The Archaean sanukitoid series of the Baltic Shield: geological setting, geochemical characteristics and implications for their origin

Лобач-Жученко, С. Б.; Rollinson, Hugh; Chekulaev, V. P.; Arestova, N. A.; Kovalenko, A. V.; Ivanikov, V. V.; Guseva, N. S.; Сергеев, С. А.; Matukov, D. I.; Jarvis, Kym E.

doi:10.1016/j.lithos.2004.04.052

Cited by 85 publications

(17 citation statements)

References 22 publications

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“…These intrusions are also similar to those iden- tified in the Baltic Shield, where a range of dehydrated to hydrated plutons intrude older gneisses and are host to ultramafic xenoliths (e.g. Lobach-Zhuchenko et al 2005). …”

Section: Regional Correlationssupporting

confidence: 59%

“…Sanukitoid magmatism is interpreted to be generated by rifting and mantle upwelling related to slab break-off (e.g. Stevenson et al 1999;Lobach-Zhuchenko et al 2008;Heilimo et al 2010). In the RBb, this observation is consistent with a period of magma generation at 2.73-2.71 Ga, followed by voluminous sanukitoid magmatism with negative Ta and Nb anomalies and a coincident depletion in Ti, Y, Yb concentrations in the RBb.…”

Section: Implications For Neoarchean Magmatismmentioning

confidence: 53%

“…(Fig. 10; Moyen et al 2001;Lobach-Zhuchenko et al 2005;de Oliveira et al 2011;Heilimo et al 2013). These sanukitoid intrusions are isotopically similar to comparable rocks in the Superior and Slave cratons of the Canadian Shield (Heilimo et al 2013, and references therein), demonstrating that the same crustal formation processes were occurring within the Rae craton as well.…”

mentioning

confidence: 54%

“…In many cases, the intrusion of regional-scale sanukitoid and high-K plutons occurred within tens of millions of years of the intrusion of TTG gneiss, and developed from a mixture of mantle and recycled crustal components (e.g. Lobach-Zhuchenko et al 2008;Heilimo et al 2013). This process is similar to A-type magmatism following subduction in post-Archean convergent plate margins (e.g.…”

Section: Implications For Neoarchean Magmatismmentioning

confidence: 99%

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Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

LaFlamme

McFarlane

Corrigan

2015

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SUMMARYThe Repulse Bay block (RBb) of the southern Melville Peninsula, Nunavut, lies within the Rae craton and exposes a large (50,000 km 2 ) area of middle to lower crust. The block is composed of ca. 2.86 Ga and 2.73-2.71 Ga tonalite-trondhjemitegranodiorite (TTG) and granitic gneiss that was derived from an older 3.25 and 3.10 Ga crustal substrate. This period of crustal generation was followed by the emplacement of ca. 2.69-2.66 Ga enderbite, charnockite, and granitoid intrusions with entrained websterite xenoliths. These voluminous batholith-scale bodies (dehydrated and hydrated intrusions), and the associated websterite xenoliths, have similar whole rock geochemical properties, including fractionated light rare earth element (LREE)-heavy (H)REE whole rock patterns and negative Nb, Ti, and Ta anomalies. Dehydrated intrusions and websterite xenoliths also contain similar mineralogy (two pyroxene, biotite, interstitial amphibole) and similar pyroxene trace element compositions. Based on geochemical and mineralogical properties, the two lithologies are interpreted to be related by fractional crystallization, and to be the product of a magmatic cumulate processes. Reworking of the crust in a ca. 2.72 Ga subduction zone setting was followed by ca. 2.69 Ga upwelling of the asthenospheric mantle and the intrusion of massif-type granitoid plutons. Based on a dramatic increase in FeO, Zr, Hf, and LREE content of the most evolved granitoid components from the 2.69-2.66 Ga cumulate intrusion, we propose that those granitoid plutons were in part derived from a metasomatized mantle source enriched by fluids from the subducting oceanic slab that underwent further hybridization (via assimilation) with the crust. Large-scale, mantle-derived Neoarchean sanukitoid-type magmatism played a role in the development of a depleted lower crust and residual sub-continental lithospheric mantle, a crucial element in the preservation of the RBb. RÉSUMÉ

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Section: Regional Correlationssupporting

confidence: 59%

Section: Implications For Neoarchean Magmatismmentioning

confidence: 53%

mentioning

confidence: 54%

Section: Implications For Neoarchean Magmatismmentioning

confidence: 99%

See 2 more Smart Citations

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

LaFlamme

McFarlane

Corrigan

2015

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“…Although these potassic granitic rocks are only a minor component of Archean granite-greenstone terranes, they nonetheless comprise a significant part of the Archean crust (Sutcliffe et al, 1990) and have a disproportionate tectonic importance. Studies have demonstrated that most of the late potassic granitoids, especially the sanukitoids and the Closepet-type granites (e.g., Frost et al, 1998;Jayananda et al, 2000;Smithies and Champion, 2000;Moyen et al, 2001Moyen et al, , 2003Halla, 2005;Lobach-Zhuchenko et al, 2005;de Oliveira et al, 2009;Martin et al, 2009;Moyen, 2011), originated directly from an enriched lithospheric mantle rather than by reworking (partial melting) of earlier TTG. Hence, these potassic high Ba-Sr granitoids carry important clues as to their source, petrogenesis and mechanisms of continental crustal formation and crustal evolution in the Archean (e.g., Taylor and McLennan, 1985;Rudnick, 1995).…”

mentioning

confidence: 99%