The Lapland charnockitic complex: REE geochemistry and petrogenesis

Barbey, Pierre; Bernard-Griffiths, J.; Convert, J.

doi:10.1016/0024-4937(86)90002-2

Cited by 10 publications

(8 citation statements)

References 20 publications

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“…Its petrology has been a subject of many studies during the last 50 years (Eskola, 1952;Meriläinen, 1976;Hörman et al, 1980;Raith & Raase, 1986;Barbey & Raith, 1990;Korja et al, 1996;Leibinger, 1996;Korja et al, 1996;Leibinger, 1996;Leibinger, 1996;Perchuck et al, 2000) and has been recently revised ) and has been recently revised by Tuisku et al (2006) who demonstrated a regional scale, clockwise PT evolution. Isotopic dating has confirmed that the LGB is Palaeoproterozoic in age (Meriläinen, 1976;Bernard-Griffiths et al, 1984;Huhma & Meriläinen, 1991;Bibikova et al, 1993;Sorjonen-Ward et al, 1994;Tuisku & Huhma, 1998Daly et al, 2001) and geochemical data suggest that the igneous rocks of the belt were formed in arc setting (Barbey et al, 1986;Bibikova et al, 1993). Tectonically the LGB is thought to represent a crustal scale, SW-directed thrust sequence (Marker, 1988;Korja et al, 1996).…”

Section: Introductionmentioning

confidence: 96%

“…No detailed trace element survey was included in our study, but it is useful to give a short review of earlier studies on the norite-enderbite series (i.e. Barbey et al, 1986;Bibikova et al, 1993). Part of their trace-element data on meta-igneous rocks of the LGB, normalized to the primitive mantle composition, is shown in Fig.…”

Section: Evolution and Crystallization Of The Noriteenderbite Series mentioning

confidence: 99%

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Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Tuisku¹,

Huhma²

2006

Bull Geol Soc Finland

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The migmatitic metapelites of the Lapland granulite belt (LGB) in the NE part of the Fennoscandian Shield represent an arc-related greywacke basin metamorphosed in the granulite facies. Detrital zircons from migmatitic metapelites are derived from 1.94 etrital zircons from migmatitic metapelites are derived from 1.94 zircons from migmatitic metapelites are derived from 1.94 derived from 1.94 − 2.9 Ga old acid source rocks (U-Pb SIMS ages). The clustering of detrital zircon ages between 1.97 and 2.2 Ga is problematic, because abundant felsic crust of this age is absent in the shield. The metasediments are characterized by Sm-Nd model ages of ca. 2.3 Ga. A younger, 1905 − 1880 Ma population of homogeneous zircons was formed during regional metamorphism. The peak high-grade metamorphism took place at ~1900 Ma and the latest chronological record from subsequent decompression and cooling phase is from ca. 1870 Ma. The norite-enderbite series of the LGB represents arc-magmas, which were intruded into the metasediments at ~1920 − 1905 Ma ago according to zircon U-Pb ages and were probably an important heat source for metamorphism. Older, zoned zircon grains in a quartz norite vein, initial ε Nd values of 0 to +1 and the continuous spectrum of LILE enrichment in the enderbite-series probably reflect assimilation of metasediments by magmas. Monazite U-Pb ages of migmatitic metasediments in the range 1906 − 1910 ± 3 Ma overlap the late stage of enderbite intrusion and growth of early metamorphic zircons. Garnetwhole rock Sm-Nd ages from leucosomes in the range 1880 − 1886 ± 7 Ma are concurrent with the growth of the youngest metamorphic zircons and probably indicate the crystallization of leucosomes or the influence of a fluid liberated from them. Isotopic and petrologic data reveal that the evolution of Lapland Granulite belt from the erosion of source rocks to the generation of a sedimentary basin, its burial, metamorphism and exhumation took place within ca. 60 Ma.

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Section: Introductionmentioning

confidence: 96%

Section: Evolution and Crystallization Of The Noriteenderbite Series mentioning

confidence: 99%

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Tuisku¹,

Huhma²

2006

Bull Geol Soc Finland

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“…Metasedimentary granulites, ranging in composition from psammitic to pelitic, form the main rock type and are also called khondalites or khondalite series (e.g. Barbey et al, 1986;Korja et al, 1996). The series is composed mostly of acid migmatitic gneisses or kinzigites, which often have a strong S-tectonitic or blastomylonitic structure usually dipping gently to NE, except at the northeastern margin, where the dips are steeply south-westwards.…”

Section: Geological Settingmentioning

confidence: 99%

“…These have also been called the Lapland charnockitic complex (Barbey et al, 1986). Because norites, orthopyroxene quartz diorites and enderbites form the majority of the plutonic rock series in the LGB, we prefer the term noriteenderbite series.…”

Section: Geological Settingmentioning

confidence: 99%

“…Recent bedrock mapping and use of geophysical data (Korja et al, 1996; this study) have shown that, in addition to migmatitic metapelites, intermediate to basic rocks form an important constituent of the belt. These were earlier called the Lapland charnockitic complex (Barbey et al, 1986), but later loosely called enderbites or norite-enderbite series according to major igneous rock types (Korja et al, 1996;Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part I: Metamorphic geology

Tuisku¹,

Mikkola²,

Huhma³

2006

Bull Geol Soc Finland

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The Palaeoproterozoic Lapland granulite belt was juxtaposed between Archaean and Proterozoic terrains in the NE part of the Fennoscandian Shield concurrently with the accretion of Svecofennian arc complexes at ~1.9 Ga. The belt consists mainly of aluminous migmatitic metagreywackes. Abundant noritic to enderbitic magmas were intruded concordantly into the metasediments and were probably an important heat source for metamorphism, which took place during the crystallization of the magmas. This is supported by structural and contact relations of metasediments and igneous rocks, and by the lack progressive metamorphic reaction textures in the igneous rock series. The peak of metamorphism took place above the dehydration melting temperature of the biotite-sillimanite-plagioclase-quartz assemblage at 750−850°C and 5−8.5 kbar which lead to formation of a restitic palaeosome and peraluminous granitic melt in metapelites. Subsequently, the rocks were decompressed and cooled below the wet melting temperature of pelitic rocks (650°C) under the stability fi eld of andalusite coexisting with potassium feldspar (2−3 kbar). Cooling was accompanied by the crystallization of the neosomes, often carrying aluminium-rich phases. Postmetamorphic duplexing of the LGB is clearly seen in the distribution of calculated PT conditions.

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The Granulite Belt of Lapland

Barbey¹,

Raith

1990

Granulites and Crustal Evolution

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The Lapland charnockitic complex: REE geochemistry and petrogenesis

Cited by 10 publications

References 20 publications

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part I: Metamorphic geology

The Granulite Belt of Lapland

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