by neufer » Sat Jul 21, 2012 11:20 am
walfy wrote:
Perhaps there was a thick layer of ice under there at first, then the meteor punched through the soil and exposed it. The ice subsequently sublimated (evaporated), leaving the cavern below.
- But it is sitting on a VOLCANO
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
http://en.wikipedia.org/wiki/Lava_tube wrote:
<<Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow, expelled by a volcano during an eruption. They can be actively draining lava from a source, or can be extinct, meaning the lava flow has ceased and the rock has cooled and left a long, cave-like channel.
Scientific evidence suggests the moon has many lava tubes and one location in particular, the
Marius Hills, has been proposed as being suitable location for a human colony
Lava tubes are a type of lava cave formed when an active low-viscosity lava flow develops a continuous and hard crust, which thickens and forms a roof above the still-flowing lava stream. Tubes form in one of two ways: by the crusting over of lava channels, and from pahoehoe flows where the lava is moving under the surface. Lava usually leaves the point of eruption in channels. These channels tend to stay very hot as their surroundings cool. This means they slowly develop walls around them as the surrounding lava cools and/or as the channel melts its way deeper. These channels can get deep enough to crust over, forming an insulating tube that keeps the lava molten and serves as a conduit for the flowing lava. These types of lava tubes tend to be closer to the lava eruption point.
Further away from the eruption point, lava can flow in an unchanneled, fanlike manner as it leaves its source, which is usually another lava tube leading back to the eruption point. Called pahoehoe flows, these areas of surface-moving lava cool, forming either a smooth or rough, ropy surface. The lava continues to flow this way until it begins to block its source. At this point, the subsurface lava is still hot enough to break out at a point, and from this point the lava begins as a new "source". Lava flows from the previous source to this breakout point as the surrounding lava of the pahoehoe flow cools. This forms an underground channel that becomes a lava tube.
A broad lava-flow field often consists of a main lava tube and a series of smaller tubes that supply lava to the front of one or more separate flows. When the supply of lava stops at the end of an eruption or lava is diverted elsewhere, lava in the tube system drains downslope and leaves partially empty cave-like conduits beneath the ground.
Such drained tubes commonly exhibit step marks on their walls that mark the various depths at which the lava flowed, known as flow ledges or flow lines depending on how prominently they protrude from the walls. Lava tubes generally have pahoehoe floors, although this may often be covered in breakdown from the ceiling. A variety of speleothems may be found in lava tubes including a variety of stalactite forms generally known as lavacicles, which can be of the splash, shark tooth, or tubular variety. Lavacicles are the most common of lava tube speleothems. Drip stalagmites may form under tubular lava stalactites, and the latter may grade into a form known as a tubular lava helictite. A runner is a bead of lava that extrudes from a small opening and then runs down a wall. Lava tubes may also contain mineral deposits that most commonly take the form of crusts or small crystals, and less commonly, as stalactites and stalagmites.>>
[quote="walfy"]
Perhaps there was a thick layer of ice under there at first, then the meteor punched through the soil and exposed it. The ice subsequently sublimated (evaporated), leaving the cavern below.[/quote]
[list]But it is sitting on a VOLCANO :!: [/list]
[quote=" http://en.wikipedia.org/wiki/Lava_tube"]
[float=right][img3="[b][color=#0000FF]Close-up of a skylight on coastal plain, with lava stalactites forming
on the roof of the tube. Hawaii Volcanoes National Park.
Lava tubes can be up to 14–15 metres wide and run from 1–15 metres
below the surface. One lava tube from the Mauna Loa 1859 flow
enters the ocean about 50 kilometers from its eruption point.[/color][/b]"]http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Close-up_of_a_skylight_on_coastal_plain%2C_with_lava_stalactites_forming_on_the_roof_of_the_tube.jpg/640px-Close-up_of_a_skylight_on_coastal_plain%2C_with_lava_stalactites_forming_on_the_roof_of_the_tube.jpg[/img3][img3="[url=http://en.wikipedia.org/wiki/The_Gates_of_Hell][size=175]Rodin's La Porte de [s]Neufer[/s] l'Enfer[/size][/url]"]http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Z%C3%BCrich_-_Kunsthaus_-_Rodin%27s_H%C3%B6llentor_IMG_7384_ShiftN.jpg/683px-Z%C3%BCrich_-_Kunsthaus_-_Rodin%27s_H%C3%B6llentor_IMG_7384_ShiftN.jpg[/img3][/float]
<<Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow, expelled by a volcano during an eruption. They can be actively draining lava from a source, or can be extinct, meaning the lava flow has ceased and the rock has cooled and left a long, cave-like channel.
Scientific evidence suggests the moon has many lava tubes and one location in particular, the [url=http://en.wikipedia.org/wiki/Marius_Hills]Marius Hills[/url], has been proposed as being suitable location for a human colony
Lava tubes are a type of lava cave formed when an active low-viscosity lava flow develops a continuous and hard crust, which thickens and forms a roof above the still-flowing lava stream. Tubes form in one of two ways: by the crusting over of lava channels, and from pahoehoe flows where the lava is moving under the surface. Lava usually leaves the point of eruption in channels. These channels tend to stay very hot as their surroundings cool. This means they slowly develop walls around them as the surrounding lava cools and/or as the channel melts its way deeper. These channels can get deep enough to crust over, forming an insulating tube that keeps the lava molten and serves as a conduit for the flowing lava. These types of lava tubes tend to be closer to the lava eruption point.
Further away from the eruption point, lava can flow in an unchanneled, fanlike manner as it leaves its source, which is usually another lava tube leading back to the eruption point. Called pahoehoe flows, these areas of surface-moving lava cool, forming either a smooth or rough, ropy surface. The lava continues to flow this way until it begins to block its source. At this point, the subsurface lava is still hot enough to break out at a point, and from this point the lava begins as a new "source". Lava flows from the previous source to this breakout point as the surrounding lava of the pahoehoe flow cools. This forms an underground channel that becomes a lava tube.
A broad lava-flow field often consists of a main lava tube and a series of smaller tubes that supply lava to the front of one or more separate flows. When the supply of lava stops at the end of an eruption or lava is diverted elsewhere, lava in the tube system drains downslope and leaves partially empty cave-like conduits beneath the ground.
Such drained tubes commonly exhibit step marks on their walls that mark the various depths at which the lava flowed, known as flow ledges or flow lines depending on how prominently they protrude from the walls. Lava tubes generally have pahoehoe floors, although this may often be covered in breakdown from the ceiling. A variety of speleothems may be found in lava tubes including a variety of stalactite forms generally known as lavacicles, which can be of the splash, shark tooth, or tubular variety. Lavacicles are the most common of lava tube speleothems. Drip stalagmites may form under tubular lava stalactites, and the latter may grade into a form known as a tubular lava helictite. A runner is a bead of lava that extrudes from a small opening and then runs down a wall. Lava tubes may also contain mineral deposits that most commonly take the form of crusts or small crystals, and less commonly, as stalactites and stalagmites.>>[/quote]