Contrasting source components of the Paleoproterozoic Svecofennian metasediments: Detrital zircon U–Pb, Sm–Nd and geochemical data

Lahtinen, Raimo; Huhma, Hannu; Kousa, Jukka

doi:10.1016/s0301-9268(02)00018-9

Cited by 95 publications

(51 citation statements)

References 52 publications

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“…1.94 Ga. The LGB palaeobasin was obviously buried as a tectonic mélange between convergent plates before the c. 1.92 − 1.91 Ga intrusion of enderbites (Tables 4 and 5 in this work; Meriläinen, 1976;Bibikova et al, 1993) The Sm-Nd and detrital zircon U-Pb isotopic characteristics of the LGB metasediments are quite similar with the major Svecofennian and upper Kalevian metasediments in southern Finland and Sweden (Huhma, 1987;Claesson et al, 1993;Lahtinen et al, 2002). Thus, a correlation of the LGB protolith with that of Svecofennian metagreywackes cannot be excluded.…”

Section: Provenance and Age Of Deposition Of The Lgb Metasedimentssupporting

confidence: 60%

“…2.0 age group are found in the northern part of the shield, for example in the Korkiavaara arkosite formation in the Peräpohja Schist Belt (Hanski et al, 2005) and in the Tersk Terrane orthogneiss (Daly et al, 2001). The 2.0 Ga age group is common among the detrital grains in meta-greywackes of the Svecofennian formations Claesson et al, 1993;Lahtinen et al, 2002;Rutland et al, 2004). In summary, the major provenance of the LGB is from an unknown 2.0 − 2.1 Ga siliceous igneous terrain suggesting that the LGB is an allochthonous province.…”

Section: Provenance and Age Of Deposition Of The Lgb Metasedimentsmentioning

confidence: 88%

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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: Provenance and Age Of Deposition Of The Lgb Metasedimentssupporting

confidence: 60%

Section: Provenance and Age Of Deposition Of The Lgb Metasedimentsmentioning

confidence: 88%

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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“…As no older inherited zircon ages typical of Svecofennian detrital material (cf. Claesson et al, 1993;Lahtinen et al, 2002) were encountered, and yet the composition of the granite is characteristic of a low-temperature melt, indicating that no significant new zircon crystallization took place, it is possible that the adjacent synorogenic granitoid rocks constitute the principal source for the Oripää granite, instead of Fig. 9.…”

Section: The Oripää Granitementioning

confidence: 99%

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

Kurhila¹,

Vaasjoki²,

Mänttäri³

et al. 2005

Bull Geol Soc Finland

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U-Pb ages and whole-rock Nd isotope data have been obtained from the Paleoproterozoic lateorogenic migmatizing microcline granites of southwestern Finland. Isotope dilution and ion microprobe U-Pb data on zircons and monazites show that the age spectrum of these granites is at least 1.85-1.82 Ga. Commonly, zircons and monazites record the same ages. The age variation in the Veikkola granite area is of the order of 25 Ma and indicates that this seemingly homogeneous granite consists of two separate intrusions. The zircons of the lateorogenic granites are pervasively altered and conventional U-Pb results are commonly discordant. The ion microprobe studies reveal that the granites contain very few inherited zircons with preserved original U-Pb isotope ratios, with the exception of the Oripää granite. Initial ε Nd values, mostly in the range of -0.5 to -1.0, imply a moderate input of older crustal material into most of the lateorogenic granites. A shift from more juvenile to less radiogenic Nd isotope composition is observed from north to south, and the variation pattern of ε Nd values of the lateorogenic granites is thus similar to that of the surrounding synorogenic granitoid rocks.

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“…McLennan et al 1993;McLennan et al 1995;Yamashita et al 2000;Goodge et al 2002;Lahtinen et al 2002;Tran et al 2003;González-Álvarez et al 2006;Payne et al 2006;Barovich and Hand 2008;Tran et al 2008). U-Pb geochronology of zircon-bearing sources provides an age spectrum and maximum depositional age of the sediment.…”

Section: Regional Chemostratigraphymentioning

confidence: 99%

“…Small standard deviations for La/Yb PAAS indicate a very homogeneous source. Th/Sc and Cr/Th ratios of ~2.3 and ~3.1 respectively suggest that the Stubbins Formation is derived from a felsic source (Taylor and McLennan 1985;Condie and Wronkiewicz 1990;McLennan et al 1990;Lahtinen 2000;Lahtinen et al 2002). The source must have been strongly evolved, as reflected by the average ε Nd (1860 Ma) value of ~ -5.…”

Section: Stubbins Formation; Eventmentioning

confidence: 99%

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

2010

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The development of a regional stratigraphy in Palaeoproterozoic basins within the Tanami region, Northern Australia has been hindered by the difficulty of discriminating sedimentary units and facies across this isolated and poorly exposed basin. A regional stratigraphy is important as it provides constraints on sedimentary basin evolution and assists in gold exploration. Gold is known to be more concentrated in certain rock formations. Based on Nd isotopes and whole-rock geochemistry, five main sedimentary events have been identified in the Tanami region. Some sedimentary units were derived from homogeneous local sources whereas others contain evidence of a well-mixed fine-grained remote provenance. Within the basins, major gold-bearing lithologies are characterised by mafic source indicators: (1) high Cr/Th ratios; (2) low Th/Sc ratios; (3) low (La/Yb) PAAS ratios relative to Post-Archaean Average Shale (Taylor and McLennan 1985); (4) Eu anomalies equal to ~1 and, (5) distinctive ranges in initial  Nd values. Potential future exploration target areas have been identified in the Tanami region at the Cashel and Sunline prospects using these geochemical parameters.

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Contrasting source components of the Paleoproterozoic Svecofennian metasediments: Detrital zircon U–Pb, Sm–Nd and geochemical data

Cited by 95 publications

References 52 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

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

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