The Vehmaa rapakivi granite batholith - An assemblage of successive intrusions indicating a piston-type collapsing centre

Selonen, Olavi; Ehlers, Carl; Luodes, Hannu; Lerssi, J.

doi:10.17741/bgsf/77.1.004

Cited by 8 publications

(16 citation statements)

References 8 publications

(6 reference statements)

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“…According to previous geological maps the batholith was composed of three concentric granite intrusions of pyterlite, coarse-grained porphyritic rapakivi granite, and, in the centre, medium-grained porphyritic rapakivi granite (Kanerva, 1928;Lindberg & Bergman, 1993). Later we found out that the (economically most productive) medium-grained porphyritic granite body in the middle of the batholith is composed of two separate intrusions (see below and Selonen et al, 2005) (Fig. 1).…”

Section: Introductionmentioning

confidence: 84%

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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: 84%

“…Geological map of the Vehmaa rapakivi granite batholith. Modified from Lindberg & Bergman (1993) and Selonen et al (2005). IG = inner intrusion of the medium-grained porphyritic granite, OG = outer intrusion of the medium-grained porphyritic granite.…”

Section: Introductionmentioning

confidence: 99%

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 main minerals are potassium feldspar, plagioclase, quartz, amphibole, and biotite (Härmä and Selonen 2008 ;Härmä et al 2015 ) (Table 1 ). The rock of the quarry B is a medium-grained red porphyritic rapakivi granite mainly composed of potassium feldspar, quartz, plagioclase, and biotite (Lindberg and Bergman 1993 ;Selonen et al 2005Selonen et al , 2011 ( Table 1 ). The porphyritic texture of the granite is defined by potassium feldspar phenocrysts (≤2 cm in length).…”

Section: Quarries and Production Devicesmentioning

confidence: 99%

Dust formed during drilling in natural stone quarries

Sairanen

Selonen

2017

Bull Eng Geol Environ

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Dust mass concentration and concentration decrease was studied in two natural stone quarries in Finland. The dust mass concentrations produced during drilling was measured at several distances with short time interval (5 s) sampling. The variation of concentration was high, and wind direction had a crucial effect on dust dispersion. The impact of weather conditions, such as temperature and relative humidity, on dust concentration were inconsistent. The dust produced during drilling was mainly coarse-grained and it settled quickly. The background mass concentration was attained from 55 to 105 m at the downwind direction from the drill. The fine particle mass concentrations were low during the measurements. The fine particles originated mainly from other, remote, sources and from the machinery used in the quarries. Local dust sources, such as hauling, had a significant impact on dust mass concentrations 1,* 2 1 2 even inside the quarry. The drilling capacity effected on dust mass concentration near the drill, but the impact vanished quickly with increasing distance.

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“…In composite batholiths and stocks all the magmatic phases could have potential for natural stone and must be considered in the exploration. A thorough and detailed geological and lithological field investigation may be needed for the identification of the different magmatic phases and their sometimes only slightly different appearances and colours (Selonen et al, 2005;Arponen et al, 2009;Selonen et al, 2011; cf. also e.g.…”

Section: Magmatic Aspects 221 Type Of Intrusionsmentioning

confidence: 99%

“…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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The Vehmaa rapakivi granite batholith - An assemblage of successive intrusions indicating a piston-type collapsing centre

Cited by 8 publications

References 8 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

Dust formed during drilling in natural stone quarries

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

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