The geochemistry, genesis, and geotectonic setting of Proterozoic mafic dyke swarms in southern and central Sweden

Solyom, Zoltan; Lindqvist, Oliver; Johansson, Ingrid

doi:10.1080/11035899209453461

Cited by 33 publications

(15 citation statements)

References 35 publications

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“…The analytical methods include XRF, AAS and photospectrometery. Solyom et al (1992) describe the procedures in more detail. Table 2 shows the results.…”

Section: Whole-rock Chemistrymentioning

confidence: 99%

Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Lindh¹,

Krauss

Franz

2001

GFF

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“…The analytical methods include XRF, AAS and photospectrometery. Solyom et al (1992) describe the procedures in more detail. Table 2 shows the results.…”

Section: Whole-rock Chemistrymentioning

confidence: 99%

Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Lindh¹,

Krauss

Franz

2001

GFF

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“…East of the Protogine Zone is the ∼700 km long N‐ to NNW trending Blekinge‐Dalarna Dolerites swarm (fig. 1; Solyom et al 1992). Some dykes of the Protogine Zone may also belong to this swarm (Johansson & Johansson 1990; Solyom et al 1992).…”

Section: Geology and Samplingmentioning

confidence: 99%

Palaeomagnetism of 935 Ma mafic dykes in southern Sweden and implications for the Sveconorwegian Loop

Pisarevsky¹,

Bylund

2006

Geophysical Journal International

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S U M M A R YNew palaeomagnetic results for the 935 Ma Göteborg-Slussen mafic dykes in southern Sweden provide a well-dated high-quality palaeomagnetic pole for Early Neoproterozoic Baltica. New U-Pb geochronological data for several palaeomagnetically studied mafic intrusions yield three additional well-dated palaeopoles and one virtual geomagnetic pole. This set of dated poles suggests minimal drift of Baltica in moderate latitudes between ∼965 and 915 Ma. They also support the hypothesis of a post-900 Ma regional remagnetization event in SW Sweden and SW Norway. The positions of three distinct clusters of ∼1100 to 850 Ma palaeopoles suggest a clockwise time progression of the Baltica apparent polar wander path (the Sveconorwegian Loop) during this time interval. New well-dated palaeomagnetic poles for ∼970 to 900 Ma from Laurentia are required to verify the palaeogeographic reconstructions of Baltica and Laurentia.

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“…Locally, the schist develops into rusty quartz-sericite schist or sericite quartzite rich in sulphides. Methods, precision and accuracy: see Solyom, Lindqvist & Johansson (1992; their table 1) 500 Ma eclogites from Baltica 733 For comparison, columns to the right show averages of dolerites from the Pieljekaise Nappe ( Fig.…”

Section: A Juron Quartzite and Metavolcanitementioning

confidence: 99%

Derivation of 500 Ma eclogites from the passive margin of Baltica and a note on the tectonometamorphic heterogeneity of eclogite-bearing crust

Andréasson

Albrecht

1995

Geol. Mag.

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Several recent plate reconstructions of the Iapetus Ocean describe the margins of Baltica as passive until Silurian collision with Laurentia. Yet there is a variety of evidence to suggest that the accretion of the Scandinavian Caledonides began by latest Cambrian-early Ordovician subduction and imbrication of the passive continental margin. One such evidence is provided by eclogites occurring in the Seve Nappe Complex. Previous work by others dated the high-pressure metamorphism at 503±14Ma (Sm-Nd garnet-omphacite age), and the uplift through the c. 500°C isotherm at 491 ±8 Ma C°Ar/ 39 Ar hornblende plateau ages). The protolith dolerites of the eclogites have been correlated with Iapetan rift-facies dolerites of the Baltoscandian margin. If valid, such a correlation implies early Caledonian destruction of the margin, and thus modification of those plate reconstructions which require passive margins around Baltica in latest Cambrian-early Ordovician time. This paper provides a substantially improved basis for the concept that the protoliths of eclogites and their host rocks derived from Baltoscandian rift basins. The chemical similarity between coronitic dolerites and dolerites of the rift basins pertains not only to element concentrations and variations but also to the specific T-MORB signature shared by the two groups. The variation of psammitic and pelitic schists, graphitic schists, calc-silicate gneisses and marbles of the eclogite host rocks equates with sequences of sandstones, siltstones, shales, black shale, quartzite, dolomite and limestones of Baltoscandian palaeobasins.At the same time, the paper calls attention to the remarkable preservation of structural and metamorphic contrasts within the eclogite-bearing thrust sheets of the Seve Nappe Complex. Such disequilibrium is generally ascribed to the kinetics of localized deformation and fluid infiltration into dry crust. This paper presents evidence that disequilibrium is found also within inferred subducted sedimentary complexes, which are generally assumed to be pervasively flushed by fluids. Preservation of sedimentary, volcanic and magmatic structures and fabrics, and of both undeformed dolerite dykes and eclogitized dykes demonstrates that neither deformation nor high-pressure metamorphism were pervasive.

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The geochemistry, genesis, and geotectonic setting of Proterozoic mafic dyke swarms in southern and central Sweden

Cited by 33 publications

References 35 publications

Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Palaeomagnetism of 935 Ma mafic dykes in southern Sweden and implications for the Sveconorwegian Loop

Derivation of 500 Ma eclogites from the passive margin of Baltica and a note on the tectonometamorphic heterogeneity of eclogite-bearing crust

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