Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronology, petrogenesis and geological setting

Upton, B. G. J.; Emeleus, C. H.; Heaman, Larry M.; Goodenough, Kathryn; Finch, Adrian A.

doi:10.1016/s0024-4937(03)00030-6

Cited by 172 publications

(121 citation statements)

References 78 publications

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“…the Baltic Shield (Pedersen et al, 2009;Petersson et al 2013), in Mexico (Weber et al, 2010) and in the Gardar Province of south Greenland (Blaxland et al, 1978;Upton et al, 2003). This event is roughly coeval with emplacement of the Harp (1271 ±1 Ma; Cadman et al, 1993), Mackenzie (1267 ±2 Ma; Le Cheminant & Heaman 1989) and Sudbury (1238 ±4 Ma; Krogh et al, 1987) dyke swarms.…”

Section: Hf Constrains On Subsurface Evolution Of Ohiomentioning

confidence: 95%

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Petersson

Scherstén

Andersson

et al. 2015

Precambrian Research

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Section: Hf Constrains On Subsurface Evolution Of Ohiomentioning

confidence: 95%

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Petersson

Scherstén

Andersson

et al. 2015

Precambrian Research

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“…Alkaline intrusions are derived from metasomatically enriched lithospheric mantle [28,29]. The high alkalies and fluorine contents of alkaline magmas increase the solubility of REEs, allowing the crystallization of REE-bearing sorosilicate minerals (allanite) [30].…”

Section: Geological Setting Of Reesmentioning

confidence: 99%

Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada

et al. 2018

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Abstract:The syenites in the western part of the Grenville Province in Quebec have been known since the 1990s, but few studies have been carried out on them. Over the last three years, a mapping project carried out by the Ministère de l'Énergie et des Ressources naturelles has revealed the presence of several rare earth element (REE)-bearing syenitic intrusions in this area. In this paper, we present a geodynamic model for their formation based on geochemical, thermobarometric, and geochronological data. The intrusions were emplaced between 1038 +15/−13 Ma and 1009 ± 3 Ma. The syenites can be divided into two groups: (1) an older, REE-bearing group associated with a volcanic arc and (2) a younger group with lower REE contents associated with an anorogenic event. Formation temperatures were between 898 and 1005 • C, and pressures were between 2 and 10 kbar. This model involving two intrusive periods is in conflict with the model of a large, hot, long-duration collisional orogen proposed by Rivers et al. (2009) but is consistent with more recent studies.

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“…The Ilímaussaq complex is part of the Gardar province in South Greenland, which represents an uplifted and eroded continental rift province of Mesoproterozoic age (see Upton et al 2003 andUpton 2013 for recent reviews). During the early stages of rifting, between 1350 and 1140 Ma, a thick (~ 3500 m) sequence of lavas and sediments called Eriksfjord Formation accumulated (Poulsen 1964;Larsen 1977a;Halama et al 2003).…”

Section: Geological Setting Of the Ilímaussaq Complexmentioning

confidence: 99%

“…Anorthositic xenoliths of up to 100 m size occur frequently in some of the mafic and intermediate intrusions (Bridgwater and Harry 1968). It is therefore assumed that a large anorthositic complex may be present at depth underlying the whole province (Bridgwater and Harry 1968;Upton et al 2003). A detailed study of plagioclase zonation in megacrysts allied to the anorthosites indicates crystallization at about 10-12 kbar prior to a rapid ascent to upper crustal levels (Halama et al 2002).…”

Section: Geological Setting Of the Ilímaussaq Complexmentioning

confidence: 99%

The Ilímaussaq Alkaline Complex, South Greenland

Marks

Markl

2015

Springer Geology

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The Ilímaussaq complex in South Greenland is a well-studied multiphase alkaline to peralkaline intrusion of Mesoproterozoic age. Most of the Ilímaussaq rocks are extremely enriched in alkalis, iron, halogens, high-field-strength elements (HFSE) and other rare elements, forming one of the most differentiated peralkaline rock suites known.The major factors causing the extreme differentiation trends are low oxygen fugacity and silica activity as well as very low water activity in the melts. These inhibit the early exsolution of aqueous NaCl-bearing fluids and facilitate the enrichment of alkalis and halogens in the melts, thereby increasing the solubility of HFSE. The unusually long crystallization interval of these rocks and the suspected continuous transition from melt to fluid results in extensive (auto)metasomatism and hydrothermal overprint. Primary mineral assemblages are therefore partially resorbed in most rock units and replaced by secondary minerals to various extents.The Ilímaussaq complex is a well-known example of magmatic layering in peralkaline plutonic rocks. Recent investigations of mineral chemical trends in the layered rocks permit better understanding of their formation. The mechanism of crystal mats formation in the cooling magma causing crowding effects during settling of the layering-forming minerals is believed to govern the formation of the Ilímaussaq layered sequence.Despite more than 100 years of research and hundreds of publications on Ilí-maussaq, important aspects on the origin of some Ilímaussaq rocks, the architecture and deep structure of the complex and the significance of hydrocarbons and bitumens present in the peralkaline rocks remain unclear. Thus, plenty of room for further studies on these unusual rocks exists and interdisciplinary research is needed to better understand the genesis of this unique magmatic complex.

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Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronology, petrogenesis and geological setting

Cited by 172 publications

References 78 publications

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada

The Ilímaussaq Alkaline Complex, South Greenland

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