Foto: Vacov - abandoned quarry
Vacov, opuštěný lom,
A small abandoned quarry situated about 400 m from the southeast. the edge of Vacov and reveals a migmatized biotite pararula, a characteristic rock of the Šumava Moldanubian. It is the most common rock in the region, but there are not many nice and especially easily accessible outcrops, moreover, you can drive almost to the locality. The quarry, situated in a small draw, has a size of about 20 x 20 m, the wall is stepped, a total of about 7 m high. The quarry used to be overgrown and used as an occasional waste deposit, but it was cleaned and arranged with the surroundings for leisure activities, for example, there are benches by well-trodden paths. The rock is a slightly weathered dark brown-gray, finely grained biotite pararula. It is markedly foiled, indistinctly banded, rather smudge-shaped, sometimes folded into decimeter folds. It consists of plagioclase, quartz and potassium feldspar with a content of 10-20% brown biotite. The felts of the feldspar stand out from the rock, sometimes merged into light, rather discontinuous strips, a sign of migmatization, ie weak melting. at an angle of 30 °. Two dominant subvertical fracture systems are evident in the quarry, characteristic of outcrops in the widest surroundings. The east-west fracture system (198/90) is repeated with a frequency of dm to meters, according to this system the veins of syenite porphyry were also intruded, which do not protrude in the vicinity of the quarry, but are widely documented on the whole map sheet. The second fracture system has an approximately perpendicular, north-south direction (80/90). The rock has a low magnetic susceptibility in the range of 0.20–0.43 x 10-3 SI, caused by biotite and accessory ilmenite and indicating the absence of magnetite. The contents of natural radioactive elements (average of 3 measurements) correspond to the usual contents for the following rocks: K = 3.1%, eU = 5.1 ppm, eTh = 12.6 ppm. | Žáček, Vladimír | 2021
Base information
Photo localization
WGS84:
49.1360484034,
13.7340057839
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Photo linksThemeChronostratigraphyRegional geologyRockGeological phenomenonSubjectLinked recordsImportant geological locality© Photo: Vladimír Žáček, 2021Autorská práva k tomuto snímku nevlastní Česká geologická služba. Cite of the archive photo No: 30993ŽÁČEK, V. (2021): Foto - Vacov - abandoned quarry.
In: Fotoarchiv České geologické služby [online databáze]. Praha, Česká geologická služba [cit. 2024-05-12].
Dostupné z URL http://www.geology.cz/foto/30993
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