Intrusion mechanisms and magnetic fabrics of the Vehmaa rapakivi granite batholith in SW Finland

Karell, Fredrik; Ehlers, Carl; Airo, Meri-Liisa; Selonen, Olavi

doi:10.1127/1864-5658/09/96-0053

Cited by 7 publications

(17 citation statements)

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“…At that time we had few geophysical data available. Additional geological and geophysical data were reported by Selonen et al (2005) and Karell et al (2009). This recent material combined with a revision of the old material enables us now to give a more complete picture of the geological history of the different intrusion phases and their impact on the localization of natural stone quarries in the area.…”

Section: Introductionmentioning

confidence: 80%

“…In order to get a better picture of the intrusion relations an AMS (Anisotropy of Magnetic Susceptibility) study was initiated, focusing on the medium-grained porphyritic granites. Oriented drill core samples were collected for AMS analysis and a few samples for geochemical analysis were taken in the same area (see details in Karell et al 2009).…”

Section: Methodsmentioning

confidence: 99%

“…The two varieties of the mediumgrained porphyritic granite are distinct in the aeromagnetic map (Selonen et al, 2005;Karell et al, 2009;Fig. 3).…”

Section: Geophysical and Geochemical Features Within The Mediumgrainementioning

confidence: 99%

“…The difference shown by a low magnetic susceptibility in the outer granite (OG) and a high magnetic susceptibility in the inner granite (IG) is caused by varying magnetite content in the two grani-tes. Thermomagnetic measurements reveal that the main magnetic mineral responsible for the high magnetic susceptibility in the inner granite (IG) is magnetite while the magnetic susceptibility in the outer granite (OG) is derived from paramagnetic minerals (Karell et al, 2009). An AMS (Anisotropy of Magnetic Susceptibility) study indicates that the magnetic fabric is welldeveloped in the inner granite (IG) (Karell et al, 2009), and the strike of the magnetic foliation follows the concentric structure of the intrusive contacts dipping gently outwards, away from the centre (Fig.…”

Section: Geophysical and Geochemical Features Within The Mediumgrainementioning

confidence: 99%

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Magmatic constraints on localization of natural stone deposits in the Vehmaa rapakivi granite batholith, southwestern Finland

Selonen¹,

Ehlers²,

Luodes³

et al. 2011

Bull Geol Soc Finland

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The 1580-1570 Ma old Vehmaa rapakivi granite batholith was studied with the aim to define the geological constraints for localization of natural stone deposits in the batholith. The batholith comprises four roughly concentric granite intrusions from the margin inwards: pyterlite, coarse-grained porphyritic rapakivi granite and two types of mediumgrained porphyritic rapakivi granite. Also porphyry aplite and even-grained rapakivi granite occur. The batholith has intruded as a succession of pulses of subhorizontal sheet-like intrusions conceivably through repeated cauldron subsidence. Natural stone quarries are confined only to certain intrusions within the batholith. We show that the mediumgrained porphyritc granite body in the centre of the batholith comprises two almost identical but different intrusions, with only slightly different appearances: the inner (IG) and the outer (OG) granite. The quarries are confined to the outer intrusion which has an appearance more attractive to the market than that of the inner intrusion. The localization of the natural stone deposits in the Vehmaa batholith is a result of the magmatic history of the batholith, producing intrusions of different appearances with different commercial potential.

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Section: Introductionmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

“…The two varieties of the mediumgrained porphyritic granite are distinct in the aeromagnetic map (Selonen et al, 2005;Karell et al, 2009;Fig. 3).…”

Section: Geophysical and Geochemical Features Within The Mediumgrainementioning

confidence: 99%

Section: Geophysical and Geochemical Features Within The Mediumgrainementioning

confidence: 99%

See 2 more Smart Citations

Magmatic constraints on localization of natural stone deposits in the Vehmaa rapakivi granite batholith, southwestern Finland

Selonen¹,

Ehlers²,

Luodes³

et al. 2011

Bull Geol Soc Finland

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“…We have studied selected Proterozoic rock areas of different geological settings in southern and central Finland (e.g. Selonen, 1998Selonen, , 2008Selonen et al, 2000Selonen et al, , 2005Selonen et al, , 2011Selonen et al, , 2012Karell, 2006;Nyman, 2007;Meriluoto, 2008;Arponen et al, 2009;Karell et al, 2009). The studies have been focused on granitic and metamorphic rocks (granites in a commercial sense) with the aim of defining geological constraints for the localization of natural stone deposits, and of identifying geological environments with potential for the occurrence of rocks suitable for production.…”

Section: Introductionmentioning

confidence: 99%

Exploration methods for granitic natural stones - Geological and topographical aspects from case studies in Finland

Selonen¹,

Ehlers²,

Luodes³

et al. 2014

Bull Geol Soc Finland

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Regional and local geological constraints for location of natural stone deposits in glaciated terrains of southern and central Finland have been studied and applied to practical exploration for natural stone. A list of geological and topographical aspects to be considered in exploration, is presented. Important aspects refer to: 1. Regional geology of the target area. 2. Magmatism (type and structure of intrusion, relative time of pluton emplacement). 3. Metamorphism (grade, mineral composition, parent material). 4. Deformation (lineaments, shear zones, folding, fault zones, fracture zones, shape preferred mineral orientations), and 5. Topography (relative elevation, micro topography). The proposed aspects can be used as geological guidelines in exploration for granitic natural stones.

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Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano–plutonic complex, Western Carpathians

2014

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Intrusion mechanisms and magnetic fabrics of the Vehmaa rapakivi granite batholith in SW Finland

Cited by 7 publications

References 0 publications

Magmatic constraints on localization of natural stone deposits in the Vehmaa rapakivi granite batholith, southwestern Finland

Magmatic constraints on localization of natural stone deposits in the Vehmaa rapakivi granite batholith, southwestern Finland

Exploration methods for granitic natural stones - Geological and topographical aspects from case studies in Finland

Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano–plutonic complex, Western Carpathians

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