling their unusual enrichment, however, are still debated. They are addressed here using neodymium and oxygen isotope analyses of samples from the 1.24 Ga Strange Lake pluton in the Paleoproterozoic Core Zone of Québec-Labrador, an A-type granitic body characterised by hyper-enrichment in the REE, Zr, and Nb. Age-corrected εNd values for bulk rock samples and sodic amphiboles (mainly arfvedsonite) from the pluton range from -0.6 to -5.7, and -0.3 to -5.3, respectively. The εNd values for the Napeu Kainiut quartz monzonite, which hosts the pluton, range from -4.8 to -8.1. The 147Sm/144Nd ratios of the suite and the host quartz monzonite range from 0.0967 to 0.1659, large variations that can be explained by in-situ fractionation of early LREE-minerals (Strange Lake), and late hydrothermal HREE remobilization. Oxygen isotope analyses of quartz of both Strange Lake and the host yielded δ18O values between +8.2 and +9.1, which are considerably higher than the mantle value of 5.7 ± 0.2 ‰. Bulk rock oxygen isotope analyses of biotite-gneisses in the vicinity of the Strange Lake pluton yielded δ18O values of 6.3, 8.6 and 9.6 ‰. The negative εNd values and positive δ18O values of the Strange Lake and Napeu Kainiut samples indicate that both magmas experienced considerable crustal contamination. The extent of this contamination was estimated, assuming that the contaminants were sedimentary-derived rocks from the underlying Archean Mistinibi (para-) gneiss complex, which is characterized by low εNd and high δ18O values. Mixing of 5 -15 % of a gneiss, having an εNd value of -15 and a δ18O value of +11, with a moderately enriched mantle source (εNd = +0.9, δ18O = +6.3) would produce values similar to those obtained for the Strange Lake granites. Based on analogies between the Nain Plutonic Suite and the Gardar alkaline igneous province (SWGreenland), we conclude that the Strange Lake pluton and associated REE- Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporationmineralized anorogenic bodies formed from a combination of subduction-induced fertilization of the sublithospheric mantle, crustal extension and in-situ magma evolution.Response to Reviewers: RESPONSE TO REVIEWERS We are encouraged that Editor Timothy L. Grove and Reviewer #1 consider our manuscript, which presents a hypothesis for the generation of the Strange Lake pluton and other HFSE mineralized silicate bodies of the Nain Plutonic Suite, to have merit and be worthy of publication after appropriate revision. Reviewer #2 questions our model that mantle-derived fertile melts were important and requests additional proof. Below, we systematically address the minor points raised by Reviewer #1 and then the more substantial criticisms of the manuscript by Reviewer #2. REVIEWER # 1General comments/questions of Reviewer # 1: Revi...

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Petrological and geochemical characteristics of Mesoproterozoic dyke swarms in the Gardar Province, South Greenland: Evidence for a major sub-continental lithospheric mantle component in the generation of the magmas

Cited by 30 publications

References 75 publications

Metallogeny of Greenland

Metallogeny of Greenland

Petrology and geochemistry of the Batchingou anorthositic suite rocks (Bana volcano‐plutonic complex, Cameroon Volcanic Line): Inference on their origin and relation with host granites

A Nd- and O-isotope study of the REE-rich peralkaline Strange Lake granite: implications for Mesoproterozoic A-type magmatism in the Core Zone (NE-Canada)

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