Caves Indicating Neotectonic Activity in Sweden

Sjöberg, Rabbé

doi:10.1080/04353676.1986.11880189

Cited by 11 publications

(15 citation statements)

References 6 publications

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“…More convincing, field observations demonstrate that that the open “tectonic” caves known in parts of Swedish bedrock are still propped open by displaced fracture misfits and boulders. Such cobbles or boulders are too large to reach their present locations without the fractures having been wider when they entered [ Sjöberg , ; Talbot , ].…”

Section: The Maximum Depth?mentioning

confidence: 99%

Comment on “Approach to estimating the maximum depth for glacially induced hydraulic jacking in fractured crystalline rock at Forsmark, Sweden” by M. Lönnqvist and H. Hökmark

Talbot

2014

JGR Earth Surface

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Section: The Maximum Depth?mentioning

confidence: 99%

Comment on “Approach to estimating the maximum depth for glacially induced hydraulic jacking in fractured crystalline rock at Forsmark, Sweden” by M. Lönnqvist and H. Hökmark

Talbot

2014

JGR Earth Surface

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“…Waterstrat et al, 2010) nor they are spaces between fallen blocks (talus caves or boulder caves) (e.g. Sjöberg, 1987), cavities inside fault zones (crevice or structural caves) (e.g. Margielewski & Urban, 2003) or caves related to volcanic activity (lava tubes or lava caves) (e.g.…”

Section: Discussionmentioning

confidence: 99%

Underground chamber systems excavated by cenozoic ground sloths in the state of Rio Grande do Sul, Brazil

Frank¹,

Althaus²,

Dario³

et al. 2015

Rev. bras. paleontol.

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A regional survey of the caves of the state of Rio Grande do Sul, Brazil, listed hundreds of caves with varied origins. Among these, we identifi ed two large caves with special characteristics, one located in the city of Santa Cruz do Sul and the other in the municipality of Vale Real. Both evolve in an approximately horizontal plane, extend tens of meters into the interior of the respective elevations, and do not show any signs of present or past underground drainage. Concave surfaces on the walls stand out in their morphologies, which suggest that the caves originally constituted a system of ellipsoidal chambers, each chamber with original height of approximately 1.5 m and diameter between 3.5 and 7 m. The individual chambers were connected by relatively short tunnels.These chambers are best preserved in the cave of Santa Cruz do Sul; the cave of Vale Real appears to have been much disfi gured, both because of inorganic processes and anthropogenic action. The general characteristics of these two caves enable us to propose that they originated from the activity of digging ground sloths of the South American Megafauna. Their dimensions suggest that they were excavated and inhabited not by individual animals, but by groups of sloths. The original polished walls suggest that the caves were used for extended periods, possibly in the order of centuries. Their morphology is so different from other tunnel systems that were excavated by the Megafauna and found in southern Brazil, that we suggest that this morphology of chamber systems is associated with a specifi c species of ground sloth, whose identifi cation will be very diffi cult.

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“…Because Swedish geological mapping is divided into a solid rock branch and a Quaternary branch, caves and loose block heaps happened to fall in between those units, and therefore were largely ignored in the geological mapping. Instead, the study of Swedish block caves came to be driven by the spirit and curiosity of individual persons like Bergsten (1943), Agrell (1981Agrell ( , 1982, Isacsson (1982Isacsson ( , 1990, Sjöberg (1987a, 1994a.…”

Section: Fracture Caves and Block Cavesmentioning

confidence: 99%

“…Therefore, fractures and faults in this glaciated bedrock surface provide evidence of postglacial fracturing. This fracturing of previously solid bedrock must be understood in terms of seismotectonics (Mörner, 1978(Mörner, , 2003Sjöberg, 1987aSjöberg, , 1994a. Today, Sweden is a country of low to moderately-low seismic activity.…”

Section: Bedrock Fracturing Seismotectonics and Paleoseismologymentioning

confidence: 99%

Merging the concepts of pseudokarst and paleoseismicity in Sweden: A unified theory on the formation of fractures, fracture caves, and angular block heape

Mörner¹,

Sjöberg²

2018

IJS

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Sweden has thousands of caves cut into the bedrock, two thirds of which occur in the crystalline bedrock, and hence represent pseudokarst phenomena. The formation of these caves can only be understood in terms of paleoseismics. In this paper, we review the parallel evolution of the concept of pseudokarst caves and of the concept of paleoseismic activity in Sweden, and combine both concepts into a unified theory on the formation of fractures, fracture caves and angular block heaps. pseudokarst, fracture caves, block caves, paleoseismics, methane venting tectonics

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Caves Indicating Neotectonic Activity in Sweden

Cited by 11 publications

References 6 publications

Comment on “Approach to estimating the maximum depth for glacially induced hydraulic jacking in fractured crystalline rock at Forsmark, Sweden” by M. Lönnqvist and H. Hökmark

Comment on “Approach to estimating the maximum depth for glacially induced hydraulic jacking in fractured crystalline rock at Forsmark, Sweden” by M. Lönnqvist and H. Hökmark

Underground chamber systems excavated by cenozoic ground sloths in the state of Rio Grande do Sul, Brazil

Merging the concepts of pseudokarst and paleoseismicity in Sweden: A unified theory on the formation of fractures, fracture caves, and angular block heape

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